| Abies amabilis | Douglas ex J.Forbes | Pinaceae | 8 |
| Abies bracteata | (D.Don) Poit. | Pinaceae | 8 |
| Abies concolor | (Gordon) Lindl. ex Hildebr. | Pinaceae | 8 |
| Abies grandis | (Douglas ex D.Don) Lindl. | Pinaceae | 8 |
| Abies lasiocarpa | (Hook.) Nutt. | Pinaceae | 8 |
| Abies magnifica | A.Murray bis | Pinaceae | 8 |
| Abies procera | Rehder | Pinaceae | 8 |
| Abronia crux-maltae | Kellogg | Nyctaginaceae | 8 |
| Abronia gracilis | Benth. | Nyctaginaceae | 8 |
| Abronia latifolia | Eschsch. | Nyctaginaceae | 8 |
| Abronia maritima | Nutt. ex S.Watson | Nyctaginaceae | 8 |
| Abronia micrantha | Torr. | Nyctaginaceae | 8 |
| Abronia nana | S.Watson | Nyctaginaceae | 8 |
| Abronia pogonantha | Heimerl | Nyctaginaceae | 8 |
| Abronia turbinata | Torr. ex S.Watson | Nyctaginaceae | 8 |
| Abronia umbellata | Lam. | Nyctaginaceae | 8 |
| Abronia villosa | S.Watson | Nyctaginaceae | 8 |
| Abutilon palmeri | A.Gray | Malvaceae | 8 |
| Abutilon parvulum | A.Gray | Malvaceae | 8 |
| Acaciella angustissima | (Mill.) Britton & Rose | Fabaceae | 8 |
| Acaena pinnatifida | Ruiz & Pav. | Rosaceae | 8 |
| Acalypha californica | Benth. | Euphorbiaceae | 8 |
| Acamptopappus shockleyi | A.Gray | Asteraceae | 8 |
| Acamptopappus sphaerocephalus | A.Gray | Asteraceae | 8 |
| Acanthomintha ilicifolia | A.Gray | Lamiaceae | 8 |
| Acanthomintha lanceolata | Curran | Lamiaceae | 8 |
| Acer circinatum | Pursh | Sapindaceae | 8 |
| Acer glabrum | Torr. | Sapindaceae | 8 |
| Acer macrophyllum | Pursh | Sapindaceae | 8 |
| Acer negundo | L. | Sapindaceae | 8 |
| Achillea millefolium | L. | Asteraceae | 8 |
| Achlys californica | Fukuda & H.Baker | Berberidaceae | 8 |
| Achlys triphylla | DC. | Berberidaceae | 8 |
| Achyrachaena mollis | Schauer | Asteraceae | 8 |
| Achyronychia cooperi | A.Gray | Caryophyllaceae | 8 |
| Acleisanthes longiflora | A.Gray | Nyctaginaceae | 8 |
| Acleisanthes nevadensis | (Standl.) B.L.Turner | Nyctaginaceae | 8 |
| Acmispon americanus | (Nutt.) Rydb. | Fabaceae | 8 |
| Acmispon argophyllus | (A.Gray) Brouillet | Fabaceae | 8 |
| Acmispon brachycarpus | (Benth.) D.D.Sokoloff | Fabaceae | 8 |
| Acmispon cytisoides | (Benth.) Brouillet | Fabaceae | 8 |
| Acmispon decumbens | (Benth.) Govaerts | Fabaceae | 8 |
| Acmispon dendroideus | (Greene) Brouillet | Fabaceae | 8 |
| Acmispon glaber | (Vogel) Brouillet | Fabaceae | 8 |
| Acmispon grandiflorus | (Benth.) Brouillet | Fabaceae | 8 |
| Acmispon junceus | (Benth.) Brouillet | Fabaceae | 8 |
| Acmispon maritimus | (Nutt.) D.D.Sokoloff | Fabaceae | 8 |
| Acmispon micranthus | (Nutt. ex Torr. & A.Gray) Brouillet | Fabaceae | 8 |
| Acmispon niveus | (S.Watson) Brouillet | Fabaceae | 8 |
| Acmispon parviflorus | (Benth.) D.D.Sokoloff | Fabaceae | 8 |
| Acmispon prostratus | (Nutt.) Brouillet | Fabaceae | 8 |
| Acmispon rigidus | (Benth.) Brouillet | Fabaceae | 8 |
| Acmispon strigosus | (Nutt.) Brouillet | Fabaceae | 8 |
| Acmispon tomentosus | (Hook. & Arn.) Govaerts | Fabaceae | 8 |
| Acmispon wrangelianus | (Fisch. & C.A.Mey.) Sokoloff | Fabaceae | 8 |
| Aconitum columbianum | Nutt. | Ranunculaceae | 8 |
| Acourtia microcephala | DC. | Asteraceae | 8 |
| Actaea rubra | (Aiton) Willd. | Ranunculaceae | 8 |
| Adelinia grandis | (Douglas ex Lehm.) J.I.Cohen | Boraginaceae | 8 |
| Adenocaulon bicolor | Hook. | Asteraceae | 8 |
| Adenophyllum cooperi | (A.Gray) Strother | Asteraceae | 8 |
| Adenophyllum porophylloides | (A.Gray) Strother | Asteraceae | 8 |
| Adenostoma fasciculatum | Hook. & Arn. | Rosaceae | 8 |
| Adenostoma sparsifolium | Torr. | Rosaceae | 8 |
| Adiantum aleuticum | (Rupr.) C.A.Paris | Pteridaceae | 8 |
| Adiantum capillus-veneris | L. | Pteridaceae | 8 |
| Adiantum jordanii | C.H.Mull. | Pteridaceae | 8 |
| Adiantum shastense | Huiet & A.R.Sm. | Pteridaceae | 8 |
| Adiaphila brickellioides | (S.F.Blake) G.L.Nesom | Asteraceae | 8 |
| Adolphia californica | S.Watson | Rhamnaceae | 8 |
| Aesculus californica | (Spach) Nutt. | Sapindaceae | 8 |
| Agastache parvifolia | Eastw. | Lamiaceae | 8 |
| Agastache urticifolia | (Benth.) Kuntze | Lamiaceae | 8 |
| Agave deserti | Engelm. | Asparagaceae | 8 |
| Agave shawii | Engelm. | Asparagaceae | 8 |
| Agave utahensis | Engelm. | Asparagaceae | 8 |
| Ageratina herbacea | (A.Gray) R.M.King & H.Rob. | Asteraceae | 8 |
| Ageratina occidentalis | (Hook.) R.M.King & H.Rob. | Asteraceae | 8 |
| Ageratina shastensis | (D.W.Taylor & Stebbins) R.M.King & H.Rob. | Asteraceae | 8 |
| Agnorhiza bolanderi | (A.Gray) W.A.Weber | Asteraceae | 8 |
| Agnorhiza elata | (H.M.Hall) W.A.Weber | Asteraceae | 8 |
| Agoseris apargioides | (Less.) Greene | Asteraceae | 8 |
| Agoseris aurantiaca | (Hook.) Greene | Asteraceae | 8 |
| Agoseris glauca | (Pursh) Raf. | Asteraceae | 8 |
| Agoseris grandiflora | (Nutt.) Greene | Asteraceae | 8 |
| Agoseris heterophylla | (Nutt.) Greene | Asteraceae | 8 |
| Agoseris hirsuta | (Hook.) Greene | Asteraceae | 8 |
| Agoseris retrorsa | Greene | Asteraceae | 8 |
| Agrimonia gryposepala | Wallr. | Rosaceae | 8 |
| Agrimonia striata | Michx. | Rosaceae | 8 |
| Agrostis pallens | Trin. | Poaceae | 8 |
| Agrostis perennans | (Walter) Tuck. | Poaceae | 8 |
| Agrostis scabra | Willd. | Poaceae | 8 |
| Alchemilla occidentalis | Nutt. | Rosaceae | 8 |
| Aliciella hutchinsifolia | (Rydb.) J.M.Porter | Polemoniaceae | 8 |
| Aliciella latifolia | (S.Watson) J.M.Porter | Polemoniaceae | 8 |
| Aliciella leptomeria | (A.Gray) J.M.Porter | Polemoniaceae | 8 |
| Aliciella lottiae | (A.G.Day) J.M.Porter | Polemoniaceae | 8 |
| Aliciella monoensis | J.M.Porter & A.G.Day | Polemoniaceae | 8 |
| Aliciella ripleyi | (Barneby) J.M.Porter | Polemoniaceae | 8 |
| Aliciella triodon | (Eastw.) Brand | Polemoniaceae | 8 |
| Alisma gramineum | Lej. | Alismataceae | 8 |
| Alisma triviale | Pursh | Alismataceae | 8 |
| Allenrolfea occidentalis | (S.Watson) Kuntze | Chenopodiaceae | 8 |
| Allionia incarnata | L. | Nyctaginaceae | 8 |
| Allium abramsii | (Traub) McNeal | Amaryllidaceae | 8 |
| Allium acuminatum | Hook. | Amaryllidaceae | 8 |
| Allium amplectens | Torr. | Amaryllidaceae | 8 |
| Allium anceps | Kellogg | Amaryllidaceae | 8 |
| Allium bisceptrum | S.Watson | Amaryllidaceae | 8 |
| Allium bolanderi | S.Watson | Amaryllidaceae | 8 |
| Allium burlewii | Davidson | Amaryllidaceae | 8 |
| Allium campanulatum | S.Watson | Amaryllidaceae | 8 |
| Allium cratericola | Eastw. | Amaryllidaceae | 8 |
| Allium crispum | Greene | Amaryllidaceae | 8 |
| Allium diabolense | (Ownbey & Aase ex Traub) McNeal | Amaryllidaceae | 8 |
| Allium dichlamydeum | Greene | Amaryllidaceae | 8 |
| Allium falcifolium | Hook. & Arn. | Amaryllidaceae | 8 |
| Allium fimbriatum | S.Watson | Amaryllidaceae | 8 |
| Allium haematochiton | S.Watson | Amaryllidaceae | 8 |
| Allium hickmanii | Eastw. | Amaryllidaceae | 8 |
| Allium hoffmanii | Ownbey ex Traub | Amaryllidaceae | 8 |
| Allium howellii | Eastw. | Amaryllidaceae | 8 |
| Allium hyalinum | Curran | Amaryllidaceae | 8 |
| Allium lacunosum | S.Watson | Amaryllidaceae | 8 |
| Allium lemmonii | S.Watson | Amaryllidaceae | 8 |
| Allium monticola | Davidson | Amaryllidaceae | 8 |
| Allium nevadense | S.Watson | Amaryllidaceae | 8 |
| Allium obtusum | Lemmon | Amaryllidaceae | 8 |
| Allium parryi | S.Watson | Amaryllidaceae | 8 |
| Allium parvum | Kellogg | Amaryllidaceae | 8 |
| Allium peninsulare | Lemmon ex Greene | Amaryllidaceae | 8 |
| Allium platycaule | S.Watson | Amaryllidaceae | 8 |
| Allium praecox | Brandegee | Amaryllidaceae | 8 |
| Allium serra | McNeal & Ownbey | Amaryllidaceae | 8 |
| Allium shevockii | McNeal | Amaryllidaceae | 8 |
| Allium siskiyouense | Ownbey ex Traub | Amaryllidaceae | 8 |
| Allium unifolium | Kellogg | Amaryllidaceae | 8 |
| Allium validum | S.Watson | Amaryllidaceae | 8 |
| Allophyllum divaricatum | (Nutt.) A.D.Grant & V.E.Grant | Polemoniaceae | 8 |
| Allophyllum gilioides | (Benth.) A.D.Grant & V.E.Grant | Polemoniaceae | 8 |
| Allophyllum glutinosum | (Benth.) A.D.Grant & V.E.Grant | Polemoniaceae | 8 |
| Allophyllum integrifolium | (Brand) A.D.Grant & V.E.Grant | Polemoniaceae | 8 |
| Allotropa virgata | Torr. & A.Gray | Ericaceae | 8 |
| Alnus alnobetula | (Ehrh.) K.Koch | Betulaceae | 8 |
| Alnus incana | (L.) Moench | Betulaceae | 8 |
| Alnus rhombifolia | Nutt. | Betulaceae | 8 |
| Alnus rubra | Bong. | Betulaceae | 8 |
| Alopecurus aequalis | Sobol. | Poaceae | 8 |
| Alopecurus carolinianus | Walter | Poaceae | 8 |
| Alopecurus magellanicus | Lam. | Poaceae | 8 |
| Alopecurus saccatus | Vasey | Poaceae | 8 |
| Aloysia wrightii | A.Heller | Verbenaceae | 8 |
| Amaranthus albus | L. | Amaranthaceae | 8 |
| Amaranthus fimbriatus | (Torr.) Benth. ex S.Watson | Amaranthaceae | 8 |
| Amaranthus palmeri | S.Watson | Amaranthaceae | 8 |
| Amaranthus powellii | S.Watson | Amaranthaceae | 8 |
| Amaranthus watsonii | Standl. | Amaranthaceae | 8 |
| Amauropelta nevadensis | (Baker) S.E.Fawc. & A.R.Sm. | Thelypteridaceae | 8 |
| Amblyopappus pusillus | Hook. & Arn. | Asteraceae | 8 |
| Ambrosia acanthicarpa | Hook. | Asteraceae | 8 |
| Ambrosia ambrosioides | (Delpino) W.W.Payne | Asteraceae | 8 |
| Ambrosia artemisiifolia | L. | Asteraceae | 8 |
| Ambrosia chamissonis | Greene | Asteraceae | 8 |
| Ambrosia chenopodiifolia | (Benth.) W.W.Payne | Asteraceae | 8 |
| Ambrosia confertiflora | DC. | Asteraceae | 8 |
| Ambrosia dumosa | (A.Gray) W.W.Payne | Asteraceae | 8 |
| Ambrosia eriocentra | (A.Gray) W.W.Payne | Asteraceae | 8 |
| Ambrosia ilicifolia | (A.Gray) W.W.Payne | Asteraceae | 8 |
| Ambrosia psilostachya | DC. | Asteraceae | 8 |
| Ambrosia pumila | (Nutt.) A.Gray | Asteraceae | 8 |
| Ambrosia trifida | L. | Asteraceae | 8 |
| Amelanchier alnifolia | (Nutt.) Nutt. ex M.Roem. | Rosaceae | 8 |
| Amelanchier cusickii | Fernald | Rosaceae | 8 |
| Amelanchier utahensis | Koehne | Rosaceae | 8 |
| Ammannia coccinea | Rottb. | Lythraceae | 8 |
| Ammannia robusta | Heer & Regel | Lythraceae | 8 |
| Amorpha californica | Nutt. | Fabaceae | 8 |
| Amorpha fruticosa | L. | Fabaceae | 8 |
| Amphipappus fremontii | Torr. & A.Gray | Asteraceae | 8 |
| Amphiscirpus nevadensis | (S.Watson) Oteng-Yeb. | Cyperaceae | 8 |
| Amsinckia douglasiana | A.DC. | Boraginaceae | 8 |
| Amsinckia eastwoodiae | J.F.Macbr. | Boraginaceae | 8 |
| Amsinckia lunaris | J.F.Macbr. | Boraginaceae | 8 |
| Amsinckia lycopsoides | Lindl. ex Lehm. | Boraginaceae | 8 |
| Amsinckia menziesii | (Lehm.) A.Nelson & J.F.Macbr. | Boraginaceae | 8 |
| Amsinckia spectabilis | Fisch. & C.A.Mey. | Boraginaceae | 8 |
| Amsinckia tessellata | A.Gray | Boraginaceae | 8 |
| Amsinckia vernicosa | Hook. & Arn. | Boraginaceae | 8 |
| Amsonia tomentosa | Torr. & Frém. | Apocynaceae | 8 |
| Anaphalis margaritacea | (L.) Benth. & Hook.f. | Asteraceae | 8 |
| Ancistrocarphus filagineus | A.Gray | Asteraceae | 8 |
| Andersonglossum occidentale | (A.Gray) J.I.Cohen | Boraginaceae | 8 |
| Andropogon cirratus | Hack. | Poaceae | 8 |
| Androsace elongata | L. | Primulaceae | 8 |
| Androsace filiformis | Retz. | Primulaceae | 8 |
| Androsace occidentalis | Pursh | Primulaceae | 8 |
| Androsace septentrionalis | L. | Primulaceae | 8 |
| Androstephium breviflorum | S.Watson | Asparagaceae | 8 |
| Anelsonia eurycarpa | (A.Gray) J.F.Macbr. & Payson | Brassicaceae | 8 |
| Anemonastrum deltoideum | (Hook.) Mosyakin | Ranunculaceae | 8 |
| Anemone drummondii | S.Watson | Ranunculaceae | 8 |
| Anemone multifida | Poir. | Ranunculaceae | 8 |
| Anemone tuberosa | Rydb. | Ranunculaceae | 8 |
| Anemonoides grayi | (Behr. & Kellogg) Starod. | Ranunculaceae | 8 |
| Anemopsis californica | (Nutt.) Hook. & Arn. | Saururaceae | 8 |
| Angelica arguta | Nutt. | Apiaceae | 8 |
| Angelica breweri | A.Gray | Apiaceae | 8 |
| Angelica californica | Jeps. | Apiaceae | 8 |
| Angelica capitellata | (A.Gray) Spalik, Reduron & S.R.Downie | Apiaceae | 8 |
| Angelica genuflexa | Nutt. | Apiaceae | 8 |
| Angelica hendersonii | J.M.Coult. & Rose | Apiaceae | 8 |
| Angelica kingii | (S.Watson) J.M.Coult. & Rose | Apiaceae | 8 |
| Angelica lineariloba | A.Gray | Apiaceae | 8 |
| Angelica lucida | L. | Apiaceae | 8 |
| Angelica tomentosa | S.Watson | Apiaceae | 8 |
| Anisocarpus madioides | Nutt. | Asteraceae | 8 |
| Anisocarpus scabridus | (Eastw.) B.G.Baldwin | Asteraceae | 8 |
| Anisocoma acaulis | Torr. & A.Gray | Asteraceae | 8 |
| Antennaria argentea | Benth. | Asteraceae | 8 |
| Antennaria dimorpha | Torr. & A.Gray | Asteraceae | 8 |
| Antennaria geyeri | A.Gray | Asteraceae | 8 |
| Antennaria howellii | Greene | Asteraceae | 8 |
| Antennaria lanata | Greene | Asteraceae | 8 |
| Antennaria luzuloides | Torr. & A.Gray | Asteraceae | 8 |
| Antennaria marginata | Greene | Asteraceae | 8 |
| Antennaria media | Greene | Asteraceae | 8 |
| Antennaria microphylla | Rydb. | Asteraceae | 8 |
| Antennaria pulchella | Greene | Asteraceae | 8 |
| Antennaria racemosa | Hook. | Asteraceae | 8 |
| Antennaria rosea | Greene | Asteraceae | 8 |
| Antennaria umbrinella | Rydb. | Asteraceae | 8 |
| Anthoxanthum nitens | (Weber) Y.Schouten & Veldkamp | Poaceae | 8 |
| Anthoxanthum occidentale | (Buckley) Veldkamp | Poaceae | 8 |
| Anticlea occidentalis | (A.Gray) Zomlefer & Judd | Melanthiaceae | 8 |
| Anulocaulis annulatus | (Coville) Standl. | Nyctaginaceae | 8 |
| Aphanisma blitoides | Nutt. ex Moq. | Chenopodiaceae | 8 |
| Apiastrum angustifolium | Nutt. | Apiaceae | 8 |
| Apocynum androsaemifolium | L. | Apocynaceae | 8 |
| Apocynum cannabinum | L. | Apocynaceae | 8 |
| Aquilegia eximia | Van Houtte ex Planch. | Ranunculaceae | 8 |
| Aquilegia formosa | Fisch. ex DC. | Ranunculaceae | 8 |
| Aquilegia pubescens | Coville | Ranunculaceae | 8 |
| Aquilegia shockleyi | Eastw. | Ranunculaceae | 8 |
| Arabis blepharophylla | Hook. & Arn. | Brassicaceae | 8 |
| Arabis eschscholtziana | Andrz. ex Ledeb. | Brassicaceae | 8 |
| Aralia californica | S.Watson | Araliaceae | 8 |
| Arbutus menziesii | Pursh | Ericaceae | 8 |
| Arceuthobium americanum | Nutt. ex Engelm. | Santalaceae | 8 |
| Arceuthobium campylopodum | Engelm. | Santalaceae | 8 |
| Arceuthobium divaricatum | Engelm. | Santalaceae | 8 |
| Arceuthobium douglasii | Engelm. | Santalaceae | 8 |
| Arceuthobium littorum | Hawksw., Wiens & Nickrent | Santalaceae | 8 |
| Arceuthobium siskiyouense | Hawksw., Wiens & Nickrent | Santalaceae | 8 |
| Arctomecon merriamii | Coville | Papaveraceae | 8 |
| Arctostaphylos andersonii | A.Gray | Ericaceae | 8 |
| Arctostaphylos auriculata | Eastw. | Ericaceae | 8 |
| Arctostaphylos canescens | Eastw. | Ericaceae | 8 |
| Arctostaphylos catalinae | P.V.Wells | Ericaceae | 8 |
| Arctostaphylos columbiana | Piper | Ericaceae | 8 |
| Arctostaphylos crustacea | Eastw. | Ericaceae | 8 |
| Arctostaphylos cruzensis | Roof | Ericaceae | 8 |
| Arctostaphylos densiflora | M.S.Baker | Ericaceae | 8 |
| Arctostaphylos edmundsii | J.T.Howell | Ericaceae | 8 |
| Arctostaphylos gabilanensis | V.T.Parker & M.C.Vasey | Ericaceae | 8 |
| Arctostaphylos glandulosa | Eastw. | Ericaceae | 8 |
| Arctostaphylos glauca | Lindl. | Ericaceae | 8 |
| Arctostaphylos glutinosa | B.Schreib. | Ericaceae | 8 |
| Arctostaphylos hispidula | Howell | Ericaceae | 8 |
| Arctostaphylos hookeri | G.Don | Ericaceae | 8 |
| Arctostaphylos hooveri | P.V.Wells | Ericaceae | 8 |
| Arctostaphylos imbricata | Eastw. | Ericaceae | 8 |
| Arctostaphylos insularis | Greene & Parry | Ericaceae | 8 |
| Arctostaphylos luciana | P.V.Wells | Ericaceae | 8 |
| Arctostaphylos manzanita | Parry | Ericaceae | 8 |
| Arctostaphylos mewukka | Merriam | Ericaceae | 8 |
| Arctostaphylos montaraensis | Roof | Ericaceae | 8 |
| Arctostaphylos montereyensis | Hoover | Ericaceae | 8 |
| Arctostaphylos morroensis | Wiesl. & B.Schreib. | Ericaceae | 8 |
| Arctostaphylos myrtifolia | Parry | Ericaceae | 8 |
| Arctostaphylos nevadensis | A.Gray | Ericaceae | 8 |
| Arctostaphylos nipumu | Abbo, Stickrod, A.Krohn, V.T.Parker, M.C.Vasey, W.Waycott & Litt | Ericaceae | 8 |
| Arctostaphylos nissenana | Merriam | Ericaceae | 8 |
| Arctostaphylos nortensis | (P.V.Wells) P.V.Wells | Ericaceae | 8 |
| Arctostaphylos nummularia | A.Gray | Ericaceae | 8 |
| Arctostaphylos obispoensis | Eastw. | Ericaceae | 8 |
| Arctostaphylos osoensis | P.V.Wells | Ericaceae | 8 |
| Arctostaphylos otayensis | Wiesl. & B.Schreib. | Ericaceae | 8 |
| Arctostaphylos pacifica | Roof | Ericaceae | 8 |
| Arctostaphylos pajaroensis | J.E.Adams | Ericaceae | 8 |
| Arctostaphylos pallida | Eastw. | Ericaceae | 8 |
| Arctostaphylos parryana | Lemmon | Ericaceae | 8 |
| Arctostaphylos patula | Greene | Ericaceae | 8 |
| Arctostaphylos pechoensis | Dudley ex Abrams | Ericaceae | 8 |
| Arctostaphylos pilosula | Jeps. & Wiesl. | Ericaceae | 8 |
| Arctostaphylos pringlei | Parry | Ericaceae | 8 |
| Arctostaphylos pumila | Nutt. | Ericaceae | 8 |
| Arctostaphylos pungens | Kunth | Ericaceae | 8 |
| Arctostaphylos purissima | P.V.Wells | Ericaceae | 8 |
| Arctostaphylos rainbowensis | J.E.Keeley & Massihi | Ericaceae | 8 |
| Arctostaphylos refugioensis | Gankin | Ericaceae | 8 |
| Arctostaphylos regismontana | Eastw. | Ericaceae | 8 |
| Arctostaphylos rudis | Jeps. & Wiesl. | Ericaceae | 8 |
| Arctostaphylos sensitiva | Jeps. | Ericaceae | 8 |
| Arctostaphylos silvicola | Jeps. & Wiesl. | Ericaceae | 8 |
| Arctostaphylos tomentosa | (Pursh) Lindl. | Ericaceae | 8 |
| Arctostaphylos uva-ursi | (L.) Spreng. | Ericaceae | 8 |
| Arctostaphylos virgata | Eastw. | Ericaceae | 8 |
| Arctostaphylos viscida | Parry | Ericaceae | 8 |
| Arenaria lanuginosa | (Michx.) Rohrb. | Caryophyllaceae | 8 |
| Arenaria paludicola | B.L.Rob. | Caryophyllaceae | 8 |
| Argemone corymbosa | Greene | Papaveraceae | 8 |
| Argemone munita | Durand & Hilg. | Papaveraceae | 8 |
| Argentina anserina | (L.) Rydb. | Rosaceae | 8 |
| Argentina pacifica | (Howell) Rydb. | Rosaceae | 8 |
| Argyrochosma jonesii | (Maxon) Windham | Pteridaceae | 8 |
| Argyrochosma limitanea | (Maxon) Windham | Pteridaceae | 8 |
| Aristida adscensionis | L. | Poaceae | 8 |
| Aristida divaricata | Humb. & Bonpl. ex Willd. | Poaceae | 8 |
| Aristida oligantha | Michx. | Poaceae | 8 |
| Aristida purpurea | Nutt. | Poaceae | 8 |
| Aristolochia californica | Torr. | Aristolochiaceae | 8 |
| Armeria maritima | (Mill.) Willd. | Plumbaginaceae | 8 |
| Arnica cernua | Howell | Asteraceae | 8 |
| Arnica chamissonis | Less. | Asteraceae | 8 |
| Arnica cordifolia | Hook. | Asteraceae | 8 |
| Arnica discoidea | Benth. | Asteraceae | 8 |
| Arnica fulgens | Pursh | Asteraceae | 8 |
| Arnica lanceolata | Nutt. | Asteraceae | 8 |
| Arnica latifolia | Bong. | Asteraceae | 8 |
| Arnica longifolia | D.C.Eaton | Asteraceae | 8 |
| Arnica mollis | Hook. | Asteraceae | 8 |
| Arnica parryi | A.Gray | Asteraceae | 8 |
| Arnica sororia | Greene | Asteraceae | 8 |
| Arnica spathulata | Greene | Asteraceae | 8 |
| Arnica venosa | H.M.Hall | Asteraceae | 8 |
| Arnica viscosa | A.Gray | Asteraceae | 8 |
| Artemisia albicans | Sòn.Garcia, Garnatje, McArthur, Pellicer, S.C.Sand. & Vallès-Xirau | Asteraceae | 8 |
| Artemisia arbuscula | Nutt. | Asteraceae | 8 |
| Artemisia biennis | Willd. | Asteraceae | 8 |
| Artemisia bigelovii | A.Gray | Asteraceae | 8 |
| Artemisia californica | Less. | Asteraceae | 8 |
| Artemisia campestris | L. | Asteraceae | 8 |
| Artemisia cana | Pursh | Asteraceae | 8 |
| Artemisia douglasiana | Besser | Asteraceae | 8 |
| Artemisia dracunculus | L. | Asteraceae | 8 |
| Artemisia ludoviciana | Nutt. | Asteraceae | 8 |
| Artemisia michauxiana | Besser | Asteraceae | 8 |
| Artemisia nesiotica | P.H.Raven | Asteraceae | 8 |
| Artemisia norvegica | Fr. | Asteraceae | 8 |
| Artemisia nova | A.Nelson | Asteraceae | 8 |
| Artemisia palmeri | A.Gray | Asteraceae | 8 |
| Artemisia pycnocephala | DC. | Asteraceae | 8 |
| Artemisia spiciformis | Osterh. | Asteraceae | 8 |
| Artemisia suksdorfii | Piper | Asteraceae | 8 |
| Artemisia tridentata | Nutt. | Asteraceae | 8 |
| Aruncus dioicus | (Walter) Fernald | Rosaceae | 8 |
| Asarum caudatum | Lindl. | Aristolochiaceae | 8 |
| Asarum hartwegii | S.Watson | Aristolochiaceae | 8 |
| Asarum lemmonii | S.Watson | Aristolochiaceae | 8 |
| Asarum marmoratum | Piper | Aristolochiaceae | 8 |
| Asclepias albicans | S.Watson | Apocynaceae | 8 |
| Asclepias asperula | (Decne.) Woodson | Apocynaceae | 8 |
| Asclepias californica | Greene | Apocynaceae | 8 |
| Asclepias cordifolia | (Benth.) Jeps. | Apocynaceae | 8 |
| Asclepias cryptoceras | S.Watson | Apocynaceae | 8 |
| Asclepias eriocarpa | Benth. | Apocynaceae | 8 |
| Asclepias erosa | Torr. | Apocynaceae | 8 |
| Asclepias fascicularis | Decne. | Apocynaceae | 8 |
| Asclepias nyctaginifolia | A.Gray | Apocynaceae | 8 |
| Asclepias solanoana | Woodson | Apocynaceae | 8 |
| Asclepias speciosa | Torr. | Apocynaceae | 8 |
| Asclepias subulata | Decne. | Apocynaceae | 8 |
| Asclepias vestita | Hook. & Arn. | Apocynaceae | 8 |
| Askellia pygmaea | (Ledeb.) Sennikov | Asteraceae | 8 |
| Aspidotis californica | (Hook.) Nutt. ex Copel. | Pteridaceae | 8 |
| Aspidotis carlotta-halliae | (W.H.Wagner & E.F.Gilbert) Lellinger | Pteridaceae | 8 |
| Aspidotis densa | (Brack.) Lellinger | Pteridaceae | 8 |
| Asplenium septentrionale | (L.) Hoffm. | Aspleniaceae | 8 |
| Asplenium trichomanes | L. | Aspleniaceae | 8 |
| Asplenium vespertinum | Maxon | Aspleniaceae | 8 |
| Asplenium viride | Huds. | Aspleniaceae | 8 |
| Astragalus acutirostris | S.Watson | Fabaceae | 8 |
| Astragalus agrestis | Douglas ex G.Don | Fabaceae | 8 |
| Astragalus andersonii | A.Gray | Fabaceae | 8 |
| Astragalus aridus | A.Gray | Fabaceae | 8 |
| Astragalus asymmetricus | E.Sheld. | Fabaceae | 8 |
| Astragalus atratus | S.Watson | Fabaceae | 8 |
| Astragalus austiniae | A.Gray ex W.H.Brewer & S.Watson | Fabaceae | 8 |
| Astragalus bolanderi | A.Gray | Fabaceae | 8 |
| Astragalus brauntonii | Parish | Fabaceae | 8 |
| Astragalus breweri | A.Gray | Fabaceae | 8 |
| Astragalus californicus | (A.Gray) Greene | Fabaceae | 8 |
| Astragalus calycosus | Torr. ex S.Watson | Fabaceae | 8 |
| Astragalus canadensis | L. | Fabaceae | 8 |
| Astragalus casei | A.Gray | Fabaceae | 8 |
| Astragalus coccineus | (Parry) Brandegee | Fabaceae | 8 |
| Astragalus congdonii | S.Watson | Fabaceae | 8 |
| Astragalus crotalariae | (Benth.) A.Gray | Fabaceae | 8 |
| Astragalus curtipes | A.Gray | Fabaceae | 8 |
| Astragalus curvicarpus | (E.Sheld.) J.F.Macbr. | Fabaceae | 8 |
| Astragalus deanei | (Rydb.) Barneby | Fabaceae | 8 |
| Astragalus didymocarpus | Hook. & Arn. | Fabaceae | 8 |
| Astragalus douglasii | (Torr. & A.Gray) A.Gray | Fabaceae | 8 |
| Astragalus filipes | Torr. ex A.Gray | Fabaceae | 8 |
| Astragalus gambelianus | E.Sheld. | Fabaceae | 8 |
| Astragalus gibbsii | Kellogg | Fabaceae | 8 |
| Astragalus gilmanii | Tidestr. | Fabaceae | 8 |
| Astragalus inyoensis | E.Sheld. | Fabaceae | 8 |
| Astragalus iodanthus | S.Watson | Fabaceae | 8 |
| Astragalus johannis-howellii | Barneby | Fabaceae | 8 |
| Astragalus kentrophyta | A.Gray | Fabaceae | 8 |
| Astragalus layneae | Greene | Fabaceae | 8 |
| Astragalus lemmonii | A.Gray | Fabaceae | 8 |
| Astragalus lentiginosus | Douglas ex Hook. | Fabaceae | 8 |
| Astragalus leucolobus | Parry ex M.E.Jones | Fabaceae | 8 |
| Astragalus magdalenae | Greene | Fabaceae | 8 |
| Astragalus malacus | A.Gray | Fabaceae | 8 |
| Astragalus miguelensis | Greene | Fabaceae | 8 |
| Astragalus minthorniae | (Rydb.) Jeps. | Fabaceae | 8 |
| Astragalus mohavensis | S.Watson | Fabaceae | 8 |
| Astragalus monoensis | Barneby | Fabaceae | 8 |
| Astragalus nevinii | A.Gray ex Lyon | Fabaceae | 8 |
| Astragalus newberryi | A.Gray | Fabaceae | 8 |
| Astragalus nuttallianus | DC. | Fabaceae | 8 |
| Astragalus nuttallii | (Torr. & A.Gray) J.T.Howell | Fabaceae | 8 |
| Astragalus obscurus | S.Watson | Fabaceae | 8 |
| Astragalus oocarpus | A.Gray | Fabaceae | 8 |
| Astragalus oophorus | S.Watson | Fabaceae | 8 |
| Astragalus oxyphysus | A.Gray | Fabaceae | 8 |
| Astragalus pachypus | Greene | Fabaceae | 8 |
| Astragalus palmeri | A.Gray | Fabaceae | 8 |
| Astragalus panamintensis | E.Sheld. ex Coult. | Fabaceae | 8 |
| Astragalus platytropis | A.Gray | Fabaceae | 8 |
| Astragalus pomonensis | M.E.Jones | Fabaceae | 8 |
| Astragalus preussii | A.Gray | Fabaceae | 8 |
| Astragalus purshii | Douglas ex G.Don | Fabaceae | 8 |
| Astragalus pycnostachyus | A.Gray | Fabaceae | 8 |
| Astragalus ravenii | Barneby | Fabaceae | 8 |
| Astragalus sabulonum | A.Gray | Fabaceae | 8 |
| Astragalus sepultipes | (Barneby) Barneby | Fabaceae | 8 |
| Astragalus serenoi | (Kuntze) E.Sheld. | Fabaceae | 8 |
| Astragalus tener | A.Gray | Fabaceae | 8 |
| Astragalus tephrodes | A.Gray | Fabaceae | 8 |
| Astragalus tidestromii | (Rydb.) Clokey | Fabaceae | 8 |
| Astragalus traskiae | Eastw. | Fabaceae | 8 |
| Astragalus tricarinatus | A.Gray | Fabaceae | 8 |
| Astragalus trichopodus | (Nutt.) A.Gray | Fabaceae | 8 |
| Astragalus webberi | A.Gray | Fabaceae | 8 |
| Astragalus whitneyi | A.Gray | Fabaceae | 8 |
| Astragalus wootonii | E.Sheld. | Fabaceae | 8 |
| Astrolepis cochisensis | (Goodd.) D.M.Benham & Windham | Pteridaceae | 8 |
| Athyrium americanum | (Butters) Maxon | Athyriaceae | 8 |
| Athysanus pusillus | Greene | Brassicaceae | 8 |
| Atrichoseris platyphylla | (A.Gray) A.Gray | Asteraceae | 8 |
| Atriplex argentea | Nutt. | Chenopodiaceae | 8 |
| Atriplex barclayana | (Benth.) D.Dietr. | Chenopodiaceae | 8 |
| Atriplex canescens | (Pursh) Nutt. | Chenopodiaceae | 8 |
| Atriplex confertifolia | (Torr. & Frém.) S.Watson | Chenopodiaceae | 8 |
| Atriplex elegans | (Moq.) D.Dietr. | Chenopodiaceae | 8 |
| Atriplex fruticulosa | Jeps. | Chenopodiaceae | 8 |
| Atriplex hymenelytra | (Torr.) S.Watson | Chenopodiaceae | 8 |
| Atriplex lentiformis | (Torr.) S.Watson | Chenopodiaceae | 8 |
| Atriplex leucophylla | (Moq.) D.Dietr. | Chenopodiaceae | 8 |
| Atriplex pacifica | A.Nelson | Chenopodiaceae | 8 |
| Atriplex parishii | S.Watson | Chenopodiaceae | 8 |
| Atriplex parryi | S.Watson | Chenopodiaceae | 8 |
| Atriplex patula | L. | Chenopodiaceae | 8 |
| Atriplex phyllostegia | (Torr. ex S.Watson) S.Watson | Chenopodiaceae | 8 |
| Atriplex polycarpa | (Torr.) S.Watson | Chenopodiaceae | 8 |
| Atriplex spinifera | J.F.Macbr. | Chenopodiaceae | 8 |
| Atriplex watsonii | A.Nelson ex Abrams | Chenopodiaceae | 8 |
| Ayenia compacta | Rose | Malvaceae | 8 |
| Azolla filiculoides | Lam. | Salviniaceae | 8 |
| Baccharis brachyphylla | A.Gray | Asteraceae | 8 |
| Baccharis glutinosa | Pers. | Asteraceae | 8 |
| Baccharis pilularis | DC. | Asteraceae | 8 |
| Baccharis plummerae | A.Gray | Asteraceae | 8 |
| Baccharis salicifolia | (Ruiz & Pav.) Pers. | Asteraceae | 8 |
| Baccharis salicina | Torr. & A.Gray | Asteraceae | 8 |
| Baccharis sarothroides | A.Gray | Asteraceae | 8 |
| Baccharis sergiloides | A.Gray | Asteraceae | 8 |
| Baileya pauciradiata | Harv. & A.Gray | Asteraceae | 8 |
| Baileya pleniradiata | Harv. & A.Gray | Asteraceae | 8 |
| Balsamorhiza deltoidea | Nutt. | Asteraceae | 8 |
| Balsamorhiza hookeri | Nutt. | Asteraceae | 8 |
| Balsamorhiza incana | Nutt. | Asteraceae | 8 |
| Balsamorhiza lanata | (W.M.Sharp) W.A.Weber | Asteraceae | 8 |
| Balsamorhiza macrolepis | W.M.Sharp | Asteraceae | 8 |
| Balsamorhiza sericea | W.A.Weber | Asteraceae | 8 |
| Balsamorhiza serrata | A.Nelson & J.F.Macbr. | Asteraceae | 8 |
| Barbarea orthoceras | Ledeb. | Brassicaceae | 8 |
| Batis maritima | L. | Bataceae | 8 |
| Bebbia juncea | Greene | Asteraceae | 8 |
| Beckmannia syzigachne | (Steud.) Fernald | Poaceae | 8 |
| Berberis aquifolium | Pursh | Berberidaceae | 8 |
| Berberis dictyota | Jeps. | Berberidaceae | 8 |
| Berberis fremontii | Torr. | Berberidaceae | 8 |
| Berberis haematocarpa | Wooton | Berberidaceae | 8 |
| Berberis nervosa | Pursh | Berberidaceae | 8 |
| Berberis nevinii | A.Gray | Berberidaceae | 8 |
| Berberis pinnata | Lag. | Berberidaceae | 8 |
| Berberis piperiana | (Abrams) McMinn | Berberidaceae | 8 |
| Berberis pumila | Greene | Berberidaceae | 8 |
| Berberis repens | Lindl. | Berberidaceae | 8 |
| Bergerocactus emoryi | (Engelm.) Britton & Rose | Cactaceae | 8 |
| Bernardia incana | C.V.Morton | Euphorbiaceae | 8 |
| Berula erecta | (Huds.) Coville | Apiaceae | 8 |
| Betula glandulosa | Michx. | Betulaceae | 8 |
| Betula occidentalis | Hook. | Betulaceae | 8 |
| Betula pumila | L. | Betulaceae | 8 |
| Bidens alba | DC. | Asteraceae | 8 |
| Bidens cernua | L. | Asteraceae | 8 |
| Bidens frondosa | L. | Asteraceae | 8 |
| Bidens laevis | (L.) Britton, Sterns & Poggenb. | Asteraceae | 8 |
| Bidens tripartita | L. | Asteraceae | 8 |
| Bidens vulgata | Greene | Asteraceae | 8 |
| Blennosperma bakeri | Heiser | Asteraceae | 8 |
| Blennosperma nanum | (Hook.) S.F.Blake | Asteraceae | 8 |
| Blepharidachne kingii | (S.Watson) Hack. | Poaceae | 8 |
| Blepharipappus scaber | Hook. | Asteraceae | 8 |
| Blepharizonia laxa | Greene | Asteraceae | 8 |
| Blepharizonia plumosa | (Kellogg) Greene | Asteraceae | 8 |
| Blitum californicum | S.Watson | Chenopodiaceae | 8 |
| Blitum capitatum | L. | Chenopodiaceae | 8 |
| Blitum nuttallianum | Schult. | Chenopodiaceae | 8 |
| Bloomeria clevelandii | S.Watson | Asparagaceae | 8 |
| Bloomeria crocea | (Torr.) Coville | Asparagaceae | 8 |
| Bloomeria humilis | Hoover | Asparagaceae | 8 |
| Boechera angustifolia | (Nutt.) Dorn | Brassicaceae | 8 |
| Boechera arcuata | (Nutt.) Windham & Al-Shehbaz | Brassicaceae | 8 |
| Boechera bodiensis | (Rollins) Al-Shehbaz | Brassicaceae | 8 |
| Boechera breweri | (S.Watson) Al-Shehbaz | Brassicaceae | 8 |
| Boechera californica | (Rollins) Windham & Al-Shehbaz | Brassicaceae | 8 |
| Boechera davidsonii | (Greene) N.H.Holmgren | Brassicaceae | 8 |
| Boechera dispar | (M.E.Jones) Al-Shehbaz | Brassicaceae | 8 |
| Boechera divaricarpa | (A.Nelson) Á.Löve & D.Löve | Brassicaceae | 8 |
| Boechera glaucovalvula | (M.E.Jones) Al-Shehbaz | Brassicaceae | 8 |
| Boechera howellii | (S.Watson) Windham & Al-Shehbaz | Brassicaceae | 8 |
| Boechera johnstonii | (Munz) Al-Shehbaz | Brassicaceae | 8 |
| Boechera koehleri | (Howell) Al-Shehbaz | Brassicaceae | 8 |
| Boechera lemmonii | (S.Watson) W.A.Weber | Brassicaceae | 8 |
| Boechera lyallii | (S.Watson) Dorn | Brassicaceae | 8 |
| Boechera parishii | (S.Watson) Al-Shehbaz | Brassicaceae | 8 |
| Boechera pauciflora | (Nutt.) Windham & Al-Shehbaz | Brassicaceae | 8 |
| Boechera pendulina | (Greene) W.A.Weber | Brassicaceae | 8 |
| Boechera pendulocarpa | (A.Nelson) Windham & Al-Shehbaz | Brassicaceae | 8 |
| Boechera perennans | (S.Watson) W.A.Weber | Brassicaceae | 8 |
| Boechera platysperma | (A.Gray) Al-Shehbaz | Brassicaceae | 8 |
| Boechera puberula | (Nutt.) Dorn | Brassicaceae | 8 |
| Boechera pulchra | (M.E.Jones ex S.Watson) W.A.Weber | Brassicaceae | 8 |
| Boechera pygmaea | (Rollins) Al-Shehbaz | Brassicaceae | 8 |
| Boechera retrofracta | (Graham) Á.Löve & D.Löve | Brassicaceae | 8 |
| Boechera shockleyi | (Munz) Dorn | Brassicaceae | 8 |
| Boechera sparsiflora | (Nutt.) Dorn | Brassicaceae | 8 |
| Boechera subpinnatifida | (S.Watson) Al-Shehbaz | Brassicaceae | 8 |
| Boerhavia coccinea | Mill. | Nyctaginaceae | 8 |
| Boerhavia coulteri | (Hook.f.) S.Watson | Nyctaginaceae | 8 |
| Boerhavia triquetra | S.Watson | Nyctaginaceae | 8 |
| Boerhavia wrightii | A.Gray | Nyctaginaceae | 8 |
| Bolandra californica | A.Gray | Saxifragaceae | 8 |
| Bolboschoenus fluviatilis | (Torr.) Soják | Cyperaceae | 8 |
| Bolboschoenus maritimus | (L.) Palla | Cyperaceae | 8 |
| Bolboschoenus robustus | (Pursh) Soják | Cyperaceae | 8 |
| Bothriochloa barbinodis | (Lag.) Herter | Poaceae | 8 |
| Bothriochloa torreyana | (Steud.) Scrivanti & Anton | Poaceae | 8 |
| Botrychium ascendens | W.H.Wagner | Ophioglossaceae | 8 |
| Botrychium crenulatum | W.H.Wagner | Ophioglossaceae | 8 |
| Botrychium lanceolatum | (Gmel.) Ångstr. | Ophioglossaceae | 8 |
| Botrychium lineare | W.H.Wagner | Ophioglossaceae | 8 |
| Botrychium minganense | Vict. | Ophioglossaceae | 8 |
| Botrychium montanum | W.H.Wagner | Ophioglossaceae | 8 |
| Botrychium pinnatum | H.St.John | Ophioglossaceae | 8 |
| Botrychium simplex | E.Hitchc. | Ophioglossaceae | 8 |
| Botrypus virginianus | (L.) Michx. | Ophioglossaceae | 8 |
| Bouteloua aristidoides | (Kunth) Griseb. | Poaceae | 8 |
| Bouteloua barbata | Lag. | Poaceae | 8 |
| Bouteloua curtipendula | (Michx.) Torr. | Poaceae | 8 |
| Bouteloua eriopoda | (Torr.) Torr. | Poaceae | 8 |
| Bouteloua gracilis | (Kunth) Lag. ex Griffiths | Poaceae | 8 |
| Bouteloua trifida | Thurb. ex S.Watson | Poaceae | 8 |
| Bowlesia incana | Ruiz & Pav. | Apiaceae | 8 |
| Boykinia major | A.Gray | Saxifragaceae | 8 |
| Boykinia occidentalis | Torr. & A.Gray | Saxifragaceae | 8 |
| Boykinia rotundifolia | Parry ex A.Gray | Saxifragaceae | 8 |
| Brandegea bigelovii | (S.Watson) Cogn. | Cucurbitaceae | 8 |
| Brasenia schreberi | J.F.Gmel. | Cabombaceae | 8 |
| Brewerimitella breweri | (A.Gray) R.A.Folk & Y.Okuyama | Saxifragaceae | 8 |
| Brewerimitella ovalis | (Greene) R.A.Folk & Y.Okuyama | Saxifragaceae | 8 |
| Brickellia atractyloides | A.Gray | Asteraceae | 8 |
| Brickellia desertorum | Coville | Asteraceae | 8 |
| Brickellia frutescens | A.Gray | Asteraceae | 8 |
| Brickellia grandiflora | Nutt. | Asteraceae | 8 |
| Brickellia greenei | A.Gray | Asteraceae | 8 |
| Brickellia incana | A.Gray | Asteraceae | 8 |
| Brickellia longifolia | S.Watson | Asteraceae | 8 |
| Brickellia microphylla | (Nutt.) A.Gray | Asteraceae | 8 |
| Brickellia nevinii | A.Gray | Asteraceae | 8 |
| Brickellia oblongifolia | Nutt. | Asteraceae | 8 |
| Brodiaea appendiculata | Hoover | Asparagaceae | 8 |
| Brodiaea coronaria | (Salisb.) Jeps. | Asparagaceae | 8 |
| Brodiaea elegans | Hoover | Asparagaceae | 8 |
| Brodiaea filifolia | S.Watson | Asparagaceae | 8 |
| Brodiaea jolonensis | Eastw. | Asparagaceae | 8 |
| Brodiaea kinkiensis | T.F.Niehaus | Asparagaceae | 8 |
| Brodiaea minor | S.Watson | Asparagaceae | 8 |
| Brodiaea nana | Hoover | Asparagaceae | 8 |
| Brodiaea orcuttii | (Greene) Baker | Asparagaceae | 8 |
| Brodiaea stellaris | S.Watson | Asparagaceae | 8 |
| Brodiaea terrestris | Kellogg | Asparagaceae | 8 |
| Bromus carinatus | Hook. & Arn. | Poaceae | 8 |
| Bromus ciliatus | L. | Poaceae | 8 |
| Bromus laevipes | Shear | Poaceae | 8 |
| Bromus porteri | (Coult.) Nash | Poaceae | 8 |
| Bromus sitchensis | Trin. | Poaceae | 8 |
| Bromus vulgaris | (Hook.) Shear | Poaceae | 8 |
| Buddleja utahensis | Coville | Scrophulariaceae | 8 |
| Bulbostylis capillaris | (L.) Kunth ex C.B.Clarke | Cyperaceae | 8 |
| Bursera microphylla | A.Gray | Burseraceae | 8 |
| Cacaliopsis nardosmia | (A.Gray) A.Gray | Asteraceae | 8 |
| Calamagrostis breviligulata | (Fernald) Saarela | Poaceae | 8 |
| Calamagrostis canadensis | (Michx.) P.Beauv. | Poaceae | 8 |
| Calamagrostis inexpansa | A.Gray | Poaceae | 8 |
| Calamagrostis muiriana | B.L.Wilson & Sami Gray | Poaceae | 8 |
| Calamagrostis nutkaensis | (J.Presl) Steud. | Poaceae | 8 |
| Calamagrostis ophitidis | (J.T.Howell) Nygren | Poaceae | 8 |
| Calamagrostis purpurascens | R.Br. | Poaceae | 8 |
| Calamagrostis purpurea | (Trin.) Trin. | Poaceae | 8 |
| Calamagrostis rubescens | Buckley | Poaceae | 8 |
| Calamagrostis stricta | (Timm) Koeler | Poaceae | 8 |
| Calandrinia breweri | S.Watson | Montiaceae | 8 |
| Calandrinia ciliata | (Ruiz & Pav.) DC. | Montiaceae | 8 |
| California macrophylla | (Hook. & Arn.) Aldasoro, C.Navarro, P.Vargas, L.Sáez & Aedo | Geraniaceae | 8 |
| Calliandra eriophylla | Benth. | Fabaceae | 8 |
| Calliscirpus brachythrix | C.N.Gilmour, J.R.Starr & Naczi | Cyperaceae | 8 |
| Calliscirpus criniger | (A.Gray) C.N.Gilmour, J.R.Starr & Naczi | Cyperaceae | 8 |
| Callitriche heterophylla | Pursh | Plantaginaceae | 8 |
| Callitriche palustris | L. | Plantaginaceae | 8 |
| Callitropsis nootkatensis | (D.Don) Oerst. | Cupressaceae | 8 |
| Calocedrus decurrens | (Torr.) Florin | Cupressaceae | 8 |
| Calochortus albus | (Benth.) Douglas ex Benth. | Liliaceae | 8 |
| Calochortus amabilis | Purdy | Liliaceae | 8 |
| Calochortus amoenus | Greene | Liliaceae | 8 |
| Calochortus argillosus | (Hoover) Zebzll & Fielder | Liliaceae | 8 |
| Calochortus bruneaunis | A.Nelson & J.F.Macbr. | Liliaceae | 8 |
| Calochortus catalinae | S.Watson | Liliaceae | 8 |
| Calochortus clavatus | S.Watson | Liliaceae | 8 |
| Calochortus coeruleus | (Kellogg) S.Watson | Liliaceae | 8 |
| Calochortus dunnii | Purdy | Liliaceae | 8 |
| Calochortus elegans | Pursh | Liliaceae | 8 |
| Calochortus excavatus | Greene | Liliaceae | 8 |
| Calochortus fimbriatus | H.P.McDonald | Liliaceae | 8 |
| Calochortus flexuosus | S.Watson | Liliaceae | 8 |
| Calochortus invenustus | Greene | Liliaceae | 8 |
| Calochortus kennedyi | Porter | Liliaceae | 8 |
| Calochortus leichtlinii | Hook.f. | Liliaceae | 8 |
| Calochortus luteus | Douglas ex Lindl. | Liliaceae | 8 |
| Calochortus macrocarpus | Douglas | Liliaceae | 8 |
| Calochortus minimus | Ownbey | Liliaceae | 8 |
| Calochortus monophyllus | (Lindl.) Lem. | Liliaceae | 8 |
| Calochortus nudus | S.Watson | Liliaceae | 8 |
| Calochortus obispoensis | Lemmon | Liliaceae | 8 |
| Calochortus panamintensis | (Ownbey) Reveal | Liliaceae | 8 |
| Calochortus plummerae | Greene | Liliaceae | 8 |
| Calochortus pulchellus | (Benth.) Alph.Wood | Liliaceae | 8 |
| Calochortus raichei | Farwig & V.Girard | Liliaceae | 8 |
| Calochortus simulans | (Hoover) Munz | Liliaceae | 8 |
| Calochortus splendens | Douglas ex Benth. | Liliaceae | 8 |
| Calochortus striatus | Parish | Liliaceae | 8 |
| Calochortus superbus | Purdy ex Howell | Liliaceae | 8 |
| Calochortus syntrophus | Callahan | Liliaceae | 8 |
| Calochortus tiburonensis | A.J.Hill | Liliaceae | 8 |
| Calochortus tolmiei | Hook. & Arn. | Liliaceae | 8 |
| Calochortus umbellatus | Alph.Wood | Liliaceae | 8 |
| Calochortus uniflorus | Hook. & Arn. | Liliaceae | 8 |
| Calochortus venustus | Douglas ex Benth. | Liliaceae | 8 |
| Calochortus vestae | (Purdy) Wallace | Liliaceae | 8 |
| Calochortus weedii | Alph.Wood | Liliaceae | 8 |
| Calochortus westonii | Eastw. | Liliaceae | 8 |
| Caltha biflora | DC. | Ranunculaceae | 8 |
| Caltha leptosepala | DC. | Ranunculaceae | 8 |
| Calycadenia multiglandulosa | DC. | Asteraceae | 8 |
| Calycadenia truncata | DC. | Asteraceae | 8 |
| Calycadenia villosa | DC. | Asteraceae | 8 |
| Calycanthus occidentalis | Hook. & Arn. | Calycanthaceae | 8 |
| Calycoseris parryi | A.Gray | Asteraceae | 8 |
| Calycoseris wrightii | A.Gray | Asteraceae | 8 |
| Calypso bulbosa | (L.) Oakes | Orchidaceae | 8 |
| Calystegia atriplicifolia | Hallier f. | Convolvulaceae | 8 |
| Calystegia longipes | (S.Watson) Brummitt | Convolvulaceae | 8 |
| Calystegia macrostegia | (Greene) Brummitt | Convolvulaceae | 8 |
| Calystegia malacophylla | (Greene) Munz | Convolvulaceae | 8 |
| Calystegia occidentalis | (A.Gray) Brummitt | Convolvulaceae | 8 |
| Calystegia peirsonii | (Abrams) Brummitt | Convolvulaceae | 8 |
| Calystegia purpurata | (Greene) Brummitt | Convolvulaceae | 8 |
| Calystegia sepium | (L.) R.Br. | Convolvulaceae | 8 |
| Calystegia subacaulis | Hook. & Arn. | Convolvulaceae | 8 |
| Camassia leichtlinii | (Baker) S.Watson | Asparagaceae | 8 |
| Camassia quamash | (Pursh) Greene | Asparagaceae | 8 |
| Camissonia campestris | (Greene) P.H.Raven | Onagraceae | 8 |
| Camissonia contorta | (Douglas) Kearney | Onagraceae | 8 |
| Camissonia parvula | (Nutt. ex Torr. & A.Gray) P.H.Raven | Onagraceae | 8 |
| Camissonia pusilla | P.H.Raven | Onagraceae | 8 |
| Camissonia strigulosa | (Fisch. & C.A.Mey.) P.H.Raven | Onagraceae | 8 |
| Camissoniopsis bistorta | (Nutt. ex Torr. & A.Gray) W.L.Wagner & Hoch | Onagraceae | 8 |
| Camissoniopsis cheiranthifolia | (Hornem. ex Spreng.) W.L.Wagner & Hoch | Onagraceae | 8 |
| Camissoniopsis hirtella | (Greene) W.L.Wagner & Hoch | Onagraceae | 8 |
| Camissoniopsis ignota | (Jeps.) W.L.Wagner & Hoch | Onagraceae | 8 |
| Camissoniopsis lewisii | (P.H.Raven) W.L.Wagner & Hoch | Onagraceae | 8 |
| Camissoniopsis micrantha | (Hornem. ex Spreng.) W.L.Wagner & Hoch | Onagraceae | 8 |
| Camissoniopsis pallida | (Abrams) W.L.Wagner & Hoch | Onagraceae | 8 |
| Campanula petiolata | A.DC. | Campanulaceae | 8 |
| Campanula scabrella | Engelm. | Campanulaceae | 8 |
| Campanula scouleri | Hook. ex A.DC. | Campanulaceae | 8 |
| Campanula shetleri | Heckard | Campanulaceae | 8 |
| Canbya candida | Parry ex A.Gray | Papaveraceae | 8 |
| Cardamine angulata | Hook. | Brassicaceae | 8 |
| Cardamine bellidifolia | L. | Brassicaceae | 8 |
| Cardamine breweri | S.Watson | Brassicaceae | 8 |
| Cardamine californica | (Nutt.) Greene | Brassicaceae | 8 |
| Cardamine cordifolia | A.Gray | Brassicaceae | 8 |
| Cardamine nuttallii | Greene | Brassicaceae | 8 |
| Cardamine oligosperma | Nutt. | Brassicaceae | 8 |
| Cardamine pensylvanica | Muhl. ex Willd. | Brassicaceae | 8 |
| Carex amplifolia | Boott | Cyperaceae | 8 |
| Carex aquatilis | Wahlenb. | Cyperaceae | 8 |
| Carex atherodes | Spreng. | Cyperaceae | 8 |
| Carex athrostachya | Olney | Cyperaceae | 8 |
| Carex aurea | Nutt. | Cyperaceae | 8 |
| Carex barbarae | Dewey | Cyperaceae | 8 |
| Carex bella | L.H.Bailey | Cyperaceae | 8 |
| Carex breweri | Boott | Cyperaceae | 8 |
| Carex brunnescens | (Pers.) Poir. | Cyperaceae | 8 |
| Carex canescens | L. | Cyperaceae | 8 |
| Carex capillaris | L. | Cyperaceae | 8 |
| Carex capitata | Sol. | Cyperaceae | 8 |
| Carex comosa | Boott | Cyperaceae | 8 |
| Carex concinnoides | Mack. | Cyperaceae | 8 |
| Carex congdonii | L.H.Bailey | Cyperaceae | 8 |
| Carex cusickii | Mack. | Cyperaceae | 8 |
| Carex deflexa | Hornem. | Cyperaceae | 8 |
| Carex densa | (L.H.Bailey) L.H.Bailey | Cyperaceae | 8 |
| Carex diandra | Schrank | Cyperaceae | 8 |
| Carex disperma | Dewey | Cyperaceae | 8 |
| Carex douglasii | Boott | Cyperaceae | 8 |
| Carex duriuscula | C.A.Mey. | Cyperaceae | 8 |
| Carex echinata | Murray | Cyperaceae | 8 |
| Carex exsiccata | L.H.Bailey | Cyperaceae | 8 |
| Carex feta | L.H.Bailey | Cyperaceae | 8 |
| Carex filifolia | Nutt. | Cyperaceae | 8 |
| Carex fracta | Mack. | Cyperaceae | 8 |
| Carex garberi | Fernald | Cyperaceae | 8 |
| Carex globosa | Boott | Cyperaceae | 8 |
| Carex gynodynama | Olney | Cyperaceae | 8 |
| Carex haydeniana | Olney | Cyperaceae | 8 |
| Carex hendersonii | L.H.Bailey | Cyperaceae | 8 |
| Carex heteroneura | W.Boott | Cyperaceae | 8 |
| Carex hoodii | Boott | Cyperaceae | 8 |
| Carex idahoa | L.H.Bailey | Cyperaceae | 8 |
| Carex illota | L.H.Bailey | Cyperaceae | 8 |
| Carex incurviformis | Mack. | Cyperaceae | 8 |
| Carex inops | L.H.Bailey | Cyperaceae | 8 |
| Carex interior | L.H.Bailey | Cyperaceae | 8 |
| Carex kelloggii | W.Boott | Cyperaceae | 8 |
| Carex laeviculmis | Meinsh. | Cyperaceae | 8 |
| Carex lasiocarpa | Ehrh. | Cyperaceae | 8 |
| Carex leporina | L. | Cyperaceae | 8 |
| Carex leptalea | Wahlenb. | Cyperaceae | 8 |
| Carex leptopoda | Mack. | Cyperaceae | 8 |
| Carex limosa | L. | Cyperaceae | 8 |
| Carex luzulina | Olney | Cyperaceae | 8 |
| Carex lyngbyei | Hornem. | Cyperaceae | 8 |
| Carex mendocinensis | Olney ex Boott | Cyperaceae | 8 |
| Carex mertensii | J.D.Prescott ex Bong. | Cyperaceae | 8 |
| Carex micropoda | C.A.Mey. | Cyperaceae | 8 |
| Carex microptera | Mack. | Cyperaceae | 8 |
| Carex multicaulis | L.H.Bailey | Cyperaceae | 8 |
| Carex myosuroides | Vill. | Cyperaceae | 8 |
| Carex nardina | (Hornem.) Fr. | Cyperaceae | 8 |
| Carex nigricans | C.A.Mey. | Cyperaceae | 8 |
| Carex nudata | W.Boott | Cyperaceae | 8 |
| Carex obispoensis | Stacey | Cyperaceae | 8 |
| Carex obnupta | L.H.Bailey | Cyperaceae | 8 |
| Carex occidentalis | L.H.Bailey | Cyperaceae | 8 |
| Carex pachystachya | Cham. ex Steud. | Cyperaceae | 8 |
| Carex pellita | Muhl. ex Willd. | Cyperaceae | 8 |
| Carex petasata | Dewey | Cyperaceae | 8 |
| Carex phaeocephala | Piper | Cyperaceae | 8 |
| Carex praegracilis | W.Boott | Cyperaceae | 8 |
| Carex praticola | Rydb. | Cyperaceae | 8 |
| Carex preslii | Steud. | Cyperaceae | 8 |
| Carex proposita | Mack. | Cyperaceae | 8 |
| Carex raynoldsii | Dewey | Cyperaceae | 8 |
| Carex rossii | Boott | Cyperaceae | 8 |
| Carex scabriuscula | Mack. | Cyperaceae | 8 |
| Carex scirpoidea | Michx. | Cyperaceae | 8 |
| Carex scoparia | Schkuhr ex Willd. | Cyperaceae | 8 |
| Carex senta | Boott | Cyperaceae | 8 |
| Carex serratodens | S.Watson | Cyperaceae | 8 |
| Carex spectabilis | Dewey | Cyperaceae | 8 |
| Carex spissa | L.H.Bailey ex Hemsl. | Cyperaceae | 8 |
| Carex stipata | Muhl. ex Willd. | Cyperaceae | 8 |
| Carex straminiformis | L.H.Bailey | Cyperaceae | 8 |
| Carex subfusca | W.Boott | Cyperaceae | 8 |
| Carex tahoensis | Smiley | Cyperaceae | 8 |
| Carex triquetra | Boott | Cyperaceae | 8 |
| Carex tumulicola | Mack. | Cyperaceae | 8 |
| Carex unilateralis | Mack. | Cyperaceae | 8 |
| Carex utriculata | Boott | Cyperaceae | 8 |
| Carex vallicola | Dewey | Cyperaceae | 8 |
| Carex vesicaria | L. | Cyperaceae | 8 |
| Carex vulpinoidea | Michx. | Cyperaceae | 8 |
| Carex whitneyi | Olney | Cyperaceae | 8 |
| Carex xerophila | Janeway & Zika | Cyperaceae | 8 |
| Carlowrightia arizonica | A.Gray | Acanthaceae | 8 |
| Carnegiea gigantea | (Engelm.) Britton & Rose | Cactaceae | 8 |
| Cascadia nuttallii | A.M.Johnson | Saxifragaceae | 8 |
| Cassiope mertensiana | (Bong.) G.Don | Ericaceae | 8 |
| Castela emoryi | (A.Gray) Moran & Felger | Simaroubaceae | 8 |
| Castilleja affinis | Hook. & Arn. | Orobanchaceae | 8 |
| Castilleja ambigua | Hook. & Arn. | Orobanchaceae | 8 |
| Castilleja applegatei | Fernald | Orobanchaceae | 8 |
| Castilleja arachnoidea | Greenm. | Orobanchaceae | 8 |
| Castilleja attenuata | (A.Gray) T.I.Chuang & Heckard | Orobanchaceae | 8 |
| Castilleja brevilobata | Piper | Orobanchaceae | 8 |
| Castilleja brevistyla | (Hoover) T.I.Chuang & Heckard | Orobanchaceae | 8 |
| Castilleja campestris | (Benth.) T.I.Chuang & Heckard | Orobanchaceae | 8 |
| Castilleja chromosa | A.Nelson | Orobanchaceae | 8 |
| Castilleja cinerea | A.Gray | Orobanchaceae | 8 |
| Castilleja densiflora | (Benth.) T.I.Chuang & Heckard | Orobanchaceae | 8 |
| Castilleja disticha | Eastw. | Orobanchaceae | 8 |
| Castilleja elata | Piper | Orobanchaceae | 8 |
| Castilleja exserta | (A.Heller) T.I.Chuang & Heckard | Orobanchaceae | 8 |
| Castilleja foliolosa | Hook. & Arn. | Orobanchaceae | 8 |
| Castilleja grisea | Dunkle | Orobanchaceae | 8 |
| Castilleja hololeuca | Greene | Orobanchaceae | 8 |
| Castilleja lacera | (Benth.) T.I.Chuang & Heckard | Orobanchaceae | 8 |
| Castilleja lassenensis | Eastw. | Orobanchaceae | 8 |
| Castilleja latifolia | Hook. & Arn. | Orobanchaceae | 8 |
| Castilleja lemmonii | A.Gray | Orobanchaceae | 8 |
| Castilleja linariifolia | Benth. | Orobanchaceae | 8 |
| Castilleja lineariloba | (Benth.) T.I.Chuang & Heckard | Orobanchaceae | 8 |
| Castilleja litoralis | Pennell | Orobanchaceae | 8 |
| Castilleja martini | Abrams | Orobanchaceae | 8 |
| Castilleja mendocinensis | (Eastw.) Pennell | Orobanchaceae | 8 |
| Castilleja miniata | Douglas ex Benth. | Orobanchaceae | 8 |
| Castilleja minor | (A.Gray) A.Gray | Orobanchaceae | 8 |
| Castilleja mollis | Pennell | Orobanchaceae | 8 |
| Castilleja nana | Eastw. | Orobanchaceae | 8 |
| Castilleja parviflora | Bong. | Orobanchaceae | 8 |
| Castilleja peirsonii | Eastw. | Orobanchaceae | 8 |
| Castilleja pilosa | (S.Watson) Rydb. | Orobanchaceae | 8 |
| Castilleja plagiotoma | A.Gray | Orobanchaceae | 8 |
| Castilleja pruinosa | Fernald | Orobanchaceae | 8 |
| Castilleja rubicundula | (Jeps.) T.I.Chuang & Heckard | Orobanchaceae | 8 |
| Castilleja schizotricha | Greenm. | Orobanchaceae | 8 |
| Castilleja subinclusa | Greene | Orobanchaceae | 8 |
| Castilleja tenuis | (A.Heller) T.I.Chuang & Heckard | Orobanchaceae | 8 |
| Castilleja wightii | Elmer | Orobanchaceae | 8 |
| Ceanothus arboreus | Greene | Rhamnaceae | 8 |
| Ceanothus cordulatus | Kellogg | Rhamnaceae | 8 |
| Ceanothus crassifolius | Torr. | Rhamnaceae | 8 |
| Ceanothus cuneatus | (Hook.) Nutt. | Rhamnaceae | 8 |
| Ceanothus cyaneus | Eastw. | Rhamnaceae | 8 |
| Ceanothus divergens | Parry | Rhamnaceae | 8 |
| Ceanothus ferrisiae | McMinn | Rhamnaceae | 8 |
| Ceanothus foliosus | Parry | Rhamnaceae | 8 |
| Ceanothus fresnensis | Dudley ex Abrams | Rhamnaceae | 8 |
| Ceanothus gloriosus | J.T.Howell | Rhamnaceae | 8 |
| Ceanothus hearstiorum | Hoover & Roof | Rhamnaceae | 8 |
| Ceanothus impressus | Trel. | Rhamnaceae | 8 |
| Ceanothus incanus | Torr. & A.Gray | Rhamnaceae | 8 |
| Ceanothus jepsonii | Greene | Rhamnaceae | 8 |
| Ceanothus lemmonii | Parry | Rhamnaceae | 8 |
| Ceanothus leucodermis | Greene | Rhamnaceae | 8 |
| Ceanothus maritimus | Hoover | Rhamnaceae | 8 |
| Ceanothus megacarpus | Nutt. | Rhamnaceae | 8 |
| Ceanothus oliganthus | Nutt. | Rhamnaceae | 8 |
| Ceanothus palmeri | Trel. | Rhamnaceae | 8 |
| Ceanothus parryi | Trel. | Rhamnaceae | 8 |
| Ceanothus parvifolius | (S.Watson) Trel. | Rhamnaceae | 8 |
| Ceanothus pauciflorus | DC. | Rhamnaceae | 8 |
| Ceanothus pinetorum | J.M.Coult. | Rhamnaceae | 8 |
| Ceanothus prostratus | Benth. | Rhamnaceae | 8 |
| Ceanothus pumilus | Greene | Rhamnaceae | 8 |
| Ceanothus roderickii | W.Knight | Rhamnaceae | 8 |
| Ceanothus sanguineus | Pursh | Rhamnaceae | 8 |
| Ceanothus spinosus | Nutt. | Rhamnaceae | 8 |
| Ceanothus thyrsiflorus | Eschsch. | Rhamnaceae | 8 |
| Ceanothus tomentosus | Parry | Rhamnaceae | 8 |
| Ceanothus velutinus | Douglas | Rhamnaceae | 8 |
| Ceanothus verrucosus | Nutt. | Rhamnaceae | 8 |
| Celtis reticulata | Torr. | Cannabaceae | 8 |
| Cenchrus echinatus | L. | Poaceae | 8 |
| Cenchrus spinifex | Cav. | Poaceae | 8 |
| Centromadia fitchii | Greene | Asteraceae | 8 |
| Centromadia parryi | (Greene) Greene | Asteraceae | 8 |
| Centromadia pungens | Greene | Asteraceae | 8 |
| Cephalanthera austiniae | (A.Gray) A.Heller | Orchidaceae | 8 |
| Cephalanthus occidentalis | L. | Rubiaceae | 8 |
| Cerastium beeringianum | Cham. & Schltdl. | Caryophyllaceae | 8 |
| Ceratophyllum demersum | L. | Ceratophyllaceae | 8 |
| Cercis occidentalis | Torr. ex A.Gray | Fabaceae | 8 |
| Cercocarpus betuloides | Nutt. | Rosaceae | 8 |
| Cercocarpus intricatus | S.Watson | Rosaceae | 8 |
| Cercocarpus ledifolius | Nutt. | Rosaceae | 8 |
| Cercocarpus montanus | Raf. | Rosaceae | 8 |
| Chaenactis alpigena | Sharsm. | Asteraceae | 8 |
| Chaenactis artemisiifolia | A.Gray | Asteraceae | 8 |
| Chaenactis carphoclinia | A.Gray | Asteraceae | 8 |
| Chaenactis douglasii | Hook. & Arn. | Asteraceae | 8 |
| Chaenactis fremontii | A.Gray | Asteraceae | 8 |
| Chaenactis glabriuscula | DC. | Asteraceae | 8 |
| Chaenactis macrantha | D.C.Eaton | Asteraceae | 8 |
| Chaenactis nevadensis | A.Gray | Asteraceae | 8 |
| Chaenactis parishii | A.Gray | Asteraceae | 8 |
| Chaenactis santolinoides | Greene | Asteraceae | 8 |
| Chaenactis stevioides | Hook. & Arn. | Asteraceae | 8 |
| Chaenactis suffrutescens | A.Gray | Asteraceae | 8 |
| Chaenactis xantiana | A.Gray | Asteraceae | 8 |
| Chaetadelpha wheeleri | A.Gray ex S.Watson | Asteraceae | 8 |
| Chaetopappa ericoides | (Torr.) G.L.Nesom | Asteraceae | 8 |
| Chamaebatia foliolosa | Benth. | Rosaceae | 8 |
| Chamaebatiaria millefolium | (Torr.) Maxim. | Rosaceae | 8 |
| Chamaecyparis lawsoniana | (A.Murray bis) Parl. | Cupressaceae | 8 |
| Chamaesaracha coronopus | (Dunal) A.Gray | Solanaceae | 8 |
| Chenopodium atrovirens | Rydb. | Chenopodiaceae | 8 |
| Chenopodium berlandieri | Moq. | Chenopodiaceae | 8 |
| Chenopodium fremontii | S.Watson | Chenopodiaceae | 8 |
| Chenopodium incanum | (S.Watson) A.Heller | Chenopodiaceae | 8 |
| Chenopodium leptophyllum | (Nutt. ex Moq.) B.D.Jacks. | Chenopodiaceae | 8 |
| Chenopodium littoreum | Benet-Pierce & M.G.Simpson | Chenopodiaceae | 8 |
| Chenopodium rubrum | L. | Chenopodiaceae | 8 |
| Cherleria obtusiloba | (Rydb.) A.J.Moore & Dillenb. | Caryophyllaceae | 8 |
| Chilopsis linearis | (Cav.) Sweet | Bignoniaceae | 8 |
| Chimaphila menziesii | (R.Br. ex D.Don) Spreng. | Ericaceae | 8 |
| Chimaphila umbellata | (L.) W.P.C.Barton | Ericaceae | 8 |
| Chloracantha spinosa | (Benth.) G.L.Nesom | Asteraceae | 8 |
| Chloris verticillata | Nutt. | Poaceae | 8 |
| Chloris virgata | Sw. | Poaceae | 8 |
| Chlorogalum grandiflorum | Hoover | Asparagaceae | 8 |
| Chlorogalum pomeridianum | (DC.) Kunth | Asparagaceae | 8 |
| Chloropyron maritimum | (Nutt. ex Benth.) A.Heller | Orobanchaceae | 8 |
| Chloropyron palmatum | (Ferris) Tank & J.M.Egger | Orobanchaceae | 8 |
| Chorizanthe biloba | Goodman | Polygonaceae | 8 |
| Chorizanthe brevicornu | Torr. | Polygonaceae | 8 |
| Chorizanthe breweri | S.Watson | Polygonaceae | 8 |
| Chorizanthe corrugata | (Torr.) Torr. & A.Gray | Polygonaceae | 8 |
| Chorizanthe cuspidata | S.Watson | Polygonaceae | 8 |
| Chorizanthe diffusa | Benth. | Polygonaceae | 8 |
| Chorizanthe douglasii | Benth. | Polygonaceae | 8 |
| Chorizanthe fimbriata | Nutt. | Polygonaceae | 8 |
| Chorizanthe leptotheca | Goodman | Polygonaceae | 8 |
| Chorizanthe membranacea | Benth. | Polygonaceae | 8 |
| Chorizanthe obovata | Goodman | Polygonaceae | 8 |
| Chorizanthe orcuttiana | Parry | Polygonaceae | 8 |
| Chorizanthe palmeri | S.Watson | Polygonaceae | 8 |
| Chorizanthe procumbens | Nutt. | Polygonaceae | 8 |
| Chorizanthe pungens | Benth. | Polygonaceae | 8 |
| Chorizanthe rigida | (Torr.) Torr. & A.Gray | Polygonaceae | 8 |
| Chorizanthe spinosa | S.Watson | Polygonaceae | 8 |
| Chorizanthe staticoides | Benth. | Polygonaceae | 8 |
| Chorizanthe uniaristata | Torr. & A.Gray | Polygonaceae | 8 |
| Chorizanthe valida | S.Watson | Polygonaceae | 8 |
| Chorizanthe watsonii | Torr. & A.Gray | Polygonaceae | 8 |
| Chorizanthe xanti | S.Watson | Polygonaceae | 8 |
| Chrysolepis chrysophylla | (Douglas ex Hook.) Hjelmq. | Fagaceae | 8 |
| Chrysolepis sempervirens | (Kellogg) Hjelmq. | Fagaceae | 8 |
| Chrysopsis oregona | (Nutt.) A.Gray | Asteraceae | 8 |
| Chrysosplenium glechomifolium | Nutt. | Saxifragaceae | 8 |
| Chrysothamnus depressus | Nutt. | Asteraceae | 8 |
| Chrysothamnus greenei | (A.Gray) Greene | Asteraceae | 8 |
| Chrysothamnus viscidiflorus | Nutt. | Asteraceae | 8 |
| Chthamalia parviflora | (Torr.) L.O.Alvarado & E.B.Cortez | Apocynaceae | 8 |
| Chylismia brevipes | (A.Gray) Small | Onagraceae | 8 |
| Chylismia cardiophylla | (Torr.) Small | Onagraceae | 8 |
| Chylismia claviformis | (Torr. & Frém.) A.Heller | Onagraceae | 8 |
| Chylismia heterochroma | (S.Watson) Small | Onagraceae | 8 |
| Chylismia walkeri | A.Nelson | Onagraceae | 8 |
| Chylismiella pterosperma | (S.Watson) W.L.Wagner & Hoch | Onagraceae | 8 |
| Cicendia quadrangularis | (Lam.) Griseb. | Gentianaceae | 8 |
| Cicuta douglasii | J.M.Coult. & Rose | Apiaceae | 8 |
| Cicuta maculata | L. | Apiaceae | 8 |
| Cinna bolanderi | Scribn. | Poaceae | 8 |
| Cinna latifolia | (Trevir. ex Göpp.) Griseb. | Poaceae | 8 |
| Circaea alpina | L. | Onagraceae | 8 |
| Cirsium andersonii | Petr. | Asteraceae | 8 |
| Cirsium andrewsii | Jeps. | Asteraceae | 8 |
| Cirsium arizonicum | (A.Gray) Petr. | Asteraceae | 8 |
| Cirsium brevistylum | Cronquist | Asteraceae | 8 |
| Cirsium canescens | Nutt. | Asteraceae | 8 |
| Cirsium cymosum | (Greene) J.T.Howell | Asteraceae | 8 |
| Cirsium douglasii | DC. | Asteraceae | 8 |
| Cirsium mohavense | (Greene) Petr. | Asteraceae | 8 |
| Cirsium neomexicanum | A.Gray | Asteraceae | 8 |
| Cirsium occidentale | (Nutt.) Jeps. | Asteraceae | 8 |
| Cirsium ochrocentrum | A.Gray | Asteraceae | 8 |
| Cirsium quercetorum | Jeps. | Asteraceae | 8 |
| Cirsium remotifolium | DC. | Asteraceae | 8 |
| Cirsium rhothophilum | S.F.Blake | Asteraceae | 8 |
| Cirsium scariosum | Nutt. | Asteraceae | 8 |
| Cirsium undulatum | (Nutt.) Spreng. | Asteraceae | 8 |
| Cistanthe maritima | (Nutt.) Carolin ex M.A.Hershkovitz | Montiaceae | 8 |
| Cistanthe monandra | (Nutt.) Hershk. | Montiaceae | 8 |
| Cistanthe monosperma | (Greene) Hershk. | Montiaceae | 8 |
| Cistanthe parryi | (A.Gray) Hershk. | Montiaceae | 8 |
| Cistanthe quadripetala | (S.Watson) Hershk. | Montiaceae | 8 |
| Cistanthe rosea | (S.Watson) Hershk. | Montiaceae | 8 |
| Cistanthe umbellata | (Torr.) Hershk. | Montiaceae | 8 |
| Cladium mariscus | (L.) Pohl | Cyperaceae | 8 |
| Clarkia affinis | F.H.Lewis & M.E.Lewis | Onagraceae | 8 |
| Clarkia amoena | (Lehm.) A.Nelson & J.F.Macbr. | Onagraceae | 8 |
| Clarkia arcuata | (Kellogg) A.Nelson & J.F.Macbr. | Onagraceae | 8 |
| Clarkia biloba | A.Nelson & J.F.Macbr. | Onagraceae | 8 |
| Clarkia bottae | (Spach) F.H.Lewis & M.E.Lewis | Onagraceae | 8 |
| Clarkia breweri | (A.Gray) Greene | Onagraceae | 8 |
| Clarkia concinna | Greene | Onagraceae | 8 |
| Clarkia cylindrica | (Jeps.) F.H.Lewis & M.E.Lewis | Onagraceae | 8 |
| Clarkia davyi | (Jeps.) F.H.Lewis | Onagraceae | 8 |
| Clarkia delicata | (Abrams) A.Nelson & J.F.Macbr. | Onagraceae | 8 |
| Clarkia dudleyana | (Abrams) J.F.Macbr. | Onagraceae | 8 |
| Clarkia epilobioides | (Nutt.) A.Nelson & J.F.Macbr. | Onagraceae | 8 |
| Clarkia franciscana | F.H.Lewis & P.H.Raven | Onagraceae | 8 |
| Clarkia gracilis | A.Nelson & J.F.Macbr. | Onagraceae | 8 |
| Clarkia heterandra | (Torr.) F.H.Lewis & P.H.Raven | Onagraceae | 8 |
| Clarkia lassenensis | (Eastw.) F.H.Lewis & M.E.Lewis | Onagraceae | 8 |
| Clarkia lewisii | P.H.Raven & D.R.Parn. | Onagraceae | 8 |
| Clarkia modesta | Jeps. | Onagraceae | 8 |
| Clarkia prostrata | F.H.Lewis & M.E.Lewis | Onagraceae | 8 |
| Clarkia purpurea | (Curtis) A.Nelson & J.F.Macbr. | Onagraceae | 8 |
| Clarkia rhomboidea | Douglas | Onagraceae | 8 |
| Clarkia rubicunda | (Lindl.) F.H.Lewis & M.E.Lewis | Onagraceae | 8 |
| Clarkia similis | F.H.Lewis & W.R.Ernst | Onagraceae | 8 |
| Clarkia speciosa | F.H.Lewis & M.E.Lewis | Onagraceae | 8 |
| Clarkia unguiculata | Lindl. | Onagraceae | 8 |
| Clarkia williamsonii | (Durand & Hilg.) F.H.Lewis & M.E.Lewis | Onagraceae | 8 |
| Clarkia xantiana | A.Gray | Onagraceae | 8 |
| Claytonia cordifolia | S.Watson | Montiaceae | 8 |
| Claytonia exigua | Torr. & A.Gray | Montiaceae | 8 |
| Claytonia gypsophiloides | Fisch. & C.A.Mey. | Montiaceae | 8 |
| Claytonia lanceolata | Pursh | Montiaceae | 8 |
| Claytonia megarhiza | (A.Gray) Parry ex S.Watson | Montiaceae | 8 |
| Claytonia nevadensis | S.Watson | Montiaceae | 8 |
| Claytonia palustris | Swanson & Kelley | Montiaceae | 8 |
| Claytonia parviflora | Douglas | Montiaceae | 8 |
| Claytonia perfoliata | Donn ex Willd. | Montiaceae | 8 |
| Claytonia rubra | (Howell) Tidestr. | Montiaceae | 8 |
| Claytonia saxosa | Brandegee | Montiaceae | 8 |
| Claytonia sibirica | L. | Montiaceae | 8 |
| Claytonia umbellata | S.Watson | Montiaceae | 8 |
| Clematis drummondii | Torr. & A.Gray | Ranunculaceae | 8 |
| Clematis lasiantha | Nutt. | Ranunculaceae | 8 |
| Clematis ligusticifolia | Nutt. | Ranunculaceae | 8 |
| Clematis pauciflora | Nutt. ex Torr. & A.Gray | Ranunculaceae | 8 |
| Cleome dodecandra | L. | Cleomaceae | 8 |
| Cleomella arborea | (Nutt.) Roalson & J.C.Hall | Cleomaceae | 8 |
| Cleomella hillmanii | A.Nelson | Cleomaceae | 8 |
| Cleomella lutea | (Hook.) Roalson & J.C.Hall | Cleomaceae | 8 |
| Cleomella obtusifolia | Torr. & Frém. | Cleomaceae | 8 |
| Cleomella oxystyloides | Roalson, J.C.Hall & Riser | Cleomaceae | 8 |
| Cleomella palmeri | (A.Gray) J.C.Hall & Roalson | Cleomaceae | 8 |
| Cleomella parviflora | A.Gray | Cleomaceae | 8 |
| Cleomella platycarpa | (Torr.) Roalson & J.C.Hall | Cleomaceae | 8 |
| Cleomella plocasperma | S.Watson | Cleomaceae | 8 |
| Cleomella refracta | (Engelm.) J.C.Hall & Roalson | Cleomaceae | 8 |
| Cleomella serrulata | (Pursh) Roalson & J.C.Hall | Cleomaceae | 8 |
| Cleomella sparsifolia | (S.Watson) J.C.Hall & Roalson | Cleomaceae | 8 |
| Clinopodium chandleri | (Brandegee) P.D.Cantino & Wagstaff | Lamiaceae | 8 |
| Clinopodium mimuloides | (Benth.) Kuntze | Lamiaceae | 8 |
| Clintonia andrewsiana | Torr. | Liliaceae | 8 |
| Clintonia uniflora | (Menzies ex Schult. & Schult.f.) Kunth | Liliaceae | 8 |
| Cneoridium dumosum | Hook.f. | Rutaceae | 8 |
| Cochemiea dioica | (K.Brandegee) Doweld | Cactaceae | 8 |
| Cochemiea grahamii | (Engelm.) Doweld | Cactaceae | 8 |
| Cochlearia groenlandica | L. | Brassicaceae | 8 |
| Coleataenia rigidula | (Bosc ex Nees) LeBlond | Poaceae | 8 |
| Coleogyne ramosissima | Torr. | Rosaceae | 8 |
| Collinsia bartsiifolia | Benth. | Plantaginaceae | 8 |
| Collinsia callosa | Parish | Plantaginaceae | 8 |
| Collinsia childii | Parry ex A.Gray | Plantaginaceae | 8 |
| Collinsia concolor | Greene | Plantaginaceae | 8 |
| Collinsia grandiflora | Douglas ex Lindl. | Plantaginaceae | 8 |
| Collinsia greenei | A.Gray | Plantaginaceae | 8 |
| Collinsia heterophylla | Buist ex Graham | Plantaginaceae | 8 |
| Collinsia linearis | A.Gray | Plantaginaceae | 8 |
| Collinsia multicolor | Lindl. & Paxton | Plantaginaceae | 8 |
| Collinsia parryi | A.Gray | Plantaginaceae | 8 |
| Collinsia parviflora | Douglas ex Lindl. | Plantaginaceae | 8 |
| Collinsia rattanii | A.Gray | Plantaginaceae | 8 |
| Collinsia sparsiflora | Fisch. & C.A.Mey. | Plantaginaceae | 8 |
| Collinsia tinctoria | Hartw. ex Benth. | Plantaginaceae | 8 |
| Collinsia torreyi | A.Gray | Plantaginaceae | 8 |
| Collomia diversifolia | Greene | Polemoniaceae | 8 |
| Collomia grandiflora | Douglas ex Lindl. | Polemoniaceae | 8 |
| Collomia heterophylla | Hook. | Polemoniaceae | 8 |
| Collomia larsenii | Payson | Polemoniaceae | 8 |
| Collomia linearis | Nutt. | Polemoniaceae | 8 |
| Collomia tinctoria | Kellogg | Polemoniaceae | 8 |
| Collomia tracyi | H.Mason | Polemoniaceae | 8 |
| Colubrina californica | I.M.Johnst. | Rhamnaceae | 8 |
| Comandra umbellata | (L.) Nutt. | Santalaceae | 8 |
| Comarostaphylis diversifolia | (Parry) Greene | Ericaceae | 8 |
| Comarum palustre | L. | Rosaceae | 8 |
| Comastoma tenellum | (Rottb.) Toyok. | Gentianaceae | 8 |
| Condalia globosa | I.M.Johnst. | Rhamnaceae | 8 |
| Condea emoryi | (Torr.) Harley & J.F.B.Pastore | Lamiaceae | 8 |
| Conioselinum chinense | (L.) Britton, Sterns & Poggenb. | Apiaceae | 8 |
| Conioselinum tataricum | Hoffm. | Apiaceae | 8 |
| Constancea nevinii | (A.Gray) B.G.Baldwin | Asteraceae | 8 |
| Convolvulus collinus | Greene | Convolvulaceae | 8 |
| Convolvulus simulans | L.M.Perry | Convolvulaceae | 8 |
| Convolvulus stebbinsii | (Brummitt) S.C.Nepom. & Buril | Convolvulaceae | 8 |
| Coptis laciniata | A.Gray | Ranunculaceae | 8 |
| Corallorhiza maculata | Raf. | Orchidaceae | 8 |
| Corallorhiza mertensiana | Bong. | Orchidaceae | 8 |
| Corallorhiza striata | Lindl. | Orchidaceae | 8 |
| Corallorhiza trifida | Châtel. | Orchidaceae | 8 |
| Cordylanthus capitatus | Nutt. ex Benth. | Orobanchaceae | 8 |
| Cordylanthus nevinii | A.Gray | Orobanchaceae | 8 |
| Cordylanthus nidularius | J.T.Howell | Orobanchaceae | 8 |
| Cordylanthus pringlei | A.Gray | Orobanchaceae | 8 |
| Cordylanthus ramosus | Nutt. ex Benth. | Orobanchaceae | 8 |
| Cordylanthus rigidus | (Benth.) Jeps. | Orobanchaceae | 8 |
| Cordylanthus tenuis | A.Gray | Orobanchaceae | 8 |
| Coreopsis californica | (Nutt.) H.Sharsm. | Asteraceae | 8 |
| Coreopsis calliopsidea | (DC.) A.Gray | Asteraceae | 8 |
| Coreopsis douglasii | (DC.) H.M.Hall | Asteraceae | 8 |
| Coreopsis gigantea | (Kellogg) H.M.Hall | Asteraceae | 8 |
| Coreopsis hamiltonii | (Elmer) H.Sharsm. | Asteraceae | 8 |
| Coreopsis maritima | Hook.f. | Asteraceae | 8 |
| Coreopsis stillmanii | (A.Gray) S.F.Blake | Asteraceae | 8 |
| Coreopsis tinctoria | Nutt. | Asteraceae | 8 |
| Corethrogyne filaginifolia | (Hook. & Arn.) Nutt. | Asteraceae | 8 |
| Cornus glabrata | Benth. | Cornaceae | 8 |
| Cornus nuttallii | Audubon ex Torr. & A.Gray | Cornaceae | 8 |
| Cornus sericea | L. | Cornaceae | 8 |
| Cornus sessilis | Torr. | Cornaceae | 8 |
| Corydalis aurea | Willd. | Papaveraceae | 8 |
| Corydalis caseana | A.Gray | Papaveraceae | 8 |
| Corylus cornuta | Marshall | Betulaceae | 8 |
| Crassula aquatica | (L.) Schönland | Crassulaceae | 8 |
| Crassula connata | A.Berger | Crassulaceae | 8 |
| Crataegus douglasii | Lindl. | Rosaceae | 8 |
| Crataegus gaylussacia | A.Heller | Rosaceae | 8 |
| Crepis acuminata | Nutt. | Asteraceae | 8 |
| Crepis intermedia | A.Gray | Asteraceae | 8 |
| Crepis occidentalis | Nutt. | Asteraceae | 8 |
| Cressa truxillensis | Kunth | Convolvulaceae | 8 |
| Crocanthemum aldersonii | (Greene) Janch. | Cistaceae | 8 |
| Crocanthemum scoparium | (Nutt.) Millsp. | Cistaceae | 8 |
| Crocidium multicaule | Hook. | Asteraceae | 8 |
| Crossosoma bigelovii | S.Watson | Crossosomataceae | 8 |
| Crossosoma californicum | Nutt. | Crossosomataceae | 8 |
| Croton californicus | Müll.Arg. | Euphorbiaceae | 8 |
| Croton wigginsii | L.C.Wheeler | Euphorbiaceae | 8 |
| Crucihimalaya virgata | (Nutt.) D.A.German & A.L.Ebel | Brassicaceae | 8 |
| Cryptantha ambigua | (A.Gray) Greene | Boraginaceae | 8 |
| Cryptantha barbigera | (A.Gray) Greene | Boraginaceae | 8 |
| Cryptantha crassisepala | (Torr. & A.Gray) Greene | Boraginaceae | 8 |
| Cryptantha dumetorum | (Greene ex A.Gray) Greene | Boraginaceae | 8 |
| Cryptantha flaccida | (Douglas ex Lehm.) Greene | Boraginaceae | 8 |
| Cryptantha gracilis | Osterh. | Boraginaceae | 8 |
| Cryptantha intermedia | (A.Gray) Greene | Boraginaceae | 8 |
| Cryptantha leiocarpa | (Fisch. & C.A.Mey.) Greene | Boraginaceae | 8 |
| Cryptantha maritima | (Greene) Greene | Boraginaceae | 8 |
| Cryptantha micromeres | (A.Gray) Greene | Boraginaceae | 8 |
| Cryptantha microstachys | Greene | Boraginaceae | 8 |
| Cryptantha nevadensis | A.Nelson & P.B.Kenn. | Boraginaceae | 8 |
| Cryptantha pterocarya | (Torr.) Greene | Boraginaceae | 8 |
| Cryptantha recurvata | Coville | Boraginaceae | 8 |
| Cryptantha scoparia | A.Nelson | Boraginaceae | 8 |
| Cryptantha utahensis | (A.Gray) Greene | Boraginaceae | 8 |
| Cryptogramma acrostichoides | R.Br. | Pteridaceae | 8 |
| Cryptogramma cascadensis | E.R.Alverson | Pteridaceae | 8 |
| Cucurbita digitata | A.Gray | Cucurbitaceae | 8 |
| Cucurbita foetidissima | Kunth | Cucurbitaceae | 8 |
| Cucurbita palmata | S.Watson | Cucurbitaceae | 8 |
| Cuniculotinus gramineus | (H.M.Hall) Urbatsch, R.P.Roberts & Neubig | Asteraceae | 8 |
| Cuscuta californica | Hook. & Arn. | Convolvulaceae | 8 |
| Cuscuta campestris | Yunck. | Convolvulaceae | 8 |
| Cuscuta cephalanthi | Engelm. | Convolvulaceae | 8 |
| Cuscuta denticulata | Engelm. | Convolvulaceae | 8 |
| Cuscuta indecora | Choisy | Convolvulaceae | 8 |
| Cuscuta pacifica | Costea & M.A.R.Wright | Convolvulaceae | 8 |
| Cuscuta subinclusa | Durand & Hilg. | Convolvulaceae | 8 |
| Cusickiella douglasii | (A.Gray) Rollins | Brassicaceae | 8 |
| Cusickiella quadricostata | (Rollins) Rollins | Brassicaceae | 8 |
| Cycladenia humilis | Benth. | Apocynaceae | 8 |
| Cylindropuntia acanthocarpa | (Engelm. & J.M.Bigelow) F.M.Knuth | Cactaceae | 8 |
| Cylindropuntia bigelovii | (Engelm.) F.M.Knuth | Cactaceae | 8 |
| Cylindropuntia californica | (Torr. & A.Gray) F.M.Knuth | Cactaceae | 8 |
| Cylindropuntia chuckwallensis | M.A.Baker & Cloud-H. | Cactaceae | 8 |
| Cylindropuntia echinocarpa | (Engelm. & J.M.Bigelow) F.M.Knuth | Cactaceae | 8 |
| Cylindropuntia ganderi | (C.B.Wolf) Rebman & Pinkava | Cactaceae | 8 |
| Cylindropuntia munzii | (C.B.Wolf) Backeb. | Cactaceae | 8 |
| Cylindropuntia prolifera | (Engelm.) F.M.Knuth | Cactaceae | 8 |
| Cylindropuntia ramosissima | (Engelm.) F.M.Knuth | Cactaceae | 8 |
| Cylindropuntia whipplei | (Engelm. & J.M.Bigelow) F.M.Knuth | Cactaceae | 8 |
| Cylindropuntia wolfii | (L.D.Benson) M.A.Baker | Cactaceae | 8 |
| Cymopterus aboriginum | M.E.Jones | Apiaceae | 8 |
| Cymopterus cinerarius | A.Gray | Apiaceae | 8 |
| Cymopterus deserticola | Brandegee | Apiaceae | 8 |
| Cymopterus gilmanii | C.V.Morton | Apiaceae | 8 |
| Cymopterus globosus | (S.Watson) S.Watson | Apiaceae | 8 |
| Cymopterus petraeus | M.E.Jones | Apiaceae | 8 |
| Cymopterus ripleyi | Barneby | Apiaceae | 8 |
| Cymopterus terebinthinus | (Hook.) Torr. & A.Gray | Apiaceae | 8 |
| Cyperus acuminatus | Torr. & Hook. | Cyperaceae | 8 |
| Cyperus bipartitus | Torr. | Cyperaceae | 8 |
| Cyperus eragrostis | Lam. | Cyperaceae | 8 |
| Cyperus esculentus | L. | Cyperaceae | 8 |
| Cyperus flavescens | L. | Cyperaceae | 8 |
| Cyperus laevigatus | L. | Cyperaceae | 8 |
| Cyperus melanostachyus | Kunth | Cyperaceae | 8 |
| Cyperus odoratus | L. | Cyperaceae | 8 |
| Cyperus squarrosus | L. | Cyperaceae | 8 |
| Cyperus strigosus | L. | Cyperaceae | 8 |
| Cyperus subsquarrosus | (Muhl.) Bauters | Cyperaceae | 8 |
| Cypripedium californicum | A.Gray | Orchidaceae | 8 |
| Cypripedium fasciculatum | Kellogg | Orchidaceae | 8 |
| Cypripedium montanum | Douglas ex Lindl. | Orchidaceae | 8 |
| Cystopteris fragilis | (L.) Bernh. | Cystopteridaceae | 8 |
| Dalea mollis | Benth. | Fabaceae | 8 |
| Dalea mollissima | (Rydb.) Munz | Fabaceae | 8 |
| Dalea ornata | (Douglas ex Hook.) Eaton & Wright | Fabaceae | 8 |
| Dalea searlsiae | (A.Gray) Barneby | Fabaceae | 8 |
| Damasonium californicum | Torr. | Alismataceae | 8 |
| Danthonia californica | Bol. | Poaceae | 8 |
| Danthonia intermedia | Vasey | Poaceae | 8 |
| Danthonia unispicata | (Thurb.) Munro ex Macoun | Poaceae | 8 |
| Darlingtonia californica | Torr. | Sarraceniaceae | 8 |
| Darmera peltata | (Torr. ex Benth.) Voss | Saxifragaceae | 8 |
| Dasiphora fruticosa | (L.) Rydb. | Rosaceae | 8 |
| Datisca glomerata | (C.Presl) Baill. | Datiscaceae | 8 |
| Datura discolor | Bernh. | Solanaceae | 8 |
| Daucus pusillus | Michx. | Apiaceae | 8 |
| Dedeckera eurekensis | Reveal & J.T.Howell | Polygonaceae | 8 |
| Deinandra arida | (D.D.Keck) B.G.Baldwin | Asteraceae | 8 |
| Deinandra bacigalupii | B.G.Baldwin | Asteraceae | 8 |
| Deinandra clementina | (Brandegee) B.G.Baldwin | Asteraceae | 8 |
| Deinandra conjugens | (D.D.Keck) B.G.Baldwin | Asteraceae | 8 |
| Deinandra corymbosa | (DC.) B.G.Baldwin | Asteraceae | 8 |
| Deinandra fasciculata | (DC.) Greene | Asteraceae | 8 |
| Deinandra floribunda | Davidson & Moxley | Asteraceae | 8 |
| Deinandra increscens | (H.M.Hall ex D.D.Keck) B.G.Baldwin | Asteraceae | 8 |
| Deinandra kelloggii | Greene | Asteraceae | 8 |
| Deinandra lobbii | (Greene) Greene | Asteraceae | 8 |
| Deinandra minthornii | (Jeps.) B.G.Baldwin | Asteraceae | 8 |
| Deinandra pallida | (D.D.Keck) B.G.Baldwin | Asteraceae | 8 |
| Deinandra paniculata | Davidson & Moxley | Asteraceae | 8 |
| Deinandra pentactis | (D.D.Keck) B.G.Baldwin | Asteraceae | 8 |
| Delphinium andersonii | A.Gray | Ranunculaceae | 8 |
| Delphinium antoninum | Eastw. | Ranunculaceae | 8 |
| Delphinium californicum | Torr. & A.Gray | Ranunculaceae | 8 |
| Delphinium cardinale | Hook. | Ranunculaceae | 8 |
| Delphinium decorum | Fisch. & C.A.Mey. | Ranunculaceae | 8 |
| Delphinium glaucum | S.Watson | Ranunculaceae | 8 |
| Delphinium gypsophilum | Ewan | Ranunculaceae | 8 |
| Delphinium hansenii | (Greene) Greene | Ranunculaceae | 8 |
| Delphinium hesperium | A.Gray | Ranunculaceae | 8 |
| Delphinium hutchinsoniae | Ewan | Ranunculaceae | 8 |
| Delphinium nudicaule | Torr. & A.Gray | Ranunculaceae | 8 |
| Delphinium nuttallianum | Pritz. | Ranunculaceae | 8 |
| Delphinium parishii | A.Gray | Ranunculaceae | 8 |
| Delphinium parryi | A.Gray | Ranunculaceae | 8 |
| Delphinium patens | Benth. | Ranunculaceae | 8 |
| Delphinium polycladon | Eastw. | Ranunculaceae | 8 |
| Delphinium purpusii | Brandegee | Ranunculaceae | 8 |
| Delphinium recurvatum | Greene | Ranunculaceae | 8 |
| Delphinium trolliifolium | A.Gray | Ranunculaceae | 8 |
| Delphinium umbraculorum | F.H.Lewis & Epling | Ranunculaceae | 8 |
| Delphinium variegatum | Torr. & A.Gray | Ranunculaceae | 8 |
| Dendromecon harfordii | Kellogg | Papaveraceae | 8 |
| Dendromecon rigida | Benth. | Papaveraceae | 8 |
| Deschampsia danthonioides | (Trin.) Benth. | Poaceae | 8 |
| Deschampsia elongata | (Hook.) Munro | Poaceae | 8 |
| Descurainia californica | (A.Gray) O.E.Schulz | Brassicaceae | 8 |
| Descurainia incana | (Bernh. ex Fisch. & C.A.Mey.) Dorn | Brassicaceae | 8 |
| Descurainia incisa | (Engelm.) Britton | Brassicaceae | 8 |
| Descurainia pinnata | (Walter) Britton | Brassicaceae | 8 |
| Dicentra formosa | (Haw.) Walp. | Papaveraceae | 8 |
| Dicentra nevadensis | Eastw. | Papaveraceae | 8 |
| Dicentra pauciflora | S.Watson | Papaveraceae | 8 |
| Dicentra uniflora | Kellogg | Papaveraceae | 8 |
| Dichanthelium implicatum | (Scribn.) Kerguélen | Poaceae | 8 |
| Dichanthelium lanuginosum | (Elliott) Gould | Poaceae | 8 |
| Dichelostemma capitatum | (Benth.) Alph.Wood | Asparagaceae | 8 |
| Dichelostemma congestum | (Sm.) Kunth | Asparagaceae | 8 |
| Dichelostemma ida-maia | (Alph.Wood) Greene | Asparagaceae | 8 |
| Dichelostemma multiflorum | (Benth.) A.Heller | Asparagaceae | 8 |
| Dichelostemma volubile | (Kellogg) A.Heller | Asparagaceae | 8 |
| Dichondra donelliana | Tharp & M.C.Johnst. | Convolvulaceae | 8 |
| Dichondra occidentalis | House | Convolvulaceae | 8 |
| Dicoria canescens | A.Gray | Asteraceae | 8 |
| Dicranostegia orcuttiana | (A.Gray) Pennell | Orobanchaceae | 8 |
| Dieteria asteroides | Torr. | Asteraceae | 8 |
| Dieteria canescens | (Pursh) Nutt. | Asteraceae | 8 |
| Diplachne fusca | (L.) P.Beauv. | Poaceae | 8 |
| Diplacus angustatus | (A.Gray) G.L.Nesom | Phrymaceae | 8 |
| Diplacus aurantiacus | (Curtis) Jeps. | Phrymaceae | 8 |
| Diplacus bicolor | (A.Gray) Hrusa | Phrymaceae | 8 |
| Diplacus bigelovii | (A.Gray) G.L.Nesom | Phrymaceae | 8 |
| Diplacus bolanderi | (A.Gray) G.L.Nesom | Phrymaceae | 8 |
| Diplacus brevipes | (Benth.) G.L.Nesom | Phrymaceae | 8 |
| Diplacus calycinus | Eastw. | Phrymaceae | 8 |
| Diplacus clevelandii | (Brandegee) Greene | Phrymaceae | 8 |
| Diplacus congdonii | (B.L.Rob.) G.L.Nesom | Phrymaceae | 8 |
| Diplacus constrictus | (A.L.Grant) G.L.Nesom | Phrymaceae | 8 |
| Diplacus cusickioides | G.L.Nesom | Phrymaceae | 8 |
| Diplacus douglasii | (Benth.) G.L.Nesom | Phrymaceae | 8 |
| Diplacus fremontii | (Benth.) G.L.Nesom | Phrymaceae | 8 |
| Diplacus grandiflorus | (Lindl.) Groenland | Phrymaceae | 8 |
| Diplacus graniticola | Schoenig | Phrymaceae | 8 |
| Diplacus jepsonii | (A.L.Grant) G.L.Nesom | Phrymaceae | 8 |
| Diplacus johnstonii | (A.L.Grant) G.L.Nesom | Phrymaceae | 8 |
| Diplacus kelloggii | (Curran ex Greene) G.L.Nesom | Phrymaceae | 8 |
| Diplacus layneae | (Greene) G.L.Nesom | Phrymaceae | 8 |
| Diplacus leptaleus | (A.Gray) G.L.Nesom | Phrymaceae | 8 |
| Diplacus linearis | (Benth.) Greene | Phrymaceae | 8 |
| Diplacus longiflorus | Nutt. | Phrymaceae | 8 |
| Diplacus mephiticus | (Greene) G.L.Nesom | Phrymaceae | 8 |
| Diplacus mohavensis | (Lemmon) G.L.Nesom | Phrymaceae | 8 |
| Diplacus nanus | (Hook. & Arn.) G.L.Nesom | Phrymaceae | 8 |
| Diplacus parryi | (A.Gray) G.L.Nesom & N.S.Fraga | Phrymaceae | 8 |
| Diplacus parviflorus | Greene | Phrymaceae | 8 |
| Diplacus pictus | (Greene) G.L.Nesom | Phrymaceae | 8 |
| Diplacus pulchellus | (Drew ex Greene) G.L.Nesom | Phrymaceae | 8 |
| Diplacus puniceus | Nutt. | Phrymaceae | 8 |
| Diplacus rattanii | (A.Gray) G.L.Nesom | Phrymaceae | 8 |
| Diplacus rupicola | (Coville & A.L.Grant) G.L.Nesom & N.S.Fraga | Phrymaceae | 8 |
| Diplacus torreyi | (A.Gray) G.L.Nesom | Phrymaceae | 8 |
| Diplacus tricolor | (Hartw. ex Lindl.) G.L.Nesom | Phrymaceae | 8 |
| Diplacus vandenbergensis | (D.M.Thomps.) G.L.Nesom | Phrymaceae | 8 |
| Dirca occidentalis | A.Gray | Thymelaeaceae | 8 |
| Distichlis littoralis | (Engelm.) H.L.Bell & Columbus | Poaceae | 8 |
| Distichlis spicata | (L.) Greene | Poaceae | 8 |
| Ditaxis lanceolata | (Benth.) Pax & K.Hoffm. | Euphorbiaceae | 8 |
| Ditaxis serrata | (Torr.) A.Heller | Euphorbiaceae | 8 |
| Dithyrea californica | Harv. | Brassicaceae | 8 |
| Dithyrea maritima | (Davidson) Davidson | Brassicaceae | 8 |
| Downingia bacigalupii | Weiler | Campanulaceae | 8 |
| Downingia bella | Hoover | Campanulaceae | 8 |
| Downingia bicornuta | A.Gray | Campanulaceae | 8 |
| Downingia concolor | Greene | Campanulaceae | 8 |
| Downingia cuspidata | (Greene) Rattan | Campanulaceae | 8 |
| Downingia elegans | (Douglas ex Lindl.) Torr. | Campanulaceae | 8 |
| Downingia insignis | Greene | Campanulaceae | 8 |
| Downingia ornatissima | Greene | Campanulaceae | 8 |
| Downingia pulchella | Torr. | Campanulaceae | 8 |
| Downingia pusilla | (G.Don) Torr. | Campanulaceae | 8 |
| Downingia yina | Applegate | Campanulaceae | 8 |
| Draba albertina | Greene | Brassicaceae | 8 |
| Draba aureola | S.Watson | Brassicaceae | 8 |
| Draba breweri | S.Watson | Brassicaceae | 8 |
| Draba cana | Rydb. | Brassicaceae | 8 |
| Draba carnosula | O.E.Schulz | Brassicaceae | 8 |
| Draba densifolia | Nutt. | Brassicaceae | 8 |
| Draba howellii | S.Watson | Brassicaceae | 8 |
| Draba lemmonii | S.Watson | Brassicaceae | 8 |
| Draba lonchocarpa | Rydb. | Brassicaceae | 8 |
| Draba monoensis | Rollins & R.A.Price | Brassicaceae | 8 |
| Draba nemorosa | L. | Brassicaceae | 8 |
| Draba novolympica | Payson & H.St.John | Brassicaceae | 8 |
| Draba oligosperma | Hook. | Brassicaceae | 8 |
| Draba praealta | Greene | Brassicaceae | 8 |
| Draba subumbellata | Rollins & R.A.Price | Brassicaceae | 8 |
| Draperia systyla | (A.Gray) Torr. | Hydrophyllaceae | 8 |
| Drosera anglica | Huds. | Droseraceae | 8 |
| Drosera rotundifolia | L. | Droseraceae | 8 |
| Drymocallis glandulosa | (Lindl.) Rydb. | Rosaceae | 8 |
| Dryopteris expansa | (C.Presl) Fraser-Jenk. & Jermy | Dryopteridaceae | 8 |
| Dryopteris filix-mas | (L.) Schott | Dryopteridaceae | 8 |
| Dudleya abramsii | Rose | Crassulaceae | 8 |
| Dudleya arizonica | Rose | Crassulaceae | 8 |
| Dudleya attenuata | (S.Watson) Moran | Crassulaceae | 8 |
| Dudleya brevifolia | (Moran) Moran | Crassulaceae | 8 |
| Dudleya candelabrum | Rose | Crassulaceae | 8 |
| Dudleya cymosa | (Lem.) Britton & Rose | Crassulaceae | 8 |
| Dudleya densiflora | (Rose) Moran | Crassulaceae | 8 |
| Dudleya edulis | (Nutt.) Moran | Crassulaceae | 8 |
| Dudleya farinosa | Britton & Rose | Crassulaceae | 8 |
| Dudleya greenei | Rose | Crassulaceae | 8 |
| Dudleya lanceolata | (Nutt.) Britton & Rose | Crassulaceae | 8 |
| Dudleya multicaulis | (Rose) Moran | Crassulaceae | 8 |
| Dudleya nesiotica | Moran | Crassulaceae | 8 |
| Dudleya palmeri | (S.Watson) Britton & Rose | Crassulaceae | 8 |
| Dudleya parva | Rose & Davidson | Crassulaceae | 8 |
| Dudleya pulverulenta | (Nutt.) Britton & Rose | Crassulaceae | 8 |
| Dudleya saxosa | (M.E.Jones) Britton & Rose | Crassulaceae | 8 |
| Dudleya traskiae | (Rose) Moran | Crassulaceae | 8 |
| Dudleya variegata | (S.Watson) Moran | Crassulaceae | 8 |
| Dudleya verityi | K.M.Nakai | Crassulaceae | 8 |
| Dudleya virens | (Rose) Moran | Crassulaceae | 8 |
| Dudleya viscida | (S.Watson) Moran | Crassulaceae | 8 |
| Dulichium arundinaceum | (L.) Britton | Cyperaceae | 8 |
| Dyssodia papposa | (Vent.) Hitchc. | Asteraceae | 8 |
| Eastwoodia elegans | Brandegee | Asteraceae | 8 |
| Eatonella nivea | A.Gray | Asteraceae | 8 |
| Echinocereus engelmannii | (Parry ex Engelm.) Lem. | Cactaceae | 8 |
| Echinochloa muricata | (P.Beauv.) Fernald | Poaceae | 8 |
| Echinodorus berteroi | (Spreng.) Fassett | Alismataceae | 8 |
| Eclipta prostrata | (L.) L. | Asteraceae | 8 |
| Ehrendorferia chrysantha | (Hook. & Arn.) Rylander | Papaveraceae | 8 |
| Ehrendorferia ochroleuca | (Engelm.) Fukuhara | Papaveraceae | 8 |
| Elaeagnus commutata | Bernh. ex Rydb. | Elaeagnaceae | 8 |
| Elatine americana | (Pursh) Arn. | Elatinaceae | 8 |
| Elatine brachysperma | A.Gray | Elatinaceae | 8 |
| Eleocharis acicularis | (L.) Roem. & Schult. | Cyperaceae | 8 |
| Eleocharis atropurpurea | (Retz.) J.Presl & C.Presl | Cyperaceae | 8 |
| Eleocharis engelmannii | Steud. | Cyperaceae | 8 |
| Eleocharis equisetoides | (Elliott) Torr. | Cyperaceae | 8 |
| Eleocharis geniculata | (L.) Roem. & Schult. | Cyperaceae | 8 |
| Eleocharis macrostachya | Britton | Cyperaceae | 8 |
| Eleocharis montevidensis | Kunth | Cyperaceae | 8 |
| Eleocharis obtusa | (Willd.) Schult. | Cyperaceae | 8 |
| Eleocharis palustris | (L.) Roem. & Schult. | Cyperaceae | 8 |
| Eleocharis parvula | (Roem. & Schult.) Link ex Bluff, Nees & Schauer | Cyperaceae | 8 |
| Eleocharis quinqueflora | (Hartmann) O.Schwarz | Cyperaceae | 8 |
| Eleocharis rostellata | (Torr.) Torr. | Cyperaceae | 8 |
| Elodea canadensis | Michx. | Hydrocharitaceae | 8 |
| Elodea nuttallii | (Planch.) H.St.John | Hydrocharitaceae | 8 |
| Elymus californicus | (Bol. ex Thurb.) Gould | Poaceae | 8 |
| Elymus canadensis | L. | Poaceae | 8 |
| Elymus elymoides | (Raf.) Swezey | Poaceae | 8 |
| Elymus glaucus | Buckley | Poaceae | 8 |
| Elymus lanceolatus | (Scribn. & J.G.Sm.) Gould | Poaceae | 8 |
| Elymus longifolius | (J.G.Sm.) Gould | Poaceae | 8 |
| Elymus multisetus | (J.G.Sm.) Burtt Davy | Poaceae | 8 |
| Elymus scribneri | (Vasey) M.E.Jones | Poaceae | 8 |
| Elymus smithii | (Rydb.) Gould | Poaceae | 8 |
| Elymus violaceus | (Hornem.) J.Feilberg | Poaceae | 8 |
| Emmenanthe penduliflora | Benth. | Hydrophyllaceae | 8 |
| Empetrum nigrum | L. | Ericaceae | 8 |
| Encelia actoni | Elmer | Asteraceae | 8 |
| Encelia californica | Nutt. | Asteraceae | 8 |
| Encelia farinosa | A.Gray ex Torr. | Asteraceae | 8 |
| Encelia frutescens | A.Gray | Asteraceae | 8 |
| Encelia virginensis | A.Nelson | Asteraceae | 8 |
| Enceliopsis covillei | S.F.Blake | Asteraceae | 8 |
| Enceliopsis nudicaulis | A.Nelson | Asteraceae | 8 |
| Enemion occidentale | (Hook. & Arn.) J.R.Drumm. & Hutch. | Ranunculaceae | 8 |
| Enneapogon desvauxii | P.Beauv. | Poaceae | 8 |
| Ephedra aspera | Engelm. ex S.Watson | Ephedraceae | 8 |
| Ephedra californica | S.Watson | Ephedraceae | 8 |
| Ephedra nevadensis | S.Watson | Ephedraceae | 8 |
| Ephedra trifurca | Torr. ex S.Watson | Ephedraceae | 8 |
| Ephedra viridis | Coville | Ephedraceae | 8 |
| Epilobium anagallidifolium | Lam. | Onagraceae | 8 |
| Epilobium angustifolium | L. | Onagraceae | 8 |
| Epilobium brachycarpum | C.Presl | Onagraceae | 8 |
| Epilobium canum | (Greene) P.H.Raven | Onagraceae | 8 |
| Epilobium ciliatum | Raf. | Onagraceae | 8 |
| Epilobium clavatum | Trel. | Onagraceae | 8 |
| Epilobium densiflorum | (Lindl.) Hoch & P.H.Raven | Onagraceae | 8 |
| Epilobium hornemannii | Rchb. | Onagraceae | 8 |
| Epilobium howellii | Hoch | Onagraceae | 8 |
| Epilobium lactiflorum | Hausskn. | Onagraceae | 8 |
| Epilobium latifolium | L. | Onagraceae | 8 |
| Epilobium leptophyllum | Raf. | Onagraceae | 8 |
| Epilobium luteum | Pursh | Onagraceae | 8 |
| Epilobium minutum | Lindl. | Onagraceae | 8 |
| Epilobium obcordatum | A.Gray | Onagraceae | 8 |
| Epilobium oreganum | Greene | Onagraceae | 8 |
| Epilobium palustre | L. | Onagraceae | 8 |
| Epilobium siskiyouense | (Munz) Hoch & P.H.Raven | Onagraceae | 8 |
| Epipactis gigantea | Douglas | Orchidaceae | 8 |
| Epixiphium wislizeni | (Engelm. ex A.Gray) Munz | Plantaginaceae | 8 |
| Equisetum arvense | L. | Equisetaceae | 8 |
| Equisetum hyemale | L. | Equisetaceae | 8 |
| Equisetum laevigatum | A.Braun | Equisetaceae | 8 |
| Equisetum palustre | L. | Equisetaceae | 8 |
| Eragrostis hypnoides | (Lam.) Britton, Sterns & Poggenb. | Poaceae | 8 |
| Eragrostis intermedia | Hitchc. | Poaceae | 8 |
| Eragrostis pectinacea | (Michx.) Nees | Poaceae | 8 |
| Eremalche exilis | (A.Gray) Greene | Malvaceae | 8 |
| Eremalche parryi | (Greene) Greene | Malvaceae | 8 |
| Eremalche rotundifolia | (A.Gray) Greene | Malvaceae | 8 |
| Eremocarya lepida | (A.Gray) Greene | Boraginaceae | 8 |
| Eremocarya micrantha | (Torr.) Greene | Boraginaceae | 8 |
| Eremogone aculeata | (S.Watson) Ikonn. | Caryophyllaceae | 8 |
| Eremogone congesta | (Nutt.) Ikonn. | Caryophyllaceae | 8 |
| Eremogone ferrisiae | (Abrams) R.L.Hartm. & Rabeler | Caryophyllaceae | 8 |
| Eremogone kingii | (S.Watson) Ikonn. | Caryophyllaceae | 8 |
| Eremogone macradenia | (S.Watson) Ikonn. | Caryophyllaceae | 8 |
| Eremothera boothii | (Douglas) W.L.Wagner & Hoch | Onagraceae | 8 |
| Eremothera chamaenerioides | (A.Gray) W.L.Wagner & Hoch | Onagraceae | 8 |
| Eremothera refracta | (S.Watson) W.L.Wagner & Hoch | Onagraceae | 8 |
| Eriastrum abramsii | (Elmer) H.Mason | Polemoniaceae | 8 |
| Eriastrum calocyanum | S.J.De Groot | Polemoniaceae | 8 |
| Eriastrum densifolium | (Benth.) H.Mason | Polemoniaceae | 8 |
| Eriastrum diffusum | (A.Gray) H.Mason | Polemoniaceae | 8 |
| Eriastrum eremicum | (Jeps.) H.Mason | Polemoniaceae | 8 |
| Eriastrum filifolium | (Nutt.) Wooton & Standl. | Polemoniaceae | 8 |
| Eriastrum harwoodii | (T.T.Craig) D.Gowen | Polemoniaceae | 8 |
| Eriastrum pluriflorum | (A.Heller) H.Mason | Polemoniaceae | 8 |
| Eriastrum rosamondense | D.Gowen | Polemoniaceae | 8 |
| Eriastrum sapphirinum | (Eastw.) H.Mason | Polemoniaceae | 8 |
| Eriastrum signatum | D.Gowen | Polemoniaceae | 8 |
| Eriastrum tracyi | H.Mason | Polemoniaceae | 8 |
| Eriastrum virgatum | (Benth.) H.Mason | Polemoniaceae | 8 |
| Eriastrum wilcoxii | (A.Nelson) H.Mason | Polemoniaceae | 8 |
| Ericameria albida | (M.E.Jones ex A.Gray) L.C.Anderson | Asteraceae | 8 |
| Ericameria arborescens | (A.Gray) Greene | Asteraceae | 8 |
| Ericameria bloomeri | J.F.Macbr. | Asteraceae | 8 |
| Ericameria brachylepis | H.M.Hall | Asteraceae | 8 |
| Ericameria cooperi | H.M.Hall | Asteraceae | 8 |
| Ericameria cuneata | McClatchie | Asteraceae | 8 |
| Ericameria discoidea | (Nutt.) G.L.Nesom | Asteraceae | 8 |
| Ericameria ericoides | (Less.) Nutt. ex Jeps. | Asteraceae | 8 |
| Ericameria gilmanii | (S.F.Blake) G.L.Nesom | Asteraceae | 8 |
| Ericameria greenei | (A.Gray) G.L.Nesom | Asteraceae | 8 |
| Ericameria laricifolia | (A.Gray) Shinners | Asteraceae | 8 |
| Ericameria linearifolia | (DC.) Urbatsch & Wussow | Asteraceae | 8 |
| Ericameria nana | Nutt. | Asteraceae | 8 |
| Ericameria nauseosa | (Pursh) G.L.Nesom & G.I.Baird | Asteraceae | 8 |
| Ericameria palmeri | (A.Gray) H.M.Hall | Asteraceae | 8 |
| Ericameria parishii | H.M.Hall | Asteraceae | 8 |
| Ericameria parryi | (A.Gray) G.L.Nesom & G.I.Baird | Asteraceae | 8 |
| Ericameria pinifolia | H.M.Hall | Asteraceae | 8 |
| Ericameria suffruticosa | (Nutt.) G.L.Nesom | Asteraceae | 8 |
| Ericameria teretifolia | Jeps. | Asteraceae | 8 |
| Erigeron aliceae | Howell | Asteraceae | 8 |
| Erigeron annuus | (L.) Desf. | Asteraceae | 8 |
| Erigeron aphanactis | Greene | Asteraceae | 8 |
| Erigeron blochmaniae | Greene | Asteraceae | 8 |
| Erigeron bloomeri | A.Gray | Asteraceae | 8 |
| Erigeron breweri | A.Gray | Asteraceae | 8 |
| Erigeron canadensis | L. | Asteraceae | 8 |
| Erigeron cervinus | Greene | Asteraceae | 8 |
| Erigeron compactus | S.F.Blake | Asteraceae | 8 |
| Erigeron compositus | Pursh | Asteraceae | 8 |
| Erigeron concinnus | Torr. & A.Gray | Asteraceae | 8 |
| Erigeron divergens | Torr. & A.Gray | Asteraceae | 8 |
| Erigeron eatonii | A.Gray | Asteraceae | 8 |
| Erigeron elegantulus | Greene | Asteraceae | 8 |
| Erigeron filifolius | Nutt. | Asteraceae | 8 |
| Erigeron flagellaris | A.Gray | Asteraceae | 8 |
| Erigeron foliosus | Nutt. | Asteraceae | 8 |
| Erigeron glacialis | (Nutt.) A.Nelson | Asteraceae | 8 |
| Erigeron glaucus | Ker Gawl. | Asteraceae | 8 |
| Erigeron inornatus | A.Gray | Asteraceae | 8 |
| Erigeron klamathensis | (G.L.Nesom) G.L.Nesom | Asteraceae | 8 |
| Erigeron linearis | (Hook.) Piper | Asteraceae | 8 |
| Erigeron lonchophyllus | Hook. | Asteraceae | 8 |
| Erigeron nivalis | Nutt. | Asteraceae | 8 |
| Erigeron petrophilus | Greene | Asteraceae | 8 |
| Erigeron philadelphicus | L. | Asteraceae | 8 |
| Erigeron pumilus | Nutt. | Asteraceae | 8 |
| Erigeron pygmaeus | Greene | Asteraceae | 8 |
| Erigeron strigosus | Muhl. ex Willd. | Asteraceae | 8 |
| Erigeron tener | A.Gray | Asteraceae | 8 |
| Erigeron utahensis | A.Gray | Asteraceae | 8 |
| Eriochloa contracta | Hitchc. | Poaceae | 8 |
| Eriocoma arida | (M.E.Jones) Romasch. | Poaceae | 8 |
| Eriocoma coronata | (Thurb.) Romasch. | Poaceae | 8 |
| Eriocoma hymenoides | (Roem. & Schult.) Rydb. | Poaceae | 8 |
| Eriocoma nelsonii | (Scribn.) Romasch. | Poaceae | 8 |
| Eriocoma occidentalis | (Thurb. ex S.Watson) Romasch. | Poaceae | 8 |
| Eriocoma parishii | (Vasey) Romasch. | Poaceae | 8 |
| Eriocoma pinetorum | (M.E.Jones) Romasch. | Poaceae | 8 |
| Eriocoma thurberiana | (Piper) Romasch. | Poaceae | 8 |
| Eriocoma webberi | Thurb. | Poaceae | 8 |
| Eriodictyon altissimum | P.V.Wells | Namaceae | 8 |
| Eriodictyon angustifolium | Nutt. | Namaceae | 8 |
| Eriodictyon californicum | (Hook. & Arn.) Torr. | Namaceae | 8 |
| Eriodictyon capitatum | Eastw. | Namaceae | 8 |
| Eriodictyon crassifolium | Benth. | Namaceae | 8 |
| Eriodictyon parryi | (A.Gray) Greene | Namaceae | 8 |
| Eriodictyon tomentosum | Benth. | Namaceae | 8 |
| Eriodictyon trichocalyx | A.Heller | Namaceae | 8 |
| Eriogonum alpinum | Engelm. | Polygonaceae | 8 |
| Eriogonum angulosum | Benth. | Polygonaceae | 8 |
| Eriogonum arborescens | Greene | Polygonaceae | 8 |
| Eriogonum argillosum | J.T.Howell | Polygonaceae | 8 |
| Eriogonum baileyi | S.Watson | Polygonaceae | 8 |
| Eriogonum brachypodum | Torr. & A.Gray | Polygonaceae | 8 |
| Eriogonum butterworthianum | J.T.Howell | Polygonaceae | 8 |
| Eriogonum caespitosum | Nutt. | Polygonaceae | 8 |
| Eriogonum callistum | Reveal | Polygonaceae | 8 |
| Eriogonum cedrorum | Reveal & Raiche | Polygonaceae | 8 |
| Eriogonum cernuum | Nutt. | Polygonaceae | 8 |
| Eriogonum cinereum | Benth. | Polygonaceae | 8 |
| Eriogonum cithariforme | S.Watson | Polygonaceae | 8 |
| Eriogonum clavatum | Small | Polygonaceae | 8 |
| Eriogonum compositum | Douglas ex Benth. | Polygonaceae | 8 |
| Eriogonum congdonii | (S.Stokes) Reveal | Polygonaceae | 8 |
| Eriogonum contiguum | (Reveal) Reveal | Polygonaceae | 8 |
| Eriogonum crocatum | Davidson | Polygonaceae | 8 |
| Eriogonum davidsonii | Greene | Polygonaceae | 8 |
| Eriogonum deflexum | Torr. | Polygonaceae | 8 |
| Eriogonum deserticola | S.Watson | Polygonaceae | 8 |
| Eriogonum douglasii | Benth. | Polygonaceae | 8 |
| Eriogonum elatum | Douglas ex Benth. | Polygonaceae | 8 |
| Eriogonum elegans | Greene | Polygonaceae | 8 |
| Eriogonum elongatum | Benth. | Polygonaceae | 8 |
| Eriogonum eremicola | J.T.Howell & Reveal | Polygonaceae | 8 |
| Eriogonum exaltatum | M.E.Jones | Polygonaceae | 8 |
| Eriogonum fasciculatum | Benth. | Polygonaceae | 8 |
| Eriogonum giganteum | S.Watson | Polygonaceae | 8 |
| Eriogonum gilmanii | S.Stokes | Polygonaceae | 8 |
| Eriogonum glandulosum | (Nutt.) Nutt. ex Benth. | Polygonaceae | 8 |
| Eriogonum gracile | Benth. | Polygonaceae | 8 |
| Eriogonum gracilipes | S.Watson | Polygonaceae | 8 |
| Eriogonum gracillimum | S.Watson | Polygonaceae | 8 |
| Eriogonum grande | Greene | Polygonaceae | 8 |
| Eriogonum heermannii | Durand & Hilg. | Polygonaceae | 8 |
| Eriogonum heracleoides | Nutt. | Polygonaceae | 8 |
| Eriogonum hirtiflorum | A.Gray ex S.Watson | Polygonaceae | 8 |
| Eriogonum hookeri | S.Watson | Polygonaceae | 8 |
| Eriogonum incanum | Torr. & A.Gray | Polygonaceae | 8 |
| Eriogonum inflatum | Torr. & Frém. | Polygonaceae | 8 |
| Eriogonum intrafractum | Coville & C.V.Morton | Polygonaceae | 8 |
| Eriogonum kennedyi | Porter ex S.Watson | Polygonaceae | 8 |
| Eriogonum latens | Jeps. | Polygonaceae | 8 |
| Eriogonum latifolium | Sm. | Polygonaceae | 8 |
| Eriogonum libertini | Reveal | Polygonaceae | 8 |
| Eriogonum lobbii | Torr. & A.Gray | Polygonaceae | 8 |
| Eriogonum luteolum | Greene | Polygonaceae | 8 |
| Eriogonum maculatum | A.Heller | Polygonaceae | 8 |
| Eriogonum marifolium | A.Gray | Polygonaceae | 8 |
| Eriogonum mensicola | S.Stokes | Polygonaceae | 8 |
| Eriogonum nidularium | Coville | Polygonaceae | 8 |
| Eriogonum nortonii | Greene | Polygonaceae | 8 |
| Eriogonum nudum | Douglas ex Benth. | Polygonaceae | 8 |
| Eriogonum nummulare | M.E.Jones | Polygonaceae | 8 |
| Eriogonum ochrocephalum | S.Watson | Polygonaceae | 8 |
| Eriogonum ordii | S.Watson | Polygonaceae | 8 |
| Eriogonum ovalifolium | Nutt. | Polygonaceae | 8 |
| Eriogonum palmerianum | Reveal | Polygonaceae | 8 |
| Eriogonum panamintense | C.V.Morton | Polygonaceae | 8 |
| Eriogonum parishii | S.Watson | Polygonaceae | 8 |
| Eriogonum parvifolium | Sm. | Polygonaceae | 8 |
| Eriogonum plumatella | Durand & Hilg. | Polygonaceae | 8 |
| Eriogonum polypodum | Small | Polygonaceae | 8 |
| Eriogonum pusillum | Torr. & A.Gray | Polygonaceae | 8 |
| Eriogonum pyrolifolium | Hook. | Polygonaceae | 8 |
| Eriogonum reniforme | Torr. & Frém. | Polygonaceae | 8 |
| Eriogonum rixfordii | S.Stokes | Polygonaceae | 8 |
| Eriogonum rosense | A.Nelson & P.B.Kenn. | Polygonaceae | 8 |
| Eriogonum roseum | Durand & Hilg. | Polygonaceae | 8 |
| Eriogonum rupinum | Reveal | Polygonaceae | 8 |
| Eriogonum saxatile | S.Watson | Polygonaceae | 8 |
| Eriogonum shockleyi | S.Watson | Polygonaceae | 8 |
| Eriogonum siskiyouense | Small | Polygonaceae | 8 |
| Eriogonum spergulinum | A.Gray | Polygonaceae | 8 |
| Eriogonum sphaerocephalum | Douglas ex Benth. | Polygonaceae | 8 |
| Eriogonum strictum | Benth. | Polygonaceae | 8 |
| Eriogonum thomasii | Torr. | Polygonaceae | 8 |
| Eriogonum thurberi | Torr. | Polygonaceae | 8 |
| Eriogonum trichopes | Torr. | Polygonaceae | 8 |
| Eriogonum tripodum | Greene | Polygonaceae | 8 |
| Eriogonum umbellatum | Torr. | Polygonaceae | 8 |
| Eriogonum ursinum | S.Watson | Polygonaceae | 8 |
| Eriogonum vestitum | J.T.Howell | Polygonaceae | 8 |
| Eriogonum vimineum | Douglas ex Benth. | Polygonaceae | 8 |
| Eriogonum viridescens | A.Heller | Polygonaceae | 8 |
| Eriogonum wrightii | Torr. ex Benth. | Polygonaceae | 8 |
| Erioneuron pilosum | (Buckley) Nash | Poaceae | 8 |
| Eriophorum gracile | Roth | Cyperaceae | 8 |
| Eriophyllum ambiguum | A.Gray | Asteraceae | 8 |
| Eriophyllum confertiflorum | (DC.) A.Gray | Asteraceae | 8 |
| Eriophyllum jepsonii | Greene | Asteraceae | 8 |
| Eriophyllum lanatum | (Pursh) J.Forbes | Asteraceae | 8 |
| Eriophyllum lanosum | (A.Gray) A.Gray | Asteraceae | 8 |
| Eriophyllum mohavense | Jeps. | Asteraceae | 8 |
| Eriophyllum multicaule | A.Gray | Asteraceae | 8 |
| Eriophyllum nubigenum | Greene ex A.Gray | Asteraceae | 8 |
| Eriophyllum pringlei | A.Gray | Asteraceae | 8 |
| Eriophyllum wallacei | A.Gray | Asteraceae | 8 |
| Erocallis triphylla | (S.Watson) Rydb. | Montiaceae | 8 |
| Erodium texanum | A.Gray | Geraniaceae | 8 |
| Eryngium aristulatum | Jeps. | Apiaceae | 8 |
| Eryngium armatum | (S.Watson) J.M.Coult. & Rose | Apiaceae | 8 |
| Eryngium articulatum | Hook. | Apiaceae | 8 |
| Eryngium montereyense | D.W.Taylor & R.E.Preston | Apiaceae | 8 |
| Erysimum capitatum | Greene | Brassicaceae | 8 |
| Erysimum concinnum | Eastw. | Brassicaceae | 8 |
| Erysimum franciscanum | Rossbach | Brassicaceae | 8 |
| Erysimum insulare | (Greene) Greene | Brassicaceae | 8 |
| Erysimum menziesii | (Hook.) Wettst. | Brassicaceae | 8 |
| Erysimum perenne | (S.Watson ex Coville) Abrams | Brassicaceae | 8 |
| Erysimum suffrutescens | (Abrams) Rossbach | Brassicaceae | 8 |
| Erysimum teretifolium | Eastw. | Brassicaceae | 8 |
| Erythranthe acutidens | (Greene) G.L.Nesom | Phrymaceae | 8 |
| Erythranthe alsinoides | (Douglas ex Benth.) G.L.Nesom & N.S.Fraga | Phrymaceae | 8 |
| Erythranthe androsacea | (Curran ex Greene) N.S.Fraga | Phrymaceae | 8 |
| Erythranthe angulosa | M.Berger | Phrymaceae | 8 |
| Erythranthe arenaria | (A.L.Grant) G.L.Nesom | Phrymaceae | 8 |
| Erythranthe arvensis | (Greene) G.L.Nesom | Phrymaceae | 8 |
| Erythranthe barbata | (Greene) N.S.Fraga | Phrymaceae | 8 |
| Erythranthe bergeri | G.L.Nesom | Phrymaceae | 8 |
| Erythranthe bicolor | (Hartw. ex Benth.) G.L.Nesom & N.S.Fraga | Phrymaceae | 8 |
| Erythranthe breweri | (Greene) G.L.Nesom & N.S.Fraga | Phrymaceae | 8 |
| Erythranthe calcicola | N.S.Fraga & D.A.York | Phrymaceae | 8 |
| Erythranthe cardinalis | (Douglas ex Benth.) Spach | Phrymaceae | 8 |
| Erythranthe carsonensis | N.S.Fraga | Phrymaceae | 8 |
| Erythranthe corallina | (Greene) G.L.Nesom | Phrymaceae | 8 |
| Erythranthe cordata | (Greene) G.L.Nesom | Phrymaceae | 8 |
| Erythranthe dentata | (Nutt. ex Benth.) G.L.Nesom | Phrymaceae | 8 |
| Erythranthe diffusa | (A.L.Grant) N.S.Fraga | Phrymaceae | 8 |
| Erythranthe discolor | (A.L.Grant) N.S.Fraga | Phrymaceae | 8 |
| Erythranthe erubescens | G.L.Nesom | Phrymaceae | 8 |
| Erythranthe filicaulis | (S.Watson) G.L.Nesom & N.S.Fraga | Phrymaceae | 8 |
| Erythranthe floribunda | (Lindl.) G.L.Nesom | Phrymaceae | 8 |
| Erythranthe geniculata | (Greene) G.L.Nesom | Phrymaceae | 8 |
| Erythranthe glaucescens | (Greene) G.L.Nesom | Phrymaceae | 8 |
| Erythranthe grandis | (Greene) G.L.Nesom | Phrymaceae | 8 |
| Erythranthe guttata | (DC.) G.L.Nesom | Phrymaceae | 8 |
| Erythranthe howaldiae | G.L.Nesom | Phrymaceae | 8 |
| Erythranthe inconspicua | (A.Gray) G.L.Nesom | Phrymaceae | 8 |
| Erythranthe laciniata | (A.Gray) G.L.Nesom | Phrymaceae | 8 |
| Erythranthe lewisii | (Pursh) G.L.Nesom & N.S.Fraga | Phrymaceae | 8 |
| Erythranthe linearifolia | (A.L.Grant) G.L.Nesom & N.S.Fraga | Phrymaceae | 8 |
| Erythranthe microphylla | (Benth.) G.L.Nesom | Phrymaceae | 8 |
| Erythranthe montioides | (A.Gray) N.S.Fraga | Phrymaceae | 8 |
| Erythranthe moschata | (Douglas ex Lindl.) G.L.Nesom | Phrymaceae | 8 |
| Erythranthe nasuta | (Greene) G.L.Nesom | Phrymaceae | 8 |
| Erythranthe nudata | (Curran ex Greene) G.L.Nesom | Phrymaceae | 8 |
| Erythranthe palmeri | (A.Gray) N.S.Fraga | Phrymaceae | 8 |
| Erythranthe parishii | (Greene) G.L.Nesom & N.S.Fraga | Phrymaceae | 8 |
| Erythranthe primuloides | (Benth.) G.L.Nesom & N.S.Fraga | Phrymaceae | 8 |
| Erythranthe ptilota | G.L.Nesom | Phrymaceae | 8 |
| Erythranthe pulsiferae | (A.Gray) G.L.Nesom | Phrymaceae | 8 |
| Erythranthe purpurea | N.S.Fraga | Phrymaceae | 8 |
| Erythranthe rhodopetra | N.S.Fraga | Phrymaceae | 8 |
| Erythranthe rubella | (A.Gray) N.S.Fraga | Phrymaceae | 8 |
| Erythranthe serpentinicola | D.J.Keil | Phrymaceae | 8 |
| Erythranthe suksdorfii | (A.Gray) N.S.Fraga | Phrymaceae | 8 |
| Erythranthe taylorii | G.L.Nesom | Phrymaceae | 8 |
| Erythranthe tilingii | (Regel) G.L.Nesom | Phrymaceae | 8 |
| Erythranthe trinitiensis | G.L.Nesom | Phrymaceae | 8 |
| Erythronium californicum | Purdy | Liliaceae | 8 |
| Erythronium citrinum | S.Watson | Liliaceae | 8 |
| Erythronium grandiflorum | Pursh | Liliaceae | 8 |
| Erythronium helenae | Applegate | Liliaceae | 8 |
| Erythronium hendersonii | S.Watson | Liliaceae | 8 |
| Erythronium klamathense | Applegate | Liliaceae | 8 |
| Erythronium multiscapideum | (Kellogg) A.Nelson & P.B.Kenn. | Liliaceae | 8 |
| Erythronium oregonum | Applegate | Liliaceae | 8 |
| Erythronium purpurascens | S.Watson | Liliaceae | 8 |
| Erythronium pusaterii | (Munz & J.T.Howell) Shevock, Bartel & G.A.Allen | Liliaceae | 8 |
| Erythronium revolutum | Sm. | Liliaceae | 8 |
| Erythronium shastense | D.A.York, J.K.Nelson & D.W.Taylor | Liliaceae | 8 |
| Eschscholzia androuxii | Still | Papaveraceae | 8 |
| Eschscholzia caespitosa | Benth. | Papaveraceae | 8 |
| Eschscholzia californica | Cham. | Papaveraceae | 8 |
| Eschscholzia glyptosperma | Greene | Papaveraceae | 8 |
| Eschscholzia hypecoides | Benth. | Papaveraceae | 8 |
| Eschscholzia lemmonii | Greene | Papaveraceae | 8 |
| Eschscholzia lobbii | Greene | Papaveraceae | 8 |
| Eschscholzia minutiflora | S.Watson | Papaveraceae | 8 |
| Eschscholzia papastillii | Still | Papaveraceae | 8 |
| Eschscholzia parishii | Greene | Papaveraceae | 8 |
| Eschscholzia ramosa | (Greene) Greene | Papaveraceae | 8 |
| Eucnide urens | Parry ex Coville | Loasaceae | 8 |
| Eucrypta chrysanthemifolia | (Benth.) Greene | Hydrophyllaceae | 8 |
| Eucrypta micrantha | (Torr.) A.Heller | Hydrophyllaceae | 8 |
| Eulobus californicus | Nutt. ex Torr. & A.Gray | Onagraceae | 8 |
| Euonymus occidentalis | Nutt. ex Torr. | Celastraceae | 8 |
| Euphorbia abramsiana | L.C.Wheeler | Euphorbiaceae | 8 |
| Euphorbia albomarginata | Torr. & A.Gray | Euphorbiaceae | 8 |
| Euphorbia arizonica | Engelm. | Euphorbiaceae | 8 |
| Euphorbia californica | Benth. | Euphorbiaceae | 8 |
| Euphorbia crenulata | Engelm. | Euphorbiaceae | 8 |
| Euphorbia davidii | Subils | Euphorbiaceae | 8 |
| Euphorbia eriantha | Benth. | Euphorbiaceae | 8 |
| Euphorbia exstipulata | Engelm. | Euphorbiaceae | 8 |
| Euphorbia fendleri | Torr. & A.Gray | Euphorbiaceae | 8 |
| Euphorbia glyptosperma | Engelm. | Euphorbiaceae | 8 |
| Euphorbia hirta | L. | Euphorbiaceae | 8 |
| Euphorbia jaegeri | V.W.Steinm. & J.M.André | Euphorbiaceae | 8 |
| Euphorbia lurida | Engelm. | Euphorbiaceae | 8 |
| Euphorbia melanadenia | Torr. | Euphorbiaceae | 8 |
| Euphorbia micromera | Boiss. | Euphorbiaceae | 8 |
| Euphorbia misera | Benth. | Euphorbiaceae | 8 |
| Euphorbia ocellata | Durand & Hilg. | Euphorbiaceae | 8 |
| Euphorbia parishii | Greene | Euphorbiaceae | 8 |
| Euphorbia parryi | Engelm. | Euphorbiaceae | 8 |
| Euphorbia pediculifera | Engelm. | Euphorbiaceae | 8 |
| Euphorbia polycarpa | Benth. | Euphorbiaceae | 8 |
| Euphorbia revoluta | Engelm. | Euphorbiaceae | 8 |
| Euphorbia schizoloba | Engelm. | Euphorbiaceae | 8 |
| Euphorbia serpillifolia | Pers. | Euphorbiaceae | 8 |
| Euphorbia setiloba | Engelm. | Euphorbiaceae | 8 |
| Euphorbia spathulata | Lam. | Euphorbiaceae | 8 |
| Euphrosyne nevadensis | (M.E.Jones) Panero | Asteraceae | 8 |
| Euploca convolvulacea | Nutt. | Heliotropiaceae | 8 |
| Euploca procumbens | (Mill.) Diane & Hilger | Heliotropiaceae | 8 |
| Eurybia integrifolia | (Nutt.) G.L.Nesom | Asteraceae | 8 |
| Eurybia radulina | (A.Gray) G.L.Nesom | Asteraceae | 8 |
| Eustoma exaltatum | (L.) Salisb. ex G.Don | Gentianaceae | 8 |
| Euthamia occidentalis | Nutt. | Asteraceae | 8 |
| Extriplex californica | (Moq.) E.H.Zacharias | Chenopodiaceae | 8 |
| Extriplex joaquinana | (A.Nelson) E.H.Zacharias | Chenopodiaceae | 8 |
| Fallugia paradoxa | (D.Don ex Tilloch & Taylor) Endl. ex Torr. | Rosaceae | 8 |
| Fendlerella utahensis | (S.Watson) A.Heller | Hydrangeaceae | 8 |
| Ferocactus acanthodes | (Lem.) Britton & Rose | Cactaceae | 8 |
| Ferocactus viridescens | (Torr. & A.Gray) Britton & Rose | Cactaceae | 8 |
| Festuca brachyphylla | Schult. & Schult.f. | Poaceae | 8 |
| Festuca californica | Vasey | Poaceae | 8 |
| Festuca idahoensis | Elmer | Poaceae | 8 |
| Festuca kingii | (S.Watson) Cassidy | Poaceae | 8 |
| Festuca microstachys | Nutt. | Poaceae | 8 |
| Festuca occidentalis | Hook. | Poaceae | 8 |
| Festuca octoflora | Walter | Poaceae | 8 |
| Festuca rubra | L. | Poaceae | 8 |
| Fimbristylis thermalis | S.Watson | Cyperaceae | 8 |
| Fimbristylis vahlii | (Lam.) Link | Cyperaceae | 8 |
| Flaveria trinervia | (Spreng.) C.Mohr | Asteraceae | 8 |
| Floerkea proserpinacoides | Willd. | Limnanthaceae | 8 |
| Forestiera pubescens | Nutt. | Oleaceae | 8 |
| Fouquieria splendens | Engelm. | Fouquieriaceae | 8 |
| Fragaria vesca | L. | Rosaceae | 8 |
| Fragaria virginiana | Mill. | Rosaceae | 8 |
| Frangula californica | (Eschsch.) A.Gray | Rhamnaceae | 8 |
| Frangula purshiana | (DC.) A.Gray ex J.G.Cooper | Rhamnaceae | 8 |
| Frankenia palmeri | S.Watson | Frankeniaceae | 8 |
| Frankenia salina | (Molina) I.M.Johnst. | Frankeniaceae | 8 |
| Frasera albicaulis | Griseb. | Gentianaceae | 8 |
| Frasera albomarginata | S.Watson | Gentianaceae | 8 |
| Frasera neglecta | H.M.Hall | Gentianaceae | 8 |
| Frasera parryi | Torr. | Gentianaceae | 8 |
| Frasera puberulenta | Davidson | Gentianaceae | 8 |
| Frasera speciosa | Douglas ex Griseb. | Gentianaceae | 8 |
| Frasera tubulosa | Coville | Gentianaceae | 8 |
| Fraxinus anomala | Torr. ex S.Watson | Oleaceae | 8 |
| Fraxinus dipetala | Hook. & Arn. | Oleaceae | 8 |
| Fraxinus latifolia | Benth. | Oleaceae | 8 |
| Fraxinus velutina | Torr. | Oleaceae | 8 |
| Fremontodendron californicum | (Torr.) Coville | Malvaceae | 8 |
| Fremontodendron mexicanum | Davidson | Malvaceae | 8 |
| Fritillaria affinis | (Schult. & Schult.f.) Sealy | Liliaceae | 8 |
| Fritillaria agrestis | Greene | Liliaceae | 8 |
| Fritillaria atropurpurea | Nutt. | Liliaceae | 8 |
| Fritillaria biflora | Lindl. | Liliaceae | 8 |
| Fritillaria brandegeei | Eastw. | Liliaceae | 8 |
| Fritillaria eastwoodiae | R.M.Macfarl. | Liliaceae | 8 |
| Fritillaria falcata | (Jeps.) D.E.Beetle | Liliaceae | 8 |
| Fritillaria glauca | Greene | Liliaceae | 8 |
| Fritillaria liliacea | Lindl. | Liliaceae | 8 |
| Fritillaria micrantha | A.Heller | Liliaceae | 8 |
| Fritillaria ojaiensis | Davidson | Liliaceae | 8 |
| Fritillaria pinetorum | Davidson | Liliaceae | 8 |
| Fritillaria pluriflora | Torr. ex Benth. | Liliaceae | 8 |
| Fritillaria pudica | (Pursh) Spreng. | Liliaceae | 8 |
| Fritillaria purdyi | Eastw. | Liliaceae | 8 |
| Fritillaria recurva | Benth. | Liliaceae | 8 |
| Fritillaria striata | Eastw. | Liliaceae | 8 |
| Funastrum crispum | (Benth.) Schltr. | Apocynaceae | 8 |
| Funastrum heterophyllum | (Engelm. ex Torr.) Standl. | Apocynaceae | 8 |
| Funastrum utahense | (Engelm.) Liede & Meve | Apocynaceae | 8 |
| Galium andrewsii | A.Gray | Rubiaceae | 8 |
| Galium angustifolium | Nutt. | Rubiaceae | 8 |
| Galium californicum | Hook. & Arn. | Rubiaceae | 8 |
| Galium grayanum | Ehrend. | Rubiaceae | 8 |
| Galium mexicanum | Kunth | Rubiaceae | 8 |
| Galium nuttallii | A.Gray | Rubiaceae | 8 |
| Galium porrigens | Dempster | Rubiaceae | 8 |
| Galium proliferum | A.Gray | Rubiaceae | 8 |
| Galium serpenticum | Dempster | Rubiaceae | 8 |
| Galium stellatum | Kellogg | Rubiaceae | 8 |
| Galium trifidum | L. | Rubiaceae | 8 |
| Galium triflorum | Michx. | Rubiaceae | 8 |
| Galium wrightii | A.Gray | Rubiaceae | 8 |
| Gambelia juncea | (Benth.) D.A.Sutton | Plantaginaceae | 8 |
| Gambelia speciosa | Nutt. | Plantaginaceae | 8 |
| Gamochaeta pensylvanica | (Willd.) Cabrera | Asteraceae | 8 |
| Gamochaeta ustulata | (Nutt.) Holub | Asteraceae | 8 |
| Garrya buxifolia | A.Gray | Garryaceae | 8 |
| Garrya elliptica | Douglas ex Lindl. | Garryaceae | 8 |
| Garrya flavescens | S.Watson | Garryaceae | 8 |
| Garrya fremontii | Torr. | Garryaceae | 8 |
| Garrya veatchii | Kellogg | Garryaceae | 8 |
| Gaultheria humifusa | (Graham) Rydb. | Ericaceae | 8 |
| Gaultheria ovatifolia | A.Gray | Ericaceae | 8 |
| Gaultheria shallon | Pursh | Ericaceae | 8 |
| Gayophytum ramosissimum | Torr. & A.Gray | Onagraceae | 8 |
| Gentiana affinis | Griseb. | Gentianaceae | 8 |
| Gentiana calycosa | Griseb. | Gentianaceae | 8 |
| Gentiana newberryi | A.Gray | Gentianaceae | 8 |
| Gentiana prostrata | Haenke | Gentianaceae | 8 |
| Gentiana sceptrum | Griseb. | Gentianaceae | 8 |
| Gentiana setigera | A.Gray | Gentianaceae | 8 |
| Gentianopsis holopetala | (A.Gray) Iltis | Gentianaceae | 8 |
| Gentianopsis simplex | (A.Gray) Iltis | Gentianaceae | 8 |
| Geraea canescens | Torr. & A.Gray | Asteraceae | 8 |
| Geraea viscida | S.F.Blake | Asteraceae | 8 |
| Geranium bicknellii | Britton | Geraniaceae | 8 |
| Geranium californicum | G.N.Jones & F.F.Jones | Geraniaceae | 8 |
| Geranium carolinianum | L. | Geraniaceae | 8 |
| Geranium oreganum | Howell | Geraniaceae | 8 |
| Geranium richardsonii | Fisch. & Trautv. | Geraniaceae | 8 |
| Geranium viscosissimum | Fisch. & C.A.Mey. | Geraniaceae | 8 |
| Geum aleppicum | Jacq. | Rosaceae | 8 |
| Geum macrophyllum | Willd. | Rosaceae | 8 |
| Geum triflorum | Pursh | Rosaceae | 8 |
| Gilia achilleifolia | Benth. | Polemoniaceae | 8 |
| Gilia angelensis | V.E.Grant | Polemoniaceae | 8 |
| Gilia austrooccidentalis | (A.D.Grant & V.E.Grant) A.D.Grant & V.E.Grant | Polemoniaceae | 8 |
| Gilia brecciarum | M.E.Jones | Polemoniaceae | 8 |
| Gilia cana | (M.E.Jones) A.Heller | Polemoniaceae | 8 |
| Gilia capitata | Sims | Polemoniaceae | 8 |
| Gilia clivorum | (Jeps.) V.E.Grant | Polemoniaceae | 8 |
| Gilia clokeyi | H.Mason | Polemoniaceae | 8 |
| Gilia diegensis | (Munz) A.D.Grant & V.E.Grant | Polemoniaceae | 8 |
| Gilia inconspicua | (Sm.) Sweet | Polemoniaceae | 8 |
| Gilia latiflora | A.Gray | Polemoniaceae | 8 |
| Gilia leptantha | Parish | Polemoniaceae | 8 |
| Gilia millefoliata | Fisch. & C.A.Mey. | Polemoniaceae | 8 |
| Gilia minor | A.D.Grant & V.E.Grant | Polemoniaceae | 8 |
| Gilia nevinii | A.Gray | Polemoniaceae | 8 |
| Gilia ochroleuca | M.E.Jones | Polemoniaceae | 8 |
| Gilia ophthalmoides | Brand | Polemoniaceae | 8 |
| Gilia scopulorum | M.E.Jones | Polemoniaceae | 8 |
| Gilia sinuata | Douglas ex Benth. | Polemoniaceae | 8 |
| Gilia stellata | A.Heller | Polemoniaceae | 8 |
| Gilia tenuiflora | Benth. | Polemoniaceae | 8 |
| Gilia transmontana | (H.Mason & A.D.Grant) A.D.Grant & V.E.Grant | Polemoniaceae | 8 |
| Gilia tricolor | Benth. | Polemoniaceae | 8 |
| Gilmania luteola | (Coville) Coville | Polygonaceae | 8 |
| Githopsis diffusa | A.Gray | Campanulaceae | 8 |
| Githopsis specularioides | Nutt. | Campanulaceae | 8 |
| Glehnia littoralis | (J.G.Cooper) F.Schmidt ex Miq. | Apiaceae | 8 |
| Glossopetalon spinescens | A.Gray | Crossosomataceae | 8 |
| Glyceria borealis | (Nash) Batch. | Poaceae | 8 |
| Glyceria elata | (Nash) M.E.Jones | Poaceae | 8 |
| Glyceria grandis | S.Watson | Poaceae | 8 |
| Glyceria striata | (Lam.) Hitchc. | Poaceae | 8 |
| Glycyrrhiza lepidota | Pursh | Fabaceae | 8 |
| Glyptopleura marginata | D.C.Eaton | Asteraceae | 8 |
| Gnaphalium palustre | Nutt. | Asteraceae | 8 |
| Goodmania luteola | (Parry) Reveal & Ertter | Polygonaceae | 8 |
| Goodyera oblongifolia | Raf. | Orchidaceae | 8 |
| Graphephorum canescens | (Buckley) Röser & Tkach | Poaceae | 8 |
| Graphephorum wolfii | (Vasey) Coult. | Poaceae | 8 |
| Gratiola ebracteata | Benth. ex A.DC. | Plantaginaceae | 8 |
| Gratiola heterosepala | H.Mason & Bacigal. | Plantaginaceae | 8 |
| Gratiola neglecta | Torr. | Plantaginaceae | 8 |
| Grayia spinosa | (Hook.) Moq. | Chenopodiaceae | 8 |
| Grindelia ciliata | (Nutt.) Spreng. | Asteraceae | 8 |
| Grindelia hirsutula | Hook. & Arn. | Asteraceae | 8 |
| Grindelia squarrosa | (Pursh) Dunal | Asteraceae | 8 |
| Grusonia kunzei | (Rose) Pinkava | Cactaceae | 8 |
| Grusonia parishii | (Orcutt) Pinkava | Cactaceae | 8 |
| Guilleminea densa | (Humb. & Bonpl. ex Schult.) Moq. | Amaranthaceae | 8 |
| Gutierrezia californica | (DC.) Torr. & A.Gray | Asteraceae | 8 |
| Gutierrezia microcephala | (DC.) A.Gray | Asteraceae | 8 |
| Gutierrezia sarothrae | (Pursh) Britton & Rusby | Asteraceae | 8 |
| Gymnosteris parvula | A.Heller | Polemoniaceae | 8 |
| Hackelia brevicula | (Jeps.) J.L.Gentry | Boraginaceae | 8 |
| Hackelia californica | I.M.Johnst. | Boraginaceae | 8 |
| Hackelia cusickii | Brand | Boraginaceae | 8 |
| Hackelia floribunda | (Lehm.) I.M.Johnst. | Boraginaceae | 8 |
| Hackelia micrantha | (Eastw.) J.L.Gentry | Boraginaceae | 8 |
| Hackelia mundula | (Jeps.) Ferris | Boraginaceae | 8 |
| Hackelia nervosa | (Kellogg) I.M.Johnst. | Boraginaceae | 8 |
| Hackelia velutina | I.M.Johnst. | Boraginaceae | 8 |
| Halerpestes cymbalaria | Greene | Ranunculaceae | 8 |
| Halimolobos jaegeri | (Munz) Rollins | Brassicaceae | 8 |
| Hamogalium bifolium | (S.Watson) Kadereit & Schneew. | Rubiaceae | 8 |
| Harmonia doris-nilesiae | (T.W.Nelson & J.P.Nelson) B.G.Baldwin | Asteraceae | 8 |
| Harmonia guggolziorum | B.G.Baldwin | Asteraceae | 8 |
| Harmonia hallii | (D.D.Keck) B.G.Baldwin | Asteraceae | 8 |
| Harmonia nutans | (Greene) B.G.Baldwin | Asteraceae | 8 |
| Harpagonella palmeri | A.Gray | Boraginaceae | 8 |
| Hastingsia alba | (Durand) S.Watson | Asparagaceae | 8 |
| Hastingsia serpentinicola | Becking | Asparagaceae | 8 |
| Hazardia cana | Greene | Asteraceae | 8 |
| Hazardia detonsa | Greene | Asteraceae | 8 |
| Hazardia orcuttii | Greene | Asteraceae | 8 |
| Hazardia squarrosa | (Hook. & Arn.) Greene | Asteraceae | 8 |
| Hazardia stenolepis | (Hall) Hoover | Asteraceae | 8 |
| Hecastocleis shockleyi | A.Gray | Asteraceae | 8 |
| Hedeoma drummondii | Benth. | Lamiaceae | 8 |
| Hedeoma nana | (Torr.) Briq. | Lamiaceae | 8 |
| Helenium amarum | (Raf.) H.Rock | Asteraceae | 8 |
| Helenium autumnale | L. | Asteraceae | 8 |
| Helenium bigelovii | A.Gray | Asteraceae | 8 |
| Helenium bolanderi | A.Gray | Asteraceae | 8 |
| Helenium puberulum | DC. | Asteraceae | 8 |
| Helianthella californica | A.Gray | Asteraceae | 8 |
| Helianthella castanea | Greene | Asteraceae | 8 |
| Helianthus annuus | L. | Asteraceae | 8 |
| Helianthus bolanderi | A.Gray | Asteraceae | 8 |
| Helianthus californicus | DC. | Asteraceae | 8 |
| Helianthus ciliaris | DC. | Asteraceae | 8 |
| Helianthus cusickii | A.Gray | Asteraceae | 8 |
| Helianthus exilis | A.Gray | Asteraceae | 8 |
| Helianthus gracilentus | A.Gray | Asteraceae | 8 |
| Helianthus maximiliani | Schrad. | Asteraceae | 8 |
| Helianthus niveus | (Benth.) Brandegee | Asteraceae | 8 |
| Helianthus nuttallii | Torr. & A.Gray | Asteraceae | 8 |
| Helianthus petiolaris | Nutt. | Asteraceae | 8 |
| Helianthus winteri | J.C.Stebbins | Asteraceae | 8 |
| Heliomeris multiflora | Nutt. | Asteraceae | 8 |
| Heliotropium curassavicum | L. | Heliotropiaceae | 8 |
| Hemitomes congestum | A.Gray | Ericaceae | 8 |
| Hemizonella minima | A.Gray | Asteraceae | 8 |
| Hemizonia congesta | DC. | Asteraceae | 8 |
| Heracleum maximum | W.Bartram | Apiaceae | 8 |
| Herissantia crispa | (L.) Brizicky | Malvaceae | 8 |
| Hesperevax acaulis | (Kellogg) Greene | Asteraceae | 8 |
| Hesperevax caulescens | A.Gray | Asteraceae | 8 |
| Hesperevax sparsiflora | Greene | Asteraceae | 8 |
| Hesperocallis undulata | A.Gray | Asparagaceae | 8 |
| Hesperochiron nanus | (Lindl.) Greene | Hydrophyllaceae | 8 |
| Hesperochiron pumilus | (Griseb.) Porter | Hydrophyllaceae | 8 |
| Hesperocnide tenella | Torr. | Urticaceae | 8 |
| Hesperocyparis abramsiana | (C.B.Wolf) Bartel | Cupressaceae | 8 |
| Hesperocyparis forbesii | (Jeps.) Bartel | Cupressaceae | 8 |
| Hesperocyparis goveniana | (Gordon) Bartel | Cupressaceae | 8 |
| Hesperocyparis macnabiana | (A.Murray bis) Bartel | Cupressaceae | 8 |
| Hesperocyparis macrocarpa | (Hartw.) Bartel | Cupressaceae | 8 |
| Hesperocyparis nevadensis | (Abrams) Bartel | Cupressaceae | 8 |
| Hesperocyparis pygmaea | (Lemmon) Bartel | Cupressaceae | 8 |
| Hesperocyparis sargentii | (Jeps.) Bartel | Cupressaceae | 8 |
| Hesperostipa comata | (Trin. & Rupr.) Barkworth | Poaceae | 8 |
| Hesperoyucca whipplei | (Torr.) Trel. | Asparagaceae | 8 |
| Heteranthera dubia | (Jacq.) MacMill. | Pontederiaceae | 8 |
| Heteranthera limosa | (Sw.) Willd. | Pontederiaceae | 8 |
| Heterocodon rariflorus | Nutt. | Campanulaceae | 8 |
| Heteropogon contortus | (L.) P.Beauv. ex Roem. & Schult. | Poaceae | 8 |
| Heterotheca fastigiata | (Greene) V.L.Harms | Asteraceae | 8 |
| Heterotheca grandiflora | Nutt. | Asteraceae | 8 |
| Heterotheca sessiliflora | (Nutt.) Shinners | Asteraceae | 8 |
| Heterotheca subaxillaris | (Lam.) Britton & Rusby | Asteraceae | 8 |
| Heuchera abramsii | Rydb. | Saxifragaceae | 8 |
| Heuchera brevistaminea | Wiggins | Saxifragaceae | 8 |
| Heuchera cylindrica | Douglas | Saxifragaceae | 8 |
| Heuchera elegans | Abrams | Saxifragaceae | 8 |
| Heuchera merriamii | Eastw. | Saxifragaceae | 8 |
| Heuchera micrantha | Douglas ex Lindl. | Saxifragaceae | 8 |
| Heuchera parvifolia | Nutt. ex Torr. & A.Gray | Saxifragaceae | 8 |
| Heuchera pilosissima | Fisch. & C.A.Mey. | Saxifragaceae | 8 |
| Heuchera rubescens | Torr. | Saxifragaceae | 8 |
| Hexasepalum teres | (Walter) J.H.Kirkbr. | Rubiaceae | 8 |
| Hibiscus denudatus | Benth. | Malvaceae | 8 |
| Hieracium albiflorum | Hook. | Asteraceae | 8 |
| Hieracium argutum | Nutt. | Asteraceae | 8 |
| Hieracium bolanderi | A.Gray | Asteraceae | 8 |
| Hieracium horridum | Fr. | Asteraceae | 8 |
| Hieracium scouleri | Hook. | Asteraceae | 8 |
| Hieracium triste | Willd. ex Spreng. | Asteraceae | 8 |
| Hilaria jamesii | (Torr.) Benth. | Poaceae | 8 |
| Hilaria mutica | (Buckley) Benth. | Poaceae | 8 |
| Hippuris vulgaris | L. | Plantaginaceae | 8 |
| Hoffmannseggia glauca | (Ortega) Eifert | Fabaceae | 8 |
| Hoffmannseggia microphylla | Torr. | Fabaceae | 8 |
| Hoita macrostachya | (DC.) Rydb. | Fabaceae | 8 |
| Hoita orbicularis | (Lindl.) Rydb. | Fabaceae | 8 |
| Hoita strobilina | (Hook. & Arn.) Rydb. | Fabaceae | 8 |
| Hollisteria lanata | S.Watson | Polygonaceae | 8 |
| Holocarpha heermannii | (Greene) D.D.Keck | Asteraceae | 8 |
| Holocarpha macradenia | Greene | Asteraceae | 8 |
| Holocarpha obconica | (J.C.Clausen & D.D.Keck) D.D.Keck | Asteraceae | 8 |
| Holocarpha virgata | (A.Gray) D.D.Keck | Asteraceae | 8 |
| Holodiscus discolor | (Pursh) Maxim. | Rosaceae | 8 |
| Holozonia filipes | (Hook. & Arn.) Greene | Asteraceae | 8 |
| Hooveria parviflora | (S.Watson) D.W.Taylor & D.J.Keil | Asparagaceae | 8 |
| Hordeum brachyantherum | Nevski | Poaceae | 8 |
| Hordeum depressum | (Scribn. & J.G.Sm.) Rydb. | Poaceae | 8 |
| Hordeum jubatum | L. | Poaceae | 8 |
| Horsfordia alata | (S.Watson) A.Gray | Malvaceae | 8 |
| Horsfordia newberryi | (S.Watson) A.Gray | Malvaceae | 8 |
| Hosackia crassifolia | Benth. | Fabaceae | 8 |
| Hosackia gracilis | Benth. | Fabaceae | 8 |
| Hosackia oblongifolia | Benth. | Fabaceae | 8 |
| Hosackia pinnata | (Hook.) Abrams | Fabaceae | 8 |
| Hosackia rosea | Eastw. | Fabaceae | 8 |
| Hosackia stipularis | Benth. | Fabaceae | 8 |
| Howellanthus dalesianus | (J.T.Howell) Walden & R.Patt. | Hydrophyllaceae | 8 |
| Hulsea algida | A.Gray | Asteraceae | 8 |
| Hulsea brevifolia | A.Gray | Asteraceae | 8 |
| Hulsea californica | A.Gray | Asteraceae | 8 |
| Hulsea heterochroma | A.Gray | Asteraceae | 8 |
| Hulsea mexicana | Rydb. | Asteraceae | 8 |
| Hulsea nana | A.Gray | Asteraceae | 8 |
| Hulsea vestita | A.Gray | Asteraceae | 8 |
| Humulus neomexicanus | (A.Nelson & Cockerell) Rydb. | Cannabaceae | 8 |
| Hydrocotyle ranunculoides | L.f. | Araliaceae | 8 |
| Hydrocotyle umbellata | L. | Araliaceae | 8 |
| Hydrocotyle verticillata | Thunb. | Araliaceae | 8 |
| Hydrophyllum alpestre | A.Nelson & P.B.Kenn. | Hydrophyllaceae | 8 |
| Hydrophyllum fendleri | (A.Gray) A.Heller | Hydrophyllaceae | 8 |
| Hydrophyllum occidentale | (S.Watson) A.Gray | Hydrophyllaceae | 8 |
| Hydrophyllum tenuipes | A.Heller | Hydrophyllaceae | 8 |
| Hymenopappus filifolius | Hook. | Asteraceae | 8 |
| Hymenothrix dissecta | (A.Gray) B.G.Baldwin | Asteraceae | 8 |
| Hymenothrix wrightii | A.Gray | Asteraceae | 8 |
| Hymenoxys cooperi | Cockerell | Asteraceae | 8 |
| Hymenoxys hoopesii | (A.Gray) Bierner | Asteraceae | 8 |
| Hymenoxys odorata | DC. | Asteraceae | 8 |
| Hypericum anagalloides | Cham. & Schltdl. | Hypericaceae | 8 |
| Hypericum concinnum | Benth. | Hypericaceae | 8 |
| Hypericum scouleri | Hook. | Hypericaceae | 8 |
| Hypopitys monotropa | Crantz | Ericaceae | 8 |
| Idahoa scapigera | (Hook.) A.Nelson & J.F.Macbr. | Brassicaceae | 8 |
| Iliamna bakeri | (Jeps.) Wiggins | Malvaceae | 8 |
| Ionactis alpina | (Nutt.) Greene | Asteraceae | 8 |
| Ipomopsis aggregata | (Pursh) V.E.Grant | Polemoniaceae | 8 |
| Ipomopsis arizonica | (Greene) Wherry | Polemoniaceae | 8 |
| Ipomopsis congesta | (Hook.) V.E.Grant | Polemoniaceae | 8 |
| Ipomopsis polycladon | (Torr.) V.E.Grant | Polemoniaceae | 8 |
| Ipomopsis tenuifolia | (A.Gray) V.E.Grant | Polemoniaceae | 8 |
| Ipomopsis tenuituba | (Rydb.) V.E.Grant | Polemoniaceae | 8 |
| Iris chrysophylla | Howell | Iridaceae | 8 |
| Iris douglasiana | Herb. | Iridaceae | 8 |
| Iris fernaldii | R.C.Foster | Iridaceae | 8 |
| Iris hartwegii | Baker | Iridaceae | 8 |
| Iris longipetala | Herb. | Iridaceae | 8 |
| Iris macrosiphon | Torr. | Iridaceae | 8 |
| Iris missouriensis | Nutt. | Iridaceae | 8 |
| Iris purdyi | Eastw. | Iridaceae | 8 |
| Iris tenax | Douglas ex Lindl. | Iridaceae | 8 |
| Iris tenuissima | Dykes | Iridaceae | 8 |
| Isocoma acradenia | (Greene) Greene | Asteraceae | 8 |
| Isocoma arguta | Greene | Asteraceae | 8 |
| Isoetes bolanderi | Engelm. | Isoetaceae | 8 |
| Isoetes echinospora | Durieu | Isoetaceae | 8 |
| Isoetes howellii | Engelm. | Isoetaceae | 8 |
| Isoetes minima | A.A.Eaton | Isoetaceae | 8 |
| Isoetes nuttallii | A.Braun ex Engelm. | Isoetaceae | 8 |
| Isoetes orcuttii | A.A.Eaton | Isoetaceae | 8 |
| Isolepis carinata | Hook. & Arn. ex Torr. | Cyperaceae | 8 |
| Isolepis cernua | (Vahl) Roem. & Schult. | Cyperaceae | 8 |
| Iva axillaris | Pursh | Asteraceae | 8 |
| Iva hayesiana | A.Gray | Asteraceae | 8 |
| Jamesia americana | Torr. & A.Gray | Hydrangeaceae | 8 |
| Jaumea carnosa | (Less.) A.Gray | Asteraceae | 8 |
| Jensia rammii | (Greene) B.G.Baldwin | Asteraceae | 8 |
| Jensia yosemitana | (Parry ex A.Gray) B.G.Baldwin | Asteraceae | 8 |
| Jepsonia parryi | (Torr.) Small | Saxifragaceae | 8 |
| Johnstonella angustifolia | (Torr.) Hasenstab & M.G.Simpson | Boraginaceae | 8 |
| Johnstonella costata | (Brandegee) Hasenstab & M.G.Simpson | Boraginaceae | 8 |
| Johnstonella holoptera | (A.Gray) Hasenstab & M.G.Simpson | Boraginaceae | 8 |
| Johnstonella racemosa | (S.Watson ex A.Gray) Brand | Boraginaceae | 8 |
| Juglans californica | S.Watson | Juglandaceae | 8 |
| Juglans hindsii | (Jeps.) Jeps. ex R.E.Sm. | Juglandaceae | 8 |
| Juncus acuminatus | Michx. | Juncaceae | 8 |
| Juncus acutus | L. | Juncaceae | 8 |
| Juncus balticus | Willd. | Juncaceae | 8 |
| Juncus breweri | Engelm. | Juncaceae | 8 |
| Juncus bufonius | L. | Juncaceae | 8 |
| Juncus cooperi | Engelm. | Juncaceae | 8 |
| Juncus digitatus | C.W.Witham & Zika | Juncaceae | 8 |
| Juncus drummondii | E.Mey. | Juncaceae | 8 |
| Juncus dubius | Engelm. | Juncaceae | 8 |
| Juncus dudleyi | Wiegand | Juncaceae | 8 |
| Juncus effusus | L. | Juncaceae | 8 |
| Juncus ensifolius | Wikstr. | Juncaceae | 8 |
| Juncus falcatus | E.Mey. | Juncaceae | 8 |
| Juncus kelloggii | Engelm. | Juncaceae | 8 |
| Juncus marginatus | Rostk. | Juncaceae | 8 |
| Juncus mertensianus | Bong. | Juncaceae | 8 |
| Juncus nodosus | L. | Juncaceae | 8 |
| Juncus occidentalis | (Coville) Wiegand | Juncaceae | 8 |
| Juncus parryi | Engelm. | Juncaceae | 8 |
| Juncus patens | E.Mey. | Juncaceae | 8 |
| Juncus phaeocephalus | Engelm. | Juncaceae | 8 |
| Juncus tenuis | Willd. | Juncaceae | 8 |
| Juncus torreyi | Coville | Juncaceae | 8 |
| Juncus xiphioides | E.Mey. | Juncaceae | 8 |
| Juniperus californica | Carrière | Cupressaceae | 8 |
| Juniperus communis | L. | Cupressaceae | 8 |
| Juniperus grandis | R.P.Adams | Cupressaceae | 8 |
| Juniperus occidentalis | Hook. | Cupressaceae | 8 |
| Juniperus osteosperma | (Torr.) Little | Cupressaceae | 8 |
| Justicia californica | (Benth.) D.N.Gibson | Acanthaceae | 8 |
| Kallstroemia californica | (S.Watson) Vail | Zygophyllaceae | 8 |
| Kallstroemia parviflora | Norton | Zygophyllaceae | 8 |
| Kalmia microphylla | (Hook.) A.Heller | Ericaceae | 8 |
| Keckiella antirrhinoides | (Benth.) Straw | Plantaginaceae | 8 |
| Keckiella breviflora | (Lindl.) Straw | Plantaginaceae | 8 |
| Keckiella cordifolia | (Benth.) Straw | Plantaginaceae | 8 |
| Keckiella corymbosa | (Benth. ex A.DC.) Straw | Plantaginaceae | 8 |
| Keckiella lemmonii | (A.Gray) Straw | Plantaginaceae | 8 |
| Keckiella rothrockii | (A.Gray) Straw | Plantaginaceae | 8 |
| Keckiella ternata | (Torr. ex A.Gray) Straw | Plantaginaceae | 8 |
| Kelloggia galioides | Torr. | Rubiaceae | 8 |
| Kirkpatrickia breweri | (D.C.Eaton) Li Bing Zhang, X.M.Zhou & Jing Zhao | Pteridaceae | 8 |
| Koeberlinia spinosa | Zucc. | Koeberliniaceae | 8 |
| Koeleria macrantha | (Ledeb.) Schult. | Poaceae | 8 |
| Koeleria spicata | (L.) Barberá, Quintanar, Soreng & P.M.Peterson | Poaceae | 8 |
| Kopsiopsis hookeri | (Walp.) Govaerts | Orobanchaceae | 8 |
| Kopsiopsis strobilacea | (A.Gray) Beck | Orobanchaceae | 8 |
| Krameria bicolor | S.Watson | Krameriaceae | 8 |
| Krameria erecta | Willd. | Krameriaceae | 8 |
| Krascheninnikovia ceratoides | (L.) Gueldenst. | Chenopodiaceae | 8 |
| Kyhosia bolanderi | (A.Gray) B.G.Baldwin | Asteraceae | 8 |
| Lactuca biennis | (Moench) Fernald | Asteraceae | 8 |
| Lactuca canadensis | L. | Asteraceae | 8 |
| Lactuca ludoviciana | (Nutt.) Riddell | Asteraceae | 8 |
| Lactuca oblongifolia | Nutt. | Asteraceae | 8 |
| Ladeania lanceolata | (Pursh) Reveal & A.N.Egan | Fabaceae | 8 |
| Laennecia coulteri | (A.Gray) G.L.Nesom | Asteraceae | 8 |
| Lagophylla minor | (D.D.Keck) D.D.Keck | Asteraceae | 8 |
| Lagophylla ramosissima | Nutt. | Asteraceae | 8 |
| Langloisia setosissima | (Torr. & A.Gray) Greene | Polemoniaceae | 8 |
| Lappula occidentalis | (S.Watson) Greene | Boraginaceae | 8 |
| Larrea tridentata | (DC.) Coville | Zygophyllaceae | 8 |
| Lastarriaea coriacea | (Goodman) Hoover | Polygonaceae | 8 |
| Lasthenia californica | DC. ex Lindl. | Asteraceae | 8 |
| Lasthenia conjugens | Greene | Asteraceae | 8 |
| Lasthenia coronaria | (Nutt.) Ornduff | Asteraceae | 8 |
| Lasthenia ferrisiae | Ornduff | Asteraceae | 8 |
| Lasthenia fremontii | Greene | Asteraceae | 8 |
| Lasthenia glaberrima | DC. | Asteraceae | 8 |
| Lasthenia glabrata | Lindl. | Asteraceae | 8 |
| Lasthenia gracilis | (DC.) Greene | Asteraceae | 8 |
| Lasthenia maritima | (A.Gray) Ornduff | Asteraceae | 8 |
| Lasthenia microglossa | Greene | Asteraceae | 8 |
| Lasthenia minor | (DC.) Ornduff | Asteraceae | 8 |
| Lathyrus delnorticus | C.L.Hitchc. | Fabaceae | 8 |
| Lathyrus japonicus | Willd. | Fabaceae | 8 |
| Lathyrus lanszwertii | Kellogg | Fabaceae | 8 |
| Lathyrus littoralis | (Nutt.) Endl. ex Walp. | Fabaceae | 8 |
| Lathyrus nevadensis | S.Watson | Fabaceae | 8 |
| Lathyrus palustris | L. | Fabaceae | 8 |
| Lathyrus polyphyllus | Nutt. | Fabaceae | 8 |
| Lathyrus splendens | Kellogg | Fabaceae | 8 |
| Lathyrus sulphureus | W.H.Brewer ex A.Gray | Fabaceae | 8 |
| Lathyrus vestitus | Nutt. | Fabaceae | 8 |
| Layia carnosa | (Nutt.) Torr. & A.Gray | Asteraceae | 8 |
| Layia erubescens | B.G.Baldwin | Asteraceae | 8 |
| Layia fremontii | (Torr. & A.Gray) A.Gray | Asteraceae | 8 |
| Layia glandulosa | (Hook.) Hook. & Arn. | Asteraceae | 8 |
| Layia heterotricha | Hook. & Arn. | Asteraceae | 8 |
| Layia hieracioides | Hook. & Arn. | Asteraceae | 8 |
| Layia jonesii | A.Gray | Asteraceae | 8 |
| Layia leucopappa | D.D.Keck | Asteraceae | 8 |
| Layia munzii | D.D.Keck | Asteraceae | 8 |
| Layia platyglossa | (Fisch. & C.A.Mey.) A.Gray | Asteraceae | 8 |
| Layia septentrionalis | D.D.Keck | Asteraceae | 8 |
| Leersia oryzoides | (L.) Sw. | Poaceae | 8 |
| Lemna aequinoctialis | Welw. | Araceae | 8 |
| Lemna gibba | L. | Araceae | 8 |
| Lemna minor | L. | Araceae | 8 |
| Lemna minuta | Kunth | Araceae | 8 |
| Lemna trisulca | L. | Araceae | 8 |
| Lemna turionifera | Landolt | Araceae | 8 |
| Lepechinia calycina | (Benth.) Epling | Lamiaceae | 8 |
| Lepechinia cardiophylla | Epling | Lamiaceae | 8 |
| Lepechinia fragrans | (Greene) Epling | Lamiaceae | 8 |
| Lepechinia ganderi | Epling | Lamiaceae | 8 |
| Lepechinia rossii | S.Boyd & Mistretta | Lamiaceae | 8 |
| Lepidium acutidens | (A.Gray) Howell | Brassicaceae | 8 |
| Lepidium densiflorum | Schrad. | Brassicaceae | 8 |
| Lepidium flavum | Torr. | Brassicaceae | 8 |
| Lepidium fremontii | S.Watson | Brassicaceae | 8 |
| Lepidium jaredii | Brandegee | Brassicaceae | 8 |
| Lepidium lasiocarpum | Nutt. | Brassicaceae | 8 |
| Lepidium montanum | Nutt. | Brassicaceae | 8 |
| Lepidium nitidum | Nutt. | Brassicaceae | 8 |
| Lepidium oblongum | Small | Brassicaceae | 8 |
| Lepidium strictum | (S.Watson) Rattan ex B.L.Rob. | Brassicaceae | 8 |
| Lepidium thurberi | Wooton | Brassicaceae | 8 |
| Lepidium virginicum | L. | Brassicaceae | 8 |
| Lepidospartum latisquamum | S.Watson | Asteraceae | 8 |
| Lepidospartum squamatum | (A.Gray) A.Gray | Asteraceae | 8 |
| Leptochloa panicea | (Retz.) Ohwi | Poaceae | 8 |
| Leptosiphon ambiguus | (Rattan) J.M.Porter & L.A.Johnson | Polemoniaceae | 8 |
| Leptosiphon androsaceus | Benth. | Polemoniaceae | 8 |
| Leptosiphon bicolor | Nutt. | Polemoniaceae | 8 |
| Leptosiphon bolanderi | (A.Gray) J.M.Porter & L.A.Johnson | Polemoniaceae | 8 |
| Leptosiphon breviculus | (A.Gray) J.M.Porter & L.A.Johnson | Polemoniaceae | 8 |
| Leptosiphon chrysanthus | J.M.Porter & R.Patt. | Polemoniaceae | 8 |
| Leptosiphon ciliatus | (Benth.) Jeps. | Polemoniaceae | 8 |
| Leptosiphon croceus | (Eastw.) Strother & Kersh | Polemoniaceae | 8 |
| Leptosiphon filipes | (Benth.) J.M.Porter & L.A.Johnson | Polemoniaceae | 8 |
| Leptosiphon floribundus | (A.Gray) J.M.Porter & L.A.Johnson | Polemoniaceae | 8 |
| Leptosiphon grandiflorus | Benth. | Polemoniaceae | 8 |
| Leptosiphon latisectus | (E.G.Buxton) J.M.Porter & L.A.Johnson | Polemoniaceae | 8 |
| Leptosiphon lemmonii | (A.Gray) J.M.Porter & L.A.Johnson | Polemoniaceae | 8 |
| Leptosiphon liniflorus | (Benth.) J.M.Porter & L.A.Johnson | Polemoniaceae | 8 |
| Leptosiphon montanus | (Greene) J.M.Porter & L.A.Johnson | Polemoniaceae | 8 |
| Leptosiphon nuttallii | (A.Gray) J.M.Porter & L.A.Johnson | Polemoniaceae | 8 |
| Leptosiphon parviflorus | Benth. | Polemoniaceae | 8 |
| Leptosiphon pygmaeus | (Brand) J.M.Porter & L.A.Johnson | Polemoniaceae | 8 |
| Leptosiphon septentrionalis | (H.Mason) J.M.Porter & L.A.Johnson | Polemoniaceae | 8 |
| Lessingia arachnoidea | Greene | Asteraceae | 8 |
| Lessingia germanorum | Cham. | Asteraceae | 8 |
| Lessingia glandulifera | A.Gray | Asteraceae | 8 |
| Lessingia hololeuca | Greene | Asteraceae | 8 |
| Lessingia leptoclada | A.Gray | Asteraceae | 8 |
| Lessingia nemaclada | Greene | Asteraceae | 8 |
| Lessingia pectinata | Greene | Asteraceae | 8 |
| Lessingia ramulosa | A.Gray | Asteraceae | 8 |
| Lessingia tenuis | (A.Gray) Coville | Asteraceae | 8 |
| Lessingia virgata | A.Gray | Asteraceae | 8 |
| Leucocrinum montanum | Nutt. ex A.Gray | Asparagaceae | 8 |
| Leucophysalis nana | (A.Gray) Averett | Solanaceae | 8 |
| Leucosyris carnosa | (A.Gray) Greene | Asteraceae | 8 |
| Leucothoe davisiae | Torr. ex A.Gray | Ericaceae | 8 |
| Lewisia brachycalyx | Engelm. ex A.Gray | Montiaceae | 8 |
| Lewisia cantelovii | J.T.Howell | Montiaceae | 8 |
| Lewisia cotyledon | (S.Watson) B.L.Rob. | Montiaceae | 8 |
| Lewisia disepala | Rydb. | Montiaceae | 8 |
| Lewisia leeana | (Porter) B.L.Rob. | Montiaceae | 8 |
| Lewisia longipetala | (Piper) S.Clay | Montiaceae | 8 |
| Lewisia nevadensis | (A.Gray) B.L.Rob. | Montiaceae | 8 |
| Lewisia oppositifolia | (S.Watson) B.L.Rob. | Montiaceae | 8 |
| Lewisia pygmaea | (A.Gray) B.L.Rob. | Montiaceae | 8 |
| Lewisia rediviva | Pursh | Montiaceae | 8 |
| Leymus cinereus | (Scribn. & Merr.) Á.Löve | Poaceae | 8 |
| Leymus condensatus | (J.Presl) Á.Löve | Poaceae | 8 |
| Leymus mollis | (Trin.) Pilg. | Poaceae | 8 |
| Leymus triticoides | (Buckley) Pilg. | Poaceae | 8 |
| Ligusticum grayi | J.M.Coult. & Rose | Apiaceae | 8 |
| Lilaeopsis occidentalis | J.M.Coult. & Rose | Apiaceae | 8 |
| Lilium bolanderi | S.Watson | Liliaceae | 8 |
| Lilium columbianum | Leichtlin | Liliaceae | 8 |
| Lilium humboldtii | Leichtlin | Liliaceae | 8 |
| Lilium kelleyanum | Lemmon | Liliaceae | 8 |
| Lilium kelloggii | Purdy | Liliaceae | 8 |
| Lilium maritimum | Kellogg | Liliaceae | 8 |
| Lilium pardalinum | Kellogg | Liliaceae | 8 |
| Lilium parryi | S.Watson | Liliaceae | 8 |
| Lilium parvum | Kellogg | Liliaceae | 8 |
| Lilium rubescens | S.Watson | Liliaceae | 8 |
| Lilium washingtonianum | Kellogg | Liliaceae | 8 |
| Limnanthes alba | Hartw. ex Benth. | Limnanthaceae | 8 |
| Limnanthes douglasii | R.Br. | Limnanthaceae | 8 |
| Limonium californicum | (Boiss.) A.Heller | Plumbaginaceae | 8 |
| Limosella aquatica | L. | Plantaginaceae | 8 |
| Linanthus bellus | (A.Gray) Greene | Polemoniaceae | 8 |
| Linanthus californicus | (Hook. & Arn.) J.M.Porter & L.A.Johnson | Polemoniaceae | 8 |
| Linanthus campanulatus | (A.Gray) J.M.Porter & L.A.Johnson | Polemoniaceae | 8 |
| Linanthus concinnus | Milliken | Polemoniaceae | 8 |
| Linanthus demissus | (A.Gray) Greene | Polemoniaceae | 8 |
| Linanthus dianthiflorus | (Benth.) Greene | Polemoniaceae | 8 |
| Linanthus dichotomus | Benth. | Polemoniaceae | 8 |
| Linanthus filiformis | (Parry ex A.Gray) J.M.Porter & L.A.Johnson | Polemoniaceae | 8 |
| Linanthus inyoensis | (I.M.Johnst.) J.M.Porter & L.A.Johnson | Polemoniaceae | 8 |
| Linanthus jonesii | (A.Gray) Greene | Polemoniaceae | 8 |
| Linanthus killipii | H.Mason | Polemoniaceae | 8 |
| Linanthus orcuttii | (Parry) Jeps. | Polemoniaceae | 8 |
| Linanthus parryae | (A.Gray) Greene | Polemoniaceae | 8 |
| Linanthus pungens | (Torr.) J.M.Porter & L.A.Johnson | Polemoniaceae | 8 |
| Lindernia dubia | (L.) Pennell | Linderniaceae | 8 |
| Linnaea borealis | L. | Caprifoliaceae | 8 |
| Linum adenophyllum | A.Gray | Linaceae | 8 |
| Linum breweri | A.Gray | Linaceae | 8 |
| Linum californicum | Benth. | Linaceae | 8 |
| Linum congestum | A.Gray | Linaceae | 8 |
| Linum lewisii | Pursh | Linaceae | 8 |
| Linum micranthum | A.Gray | Linaceae | 8 |
| Linum puberulum | (Engelm.) A.Heller | Linaceae | 8 |
| Lithophragma affine | A.Gray | Saxifragaceae | 8 |
| Lithophragma bolanderi | A.Gray | Saxifragaceae | 8 |
| Lithophragma campanulatum | Howell | Saxifragaceae | 8 |
| Lithophragma cymbalaria | Torr. & A.Gray | Saxifragaceae | 8 |
| Lithophragma glabrum | Nutt. | Saxifragaceae | 8 |
| Lithophragma heterophyllum | (Hook. & Arn.) Hook. & Arn. | Saxifragaceae | 8 |
| Lithophragma parviflorum | (Hook.) Nutt. | Saxifragaceae | 8 |
| Lithophragma tenellum | Nutt. | Saxifragaceae | 8 |
| Lithophragma trifoliatum | Eastw. | Saxifragaceae | 8 |
| Lithospermum californicum | A.Gray | Boraginaceae | 8 |
| Lithospermum incisum | Lehm. | Boraginaceae | 8 |
| Lithospermum ruderale | Douglas ex Lehm. | Boraginaceae | 8 |
| Lobelia cardinalis | L. | Campanulaceae | 8 |
| Loeflingia squarrosa | Nutt. | Caryophyllaceae | 8 |
| Loeseliastrum depressum | (M.E.Jones ex A.Gray) J.M.Porter & L.A.Johnson | Polemoniaceae | 8 |
| Loeseliastrum matthewsii | (A.Gray) Timbrook | Polemoniaceae | 8 |
| Loeseliastrum schottii | (Torr.) Timbrook | Polemoniaceae | 8 |
| Logfia arizonica | (A.Gray) Holub | Asteraceae | 8 |
| Logfia depressa | (A.Gray) Holub | Asteraceae | 8 |
| Lomatium austiniae | (J.M.Coult. & Rose) J.M.Coult. & Rose | Apiaceae | 8 |
| Lomatium californicum | (Nutt. ex Torr. & A.Gray) Mathias & Constance | Apiaceae | 8 |
| Lomatium canbyi | (J.M.Coult. & Rose) J.M.Coult. & Rose | Apiaceae | 8 |
| Lomatium caruifolium | (Hook. & Arn.) J.M.Coult. & Rose | Apiaceae | 8 |
| Lomatium dasycarpum | (Torr. & A.Gray) J.M.Coult. & Rose | Apiaceae | 8 |
| Lomatium dissectum | (Nutt.) Mathias & Constance | Apiaceae | 8 |
| Lomatium donnellii | (J.M.Coult. & Rose) J.M.Coult. & Rose | Apiaceae | 8 |
| Lomatium engelmannii | Mathias | Apiaceae | 8 |
| Lomatium foeniculaceum | (Nutt.) J.M.Coult. & Rose | Apiaceae | 8 |
| Lomatium fusiformis | (S.Watson) J.F.Sm. & Mansfield | Apiaceae | 8 |
| Lomatium hallii | (S.Watson) J.M.Coult. & Rose | Apiaceae | 8 |
| Lomatium hendersonii | (J.M.Coult. & Rose) J.M.Coult. & Rose | Apiaceae | 8 |
| Lomatium hooveri | (Mathias & Constance) Constance & Ertter | Apiaceae | 8 |
| Lomatium howellii | (S.Watson) Jeps. | Apiaceae | 8 |
| Lomatium insulare | (Eastw.) Munz | Apiaceae | 8 |
| Lomatium lucidum | (Nutt.) Jeps. | Apiaceae | 8 |
| Lomatium marginatum | (Benth.) J.M.Coult. & Rose | Apiaceae | 8 |
| Lomatium martindalei | (J.M.Coult. & Rose) J.M.Coult. & Rose | Apiaceae | 8 |
| Lomatium mohavense | (J.M.Coult. & Rose) J.M.Coult. & Rose | Apiaceae | 8 |
| Lomatium multifidum | (Nutt.) R.P.McNeill & Darrach | Apiaceae | 8 |
| Lomatium nevadense | (S.Watson) J.M.Coult. & Rose | Apiaceae | 8 |
| Lomatium nudicaule | (Nutt.) J.M.Coult. & Rose | Apiaceae | 8 |
| Lomatium papilioniferum | J.A.Alexander & Whaley | Apiaceae | 8 |
| Lomatium parryi | (S.Watson) J.F.Macbr. | Apiaceae | 8 |
| Lomatium parvifolium | (Hook. & Arn.) Jeps. | Apiaceae | 8 |
| Lomatium piperi | J.M.Coult. & Rose | Apiaceae | 8 |
| Lomatium rigidum | (M.E.Jones) Jeps. | Apiaceae | 8 |
| Lomatium triternatum | (Pursh) J.M.Coult. & Rose | Apiaceae | 8 |
| Lomatium utriculatum | (Nutt. ex Torr. & A.Gray) J.M.Coult. & Rose | Apiaceae | 8 |
| Lomatium vaginatum | J.M.Coult. & Rose | Apiaceae | 8 |
| Lonicera caerulea | L. | Caprifoliaceae | 8 |
| Lonicera conjugialis | Kellogg | Caprifoliaceae | 8 |
| Lonicera interrupta | Benth. | Caprifoliaceae | 8 |
| Lonicera involucrata | (Richardson) Banks ex Spreng. | Caprifoliaceae | 8 |
| Lonicera subspicata | Hook. & Arn. | Caprifoliaceae | 8 |
| Ludwigia grandiflora | (Michx.) Greuter & Burdet | Onagraceae | 8 |
| Ludwigia hexapetala | (Hook. & Arn.) Zardini, H.Y.Gu & P.H.Raven | Onagraceae | 8 |
| Ludwigia palustris | (L.) Elliott | Onagraceae | 8 |
| Ludwigia peploides | (Kunth) P.H.Raven | Onagraceae | 8 |
| Ludwigia repens | J.R.Forst. | Onagraceae | 8 |
| Luetkea pectinata | (Pursh) Kuntze | Rosaceae | 8 |
| Luina hypoleuca | Benth. | Asteraceae | 8 |
| Lupinus affinis | J.Agardh | Fabaceae | 8 |
| Lupinus albicaulis | Douglas | Fabaceae | 8 |
| Lupinus albifrons | Benth. | Fabaceae | 8 |
| Lupinus angustiflorus | Eastw. | Fabaceae | 8 |
| Lupinus arboreus | Sims | Fabaceae | 8 |
| Lupinus arbustus | Douglas | Fabaceae | 8 |
| Lupinus argenteus | Pursh | Fabaceae | 8 |
| Lupinus arizonicus | (S.Watson) S.Watson | Fabaceae | 8 |
| Lupinus benthamii | A.Heller | Fabaceae | 8 |
| Lupinus bicolor | Lindl. | Fabaceae | 8 |
| Lupinus brevicaulis | S.Watson | Fabaceae | 8 |
| Lupinus breweri | A.Gray | Fabaceae | 8 |
| Lupinus caudatus | Kellogg | Fabaceae | 8 |
| Lupinus cervinus | Kellogg | Fabaceae | 8 |
| Lupinus chamissonis | Eschsch. | Fabaceae | 8 |
| Lupinus concinnus | J.Agardh | Fabaceae | 8 |
| Lupinus croceus | Eastw. | Fabaceae | 8 |
| Lupinus duranii | Eastw. | Fabaceae | 8 |
| Lupinus excubitus | M.E.Jones | Fabaceae | 8 |
| Lupinus flavoculatus | A.Heller | Fabaceae | 8 |
| Lupinus formosus | Greene | Fabaceae | 8 |
| Lupinus grayi | S.Watson | Fabaceae | 8 |
| Lupinus guadalupensis | Greene | Fabaceae | 8 |
| Lupinus hirsutissimus | Benth. | Fabaceae | 8 |
| Lupinus hyacinthinus | Greene | Fabaceae | 8 |
| Lupinus latifolius | Lindl. ex J.Agardh | Fabaceae | 8 |
| Lupinus leucophyllus | Douglas ex Lindl. | Fabaceae | 8 |
| Lupinus littoralis | Douglas ex Lindl. | Fabaceae | 8 |
| Lupinus longifolius | (S.Watson) Abrams | Fabaceae | 8 |
| Lupinus luteolus | Kellogg | Fabaceae | 8 |
| Lupinus meionanthus | A.Gray | Fabaceae | 8 |
| Lupinus microcarpus | Sims | Fabaceae | 8 |
| Lupinus nanus | Douglas ex Benth. | Fabaceae | 8 |
| Lupinus nevadensis | A.Heller | Fabaceae | 8 |
| Lupinus obtusilobus | A.Heller | Fabaceae | 8 |
| Lupinus padre-crowleyi | C.P.Sm. | Fabaceae | 8 |
| Lupinus polyphyllus | Lindl. | Fabaceae | 8 |
| Lupinus pusillus | Pursh | Fabaceae | 8 |
| Lupinus rivularis | Douglas ex Lindl. | Fabaceae | 8 |
| Lupinus saxosus | Howell | Fabaceae | 8 |
| Lupinus sericatus | Kellogg | Fabaceae | 8 |
| Lupinus shockleyi | S.Watson | Fabaceae | 8 |
| Lupinus sparsiflorus | Benth. | Fabaceae | 8 |
| Lupinus spectabilis | Hoover | Fabaceae | 8 |
| Lupinus succulentus | Douglas ex K.Koch | Fabaceae | 8 |
| Lupinus tidestromii | Greene | Fabaceae | 8 |
| Lupinus truncatus | Nutt. ex Hook. & Arn. | Fabaceae | 8 |
| Lupinus variicolor | Steud. | Fabaceae | 8 |
| Luzula comosa | E.Mey. | Juncaceae | 8 |
| Luzula macrantha | (S.Watson) Zika & B.L.Wilson | Juncaceae | 8 |
| Luzula orestera | Sharsm. | Juncaceae | 8 |
| Luzula parviflora | (Ehrh.) Desv. | Juncaceae | 8 |
| Luzula spicata | (L.) DC. | Juncaceae | 8 |
| Luzula subsessilis | (S.Watson) Buchenau | Juncaceae | 8 |
| Lycium andersonii | A.Gray | Solanaceae | 8 |
| Lycium brevipes | Benth. | Solanaceae | 8 |
| Lycium californicum | Nutt. ex A.Gray | Solanaceae | 8 |
| Lycium cooperi | A.Gray | Solanaceae | 8 |
| Lycium fremontii | A.Gray | Solanaceae | 8 |
| Lycium pallidum | Miers | Solanaceae | 8 |
| Lycium parishii | A.Gray | Solanaceae | 8 |
| Lycium torreyi | A.Gray | Solanaceae | 8 |
| Lycopodiella inundata | (L.) Holub | Lycopodiaceae | 8 |
| Lycopodium clavatum | L. | Lycopodiaceae | 8 |
| Lycopus americanus | Muhl. ex W.P.C.Barton | Lamiaceae | 8 |
| Lycopus asper | Greene | Lamiaceae | 8 |
| Lycopus uniflorus | Michx. | Lamiaceae | 8 |
| Lyrocarpa coulteri | Hook. & Harv. | Brassicaceae | 8 |
| Lysichiton americanus | Hultén & H.St.John | Araceae | 8 |
| Lysimachia europaea | (L.) U.Manns & Anderb. | Primulaceae | 8 |
| Lysimachia latifolia | (Hook.) Cholewa | Primulaceae | 8 |
| Lysimachia maritima | (L.) Galasso, Banfi & Soldano | Primulaceae | 8 |
| Lysimachia minima | (L.) U.Manns & Anderb. | Primulaceae | 8 |
| Lysimachia thyrsiflora | L. | Primulaceae | 8 |
| Lythrum californicum | Torr. & A.Gray | Lythraceae | 8 |
| Machaeranthera tanacetifolia | (Kunth) Nees | Asteraceae | 8 |
| Madia citriodora | Greene | Asteraceae | 8 |
| Madia elegans | D.Don | Asteraceae | 8 |
| Madia exigua | (Sm.) Greene | Asteraceae | 8 |
| Madia glomerata | Hook. | Asteraceae | 8 |
| Madia gracilis | (Sm.) D.D.Keck & J.C.Clausen ex Applegate | Asteraceae | 8 |
| Madia sativa | Molina | Asteraceae | 8 |
| Maianthemum dilatatum | (Alph.Wood) A.Nelson & J.F.Macbr. | Asparagaceae | 8 |
| Maianthemum racemosum | (L.) Link | Asparagaceae | 8 |
| Maianthemum stellatum | (L.) Link | Asparagaceae | 8 |
| Malacothamnus abbottii | (Eastw.) Kearney | Malvaceae | 8 |
| Malacothamnus aboriginum | (B.L.Rob.) Greene | Malvaceae | 8 |
| Malacothamnus arcuatus | (Greene) Greene | Malvaceae | 8 |
| Malacothamnus clementinus | (Munz & I.M.Johnst.) Kearney | Malvaceae | 8 |
| Malacothamnus davidsonii | (B.L.Rob.) Greene | Malvaceae | 8 |
| Malacothamnus densiflorus | (S.Watson) Greene | Malvaceae | 8 |
| Malacothamnus enigmaticus | K.Morse & T.Chester | Malvaceae | 8 |
| Malacothamnus fasciculatus | (Nutt. ex Torr. & A.Gray) Greene | Malvaceae | 8 |
| Malacothamnus fremontii | Greene | Malvaceae | 8 |
| Malacothamnus marrubioides | (Durand & Hilg.) Greene | Malvaceae | 8 |
| Malacothamnus nuttallii | Abrams | Malvaceae | 8 |
| Malacothamnus orbiculatus | (Greene) Greene | Malvaceae | 8 |
| Malacothrix californica | DC. | Asteraceae | 8 |
| Malacothrix clevelandii | A.Gray | Asteraceae | 8 |
| Malacothrix coulteri | Harv. & A.Gray | Asteraceae | 8 |
| Malacothrix floccifera | (DC.) S.F.Blake | Asteraceae | 8 |
| Malacothrix foliosa | A.Gray | Asteraceae | 8 |
| Malacothrix glabrata | (A.Gray ex D.C.Eaton) A.Gray | Asteraceae | 8 |
| Malacothrix incana | (Nutt.) Torr. & A.Gray | Asteraceae | 8 |
| Malacothrix saxatilis | (Nutt.) Torr. & A.Gray | Asteraceae | 8 |
| Malacothrix sonchoides | (Nutt.) Torr. & A.Gray | Asteraceae | 8 |
| Malacothrix stebbinsii | W.S.Davis & P.H.Raven | Asteraceae | 8 |
| Malacothrix torreyi | A.Gray | Asteraceae | 8 |
| Malosma laurina | (Nutt.) Nutt. ex Abrams | Anacardiaceae | 8 |
| Malperia tenuis | S.Watson | Asteraceae | 8 |
| Malus fusca | (Raf.) C.K.Schneid. | Rosaceae | 8 |
| Malva assurgentiflora | (Kellogg) M.F.Ray | Malvaceae | 8 |
| Malvella leprosa | (Ortega) Krapov. | Malvaceae | 8 |
| Marah fabacea | (Naudin) Greene | Cucurbitaceae | 8 |
| Marah horrida | (Congdon) Dunn | Cucurbitaceae | 8 |
| Marah macrocarpa | (Greene) Greene | Cucurbitaceae | 8 |
| Marah oregana | (Torr. & A.Gray) Howell | Cucurbitaceae | 8 |
| Marah watsonii | (Cogn.) Greene | Cucurbitaceae | 8 |
| Marsilea vestita | Hook. & Grev. | Marsileaceae | 8 |
| Matricaria discoidea | DC. | Asteraceae | 8 |
| Maurandella antirrhiniflora | (Humb. & Bonpl. ex Willd.) Rothm. | Plantaginaceae | 8 |
| Meconella californica | Torr. & Frém. | Papaveraceae | 8 |
| Meconella denticulata | Greene | Papaveraceae | 8 |
| Meconella oregana | Nutt. | Papaveraceae | 8 |
| Melica bulbosa | Porter & J.M.Coult. | Poaceae | 8 |
| Melica californica | Scribn. | Poaceae | 8 |
| Melica frutescens | Scribn. | Poaceae | 8 |
| Melica harfordii | Bol. | Poaceae | 8 |
| Melica imperfecta | Trin. | Poaceae | 8 |
| Melica stricta | Bol. | Poaceae | 8 |
| Melica subulata | (Griseb.) Scribn. | Poaceae | 8 |
| Melica torreyana | Scribn. | Poaceae | 8 |
| Menodora spinescens | A.Gray | Oleaceae | 8 |
| Mentha canadensis | L. | Lamiaceae | 8 |
| Mentzelia adhaerens | Benth. | Loasaceae | 8 |
| Mentzelia affinis | Greene | Loasaceae | 8 |
| Mentzelia albicaulis | (Douglas ex Hook.) Douglas ex Torr. & A.Gray | Loasaceae | 8 |
| Mentzelia congesta | (Nutt.) Torr. & A.Gray | Loasaceae | 8 |
| Mentzelia crocea | Kellogg | Loasaceae | 8 |
| Mentzelia dispersa | S.Watson | Loasaceae | 8 |
| Mentzelia gracilenta | Torr. & A.Gray | Loasaceae | 8 |
| Mentzelia hirsutissima | S.Watson | Loasaceae | 8 |
| Mentzelia involucrata | S.Watson | Loasaceae | 8 |
| Mentzelia inyoensis | H.J.Thomps. & Prigge | Loasaceae | 8 |
| Mentzelia laevicaulis | (Douglas ex Hook.) Torr. & A.Gray | Loasaceae | 8 |
| Mentzelia lindleyi | Torr. & A.Gray | Loasaceae | 8 |
| Mentzelia longiloba | J.Darl. | Loasaceae | 8 |
| Mentzelia micrantha | (Hook. & Arn.) Torr. & A.Gray | Loasaceae | 8 |
| Mentzelia montana | (Davidson) Davidson | Loasaceae | 8 |
| Mentzelia nitens | Greene | Loasaceae | 8 |
| Mentzelia oreophila | J.Darl. | Loasaceae | 8 |
| Mentzelia pectinata | Kellogg | Loasaceae | 8 |
| Mentzelia puberula | J.Darl. | Loasaceae | 8 |
| Mentzelia reflexa | Coville | Loasaceae | 8 |
| Mentzelia torreyi | A.Gray | Loasaceae | 8 |
| Mentzelia tricuspis | A.Gray | Loasaceae | 8 |
| Mentzelia veatchiana | Kellogg | Loasaceae | 8 |
| Menyanthes trifoliata | L. | Menyanthaceae | 8 |
| Mertensia ciliata | (E.James ex Torr.) G.Don | Boraginaceae | 8 |
| Mertensia franciscana | A.Heller | Boraginaceae | 8 |
| Mertensia longiflora | Greene | Boraginaceae | 8 |
| Micranthes aprica | (Greene) Small | Saxifragaceae | 8 |
| Micranthes bryophora | (A.Gray) Brouillet & Gornall | Saxifragaceae | 8 |
| Micranthes californica | (Greene) Small | Saxifragaceae | 8 |
| Micranthes ferruginea | (Graham) Brouillet & Gornall | Saxifragaceae | 8 |
| Micranthes howellii | Small | Saxifragaceae | 8 |
| Micranthes integrifolia | (Hook.) Small | Saxifragaceae | 8 |
| Micranthes marshallii | Small | Saxifragaceae | 8 |
| Micranthes mertensiana | Rosend. | Saxifragaceae | 8 |
| Micranthes nidifica | (Greene) Small | Saxifragaceae | 8 |
| Micranthes odontoloma | A.Heller | Saxifragaceae | 8 |
| Micranthes oregana | (Howell) Small | Saxifragaceae | 8 |
| Micranthes rufidula | Small | Saxifragaceae | 8 |
| Micranthes tolmiei | (Torr. & A.Gray) Brouillet & Gornall | Saxifragaceae | 8 |
| Micromeria douglasii | Benth. | Lamiaceae | 8 |
| Micropuntia pulchella | (Engelm.) M.P.Griff. | Cactaceae | 8 |
| Micropus californicus | Fisch. & C.A.Mey. | Asteraceae | 8 |
| Microseris douglasii | (DC.) Sch.Bip. | Asteraceae | 8 |
| Microseris laciniata | (Hook.) Sch.Bip. | Asteraceae | 8 |
| Microseris nutans | (Hook.) Sch.Bip. | Asteraceae | 8 |
| Microseris paludosa | (Greene) J.T.Howell | Asteraceae | 8 |
| Microseris sylvatica | (Benth.) Sch.Bip. | Asteraceae | 8 |
| Microsteris gracilis | (Hook.) Greene | Polemoniaceae | 8 |
| Mimetanthe pilosa | (Benth.) Greene | Phrymaceae | 8 |
| Mirabilis albida | (Walter) Heimerl | Nyctaginaceae | 8 |
| Mirabilis alipes | (S.Watson) Pilz | Nyctaginaceae | 8 |
| Mirabilis coccinea | (Torr.) Benth. & Hook.f. | Nyctaginaceae | 8 |
| Mirabilis comata | (Small) Standl. | Nyctaginaceae | 8 |
| Mirabilis laevis | (Benth.) Curran | Nyctaginaceae | 8 |
| Mirabilis linearis | (Pursh) Heimerl | Nyctaginaceae | 8 |
| Mirabilis multiflora | (Torr.) A.Gray | Nyctaginaceae | 8 |
| Mirabilis tenuiloba | S.Watson | Nyctaginaceae | 8 |
| Mitellastra caulescens | (Nutt.) Howell | Saxifragaceae | 8 |
| Moehringia macrophylla | (Hook.) Fenzl | Caryophyllaceae | 8 |
| Mohavea breviflora | Coville | Plantaginaceae | 8 |
| Mohavea confertiflora | (Benth.) Jeps. | Plantaginaceae | 8 |
| Mollugo verticillata | L. | Molluginaceae | 8 |
| Monarda pectinata | Nutt. | Lamiaceae | 8 |
| Monardella breweri | A.Gray | Lamiaceae | 8 |
| Monardella douglasii | Benth. | Lamiaceae | 8 |
| Monardella exilis | (A.Gray) Greene | Lamiaceae | 8 |
| Monardella macrantha | A.Gray | Lamiaceae | 8 |
| Monardella nana | A.Gray | Lamiaceae | 8 |
| Monardella odoratissima | Benth. | Lamiaceae | 8 |
| Monardella purpurea | Howell | Lamiaceae | 8 |
| Monardella sinuata | Elvin & A.C.Sanders | Lamiaceae | 8 |
| Moneses uniflora | (L.) A.Gray | Ericaceae | 8 |
| Monolopia congdonii | (A.Gray) B.G.Baldwin | Asteraceae | 8 |
| Monolopia gracilens | A.Gray | Asteraceae | 8 |
| Monolopia lanceolata | Nutt. | Asteraceae | 8 |
| Monolopia major | DC. | Asteraceae | 8 |
| Monolopia stricta | Crum | Asteraceae | 8 |
| Monoptilon bellioides | H.M.Hall | Asteraceae | 8 |
| Monotropa uniflora | L. | Ericaceae | 8 |
| Montia chamissoi | (Ledeb. ex Spreng.) Greene | Montiaceae | 8 |
| Montia fontana | L. | Montiaceae | 8 |
| Montia howellii | S.Watson | Montiaceae | 8 |
| Montia linearis | (Douglas ex Hook.) Greene | Montiaceae | 8 |
| Montia parvifolia | (Moc. ex DC.) Greene | Montiaceae | 8 |
| Mortonia utahensis | (Coville) A.Nelson | Celastraceae | 8 |
| Mucronea californica | Benth. | Polygonaceae | 8 |
| Mucronea perfoliata | (A.Gray) A.Heller | Polygonaceae | 8 |
| Muehlenbeckia hastulata | (Sm.) I.M.Johnst. | Polygonaceae | 8 |
| Muenchhusia moscheutos | (L.) M.M.Hanes & R.L.Barrett | Malvaceae | 8 |
| Muhlenbergia alopecuroides | (Griseb.) P.M.Peterson & Columbus | Poaceae | 8 |
| Muhlenbergia asperifolia | (Nees & Meyen ex Trin.) Parodi | Poaceae | 8 |
| Muhlenbergia mexicana | (L.) Trin. | Poaceae | 8 |
| Muhlenbergia microsperma | Trin. | Poaceae | 8 |
| Muhlenbergia minutissima | (Steud.) Swallen | Poaceae | 8 |
| Muhlenbergia montana | (Nutt.) Hitchc. | Poaceae | 8 |
| Muhlenbergia paniculata | (Nutt.) P.M.Peterson | Poaceae | 8 |
| Muhlenbergia porteri | Scribn. | Poaceae | 8 |
| Muhlenbergia richardsonis | (Trin.) Rydb. | Poaceae | 8 |
| Muhlenbergia rigens | (Benth.) Hitchc. | Poaceae | 8 |
| Muhlenbergia schreberi | J.F.Gmel. | Poaceae | 8 |
| Muhlenbergia tricholepis | (Torr.) P.M.Peterson | Poaceae | 8 |
| Muhlenbergia utilis | (Torr.) Hitchc. | Poaceae | 8 |
| Muilla coronata | Greene | Asparagaceae | 8 |
| Muilla transmontana | Greene | Asparagaceae | 8 |
| Munroa pulchella | (Kunth) Amarilla | Poaceae | 8 |
| Munroa squarrosa | (Nutt.) Torr. | Poaceae | 8 |
| Myosotis laxa | Lehm. | Boraginaceae | 8 |
| Myosotis verna | Nutt. | Boraginaceae | 8 |
| Myrica californica | Cham. | Myricaceae | 8 |
| Myriophyllum hippuroides | Nutt. ex Torr. & A.Gray | Haloragaceae | 8 |
| Myriophyllum quitense | Kunth | Haloragaceae | 8 |
| Myriophyllum sibiricum | Kom. | Haloragaceae | 8 |
| Myriophyllum verticillatum | L. | Haloragaceae | 8 |
| Myriopteris clevelandii | (D.C.Eaton) Grusz & Windham | Pteridaceae | 8 |
| Myriopteris cooperae | (D.C.Eaton) Grusz & Windham | Pteridaceae | 8 |
| Myriopteris covillei | (Maxon) Á.Löve & D.Löve | Pteridaceae | 8 |
| Myriopteris gracillima | J.Sm. | Pteridaceae | 8 |
| Myriopteris intertexta | (Maxon) Grusz & Windham | Pteridaceae | 8 |
| Myriopteris newberryi | (D.C.Eaton) Grusz & Windham | Pteridaceae | 8 |
| Myriopteris parryi | (D.C.Eaton) Grusz & Windham | Pteridaceae | 8 |
| Myriopteris viscida | (Davenp.) Grusz & Windham | Pteridaceae | 8 |
| Myriopteris wootonii | (Maxon) Grusz & Windham | Pteridaceae | 8 |
| Najas flexilis | (Willd.) Rostk. & W.L.E.Schmidt | Hydrocharitaceae | 8 |
| Najas guadalupensis | (Spreng.) Magnus | Hydrocharitaceae | 8 |
| Najas marina | L. | Hydrocharitaceae | 8 |
| Nama aretioides | (Hook. & Arn.) Brand | Namaceae | 8 |
| Nama demissa | A.Gray | Namaceae | 8 |
| Nama densa | Lemmon | Namaceae | 8 |
| Nama dichotoma | (Ruiz & Pav.) Choisy | Namaceae | 8 |
| Nama hispida | A.Gray | Namaceae | 8 |
| Nama lobbii | A.Gray | Namaceae | 8 |
| Nama pusilla | Lemmon ex A.Gray | Namaceae | 8 |
| Nama rothrockii | A.Gray | Namaceae | 8 |
| Nama stenocarpa | A.Gray | Namaceae | 8 |
| Narthecium californicum | Baker | Nartheciaceae | 8 |
| Nassella lepida | (Hitchc.) Barkworth | Poaceae | 8 |
| Nassella pulchra | (Hitchc.) Barkworth | Poaceae | 8 |
| Nassella viridula | (Trin.) Barkworth | Poaceae | 8 |
| Navarretia atractyloides | Hook. & Arn. | Polemoniaceae | 8 |
| Navarretia breweri | (A.Gray) Greene | Polemoniaceae | 8 |
| Navarretia capillaris | (Kellogg) Kuntze | Polemoniaceae | 8 |
| Navarretia cotulifolia | (Benth.) Hook. & Arn. | Polemoniaceae | 8 |
| Navarretia divaricata | Greene | Polemoniaceae | 8 |
| Navarretia fossalis | Moran | Polemoniaceae | 8 |
| Navarretia hamata | Greene | Polemoniaceae | 8 |
| Navarretia heterodoxa | (Greene) Greene | Polemoniaceae | 8 |
| Navarretia intertexta | Hook. | Polemoniaceae | 8 |
| Navarretia jepsonii | V.L.Bailey ex Jeps. | Polemoniaceae | 8 |
| Navarretia leptalea | (A.Gray) L.A.Johnson | Polemoniaceae | 8 |
| Navarretia leucocephala | Benth. | Polemoniaceae | 8 |
| Navarretia mellita | Greene | Polemoniaceae | 8 |
| Navarretia peninsularis | Greene | Polemoniaceae | 8 |
| Navarretia pubescens | (Benth.) Hook. & Arn. | Polemoniaceae | 8 |
| Navarretia rosulata | Brand | Polemoniaceae | 8 |
| Navarretia squarrosa | (Eschsch.) Hook. & Arn. | Polemoniaceae | 8 |
| Navarretia tagetina | Greene | Polemoniaceae | 8 |
| Navarretia torreyella | L.A.Johnson & D.Gowen | Polemoniaceae | 8 |
| Navarretia viscidula | Benth. | Polemoniaceae | 8 |
| Neltuma odorata | (Torr. & Frém.) C.E.Hughes & G.P.Lewis | Fabaceae | 8 |
| Nemacaulis denudata | Nutt. | Polygonaceae | 8 |
| Nemacladus glanduliferus | Jeps. | Campanulaceae | 8 |
| Nemacladus interior | (Munz) G.T.Robbins | Campanulaceae | 8 |
| Nemacladus montanus | Greene | Campanulaceae | 8 |
| Nemacladus orientalis | (McVaugh) Morin | Campanulaceae | 8 |
| Nemacladus pinnatifidus | Greene | Campanulaceae | 8 |
| Nemacladus ramosissimus | Nutt. | Campanulaceae | 8 |
| Nemacladus rubescens | Greene | Campanulaceae | 8 |
| Nemacladus secundiflorus | G.T.Robbins | Campanulaceae | 8 |
| Nemacladus sigmoideus | G.T.Robbins | Campanulaceae | 8 |
| Nemophila breviflora | A.Gray | Hydrophyllaceae | 8 |
| Nemophila heterophylla | Fisch. & C.A.Mey. | Hydrophyllaceae | 8 |
| Nemophila maculata | Benth. ex Lindl. | Hydrophyllaceae | 8 |
| Nemophila menziesii | Hook. & Arn. | Hydrophyllaceae | 8 |
| Nemophila parviflora | Douglas ex Benth. | Hydrophyllaceae | 8 |
| Nemophila pedunculata | Douglas ex Benth. | Hydrophyllaceae | 8 |
| Nemophila pulchella | Eastw. | Hydrophyllaceae | 8 |
| Neogaerrhinum filipes | (A.Gray) Rothm. | Plantaginaceae | 8 |
| Neogaerrhinum strictum | (Hook. & Arn.) Rothm. | Plantaginaceae | 8 |
| Neoholmgrenia andina | (Nutt.) W.L.Wagner & Hoch | Onagraceae | 8 |
| Neokochia americana | (S.Watson) G.L.Chu & S.C.Sand. | Chenopodiaceae | 8 |
| Neottia banksiana | (Lindl.) Rchb.f. | Orchidaceae | 8 |
| Neottia convallarioides | (Sw.) Rich. | Orchidaceae | 8 |
| Neottia cordata | (L.) Rich. | Orchidaceae | 8 |
| Nestotus stenophyllus | (A.Gray) R.P.Roberts, Urbatsch & Neubig | Asteraceae | 8 |
| Neviusia cliftonii | Shevock, Ertter & D.W.Taylor | Rosaceae | 8 |
| Nicolletia occidentalis | A.Gray | Asteraceae | 8 |
| Nicotiana attenuata | Torr. ex S.Watson | Solanaceae | 8 |
| Nicotiana clevelandii | A.Gray | Solanaceae | 8 |
| Nicotiana obtusifolia | M.Martens & Galeotti | Solanaceae | 8 |
| Nicotiana quadrivalvis | Pursh | Solanaceae | 8 |
| Nitrophila occidentalis | (Moq.) S.Watson | Chenopodiaceae | 8 |
| Noccaea fendleri | (A.Gray) Holub | Brassicaceae | 8 |
| Nolina bigelovii | (Torr.) S.Watson | Asparagaceae | 8 |
| Nolina cismontana | Dice | Asparagaceae | 8 |
| Nolina interrata | Gentry | Asparagaceae | 8 |
| Nolina parryi | S.Watson | Asparagaceae | 8 |
| Nothocalais troximoides | (A.Gray) Greene | Asteraceae | 8 |
| Nothochelone nemorosa | (Douglas ex Lindl.) Straw | Plantaginaceae | 8 |
| Notholithocarpus densiflorus | (Hook. & Arn.) Manos, Cannon & S.H.Oh | Fagaceae | 8 |
| Nuphar polysepala | Engelm. | Nymphaeaceae | 8 |
| Nuttallanthus canadensis | (L.) D.A.Sutton | Plantaginaceae | 8 |
| Nuttallanthus texanus | (Scheele) D.A.Sutton | Plantaginaceae | 8 |
| Odontostomum hartwegii | Torr. | Tecophilaeaceae | 8 |
| Oemleria cerasiformis | (Torr. & A.Gray ex Hook. & Arn.) J.W.Landon | Rosaceae | 8 |
| Oenanthe sarmentosa | Presl ex DC. | Apiaceae | 8 |
| Oenothera avita | (W.M.Klein) W.M.Klein | Onagraceae | 8 |
| Oenothera biennis | L. | Onagraceae | 8 |
| Oenothera cespitosa | Nutt. | Onagraceae | 8 |
| Oenothera deltoides | Torr. & Frém. | Onagraceae | 8 |
| Oenothera elata | Kunth | Onagraceae | 8 |
| Oenothera flava | (A.Nelson) Garrett | Onagraceae | 8 |
| Oenothera primiveris | A.Gray | Onagraceae | 8 |
| Oenothera pubescens | Wild. ex Spreng. | Onagraceae | 8 |
| Oenothera rosea | Aiton | Onagraceae | 8 |
| Oenothera suffrutescens | (Ser.) W.L.Wagner & Hoch | Onagraceae | 8 |
| Oenothera villosa | Thunb. | Onagraceae | 8 |
| Oenothera xylocarpa | Coville | Onagraceae | 8 |
| Oligomeris linifolia | (Vahl ex Hornem.) J.F.Macbr. | Resedaceae | 8 |
| Olneya tesota | A.Gray | Fabaceae | 8 |
| Olsynium douglasii | (A.Dietr.) E.P.Bicknell | Iridaceae | 8 |
| Ophioglossum californicum | Prantl | Ophioglossaceae | 8 |
| Ophioglossum pusillum | Raf. | Ophioglossaceae | 8 |
| Opuntia basilaris | Engelm. & J.M.Bigelow | Cactaceae | 8 |
| Opuntia chlorotica | Engelm. & J.M.Bigelow | Cactaceae | 8 |
| Opuntia curvispina | Griffiths | Cactaceae | 8 |
| Opuntia engelmannii | Salm-Dyck ex Engelm. | Cactaceae | 8 |
| Opuntia fragilis | (Nutt.) Haw. | Cactaceae | 8 |
| Opuntia littoralis | (Engelm.) Cockerell | Cactaceae | 8 |
| Opuntia oricola | Philbrick | Cactaceae | 8 |
| Opuntia phaeacantha | Engelm. | Cactaceae | 8 |
| Opuntia polyacantha | Haw. | Cactaceae | 8 |
| Orcuttia californica | Vasey | Poaceae | 8 |
| Orcuttia tenuis | Hitchc. | Poaceae | 8 |
| Oreocarya abortiva | Greene | Boraginaceae | 8 |
| Oreocarya confertiflora | Greene | Boraginaceae | 8 |
| Oreocarya flavoculata | A.Nelson | Boraginaceae | 8 |
| Oreocarya hoffmannii | (I.M.Johnst.) Abrams | Boraginaceae | 8 |
| Oreocarya humilis | (A.Gray) Greene | Boraginaceae | 8 |
| Oreocarya spiculifera | Piper | Boraginaceae | 8 |
| Oreonana clementis | (M.E.Jones) Jeps. | Apiaceae | 8 |
| Oreonana vestita | Jeps. | Apiaceae | 8 |
| Oreostemma alpigenum | (Torr. & A.Gray) Greene | Asteraceae | 8 |
| Ornithostaphylos oppositifolia | (Parry) Small | Ericaceae | 8 |
| Orobanche bulbosa | Beck | Orobanchaceae | 8 |
| Orobanche californica | Cham. & Schltdl. | Orobanchaceae | 8 |
| Orobanche cooperi | (A.Gray) A.Heller | Orobanchaceae | 8 |
| Orobanche corymbosa | (Rydb.) Ferris | Orobanchaceae | 8 |
| Orobanche fasciculata | Nutt. | Orobanchaceae | 8 |
| Orobanche pinorum | Geyer ex Hook. | Orobanchaceae | 8 |
| Orobanche uniflora | L. | Orobanchaceae | 8 |
| Orobanche vallicola | (Jeps.) Heckard | Orobanchaceae | 8 |
| Orochaenactis thysanocarpha | Coville | Asteraceae | 8 |
| Orthilia secunda | (L.) House | Ericaceae | 8 |
| Orthocarpus bracteosus | Benth. | Orobanchaceae | 8 |
| Orthocarpus cuspidatus | Greene | Orobanchaceae | 8 |
| Orthocarpus imbricatus | S.Watson | Orobanchaceae | 8 |
| Orthocarpus luteus | Nutt. | Orobanchaceae | 8 |
| Oryctes nevadensis | S.Watson | Solanaceae | 8 |
| Osmadenia tenella | Nutt. | Asteraceae | 8 |
| Osmorhiza berteroi | DC. | Apiaceae | 8 |
| Osmorhiza brachypoda | Torr. ex Durand | Apiaceae | 8 |
| Osmorhiza depauperata | Phil. | Apiaceae | 8 |
| Osmorhiza occidentalis | Torr. | Apiaceae | 8 |
| Oxalis californica | (Abrams) R.Knuth | Oxalidaceae | 8 |
| Oxalis latifolia | Kunth | Oxalidaceae | 8 |
| Oxalis oregana | Nutt. | Oxalidaceae | 8 |
| Oxalis pilosa | Nutt. | Oxalidaceae | 8 |
| Oxalis smalliana | R.Knuth | Oxalidaceae | 8 |
| Oxalis suksdorfii | Trel. | Oxalidaceae | 8 |
| Oxalis trilliifolia | Hook. | Oxalidaceae | 8 |
| Oxybaphus nyctagineus | (Michx.) Sweet | Nyctaginaceae | 8 |
| Oxyria digyna | (L.) Hill | Polygonaceae | 8 |
| Oxytheca dendroidea | Nutt. | Polygonaceae | 8 |
| Oxytheca perfoliata | Torr. & A.Gray | Polygonaceae | 8 |
| Oxytheca watsonii | Torr. & A.Gray ex S.Watson | Polygonaceae | 8 |
| Oxytropis borealis | DC. | Fabaceae | 8 |
| Oxytropis deflexa | (Pall.) DC. | Fabaceae | 8 |
| Oxytropis oreophila | A.Gray | Fabaceae | 8 |
| Oxytropis parryi | A.Gray | Fabaceae | 8 |
| Ozomelis trifida | (Graham) Rydb. | Saxifragaceae | 8 |
| Packera breweri | (Burtt Davy) W.A.Weber & Á.Löve | Asteraceae | 8 |
| Packera cana | (Hook.) W.A.Weber & Á.Löve | Asteraceae | 8 |
| Packera greenei | (A.Gray) W.A.Weber & Á.Löve | Asteraceae | 8 |
| Packera indecora | (Greene) Á.Löve & D.Löve | Asteraceae | 8 |
| Packera ionophylla | (Greene) W.A.Weber & Á.Löve | Asteraceae | 8 |
| Packera macounii | (Greene) W.A.Weber & Á.Löve | Asteraceae | 8 |
| Packera pauciflora | (Pursh) Á.Löve & D.Löve | Asteraceae | 8 |
| Packera pseudaurea | (Rydb.) W.A.Weber & Á.Löve | Asteraceae | 8 |
| Packera streptanthifolia | (Greene) W.A.Weber & Á.Löve | Asteraceae | 8 |
| Paeonia brownii | Douglas ex Hook. | Paeoniaceae | 8 |
| Paeonia californica | Nutt. | Paeoniaceae | 8 |
| Palafoxia arida | B.L.Turner & M.I.Morris | Asteraceae | 8 |
| Palmerella debilis | A.Gray | Campanulaceae | 8 |
| Panicum capillare | L. | Poaceae | 8 |
| Panicum dichotomiflorum | Michx. | Poaceae | 8 |
| Panicum hirticaule | J.Presl | Poaceae | 8 |
| Pappostipa speciosa | (Trin. & Rupr.) Romasch. | Poaceae | 8 |
| Parietaria hespera | Hinton | Urticaceae | 8 |
| Parietaria pensylvanica | Muhl. ex Willd. | Urticaceae | 8 |
| Parkinsonia florida | (Benth. ex A.Gray) S.Watson | Fabaceae | 8 |
| Parkinsonia microphylla | Torr. | Fabaceae | 8 |
| Parnassia fimbriata | K.D.Koenig | Celastraceae | 8 |
| Parnassia palustris | L. | Celastraceae | 8 |
| Parnassia parviflora | DC. | Celastraceae | 8 |
| Parthenocissus quinquefolia | (L.) Planch. | Vitaceae | 8 |
| Paspalum distichum | L. | Poaceae | 8 |
| Paxistima myrsinites | (Pursh) Raf. | Celastraceae | 8 |
| Pectiantia pentandra | (Hook.) Rydb. | Saxifragaceae | 8 |
| Pectis papposa | Harv. & Gray | Asteraceae | 8 |
| Pectocarya anisocarpa | Veno | Boraginaceae | 8 |
| Pectocarya heterocarpa | (I.M.Johnst.) I.M.Johnst. | Boraginaceae | 8 |
| Pectocarya linearis | (Ruiz & Pav.) DC. | Boraginaceae | 8 |
| Pectocarya penicillata | (Hook. & Arn.) A.DC. | Boraginaceae | 8 |
| Pectocarya platycarpa | (Munz & I.M.Johnst.) Munz & I.M.Johnst. | Boraginaceae | 8 |
| Pectocarya pusilla | (A.DC.) A.Gray | Boraginaceae | 8 |
| Pectocarya recurvata | I.M.Johnst. | Boraginaceae | 8 |
| Pectocarya setosa | A.Gray | Boraginaceae | 8 |
| Pedicularis attollens | A.Gray | Orobanchaceae | 8 |
| Pedicularis bracteosa | Benth. | Orobanchaceae | 8 |
| Pedicularis centranthera | A.Gray | Orobanchaceae | 8 |
| Pedicularis contorta | Benth. | Orobanchaceae | 8 |
| Pedicularis crenulata | Benth. | Orobanchaceae | 8 |
| Pedicularis densiflora | Benth. | Orobanchaceae | 8 |
| Pedicularis dudleyi | Elmer | Orobanchaceae | 8 |
| Pedicularis groenlandica | Retz. | Orobanchaceae | 8 |
| Pedicularis racemosa | Douglas ex Benth. | Orobanchaceae | 8 |
| Pedicularis rigginsiae | D.J.Keil | Orobanchaceae | 8 |
| Pedicularis semibarbata | A.Gray | Orobanchaceae | 8 |
| Pediomelum californicum | (S.Watson) Rydb. | Fabaceae | 8 |
| Pediomelum castoreum | (S.Watson) Rydb. | Fabaceae | 8 |
| Pelazoneuron puberulum | (Baker) A.R.Sm. & S.E.Fawc. | Thelypteridaceae | 8 |
| Pelecyphora alversonii | (J.M.Coult.) D.Aquino & Dan.Sánchez | Cactaceae | 8 |
| Pelecyphora vivipara | (Nutt.) D.Aquino & Dan.Sánchez | Cactaceae | 8 |
| Pellaea andromedifolia | (Kaulf.) Fée | Pteridaceae | 8 |
| Pellaea brachyptera | (T.Moore) Baker | Pteridaceae | 8 |
| Pellaea bridgesii | Hook. | Pteridaceae | 8 |
| Pellaea mucronata | D.C.Eaton | Pteridaceae | 8 |
| Pellaea truncata | Goodd. | Pteridaceae | 8 |
| Penstemon albomarginatus | M.E.Jones | Plantaginaceae | 8 |
| Penstemon anguineus | Eastw. | Plantaginaceae | 8 |
| Penstemon azureus | Benth. | Plantaginaceae | 8 |
| Penstemon barbatus | (Cav.) Roth | Plantaginaceae | 8 |
| Penstemon barnebyi | N.H.Holmgren | Plantaginaceae | 8 |
| Penstemon bicolor | (Brandegee) Clokey & D.D.Keck | Plantaginaceae | 8 |
| Penstemon caesius | A.Gray | Plantaginaceae | 8 |
| Penstemon calcareus | Brandegee | Plantaginaceae | 8 |
| Penstemon californicus | (Munz & I.M.Johnst.) D.D.Keck | Plantaginaceae | 8 |
| Penstemon centranthifolius | (Benth.) Benth. | Plantaginaceae | 8 |
| Penstemon cinicola | D.D.Keck | Plantaginaceae | 8 |
| Penstemon clevelandii | A.Gray | Plantaginaceae | 8 |
| Penstemon davidsonii | Greene | Plantaginaceae | 8 |
| Penstemon deustus | Douglas | Plantaginaceae | 8 |
| Penstemon eatonii | A.Gray | Plantaginaceae | 8 |
| Penstemon filiformis | (D.D.Keck) D.D.Keck | Plantaginaceae | 8 |
| Penstemon fruticiformis | Coville | Plantaginaceae | 8 |
| Penstemon gracilentus | A.Gray | Plantaginaceae | 8 |
| Penstemon grinnellii | Eastw. | Plantaginaceae | 8 |
| Penstemon heterodoxus | A.Gray | Plantaginaceae | 8 |
| Penstemon heterophyllus | Lindl. | Plantaginaceae | 8 |
| Penstemon humilis | Nutt. ex A.Gray | Plantaginaceae | 8 |
| Penstemon incertus | Brandegee | Plantaginaceae | 8 |
| Penstemon janishiae | N.H.Holmgren | Plantaginaceae | 8 |
| Penstemon labrosus | (A.Gray) Mast. ex Hook.f. | Plantaginaceae | 8 |
| Penstemon laetus | A.Gray | Plantaginaceae | 8 |
| Penstemon monoensis | A.Heller | Plantaginaceae | 8 |
| Penstemon newberryi | A.Gray | Plantaginaceae | 8 |
| Penstemon palmeri | A.Gray | Plantaginaceae | 8 |
| Penstemon papillatus | J.T.Howell | Plantaginaceae | 8 |
| Penstemon parvulus | (A.Gray) Krautter | Plantaginaceae | 8 |
| Penstemon patens | (M.E.Jones) N.H.Holmgren | Plantaginaceae | 8 |
| Penstemon procerus | Douglas ex Graham | Plantaginaceae | 8 |
| Penstemon pseudospectabilis | M.E.Jones | Plantaginaceae | 8 |
| Penstemon purpusii | Brandegee | Plantaginaceae | 8 |
| Penstemon roezlii | Regel | Plantaginaceae | 8 |
| Penstemon rostriflorus | Kellogg | Plantaginaceae | 8 |
| Penstemon rupicola | (Piper) Howell | Plantaginaceae | 8 |
| Penstemon rydbergii | A.Nelson | Plantaginaceae | 8 |
| Penstemon scapoides | D.D.Keck | Plantaginaceae | 8 |
| Penstemon speciosus | Douglas | Plantaginaceae | 8 |
| Penstemon spectabilis | Thurb. ex A.Gray | Plantaginaceae | 8 |
| Penstemon sudans | M.E.Jones | Plantaginaceae | 8 |
| Penstemon thompsoniae | (A.Gray) Rydb. | Plantaginaceae | 8 |
| Penstemon thurberi | Torr. | Plantaginaceae | 8 |
| Penstemon utahensis | Eastw. | Plantaginaceae | 8 |
| Penstemon venustus | Douglas | Plantaginaceae | 8 |
| Pentachaeta aurea | Nutt. | Asteraceae | 8 |
| Pentachaeta lyonii | A.Gray | Asteraceae | 8 |
| Pentagramma glanduloviscida | Schuettp. & Windham | Pteridaceae | 8 |
| Pentagramma triangularis | (Kaulf.) Yatsk., Windham & E.Wollenw. | Pteridaceae | 8 |
| Pentagramma viscosa | Schuettp. & Windham | Pteridaceae | 8 |
| Peraphyllum ramosissimum | Nutt. | Rosaceae | 8 |
| Pericome caudata | A.Gray | Asteraceae | 8 |
| Perideridia bolanderi | A.Nelson & J.F.Macbr. | Apiaceae | 8 |
| Perideridia californica | (Torr.) A.Nelson & J.F.Macbr. | Apiaceae | 8 |
| Perideridia gairdneri | (Hook. & Arn.) Mathias | Apiaceae | 8 |
| Perideridia kelloggii | (A.Gray) Mathias | Apiaceae | 8 |
| Perideridia pringlei | (J.M.Coult. & Rose) A.Nelson & J.F.Macbr. | Apiaceae | 8 |
| Perityle californica | Benth. | Asteraceae | 8 |
| Perityle emoryi | Torr. | Asteraceae | 8 |
| Perityle inyoensis | (Ferris) A.M.Powell | Asteraceae | 8 |
| Perityle megalocephala | (S.Watson) J.F.Macbr. | Asteraceae | 8 |
| Persicaria amphibia | (L.) Delarbre | Polygonaceae | 8 |
| Persicaria hydropiperoides | (Michx.) Small | Polygonaceae | 8 |
| Persicaria lapathifolia | (L.) Delarbre | Polygonaceae | 8 |
| Persicaria pensylvanica | (L.) M.Gómez | Polygonaceae | 8 |
| Persicaria punctata | Small | Polygonaceae | 8 |
| Petalonyx linearis | Greene | Loasaceae | 8 |
| Petalonyx nitidus | S.Watson | Loasaceae | 8 |
| Petalonyx thurberi | A.Gray | Loasaceae | 8 |
| Petasites frigidus | (L.) Fr. | Asteraceae | 8 |
| Petradoria pumila | (Nutt.) Greene | Asteraceae | 8 |
| Petrophytum caespitosum | (Nutt.) Rydb. | Rosaceae | 8 |
| Peucephyllum schottii | A.Gray | Asteraceae | 8 |
| Phacelia affinis | A.Gray | Hydrophyllaceae | 8 |
| Phacelia austromontana | J.T.Howell | Hydrophyllaceae | 8 |
| Phacelia barnebyana | J.T.Howell | Hydrophyllaceae | 8 |
| Phacelia bicolor | Torr. ex S.Watson | Hydrophyllaceae | 8 |
| Phacelia bolanderi | A.Gray | Hydrophyllaceae | 8 |
| Phacelia brachyloba | (Benth.) A.Gray | Hydrophyllaceae | 8 |
| Phacelia breweri | A.Gray | Hydrophyllaceae | 8 |
| Phacelia californica | Cham. | Hydrophyllaceae | 8 |
| Phacelia calthifolia | Brand | Hydrophyllaceae | 8 |
| Phacelia campanularia | A.Gray | Hydrophyllaceae | 8 |
| Phacelia cicutaria | Greene | Hydrophyllaceae | 8 |
| Phacelia ciliata | Benth. | Hydrophyllaceae | 8 |
| Phacelia corymbosa | Jeps. | Hydrophyllaceae | 8 |
| Phacelia crenulata | Torr. ex S.Watson | Hydrophyllaceae | 8 |
| Phacelia cryptantha | Greene | Hydrophyllaceae | 8 |
| Phacelia davidsonii | A.Gray | Hydrophyllaceae | 8 |
| Phacelia distans | Benth. | Hydrophyllaceae | 8 |
| Phacelia divaricata | (Benth.) A.Gray | Hydrophyllaceae | 8 |
| Phacelia douglasii | (Benth.) Torr. | Hydrophyllaceae | 8 |
| Phacelia egena | (Brand) Greene ex J.T.Howell | Hydrophyllaceae | 8 |
| Phacelia eisenii | Brandegee | Hydrophyllaceae | 8 |
| Phacelia exilis | (A.Gray) G.J.Lee | Hydrophyllaceae | 8 |
| Phacelia floribunda | Greene | Hydrophyllaceae | 8 |
| Phacelia fremontii | Torr. | Hydrophyllaceae | 8 |
| Phacelia glandulifera | Piper | Hydrophyllaceae | 8 |
| Phacelia grandiflora | (Benth.) A.Gray | Hydrophyllaceae | 8 |
| Phacelia greenei | J.T.Howell | Hydrophyllaceae | 8 |
| Phacelia grisea | A.Gray | Hydrophyllaceae | 8 |
| Phacelia gymnoclada | Torr. ex S.Watson | Hydrophyllaceae | 8 |
| Phacelia hastata | Douglas ex Lehm. | Hydrophyllaceae | 8 |
| Phacelia heterophylla | Pursh | Hydrophyllaceae | 8 |
| Phacelia hubbyi | (J.F.Macbr.) Garrison | Hydrophyllaceae | 8 |
| Phacelia humilis | Torr. & A.Gray | Hydrophyllaceae | 8 |
| Phacelia hydrophylloides | Torr. ex A.Gray | Hydrophyllaceae | 8 |
| Phacelia imbricata | Greene | Hydrophyllaceae | 8 |
| Phacelia inundata | J.T.Howell | Hydrophyllaceae | 8 |
| Phacelia inyoensis | (J.F.Macbr.) J.T.Howell | Hydrophyllaceae | 8 |
| Phacelia ivesiana | Torr. | Hydrophyllaceae | 8 |
| Phacelia ixodes | Kellogg | Hydrophyllaceae | 8 |
| Phacelia linearis | (Pursh) Holz. | Hydrophyllaceae | 8 |
| Phacelia longipes | Torr. ex A.Gray | Hydrophyllaceae | 8 |
| Phacelia lyonii | A.Gray | Hydrophyllaceae | 8 |
| Phacelia malvifolia | Cham. & Schltdl. | Hydrophyllaceae | 8 |
| Phacelia marcescens | Eastw. ex J.F.Macbr. | Hydrophyllaceae | 8 |
| Phacelia minor | (Harv.) Thell. | Hydrophyllaceae | 8 |
| Phacelia monoensis | Halse | Hydrophyllaceae | 8 |
| Phacelia nashiana | Jeps. | Hydrophyllaceae | 8 |
| Phacelia neglecta | M.E.Jones | Hydrophyllaceae | 8 |
| Phacelia nemoralis | Greene | Hydrophyllaceae | 8 |
| Phacelia novenmillensis | Munz | Hydrophyllaceae | 8 |
| Phacelia pachyphylla | A.Gray | Hydrophyllaceae | 8 |
| Phacelia parryi | Torr. | Hydrophyllaceae | 8 |
| Phacelia pedicellata | A.Gray | Hydrophyllaceae | 8 |
| Phacelia peirsoniana | J.T.Howell | Hydrophyllaceae | 8 |
| Phacelia perityloides | Coville | Hydrophyllaceae | 8 |
| Phacelia phacelioides | (Benth.) Brand | Hydrophyllaceae | 8 |
| Phacelia pringlei | A.Gray | Hydrophyllaceae | 8 |
| Phacelia procera | A.Gray | Hydrophyllaceae | 8 |
| Phacelia pulchella | A.Gray | Hydrophyllaceae | 8 |
| Phacelia purpusii | Brandegee | Hydrophyllaceae | 8 |
| Phacelia quickii | J.T.Howell | Hydrophyllaceae | 8 |
| Phacelia ramosissima | Douglas ex Lehm. | Hydrophyllaceae | 8 |
| Phacelia rattanii | A.Gray | Hydrophyllaceae | 8 |
| Phacelia rotundifolia | Torr. ex S.Watson | Hydrophyllaceae | 8 |
| Phacelia saxicola | A.Gray | Hydrophyllaceae | 8 |
| Phacelia sericea | (Graham) A.Gray | Hydrophyllaceae | 8 |
| Phacelia stebbinsii | Constance & Heckard | Hydrophyllaceae | 8 |
| Phacelia stellaris | Brand | Hydrophyllaceae | 8 |
| Phacelia suaveolens | Greene | Hydrophyllaceae | 8 |
| Phacelia tanacetifolia | Benth. | Hydrophyllaceae | 8 |
| Phacelia vallicola | Congdon ex Brand | Hydrophyllaceae | 8 |
| Phacelia vallis-mortae | J.W.Voss | Hydrophyllaceae | 8 |
| Phacelia viscida | (Benth. ex Lindl.) Torr. | Hydrophyllaceae | 8 |
| Phalaris arundinacea | L. | Poaceae | 8 |
| Phalaris caroliniana | Walter | Poaceae | 8 |
| Phaseolus filiformis | Benth. | Fabaceae | 8 |
| Philadelphus lewisii | Pursh | Hydrangeaceae | 8 |
| Philadelphus microphyllus | A.Gray | Hydrangeaceae | 8 |
| Phleum alpinum | L. | Poaceae | 8 |
| Phlox adsurgens | Torr. ex A.Gray | Polemoniaceae | 8 |
| Phlox austromontana | Coville | Polemoniaceae | 8 |
| Phlox condensata | (A.Gray) E.E.Nelson | Polemoniaceae | 8 |
| Phlox diffusa | Benth. | Polemoniaceae | 8 |
| Phlox dolichantha | A.Gray | Polemoniaceae | 8 |
| Phlox douglasii | Hook. | Polemoniaceae | 8 |
| Phlox hoodii | Richardson | Polemoniaceae | 8 |
| Phlox longifolia | Nutt. | Polemoniaceae | 8 |
| Phlox pulvinata | (Wherry) Cronquist | Polemoniaceae | 8 |
| Phlox speciosa | Pursh | Polemoniaceae | 8 |
| Phoenicaulis cheiranthoides | Nutt. | Brassicaceae | 8 |
| Pholisma arenarium | Nutt. | Lennoaceae | 8 |
| Pholisma sonorae | (Torr.) Yatsk. | Lennoaceae | 8 |
| Pholistoma auritum | (Lindl.) Lilja | Hydrophyllaceae | 8 |
| Pholistoma membranaceum | (Benth.) Constance | Hydrophyllaceae | 8 |
| Pholistoma racemosum | (Nutt. ex A.Gray) Constance | Hydrophyllaceae | 8 |
| Phoradendron californicum | Nutt. | Santalaceae | 8 |
| Phoradendron densum | Torr. ex Trel. | Santalaceae | 8 |
| Phoradendron juniperinum | Engelm. ex A.Gray | Santalaceae | 8 |
| Phoradendron macrophyllum | (Engelm.) Cockerell | Santalaceae | 8 |
| Phoradendron pauciflorum | Torr. | Santalaceae | 8 |
| Phoradendron villosum | (Nutt.) Nutt. ex Engelm. | Santalaceae | 8 |
| Photinia arbutifolia | Lindl. | Rosaceae | 8 |
| Phragmites australis | (Cav.) Steud. | Poaceae | 8 |
| Phyla cuneifolia | (Torr.) Greene | Verbenaceae | 8 |
| Phyla lanceolata | (Michx.) Greene | Verbenaceae | 8 |
| Phyla nodiflora | (L.) Greene | Verbenaceae | 8 |
| Phyllodoce breweri | (A.Gray) A.Heller | Ericaceae | 8 |
| Phyllodoce empetriformis | (Sm.) D.Don | Ericaceae | 8 |
| Phyllospadix scouleri | Hook. | Zosteraceae | 8 |
| Phyllospadix torreyi | S.Watson | Zosteraceae | 8 |
| Physalis acutifolia | (Miers) Sandwith | Solanaceae | 8 |
| Physalis angulata | L. | Solanaceae | 8 |
| Physalis crassifolia | Benth. | Solanaceae | 8 |
| Physalis fendleri | A.Gray | Solanaceae | 8 |
| Physalis hederifolia | A.Gray | Solanaceae | 8 |
| Physalis longifolia | Nutt. | Solanaceae | 8 |
| Physalis pubescens | L. | Solanaceae | 8 |
| Physaria chambersii | Rollins | Brassicaceae | 8 |
| Physaria kingii | (S.Watson) O'Kane & Al-Shehbaz | Brassicaceae | 8 |
| Physaria ludoviciana | (Nutt.) O'Kane & Al-Shehbaz | Brassicaceae | 8 |
| Physocarpus alternans | (M.E.Jones) J.T.Howell | Rosaceae | 8 |
| Physocarpus capitatus | (Pursh) Kuntze | Rosaceae | 8 |
| Phytolacca americana | L. | Phytolaccaceae | 8 |
| Picea breweriana | S.Watson | Pinaceae | 8 |
| Picea engelmannii | Parry ex Engelm. | Pinaceae | 8 |
| Picea sitchensis | (Bong.) Carrière | Pinaceae | 8 |
| Pickeringia montana | Nutt. | Fabaceae | 8 |
| Picradeniopsis multiflora | (Hook. & Arn.) B.G.Baldwin | Asteraceae | 8 |
| Picrothamnus desertorum | Nutt. | Asteraceae | 8 |
| Pilostyles thurberi | A.Gray | Apodanthaceae | 8 |
| Pilularia americana | A.Br. | Marsileaceae | 8 |
| Pinguicula macroceras | Pall. ex Link | Lentibulariaceae | 8 |
| Pinus albicaulis | Engelm. | Pinaceae | 8 |
| Pinus attenuata | Lemmon | Pinaceae | 8 |
| Pinus balfouriana | A.Murray bis & al. | Pinaceae | 8 |
| Pinus contorta | Douglas ex Loudon | Pinaceae | 8 |
| Pinus coulteri | D.Don | Pinaceae | 8 |
| Pinus edulis | Engelm. | Pinaceae | 8 |
| Pinus flexilis | E.James | Pinaceae | 8 |
| Pinus jeffreyi | A.Murray bis & al. | Pinaceae | 8 |
| Pinus lambertiana | Douglas | Pinaceae | 8 |
| Pinus longaeva | D.K.Bailey | Pinaceae | 8 |
| Pinus monophylla | Torr. & Frém. | Pinaceae | 8 |
| Pinus monticola | Douglas ex D.Don | Pinaceae | 8 |
| Pinus muricata | D.Don | Pinaceae | 8 |
| Pinus ponderosa | Douglas ex C.Lawson | Pinaceae | 8 |
| Pinus quadrifolia | Parl. ex Sudw. | Pinaceae | 8 |
| Pinus radiata | D.Don | Pinaceae | 8 |
| Pinus sabiniana | Douglas | Pinaceae | 8 |
| Pinus torreyana | Parry ex Carrière | Pinaceae | 8 |
| Piptatheropsis exigua | (Thurb.) Romasch., P.M.Peterson & Soreng | Poaceae | 8 |
| Piptatheropsis micrantha | (Trin. & Rupr.) Romasch., P.M.Peterson & Soreng | Poaceae | 8 |
| Pityopus californicus | (Eastw.) H.F.Copel. | Ericaceae | 8 |
| Plagiobothrys acanthocarpus | (Piper) I.M.Johnst. | Boraginaceae | 8 |
| Plagiobothrys arizonicus | (A.Gray) Greene ex A.Gray | Boraginaceae | 8 |
| Plagiobothrys austiniae | (Greene) I.M.Johnst. | Boraginaceae | 8 |
| Plagiobothrys bracteatus | (Howell) I.M.Johnst. | Boraginaceae | 8 |
| Plagiobothrys canescens | Benth. | Boraginaceae | 8 |
| Plagiobothrys collinus | (Phil.) I.M.Johnst. | Boraginaceae | 8 |
| Plagiobothrys fulvus | (Hook. & Arn.) I.M.Johnst. | Boraginaceae | 8 |
| Plagiobothrys greenei | (A.Gray) I.M.Johnst. | Boraginaceae | 8 |
| Plagiobothrys nothofulvus | (A.Gray) A.Gray | Boraginaceae | 8 |
| Plagiobothrys parishii | I.M.Johnst. | Boraginaceae | 8 |
| Plagiobothrys salsus | (Brandegee) I.M.Johnst. | Boraginaceae | 8 |
| Plagiobothrys scouleri | (Hook. & Arn.) I.M.Johnst. | Boraginaceae | 8 |
| Plagiobothrys stipitatus | I.M.Johnst. | Boraginaceae | 8 |
| Plagiobothrys tenellus | (Nutt.) A.Gray | Boraginaceae | 8 |
| Planodes virginicum | (L.) Greene | Brassicaceae | 8 |
| Plantago aristata | Michx. | Plantaginaceae | 8 |
| Plantago elongata | Pursh | Plantaginaceae | 8 |
| Plantago erecta | E.Morris | Plantaginaceae | 8 |
| Plantago maritima | L. | Plantaginaceae | 8 |
| Plantago ovata | Forssk. | Plantaginaceae | 8 |
| Plantago patagonica | Jacq. | Plantaginaceae | 8 |
| Plantago rhodosperma | Decne. | Plantaginaceae | 8 |
| Plantago subnuda | Pilg. | Plantaginaceae | 8 |
| Plantago virginica | L. | Plantaginaceae | 8 |
| Platanthera colemanii | (Rand.Morgan & Glic.) R.M.Bateman | Orchidaceae | 8 |
| Platanthera cooperi | (S.Watson) R.M.Bateman | Orchidaceae | 8 |
| Platanthera dilatata | (Pursh) Lindl. ex L.C.Beck | Orchidaceae | 8 |
| Platanthera elegans | Lindl. | Orchidaceae | 8 |
| Platanthera elongata | (Rydb.) R.M.Bateman | Orchidaceae | 8 |
| Platanthera ephemerantha | R.M.Bateman | Orchidaceae | 8 |
| Platanthera leptopetala | (Rydb.) R.M.Bateman | Orchidaceae | 8 |
| Platanthera michaelii | (Greene) R.M.Bateman | Orchidaceae | 8 |
| Platanthera purpurascens | (Rydb.) Sheviak & W.F.Jenn. | Orchidaceae | 8 |
| Platanthera sparsiflora | (S.Watson) Schltr. | Orchidaceae | 8 |
| Platanthera stricta | Lindl. | Orchidaceae | 8 |
| Platanthera transversa | (Suksd.) R.M.Bateman | Orchidaceae | 8 |
| Platanthera unalascensis | (Spreng.) Kurtz | Orchidaceae | 8 |
| Platanthera yadonii | (Rand.Morgan & Ackerman) R.M.Bateman | Orchidaceae | 8 |
| Platanthera yosemitensis | Colwell, Sheviak & P.E.Moore | Orchidaceae | 8 |
| Platanus racemosa | Nutt. | Platanaceae | 8 |
| Platystemon californicus | Benth. | Papaveraceae | 8 |
| Platystigma lineare | Benth. | Papaveraceae | 8 |
| Pleiacanthus spinosus | (Nutt.) Rydb. | Asteraceae | 8 |
| Pleuricospora fimbriolata | A.Gray | Ericaceae | 8 |
| Pleurocoronis pluriseta | (A.Gray) R.M.King & H.Rob. | Asteraceae | 8 |
| Pleuropogon californicus | (Nees) Benth. ex Vasey | Poaceae | 8 |
| Pleuropogon refractus | (A.Gray) Benth. ex Vasey | Poaceae | 8 |
| Pluchea odorata | (L.) Cass. | Asteraceae | 8 |
| Pluchea sericea | (Nutt.) Coville | Asteraceae | 8 |
| Poa bigelovii | Vasey ex Scribn. | Poaceae | 8 |
| Poa cusickii | Vasey | Poaceae | 8 |
| Poa douglasii | Nees | Poaceae | 8 |
| Poa fendleriana | (Steud.) Vasey | Poaceae | 8 |
| Poa glauca | Vahl | Poaceae | 8 |
| Poa macrantha | Vasey | Poaceae | 8 |
| Poa nemoralis | L. | Poaceae | 8 |
| Poa palustris | L. | Poaceae | 8 |
| Poa pratensis | L. | Poaceae | 8 |
| Poa secunda | J.Presl | Poaceae | 8 |
| Poa unilateralis | Scribn. ex Vasey | Poaceae | 8 |
| Poa wheeleri | Vasey | Poaceae | 8 |
| Podistera nevadensis | (A.Gray) S.Watson | Apiaceae | 8 |
| Pogogyne abramsii | J.T.Howell | Lamiaceae | 8 |
| Pogogyne douglasii | Benth. | Lamiaceae | 8 |
| Pogogyne nudiuscula | A.Gray | Lamiaceae | 8 |
| Pogogyne serpylloides | (Torr.) A.Gray | Lamiaceae | 8 |
| Pogogyne zizyphoroides | Benth. | Lamiaceae | 8 |
| Polemonium californicum | Eastw. | Polemoniaceae | 8 |
| Polemonium carneum | A.Gray | Polemoniaceae | 8 |
| Polemonium chartaceum | H.Mason | Polemoniaceae | 8 |
| Polemonium eddyense | Stubbs | Polemoniaceae | 8 |
| Polemonium elegans | Greene | Polemoniaceae | 8 |
| Polemonium eximium | Greene | Polemoniaceae | 8 |
| Polemonium micranthum | Benth. | Polemoniaceae | 8 |
| Polemonium occidentale | Greene | Polemoniaceae | 8 |
| Polemonium pulcherrimum | Hook. | Polemoniaceae | 8 |
| Polycarpon tetraphyllum | (L.) L. | Caryophyllaceae | 8 |
| Polyctenium fremontii | Greene | Brassicaceae | 8 |
| Polygonum aviculare | L. | Polygonaceae | 8 |
| Polygonum minimum | S.Watson | Polygonaceae | 8 |
| Polygonum paronychia | Cham. & Schltdl. | Polygonaceae | 8 |
| Polygonum shastense | Brewer | Polygonaceae | 8 |
| Polygonum spergulariiforme | Meisn. ex Small | Polygonaceae | 8 |
| Polypodium californicum | Kaulf. | Polypodiaceae | 8 |
| Polypodium glycyrrhiza | D.C.Eaton | Polypodiaceae | 8 |
| Polypodium hesperium | Maxon | Polypodiaceae | 8 |
| Polypodium scouleri | Hook. & Grev. | Polypodiaceae | 8 |
| Polypogon interruptus | Kunth | Poaceae | 8 |
| Polystichum californicum | (D.C.Eaton) Diels | Dryopteridaceae | 8 |
| Polystichum dudleyi | Maxon | Dryopteridaceae | 8 |
| Polystichum imbricans | (D.C.Eaton) D.H.Wagner | Dryopteridaceae | 8 |
| Polystichum kruckebergii | W.H.Wagner | Dryopteridaceae | 8 |
| Polystichum lemmonii | Underw. | Dryopteridaceae | 8 |
| Polystichum lonchitis | (L.) Roth | Dryopteridaceae | 8 |
| Polystichum munitum | (Kaulf.) C.Presl | Dryopteridaceae | 8 |
| Polystichum scopulinum | (D.C.Eaton) Maxon | Dryopteridaceae | 8 |
| Populus fremontii | S.Watson | Salicaceae | 8 |
| Populus tremuloides | Michx. | Salicaceae | 8 |
| Porophyllum gracile | Benth. | Asteraceae | 8 |
| Porterella carnosula | (Hook. & Arn.) Torr. | Campanulaceae | 8 |
| Portulaca halimoides | L. | Portulacaceae | 8 |
| Potamogeton alpinus | Balb. | Potamogetonaceae | 8 |
| Potamogeton amplifolius | Tuck. | Potamogetonaceae | 8 |
| Potamogeton berchtoldii | Fieber | Potamogetonaceae | 8 |
| Potamogeton diversifolius | Raf. | Potamogetonaceae | 8 |
| Potamogeton epihydrus | Raf. | Potamogetonaceae | 8 |
| Potamogeton foliosus | Raf. | Potamogetonaceae | 8 |
| Potamogeton gramineus | L. | Potamogetonaceae | 8 |
| Potamogeton illinoensis | Morong | Potamogetonaceae | 8 |
| Potamogeton natans | L. | Potamogetonaceae | 8 |
| Potamogeton nodosus | Poir. | Potamogetonaceae | 8 |
| Potamogeton praelongus | Wulfen | Potamogetonaceae | 8 |
| Potamogeton pusillus | L. | Potamogetonaceae | 8 |
| Potamogeton richardsonii | Rydb. | Potamogetonaceae | 8 |
| Potamogeton robbinsii | Oakes | Potamogetonaceae | 8 |
| Potamogeton zosteriformis | Fernald | Potamogetonaceae | 8 |
| Potentilla argyrocoma | (Rydb.) Jeps. | Rosaceae | 8 |
| Potentilla biennis | Greene | Rosaceae | 8 |
| Potentilla bolanderi | (A.Gray) Greene | Rosaceae | 8 |
| Potentilla breweri | S.Watson | Rosaceae | 8 |
| Potentilla californica | (Cham. & Schltdl.) Greene | Rosaceae | 8 |
| Potentilla campestris | (M.E.Jones) Jeps. | Rosaceae | 8 |
| Potentilla clevelandii | Greene | Rosaceae | 8 |
| Potentilla concinna | Richardson | Rosaceae | 8 |
| Potentilla congdonis | (Rydb.) Mosyakin & Shiyan | Rosaceae | 8 |
| Potentilla daucifolia | Greene | Rosaceae | 8 |
| Potentilla douglasii | Greene | Rosaceae | 8 |
| Potentilla drummondii | Lehm. | Rosaceae | 8 |
| Potentilla flabellifolia | Hook. ex Torr. & A.Gray | Rosaceae | 8 |
| Potentilla glaucophylla | Lehm. | Rosaceae | 8 |
| Potentilla gordonii | (Hook.) Greene | Rosaceae | 8 |
| Potentilla gracilis | Douglas ex Hook. | Rosaceae | 8 |
| Potentilla hispidula | (Rydb.) Jeps. | Rosaceae | 8 |
| Potentilla jaegeri | (Munz & I.M.Johnst.) L.C.Wheeler | Rosaceae | 8 |
| Potentilla lindleyi | Greene | Rosaceae | 8 |
| Potentilla lycopodioides | (A.Gray) Baill. ex J.T.Howell | Rosaceae | 8 |
| Potentilla marinensis | (Elmer) J.T.Howell | Rosaceae | 8 |
| Potentilla micheneri | Greene | Rosaceae | 8 |
| Potentilla millefolia | Rydb. | Rosaceae | 8 |
| Potentilla morefieldii | Ertter | Rosaceae | 8 |
| Potentilla muirii | (A.Gray) Greene | Rosaceae | 8 |
| Potentilla newberryi | A.Gray | Rosaceae | 8 |
| Potentilla norvegica | L. | Rosaceae | 8 |
| Potentilla nubigena | Greene | Rosaceae | 8 |
| Potentilla parryi | (Greene) Greene | Rosaceae | 8 |
| Potentilla pensylvanica | L. | Rosaceae | 8 |
| Potentilla pseudosericea | Rydb. | Rosaceae | 8 |
| Potentilla pulcherrima | Lehm. | Rosaceae | 8 |
| Potentilla purpurascens | (S.Watson) Greene | Rosaceae | 8 |
| Potentilla rivalis | Nutt. | Rosaceae | 8 |
| Potentilla rydbergii | (Elmer) Mosyakin & Shiyan | Rosaceae | 8 |
| Potentilla santolinoides | (A.Gray) Greene | Rosaceae | 8 |
| Potentilla saxosa | Lemmon & S.A.Lemmon ex Greene | Rosaceae | 8 |
| Potentilla sericoleuca | (Rydb.) J.T.Howell | Rosaceae | 8 |
| Potentilla tilingii | (Regel) Greene | Rosaceae | 8 |
| Potentilla truncata | (Rydb.) Jeps. | Rosaceae | 8 |
| Potentilla webberi | (A.Gray) Greene | Rosaceae | 8 |
| Potentilla yadonii | (Ertter) Mosyakin & Shiyan | Rosaceae | 8 |
| Prenanthella exigua | (A.Gray) Rydb. | Asteraceae | 8 |
| Primula clevelandii | (Greene) A.R.Mast & Reveal | Primulaceae | 8 |
| Primula conjugens | (Greene) A.R.Mast & Reveal | Primulaceae | 8 |
| Primula fragrans | A.R.Mast & Reveal | Primulaceae | 8 |
| Primula hendersonii | (A.Gray) A.R.Mast & Reveal | Primulaceae | 8 |
| Primula jeffreyi | (Van Houtte) A.R.Mast & Reveal | Primulaceae | 8 |
| Primula pauciflora | (Greene) A.R.Mast & Reveal | Primulaceae | 8 |
| Primula suffrutescens | A.Gray | Primulaceae | 8 |
| Primula tetrandra | (Suksd.) A.R.Mast & Reveal | Primulaceae | 8 |
| Proboscidea althaeifolia | (Benth.) Decne. | Martyniaceae | 8 |
| Proboscidea louisianica | (Mill.) Thell. | Martyniaceae | 8 |
| Proboscidea parviflora | (Wooton) Wooton & Standl. | Martyniaceae | 8 |
| Prosartes hookeri | Torr. | Liliaceae | 8 |
| Prosartes parvifolia | S.Watson | Liliaceae | 8 |
| Prunella vulgaris | L. | Lamiaceae | 8 |
| Prunus andersonii | A.Gray | Rosaceae | 8 |
| Prunus emarginata | (Douglas ex Hook.) Eaton | Rosaceae | 8 |
| Prunus fasciculata | (Torr.) A.Gray | Rosaceae | 8 |
| Prunus fremontii | S.Watson | Rosaceae | 8 |
| Prunus ilicifolia | (Nutt. ex Hook. & Arn.) D.Dietr. | Rosaceae | 8 |
| Prunus rivularis | Scheele | Rosaceae | 8 |
| Prunus subcordata | Benth. | Rosaceae | 8 |
| Prunus virginiana | L. | Rosaceae | 8 |
| Psathyrotes annua | (Nutt.) A.Gray | Asteraceae | 8 |
| Psathyrotes ramosissima | A.Gray | Asteraceae | 8 |
| Pseudobahia heermannii | Rydb. | Asteraceae | 8 |
| Pseudobahia peirsonii | Munz | Asteraceae | 8 |
| Pseudognaphalium biolettii | Anderb. | Asteraceae | 8 |
| Pseudognaphalium californicum | (DC.) Anderb. | Asteraceae | 8 |
| Pseudognaphalium canescens | (DC.) Anderb. | Asteraceae | 8 |
| Pseudognaphalium leucocephalum | (A.Gray) Anderb. | Asteraceae | 8 |
| Pseudognaphalium macounii | (Greene) Kartesz | Asteraceae | 8 |
| Pseudognaphalium ramosissimum | (Nutt.) Anderb. | Asteraceae | 8 |
| Pseudognaphalium stramineum | (Kunth) Anderb. | Asteraceae | 8 |
| Pseudognaphalium thermale | (E.E.Nelson) G.L.Nesom | Asteraceae | 8 |
| Pseudoroegneria spicata | (Pursh) Á.Löve | Poaceae | 8 |
| Pseudorontium cyathiferum | (Benth.) Rothm. | Plantaginaceae | 8 |
| Pseudotrillium rivale | (S.Watson) S.B.Farmer | Melanthiaceae | 8 |
| Pseudotsuga macrocarpa | (Vasey) Mayr | Pinaceae | 8 |
| Pseudotsuga menziesii | (Mirb.) Franco | Pinaceae | 8 |
| Pseudoziziphus parryi | (Torr.) Hauenschild | Rhamnaceae | 8 |
| Psilocarphus brevissimus | Nutt. | Asteraceae | 8 |
| Psilocarphus elatior | A.Gray | Asteraceae | 8 |
| Psilocarphus tenellus | Nutt. | Asteraceae | 8 |
| Psilostrophe cooperi | (A.Gray) Greene | Asteraceae | 8 |
| Psorodendron arborescens | (Torr. ex A.Gray) Rydb. | Fabaceae | 8 |
| Psorodendron fremontii | (Torr. ex A.Gray) Rydb. | Fabaceae | 8 |
| Psorodendron schottii | (Torr.) Rydb. | Fabaceae | 8 |
| Psorodendron spinosum | (A.Gray) Rydb. | Fabaceae | 8 |
| Psorothamnus emoryi | (A.Gray) Rydb. | Fabaceae | 8 |
| Psorothamnus polydenius | (Torr.) Rydb. | Fabaceae | 8 |
| Ptelea crenulata | Greene | Rutaceae | 8 |
| Pteridium aquilinum | (L.) Kuhn | Dennstaedtiaceae | 8 |
| Pterospora andromedea | Nutt. | Ericaceae | 8 |
| Pterostegia drymarioides | Fisch. & C.A.Mey. | Polygonaceae | 8 |
| Puccinellia howellii | J.I.Davis | Poaceae | 8 |
| Puccinellia lemmonii | (Vasey) Scribn. | Poaceae | 8 |
| Puccinellia nuttalliana | (Schult.) Hitchc. | Poaceae | 8 |
| Pulsatilla occidentalis | (S.Watson) Freyn | Ranunculaceae | 8 |
| Purshia glandulosa | Curran | Rosaceae | 8 |
| Purshia stansburyana | (Torr.) Henrickson | Rosaceae | 8 |
| Purshia tridentata | (Pursh) DC. | Rosaceae | 8 |
| Pyrola aphylla | Sm. | Ericaceae | 8 |
| Pyrola asarifolia | Michx. | Ericaceae | 8 |
| Pyrola chlorantha | Sw. | Ericaceae | 8 |
| Pyrola minor | L. | Ericaceae | 8 |
| Pyrola picta | Sm. | Ericaceae | 8 |
| Pyrrocoma apargioides | (A.Gray) Greene | Asteraceae | 8 |
| Pyrrocoma carthamoides | Hook. | Asteraceae | 8 |
| Quercus agrifolia | Née | Fagaceae | 8 |
| Quercus berberidifolia | Liebm. | Fagaceae | 8 |
| Quercus chrysolepis | Liebm. | Fagaceae | 8 |
| Quercus cornelius-mulleri | Nixon & K.P.Steele | Fagaceae | 8 |
| Quercus douglasii | Hook. & Arn. | Fagaceae | 8 |
| Quercus dumosa | Nutt. | Fagaceae | 8 |
| Quercus durata | Jeps. | Fagaceae | 8 |
| Quercus engelmannii | Greene | Fagaceae | 8 |
| Quercus garryana | Douglas ex Hook. | Fagaceae | 8 |
| Quercus john-tuckeri | Nixon & C.H.Mull. | Fagaceae | 8 |
| Quercus kelloggii | Newb. | Fagaceae | 8 |
| Quercus lobata | Née | Fagaceae | 8 |
| Quercus pacifica | Nixon & C.H.Mull. | Fagaceae | 8 |
| Quercus palmeri | (Engelm.) Engelm. | Fagaceae | 8 |
| Quercus parvula | Greene | Fagaceae | 8 |
| Quercus sadleriana | R.Br.ter | Fagaceae | 8 |
| Quercus tomentella | Engelm. | Fagaceae | 8 |
| Quercus turbinella | Greene | Fagaceae | 8 |
| Quercus wislizeni | A.DC. | Fagaceae | 8 |
| Quincula lobata | (Torr.) Raf. | Solanaceae | 8 |
| Rafinesquia californica | Nutt. | Asteraceae | 8 |
| Rafinesquia neomexicana | A.Gray | Asteraceae | 8 |
| Raillardella argentea | A.Gray | Asteraceae | 8 |
| Raillardella pringlei | Greene | Asteraceae | 8 |
| Raillardella scaposa | A.Gray | Asteraceae | 8 |
| Ranunculus alismifolius | Geyer ex Benth. | Ranunculaceae | 8 |
| Ranunculus andersonii | A.Gray | Ranunculaceae | 8 |
| Ranunculus californicus | Benth. | Ranunculaceae | 8 |
| Ranunculus canus | Benth. | Ranunculaceae | 8 |
| Ranunculus eschscholtzii | Schltdl. | Ranunculaceae | 8 |
| Ranunculus flabellaris | Raf. | Ranunculaceae | 8 |
| Ranunculus flammula | L. | Ranunculaceae | 8 |
| Ranunculus glaberrimus | Hook. | Ranunculaceae | 8 |
| Ranunculus hebecarpus | Hook. & Arn. | Ranunculaceae | 8 |
| Ranunculus hystriculus | A.Gray | Ranunculaceae | 8 |
| Ranunculus lobbii | (Hiern) A.Gray | Ranunculaceae | 8 |
| Ranunculus macounii | Britton | Ranunculaceae | 8 |
| Ranunculus minimus | E.H.L.Krause | Ranunculaceae | 8 |
| Ranunculus occidentalis | Nutt. | Ranunculaceae | 8 |
| Ranunculus orthorhynchus | Hook. | Ranunculaceae | 8 |
| Ranunculus populago | Greene | Ranunculaceae | 8 |
| Ranunculus pusillus | Poir. | Ranunculaceae | 8 |
| Ranunculus sceleratus | L. | Ranunculaceae | 8 |
| Ranunculus trichophyllus | Chaix | Ranunculaceae | 8 |
| Ranunculus uncinatus | D.Don ex G.Don | Ranunculaceae | 8 |
| Rhamnus alnifolia | L'Hér. | Rhamnaceae | 8 |
| Rhamnus crocea | Nutt. | Rhamnaceae | 8 |
| Rhinotropis californica | (Nutt.) J.R.Abbott | Polygalaceae | 8 |
| Rhinotropis cornuta | (Kellogg) J.R.Abbott | Polygalaceae | 8 |
| Rhinotropis intermontana | (T.Wendt) J.R.Abbott | Polygalaceae | 8 |
| Rhinotropis subspinosa | (S.Watson) J.R.Abbott | Polygalaceae | 8 |
| Rhodiola integrifolia | Raf. | Crassulaceae | 8 |
| Rhododendron columbianum | (Piper) Harmaja | Ericaceae | 8 |
| Rhododendron macrophyllum | D.Don ex G.Don | Ericaceae | 8 |
| Rhododendron menziesii | Craven | Ericaceae | 8 |
| Rhododendron occidentale | (Torr. & A.Gray) A.Gray | Ericaceae | 8 |
| Rhus aromatica | Aiton | Anacardiaceae | 8 |
| Rhus glabra | L. | Anacardiaceae | 8 |
| Rhus integrifolia | (Nutt.) Benth. & Hook.f. ex W.H.Brewer & S.Watson | Anacardiaceae | 8 |
| Rhus ovata | S.Watson | Anacardiaceae | 8 |
| Rhynchospora alba | (L.) Vahl | Cyperaceae | 8 |
| Rhynchospora capitellata | (Michx.) Vahl | Cyperaceae | 8 |
| Rhynchospora recognita | (Gale) Kral | Cyperaceae | 8 |
| Ribes amarum | McClatchie | Grossulariaceae | 8 |
| Ribes aureum | Pursh | Grossulariaceae | 8 |
| Ribes bracteosum | Douglas | Grossulariaceae | 8 |
| Ribes californicum | Hook. & Arn. | Grossulariaceae | 8 |
| Ribes canthariforme | Wiggins | Grossulariaceae | 8 |
| Ribes cereum | Douglas | Grossulariaceae | 8 |
| Ribes divaricatum | Douglas | Grossulariaceae | 8 |
| Ribes hudsonianum | Richardson | Grossulariaceae | 8 |
| Ribes indecorum | Eastw. | Grossulariaceae | 8 |
| Ribes inerme | Rydb. | Grossulariaceae | 8 |
| Ribes lacustre | (Pers.) Poir. | Grossulariaceae | 8 |
| Ribes laxiflorum | Pursh | Grossulariaceae | 8 |
| Ribes lobbii | A.Gray | Grossulariaceae | 8 |
| Ribes malvaceum | Sm. | Grossulariaceae | 8 |
| Ribes menziesii | Pursh | Grossulariaceae | 8 |
| Ribes montigenum | McClatchie | Grossulariaceae | 8 |
| Ribes nevadense | Kellogg | Grossulariaceae | 8 |
| Ribes quercetorum | Greene | Grossulariaceae | 8 |
| Ribes roezlii | Regel | Grossulariaceae | 8 |
| Ribes sanguineum | Pursh | Grossulariaceae | 8 |
| Ribes sericeum | Eastw. | Grossulariaceae | 8 |
| Ribes speciosum | Pursh | Grossulariaceae | 8 |
| Ribes velutinum | Greene | Grossulariaceae | 8 |
| Ribes viburnifolium | A.Gray | Grossulariaceae | 8 |
| Ribes viscosissimum | Pursh | Grossulariaceae | 8 |
| Rigiopappus leptocladus | A.Gray | Asteraceae | 8 |
| Robinia neomexicana | A.Gray | Fabaceae | 8 |
| Romanzoffia californica | Greene | Hydrophyllaceae | 8 |
| Romanzoffia sitchensis | Bong. | Hydrophyllaceae | 8 |
| Romanzoffia tracyi | Jeps. | Hydrophyllaceae | 8 |
| Romneya coulteri | Harv. | Papaveraceae | 8 |
| Romneya trichocalyx | Eastw. | Papaveraceae | 8 |
| Rorippa curvipes | Greene | Brassicaceae | 8 |
| Rorippa curvisiliqua | (Hook.) Bessey ex Britton | Brassicaceae | 8 |
| Rorippa palustris | (L.) Besser | Brassicaceae | 8 |
| Rorippa subumbellata | Rollins | Brassicaceae | 8 |
| Rosa bridgesii | Crép. ex Rydb. | Rosaceae | 8 |
| Rosa californica | Cham. & Schltdl. | Rosaceae | 8 |
| Rosa gymnocarpa | Nutt. | Rosaceae | 8 |
| Rosa minutifolia | Engelm. | Rosaceae | 8 |
| Rosa nutkana | C.Presl | Rosaceae | 8 |
| Rosa pisocarpa | A.Gray | Rosaceae | 8 |
| Rosa spithamea | S.Watson | Rosaceae | 8 |
| Rosa woodsii | Lindl. | Rosaceae | 8 |
| Rotala ramosior | (L.) Koehne | Lythraceae | 8 |
| Rubus idaeus | L. | Rosaceae | 8 |
| Rubus lasiococcus | A.Gray | Rosaceae | 8 |
| Rubus leucodermis | (Douglas ex Hook.) Douglas ex Torr. & A.Gray | Rosaceae | 8 |
| Rubus nivalis | Douglas ex Hook. | Rosaceae | 8 |
| Rubus parviflorus | Nutt. | Rosaceae | 8 |
| Rubus spectabilis | Pursh | Rosaceae | 8 |
| Rubus ursinus | Cham. & Schltdl. | Rosaceae | 8 |
| Rudbeckia californica | A.Gray | Asteraceae | 8 |
| Rudbeckia glaucescens | Eastw. | Asteraceae | 8 |
| Rudbeckia hirta | L. | Asteraceae | 8 |
| Rudbeckia klamathensis | P.B.Cox & Urbatsch | Asteraceae | 8 |
| Rudbeckia occidentalis | Nutt. | Asteraceae | 8 |
| Rumex californicus | Rech.f. | Polygonaceae | 8 |
| Rumex crassus | Rech.f. | Polygonaceae | 8 |
| Rumex hymenosepalus | Torr. | Polygonaceae | 8 |
| Rumex maritimus | L. | Polygonaceae | 8 |
| Rumex occidentalis | S.Watson | Polygonaceae | 8 |
| Rumex paucifolius | Nutt. | Polygonaceae | 8 |
| Rumex salicifolius | Weinm. | Polygonaceae | 8 |
| Rumex transitorius | Rech.f. | Polygonaceae | 8 |
| Rumex triangulivalvis | (Danser) Rech.f. | Polygonaceae | 8 |
| Rumex venosus | Pursh | Polygonaceae | 8 |
| Rupertia physodes | (Douglas) J.W.Grimes | Fabaceae | 8 |
| Ruppia cirrhosa | (Petagna) Grande | Ruppiaceae | 8 |
| Ruppia maritima | L. | Ruppiaceae | 8 |
| Sabulina californica | (A.Gray) Dillenb. & Kadereit | Caryophyllaceae | 8 |
| Sabulina douglasii | (Fenzl ex Torr. & A.Gray) Dillenb. & Kadereit | Caryophyllaceae | 8 |
| Sabulina nuttallii | (Pax) Dillenb. & Kadereit | Caryophyllaceae | 8 |
| Sabulina rubella | (Wahlenb.) Dillenb. & Kadereit | Caryophyllaceae | 8 |
| Sabulina stolonifera | (T.W.Nelson & J.P.Nelson) Dillenb. & Kadereit | Caryophyllaceae | 8 |
| Sagina decumbens | (Elliott) Torr. & A.Gray | Caryophyllaceae | 8 |
| Sagina maxima | A.Gray | Caryophyllaceae | 8 |
| Sagina saginoides | (L.) H.Karst. | Caryophyllaceae | 8 |
| Sagittaria cuneata | E.Sheld. | Alismataceae | 8 |
| Sagittaria latifolia | Willd. | Alismataceae | 8 |
| Sagittaria longiloba | Engelm. ex J.G.Sm. | Alismataceae | 8 |
| Sagittaria montevidensis | Cham. & Schltdl. | Alismataceae | 8 |
| Sagittaria rigida | Pursh | Alismataceae | 8 |
| Sagittaria sanfordii | Greene | Alismataceae | 8 |
| Sairocarpus coulterianus | (Benth.) D.A.Sutton | Plantaginaceae | 8 |
| Sairocarpus kingii | (S.Watson) D.A.Sutton | Plantaginaceae | 8 |
| Sairocarpus multiflorus | D.A.Sutton | Plantaginaceae | 8 |
| Sairocarpus nuttallianus | (Benth.) D.A.Sutton | Plantaginaceae | 8 |
| Sairocarpus vexillocalyculatus | (Kellogg) D.A.Sutton | Plantaginaceae | 8 |
| Salicornia bigelovii | Torr. | Chenopodiaceae | 8 |
| Salicornia pacifica | Standl. | Chenopodiaceae | 8 |
| Salix bebbiana | Sarg. | Salicaceae | 8 |
| Salix boothii | Dorn | Salicaceae | 8 |
| Salix breweri | Bebb | Salicaceae | 8 |
| Salix drummondiana | Barratt | Salicaceae | 8 |
| Salix eastwoodiae | Cockerell ex A.Heller | Salicaceae | 8 |
| Salix exigua | Nutt. | Salicaceae | 8 |
| Salix geyeriana | Andersson | Salicaceae | 8 |
| Salix gooddingii | C.R.Ball | Salicaceae | 8 |
| Salix hookeriana | Barratt ex Hook. | Salicaceae | 8 |
| Salix laevigata | Bebb | Salicaceae | 8 |
| Salix lasiandra | Benth. | Salicaceae | 8 |
| Salix lasiolepis | Benth. | Salicaceae | 8 |
| Salix lutea | Nutt. | Salicaceae | 8 |
| Salix melanopsis | Nutt. | Salicaceae | 8 |
| Salix nivalis | Hook. | Salicaceae | 8 |
| Salix petrophila | Rydb. | Salicaceae | 8 |
| Salix planifolia | Pursh | Salicaceae | 8 |
| Salix scouleriana | Barratt | Salicaceae | 8 |
| Salix sitchensis | Sanson ex Bong. | Salicaceae | 8 |
| Saltugilia australis | (H.Mason & A.D.Grant) L.A.Johnson | Polemoniaceae | 8 |
| Saltugilia splendens | (Douglas ex H.Mason & A.D.Grant) L.A.Johnson | Polemoniaceae | 8 |
| Salvia apiana | Jeps. | Lamiaceae | 8 |
| Salvia brandegeei | Munz | Lamiaceae | 8 |
| Salvia carduacea | Benth. | Lamiaceae | 8 |
| Salvia clevelandii | (A.Gray) Greene | Lamiaceae | 8 |
| Salvia columbariae | Benth. | Lamiaceae | 8 |
| Salvia dorrii | (Kellogg) Abrams | Lamiaceae | 8 |
| Salvia eremostachya | Jeps. | Lamiaceae | 8 |
| Salvia funerea | M.E.Jones | Lamiaceae | 8 |
| Salvia leucophylla | Greene | Lamiaceae | 8 |
| Salvia mellifera | Greene | Lamiaceae | 8 |
| Salvia mohavensis | Greene | Lamiaceae | 8 |
| Salvia munzii | Epling | Lamiaceae | 8 |
| Salvia pachyphylla | Epling ex Munz | Lamiaceae | 8 |
| Salvia sonomensis | Greene | Lamiaceae | 8 |
| Salvia spathacea | Greene | Lamiaceae | 8 |
| Salvia vaseyi | (Porter) Parish | Lamiaceae | 8 |
| Sambucus canadensis | L. | Viburnaceae | 8 |
| Sambucus cerulea | Raf. | Viburnaceae | 8 |
| Sambucus racemosa | L. | Viburnaceae | 8 |
| Samolus parviflorus | Raf. | Primulaceae | 8 |
| Sanguisorba occidentalis | Nutt. | Rosaceae | 8 |
| Sanguisorba officinalis | L. | Rosaceae | 8 |
| Sanicula arctopoides | Hook. & Arn. | Apiaceae | 8 |
| Sanicula arguta | Greene ex J.M.Coult. & Rose | Apiaceae | 8 |
| Sanicula bipinnata | Hook. & Arn. | Apiaceae | 8 |
| Sanicula bipinnatifida | Douglas | Apiaceae | 8 |
| Sanicula crassicaulis | Poepp. ex DC. | Apiaceae | 8 |
| Sanicula graveolens | Poepp. ex DC. | Apiaceae | 8 |
| Sanicula hoffmannii | (Munz) R.H.Shan & Constance | Apiaceae | 8 |
| Sanicula laciniata | Hook. & Arn. | Apiaceae | 8 |
| Sanicula maritima | Kellogg ex S.Watson | Apiaceae | 8 |
| Sanicula peckiana | J.F.Macbr. | Apiaceae | 8 |
| Sanicula tuberosa | Torr. | Apiaceae | 8 |
| Sarcobatus vermiculatus | (Hook.) Torr. | Sarcobataceae | 8 |
| Sarcodes sanguinea | Torr. | Ericaceae | 8 |
| Saussurea americana | Eaton | Asteraceae | 8 |
| Saxifraga cespitosa | L. | Saxifragaceae | 8 |
| Saxifraga hyperborea | R.Br. | Saxifragaceae | 8 |
| Sceptridium multifidum | (S.G.Gmel.) M.Nishida | Ophioglossaceae | 8 |
| Scheuchzeria palustris | L. | Scheuchzeriaceae | 8 |
| Schizachyrium scoparium | (Michx.) Nash | Poaceae | 8 |
| Schoenoplectus acutus | (Muhl. ex Bigelow) Á.Löve & D.Löve | Cyperaceae | 8 |
| Schoenoplectus americanus | (Pers.) Volkart | Cyperaceae | 8 |
| Schoenoplectus californicus | (C.A.Mey.) Soják | Cyperaceae | 8 |
| Schoenoplectus heterochaetus | (Chase) Soják | Cyperaceae | 8 |
| Schoenoplectus pungens | (Vahl) Palla | Cyperaceae | 8 |
| Schoenoplectus subterminalis | (Torr.) Soják | Cyperaceae | 8 |
| Schoenoplectus tabernaemontani | (C.C.Gmel.) Palla | Cyperaceae | 8 |
| Schoenus nigricans | L. | Cyperaceae | 8 |
| Scirpus congdonii | Britton | Cyperaceae | 8 |
| Scirpus microcarpus | J.Presl & C.Presl | Cyperaceae | 8 |
| Scirpus pendulus | Muhl. | Cyperaceae | 8 |
| Sclerocactus polyancistrus | (Engelm. & J.M.Bigelow) Britton & Rose | Cactaceae | 8 |
| Scleropogon brevifolius | Phil. | Poaceae | 8 |
| Scoliopus bigelovii | Torr. | Liliaceae | 8 |
| Scopulophila rixfordii | (Brandegee) Munz & I.M.Johnst. | Caryophyllaceae | 8 |
| Scrophularia atrata | Pennell | Scrophulariaceae | 8 |
| Scrophularia californica | Cham. & Schltdl. | Scrophulariaceae | 8 |
| Scrophularia desertorum | (Munz) R.J.Shaw | Scrophulariaceae | 8 |
| Scrophularia lanceolata | Pursh | Scrophulariaceae | 8 |
| Scutellaria angustifolia | Pursh | Lamiaceae | 8 |
| Scutellaria antirrhinoides | Benth. | Lamiaceae | 8 |
| Scutellaria californica | A.Gray | Lamiaceae | 8 |
| Scutellaria galericulata | L. | Lamiaceae | 8 |
| Scutellaria lateriflora | L. | Lamiaceae | 8 |
| Scutellaria mexicana | (Torr.) A.J.Paton | Lamiaceae | 8 |
| Scutellaria nana | A.Gray | Lamiaceae | 8 |
| Scutellaria siphocampyloides | Vatke | Lamiaceae | 8 |
| Scutellaria tuberosa | Benth. | Lamiaceae | 8 |
| Sedum divergens | S.Watson | Crassulaceae | 8 |
| Sedum flavidum | (Denton) B.L.Wilson & Zika | Crassulaceae | 8 |
| Sedum kiersteadiae | B.L.Wilson & R.E.Brainerd | Crassulaceae | 8 |
| Sedum lanceolatum | Torr. | Crassulaceae | 8 |
| Sedum laxum | (Britton) A.Berger | Crassulaceae | 8 |
| Sedum obtusatum | A.Gray | Crassulaceae | 8 |
| Sedum oreganum | Nutt. | Crassulaceae | 8 |
| Sedum oregonense | (S.Watson) M.Peck | Crassulaceae | 8 |
| Sedum pumilum | Benth. | Crassulaceae | 8 |
| Sedum radiatum | S.Watson | Crassulaceae | 8 |
| Sedum spathulifolium | Hook. | Crassulaceae | 8 |
| Sedum stenopetalum | Pursh | Crassulaceae | 8 |
| Selaginella bigelovii | Underw. | Selaginellaceae | 8 |
| Selaginella cinerascens | A.A.Eaton | Selaginellaceae | 8 |
| Selaginella eremophila | Maxon | Selaginellaceae | 8 |
| Selaginella hansenii | Hieron. | Selaginellaceae | 8 |
| Selaginella leucobryoides | Maxon | Selaginellaceae | 8 |
| Selaginella oregana | D.C.Eaton | Selaginellaceae | 8 |
| Selaginella scopulorum | Maxon | Selaginellaceae | 8 |
| Selaginella wallacei | Hieron. | Selaginellaceae | 8 |
| Selaginella watsonii | Underw. | Selaginellaceae | 8 |
| Senecio aphanactis | Greene | Asteraceae | 8 |
| Senecio aronicoides | DC. | Asteraceae | 8 |
| Senecio californicus | DC. | Asteraceae | 8 |
| Senecio flaccidus | Less. | Asteraceae | 8 |
| Senecio fremontii | Torr. & A.Gray | Asteraceae | 8 |
| Senecio hydrophiloides | Rydb. | Asteraceae | 8 |
| Senecio hydrophilus | Nutt. | Asteraceae | 8 |
| Senecio integerrimus | Nutt. | Asteraceae | 8 |
| Senecio mohavensis | A.Gray | Asteraceae | 8 |
| Senecio scorzonella | Greene | Asteraceae | 8 |
| Senecio serra | Hook. | Asteraceae | 8 |
| Senecio spartioides | Torr. & A.Gray | Asteraceae | 8 |
| Senecio triangularis | Hook. | Asteraceae | 8 |
| Senegalia greggii | (A.Gray) Britton & Rose | Fabaceae | 8 |
| Senna armata | (S.Watson) H.S.Irwin & Barneby | Fabaceae | 8 |
| Senna covesii | (A.Gray) H.S.Irwin & Barneby | Fabaceae | 8 |
| Sequoia sempervirens | (D.Don) Endl. | Cupressaceae | 8 |
| Sequoiadendron giganteum | (Lindl.) J.Buchholz | Cupressaceae | 8 |
| Sericocarpus oregonensis | Nutt. | Asteraceae | 8 |
| Sesbania herbacea | (Mill.) McVaugh | Fabaceae | 8 |
| Setaria parviflora | (Poir.) Kerguélen | Poaceae | 8 |
| Shepherdia argentea | (Pursh) Nutt. | Elaeagnaceae | 8 |
| Shepherdia canadensis | (L.) Nutt. | Elaeagnaceae | 8 |
| Sibara deserti | (M.E.Jones) Rollins | Brassicaceae | 8 |
| Sibara filifolia | (Greene) Greene | Brassicaceae | 8 |
| Sibbaldia procumbens | L. | Rosaceae | 8 |
| Sidalcea calycosa | M.E.Jones | Malvaceae | 8 |
| Sidalcea covillei | Greene | Malvaceae | 8 |
| Sidalcea glaucescens | Greene | Malvaceae | 8 |
| Sidalcea keckii | Wiggins | Malvaceae | 8 |
| Sidalcea malviflora | (DC.) A.Gray | Malvaceae | 8 |
| Sidalcea neomexicana | A.Gray | Malvaceae | 8 |
| Sidalcea oregana | (Nutt. ex Torr. & A.Gray) A.Gray | Malvaceae | 8 |
| Sidalcea sparsifolia | (C.L.Hitchc.) S.R.Hill | Malvaceae | 8 |
| Sidotheca emarginata | (H.M.Hall) Reveal | Polygonaceae | 8 |
| Sidotheca trilobata | (A.Gray) Reveal | Polygonaceae | 8 |
| Silene antirrhina | L. | Caryophyllaceae | 8 |
| Silene bernardina | S.Watson | Caryophyllaceae | 8 |
| Silene campanulata | S.Watson | Caryophyllaceae | 8 |
| Silene douglasii | Hook. | Caryophyllaceae | 8 |
| Silene hookeri | Nutt. | Caryophyllaceae | 8 |
| Silene laciniata | Cav. | Caryophyllaceae | 8 |
| Silene lemmonii | S.Watson | Caryophyllaceae | 8 |
| Silene menziesii | Hook. | Caryophyllaceae | 8 |
| Silene oregana | S.Watson | Caryophyllaceae | 8 |
| Silene parishii | S.Watson | Caryophyllaceae | 8 |
| Silene sargentii | S.Watson | Caryophyllaceae | 8 |
| Silene scouleri | Hook. | Caryophyllaceae | 8 |
| Silene verecunda | S.Watson | Caryophyllaceae | 8 |
| Simmondsia chinensis | (Link) C.K.Schneid. | Simmondsiaceae | 8 |
| Simpsonanthus jonesii | (A.Gray) Guilliams, Hasenstab & B.G.Baldwin | Boraginaceae | 8 |
| Sisyrinchium bellum | S.Watson | Iridaceae | 8 |
| Sisyrinchium californicum | (Ker Gawl.) W.T.Aiton | Iridaceae | 8 |
| Sisyrinchium elmeri | Greene | Iridaceae | 8 |
| Sisyrinchium funereum | E.P.Bicknell | Iridaceae | 8 |
| Sisyrinchium halophilum | Greene | Iridaceae | 8 |
| Sisyrinchium idahoense | E.P.Bicknell | Iridaceae | 8 |
| Sium suave | Walter | Apiaceae | 8 |
| Smilax californica | (A.DC.) A.Gray | Smilacaceae | 8 |
| Solanum americanum | Mill. | Solanaceae | 8 |
| Solanum douglasii | Dunal | Solanaceae | 8 |
| Solanum elaeagnifolium | Cav. | Solanaceae | 8 |
| Solanum rostratum | Dunal | Solanaceae | 8 |
| Solanum triflorum | Nutt. | Solanaceae | 8 |
| Solanum umbelliferum | Eschsch. | Solanaceae | 8 |
| Solidago canadensis | L. | Asteraceae | 8 |
| Solidago confinis | A.Gray | Asteraceae | 8 |
| Solidago lepida | DC. | Asteraceae | 8 |
| Solidago multiradiata | Aiton | Asteraceae | 8 |
| Solidago spathulata | DC. | Asteraceae | 8 |
| Solidago velutina | DC. | Asteraceae | 8 |
| Sorbus californica | Greene | Rosaceae | 8 |
| Sorbus scopulina | Greene | Rosaceae | 8 |
| Sorbus sitchensis | M.Roem. | Rosaceae | 8 |
| Sparganium angustifolium | Michx. | Typhaceae | 8 |
| Sparganium emersum | Rehmann | Typhaceae | 8 |
| Sparganium eurycarpum | Engelm. | Typhaceae | 8 |
| Sparganium natans | L. | Typhaceae | 8 |
| Spergularia canadensis | (Pers.) G.Don | Caryophyllaceae | 8 |
| Spergularia macrotheca | (Hornem. ex Cham. & Schltdl.) Heynh. | Caryophyllaceae | 8 |
| Spergularia marina | (L.) Besser | Caryophyllaceae | 8 |
| Sphaeralcea ambigua | A.Gray | Malvaceae | 8 |
| Sphaeralcea coulteri | (S.Watson) A.Gray | Malvaceae | 8 |
| Sphaeralcea emoryi | Torr. ex A.Gray | Malvaceae | 8 |
| Sphaeralcea munroana | (Douglas ex Lindl.) Spach | Malvaceae | 8 |
| Sphaeralcea parvifolia | A.Nelson | Malvaceae | 8 |
| Sphaeralcea rusbyi | A.Gray | Malvaceae | 8 |
| Sphenopholis interrupta | (Buckley) Scribn. | Poaceae | 8 |
| Sphenopholis obtusata | (Michx.) Scribn. | Poaceae | 8 |
| Spiraea douglasii | Hook. | Rosaceae | 8 |
| Spiraea splendens | Baumann ex K.Koch | Rosaceae | 8 |
| Spiranthes perexilis | (Sheviak) M.C.Pace | Orchidaceae | 8 |
| Spiranthes porrifolia | Lindl. | Orchidaceae | 8 |
| Spiranthes romanzoffiana | Cham. | Orchidaceae | 8 |
| Spirodela polyrhiza | (L.) Schleid. | Araceae | 8 |
| Sporobolus airoides | (Torr.) Torr. | Poaceae | 8 |
| Sporobolus contractus | Hitchc. | Poaceae | 8 |
| Sporobolus cryptandrus | (Torr.) A.Gray | Poaceae | 8 |
| Sporobolus flexuosus | (Vasey) Rydb. | Poaceae | 8 |
| Sporobolus foliosus | (Trin.) P.M.Peterson & Saarela | Poaceae | 8 |
| Sporobolus hookerianus | P.M.Peterson & Saarela | Poaceae | 8 |
| Sporobolus neglectus | Nash | Poaceae | 8 |
| Sporobolus vaginiflorus | (Torr. ex A.Gray) Alph.Wood | Poaceae | 8 |
| Sporobolus wrightii | Scribn. | Poaceae | 8 |
| Stachys ajugoides | Benth. | Lamiaceae | 8 |
| Stachys albens | A.Gray | Lamiaceae | 8 |
| Stachys bullata | Benth. | Lamiaceae | 8 |
| Stachys chamissonis | Benth. | Lamiaceae | 8 |
| Stachys mexicana | Benth. | Lamiaceae | 8 |
| Stachys pilosa | Nutt. | Lamiaceae | 8 |
| Stachys pycnantha | Benth. | Lamiaceae | 8 |
| Stachys rigida | Nutt. ex Benth. | Lamiaceae | 8 |
| Stachys stebbinsii | G.A.Mulligan & D.B.Munro | Lamiaceae | 8 |
| Stanleya elata | M.E.Jones | Brassicaceae | 8 |
| Stanleya pinnata | (Pursh) Britton | Brassicaceae | 8 |
| Stanleya viridiflora | Nutt. | Brassicaceae | 8 |
| Stebbinsoseris heterocarpa | (Nutt.) K.L.Chambers | Asteraceae | 8 |
| Stellaria borealis | Bigelow | Caryophyllaceae | 8 |
| Stellaria crispa | Cham. & Schltdl. | Caryophyllaceae | 8 |
| Stellaria littoralis | Torr. | Caryophyllaceae | 8 |
| Stellaria longifolia | Muhl. ex Willd. | Caryophyllaceae | 8 |
| Stellaria longipes | Goldie | Caryophyllaceae | 8 |
| Stellaria nitens | Nutt. | Caryophyllaceae | 8 |
| Stemodia durantifolia | (L.) Sw. | Plantaginaceae | 8 |
| Stenotus acaulis | (Nutt.) Nutt. | Asteraceae | 8 |
| Stephanomeria cichoriacea | A.Gray | Asteraceae | 8 |
| Stephanomeria diegensis | Gottlieb | Asteraceae | 8 |
| Stephanomeria elata | Nutt. | Asteraceae | 8 |
| Stephanomeria exigua | Nutt. | Asteraceae | 8 |
| Stephanomeria lactucina | A.Gray | Asteraceae | 8 |
| Stephanomeria parryi | A.Gray | Asteraceae | 8 |
| Stephanomeria pauciflora | (Torr.) A.Nelson | Asteraceae | 8 |
| Stephanomeria virgata | Benth. | Asteraceae | 8 |
| Stillingia linearifolia | S.Watson | Euphorbiaceae | 8 |
| Stillingia spinulosa | Torr. | Euphorbiaceae | 8 |
| Streptanthus amplexicaulis | Jeps. | Brassicaceae | 8 |
| Streptanthus anceps | (Payson) Hoover | Brassicaceae | 8 |
| Streptanthus anomalus | D.L.Smith, A.Arthur & R.E.Preston | Brassicaceae | 8 |
| Streptanthus barbatus | S.Watson | Brassicaceae | 8 |
| Streptanthus barbiger | Greene | Brassicaceae | 8 |
| Streptanthus batrachopus | J.L.Morrison | Brassicaceae | 8 |
| Streptanthus bernardinus | (Greene) Parish | Brassicaceae | 8 |
| Streptanthus brachiatus | F.W.Hoffm. | Brassicaceae | 8 |
| Streptanthus breweri | A.Gray | Brassicaceae | 8 |
| Streptanthus californicus | Greene | Brassicaceae | 8 |
| Streptanthus callistus | J.L.Morrison | Brassicaceae | 8 |
| Streptanthus campestris | S.Watson | Brassicaceae | 8 |
| Streptanthus cooperi | (S.Watson) Al-Shehbaz | Brassicaceae | 8 |
| Streptanthus cordatus | Nutt. | Brassicaceae | 8 |
| Streptanthus coulteri | (S.Watson) Greene | Brassicaceae | 8 |
| Streptanthus crassicaulis | Torr. | Brassicaceae | 8 |
| Streptanthus diversifolius | S.Watson | Brassicaceae | 8 |
| Streptanthus drepanoides | Kruckeb. & J.L.Morrison | Brassicaceae | 8 |
| Streptanthus farnsworthianus | J.T.Howell | Brassicaceae | 8 |
| Streptanthus flavescens | Hook. | Brassicaceae | 8 |
| Streptanthus glandulosus | Hook. | Brassicaceae | 8 |
| Streptanthus glaucus | Jeps. | Brassicaceae | 8 |
| Streptanthus hallii | Jeps. | Brassicaceae | 8 |
| Streptanthus hesperidis | Jeps. | Brassicaceae | 8 |
| Streptanthus heterophyllus | Nutt. | Brassicaceae | 8 |
| Streptanthus hispidus | A.Gray | Brassicaceae | 8 |
| Streptanthus howellii | S.Watson | Brassicaceae | 8 |
| Streptanthus inflatus | Greene | Brassicaceae | 8 |
| Streptanthus lasiophyllus | Hook. & Arn. ex Hoover | Brassicaceae | 8 |
| Streptanthus longirostris | (S.Watson) S.Watson | Brassicaceae | 8 |
| Streptanthus morrisonii | F.W.Hoffm. | Brassicaceae | 8 |
| Streptanthus oblanceolatus | T.W.Nelson & J.P.Nelson | Brassicaceae | 8 |
| Streptanthus pilosus | Jeps. | Brassicaceae | 8 |
| Streptanthus polygaloides | A.Gray | Brassicaceae | 8 |
| Streptanthus simulans | (Payson) Jeps. | Brassicaceae | 8 |
| Streptanthus tortuosus | Kellogg | Brassicaceae | 8 |
| Streptopus amplexifolius | (L.) DC. | Liliaceae | 8 |
| Strombocarpa pubescens | (Benth.) A.Gray | Fabaceae | 8 |
| Struthiopteris spicant | (L.) Weiss | Blechnaceae | 8 |
| Stuckenia filiformis | (Pers.) Börner | Potamogetonaceae | 8 |
| Stuckenia pectinata | (L.) Börner | Potamogetonaceae | 8 |
| Stylocline gnaphalioides | Nutt. | Asteraceae | 8 |
| Stylocline micropoides | A.Gray | Asteraceae | 8 |
| Stylocline psilocarphoides | M.Peck | Asteraceae | 8 |
| Stylomecon crassifolia | (Benth.) Elvebakk & Bjerke | Papaveraceae | 8 |
| Stylomecon heterophylla | (Benth.) G.Taylor | Papaveraceae | 8 |
| Styrax redivivus | (Torr.) L.C.Wheeler | Styracaceae | 8 |
| Suaeda calceoliformis | (Hook.) Moq. | Chenopodiaceae | 8 |
| Suaeda californica | S.Watson | Chenopodiaceae | 8 |
| Suaeda nigra | (Raf.) J.F.Macbr. | Chenopodiaceae | 8 |
| Suaeda taxifolia | (Standl.) Standl. | Chenopodiaceae | 8 |
| Subularia aquatica | L. | Brassicaceae | 8 |
| Suksdorfia ranunculifolia | (Hook.) Engl. | Saxifragaceae | 8 |
| Swallenia alexandrae | (Swallen) Soderstr. & H.F.Decker | Poaceae | 8 |
| Swertia perennis | L. | Gentianaceae | 8 |
| Symphoricarpos albus | (L.) S.F.Blake | Caprifoliaceae | 8 |
| Symphoricarpos longiflorus | A.Gray | Caprifoliaceae | 8 |
| Symphoricarpos mollis | Nutt. | Caprifoliaceae | 8 |
| Symphoricarpos occidentalis | (R.Br.) Hook. | Caprifoliaceae | 8 |
| Symphoricarpos rotundifolius | A.Gray | Caprifoliaceae | 8 |
| Symphyotrichum ascendens | (Lindl.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum campestre | (Nutt.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum chilense | (Nees) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum defoliatum | (Parish) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum eatonii | (A.Gray) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum foliaceum | (Lindl. ex DC.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum frondosum | (Nutt.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum laeve | (L.) Á.Löve & D.Löve | Asteraceae | 8 |
| Symphyotrichum lanceolatum | (Willd.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum subspicatum | (Nees) G.L.Nesom | Asteraceae | 8 |
| Syntrichopappus lemmonii | (A.Gray) A.Gray | Asteraceae | 8 |
| Tanacetum bipinnatum | Sch.Bip. | Asteraceae | 8 |
| Taraxia ovata | (Nutt.) Small | Onagraceae | 8 |
| Taraxia subacaulis | Rydb. | Onagraceae | 8 |
| Taraxia tanacetifolia | (Torr. & A.Gray) Piper | Onagraceae | 8 |
| Tauschia arguta | (Torr. & A.Gray) J.F.Macbr. | Apiaceae | 8 |
| Tauschia hartwegii | (A.Gray) J.F.Macbr. | Apiaceae | 8 |
| Tauschia kelloggii | (A.Gray) J.F.Macbr. | Apiaceae | 8 |
| Tauschia parishii | (J.M.Coult. & Rose) J.F.Macbr. | Apiaceae | 8 |
| Taxus brevifolia | Nutt. | Taxaceae | 8 |
| Tellima grandiflora | (Pursh) Douglas ex Lindl. | Saxifragaceae | 8 |
| Tetracoccus dioicus | Parry | Picrodendraceae | 8 |
| Tetracoccus hallii | Brandegee | Picrodendraceae | 8 |
| Tetracoccus ilicifolius | Coville & Gilman | Picrodendraceae | 8 |
| Tetradymia axillaris | A.Nelson | Asteraceae | 8 |
| Tetradymia canescens | DC. | Asteraceae | 8 |
| Tetradymia comosa | A.Gray | Asteraceae | 8 |
| Tetradymia glabrata | Torr. & A.Gray | Asteraceae | 8 |
| Tetradymia spinosa | Hook. & Arn. | Asteraceae | 8 |
| Tetradymia tetrameres | (S.F.Blake) Strother | Asteraceae | 8 |
| Tetraneuris acaulis | Greene | Asteraceae | 8 |
| Tetrapteron graciliflorum | (Hook. & Arn.) W.L.Wagner & Hoch | Onagraceae | 8 |
| Teucrium depressum | Small | Lamiaceae | 8 |
| Teucrium glandulosum | Kellogg | Lamiaceae | 8 |
| Thalictrum alpinum | L. | Ranunculaceae | 8 |
| Thalictrum fendleri | Engelm. ex A.Gray | Ranunculaceae | 8 |
| Thalictrum occidentale | A.Gray | Ranunculaceae | 8 |
| Thalictrum polycarpum | (Torr.) S.Watson | Ranunculaceae | 8 |
| Thalictrum sparsiflorum | Turcz. ex Fisch. & C.A.Mey. | Ranunculaceae | 8 |
| Thamnosma montana | Torr. & Frém. | Rutaceae | 8 |
| Thelypodium crispum | Greene ex Payson | Brassicaceae | 8 |
| Thelypodium integrifolium | (Nutt.) Endl. | Brassicaceae | 8 |
| Thelypodium laciniatum | (Hook.) Endl. | Brassicaceae | 8 |
| Thelypodium milleflorum | A.Nelson | Brassicaceae | 8 |
| Thermopsis californica | S.Watson | Fabaceae | 8 |
| Thermopsis gracilis | Howell | Fabaceae | 8 |
| Thermopsis macrophylla | Hook. & Arn. | Fabaceae | 8 |
| Thermopsis robusta | Howell | Fabaceae | 8 |
| Thuja plicata | Donn ex D.Don | Cupressaceae | 8 |
| Thymophylla pentachaeta | (DC.) Small | Asteraceae | 8 |
| Thysanocarpus curvipes | Hook. | Brassicaceae | 8 |
| Thysanocarpus laciniatus | Nutt. | Brassicaceae | 8 |
| Thysanocarpus radians | Benth. | Brassicaceae | 8 |
| Tiarella trifoliata | L. | Saxifragaceae | 8 |
| Tidestromia lanuginosa | (Nutt.) Standl. | Amaranthaceae | 8 |
| Tidestromia suffruticosa | (Torr.) Standl. | Amaranthaceae | 8 |
| Tiquilia canescens | (DC.) A.T.Richardson | Ehretiaceae | 8 |
| Tiquilia nuttallii | (Hook.) A.T.Richardson | Ehretiaceae | 8 |
| Tiquilia palmeri | (A.Gray) A.T.Richardson | Ehretiaceae | 8 |
| Tiquilia plicata | (Torr.) A.T.Richardson | Ehretiaceae | 8 |
| Toiyabea peirsonii | (D.D.Keck) G.L.Nesom | Asteraceae | 8 |
| Tolmiea diplomenziesii | Judd, Soltis & P.S.Soltis | Saxifragaceae | 8 |
| Tomostima cuneifolia | (Nutt. ex Torr. & A.Gray) Al-Shehbaz, M.Koch & Jordon-Thaden | Brassicaceae | 8 |
| Tomostima reptans | (Lam.) Al-Shehbaz, M.Koch & Jordon-Thaden | Brassicaceae | 8 |
| Tonella tenella | (Benth.) A.Heller | Plantaginaceae | 8 |
| Tonestus lyallii | A.Nelson | Asteraceae | 8 |
| Torreya californica | Torr. | Taxaceae | 8 |
| Torreyostellaria jamesiana | (Torr.) Gang Yao, B.Xue & Z.Q.Song | Caryophyllaceae | 8 |
| Townsendia condensata | Parry | Asteraceae | 8 |
| Townsendia scapigera | D.C.Eaton | Asteraceae | 8 |
| Toxicodendron diversilobum | (Torr. & A.Gray) Greene | Anacardiaceae | 8 |
| Toxicoscordion brevibracteatum | (M.E.Jones) R.R.Gates | Melanthiaceae | 8 |
| Toxicoscordion exaltatum | (Eastw.) A.Heller | Melanthiaceae | 8 |
| Toxicoscordion fontanum | (Eastw.) Zomlefer & Judd | Melanthiaceae | 8 |
| Toxicoscordion fremontii | (Torr.) Rydb. | Melanthiaceae | 8 |
| Toxicoscordion micranthum | (Eastw.) A.Heller | Melanthiaceae | 8 |
| Toxicoscordion paniculatum | (Nutt.) Rydb. | Melanthiaceae | 8 |
| Toxicoscordion venenosum | (S.Watson) Rydb. | Melanthiaceae | 8 |
| Tragia ramosa | Torr. | Euphorbiaceae | 8 |
| Trautvetteria caroliniensis | (Walter) Vail | Ranunculaceae | 8 |
| Triantha occidentalis | (S.Watson) R.R.Gates | Tofieldiaceae | 8 |
| Trianthema portulacastrum | L. | Aizoaceae | 8 |
| Tricardia watsonii | Torr. ex S.Watson | Hydrophyllaceae | 8 |
| Trichogalium boreale | (L.) Fourr. | Rubiaceae | 8 |
| Trichogalium cliftonsmithii | (Dempster) Kadereit & Schneew. | Rubiaceae | 8 |
| Trichogalium matthewsii | (A.Gray) Kadereit & Schneew. | Rubiaceae | 8 |
| Trichogalium multiflorum | (Kellogg) Kadereit & Schneew. | Rubiaceae | 8 |
| Trichogalium oreganum | (Britton) Kadereit & Schneew. | Rubiaceae | 8 |
| Trichoptilium incisum | (A.Gray) A.Gray | Asteraceae | 8 |
| Trichostema lanatum | Benth. | Lamiaceae | 8 |
| Trichostema lanceolatum | Benth. | Lamiaceae | 8 |
| Trichostema laxum | A.Gray | Lamiaceae | 8 |
| Trichostema oblongum | Benth. | Lamiaceae | 8 |
| Trichostema parishii | Vasey | Lamiaceae | 8 |
| Trichostema rubisepalum | Elmer | Lamiaceae | 8 |
| Trichostema simulatum | Jeps. | Lamiaceae | 8 |
| Tridentopsis mutica | (Torr.) P.M.Peterson | Poaceae | 8 |
| Trifolium albopurpureum | Torr. & A.Gray | Fabaceae | 8 |
| Trifolium andersonii | A.Gray | Fabaceae | 8 |
| Trifolium barbigerum | Torr. | Fabaceae | 8 |
| Trifolium beckwithii | W.H.Brewer ex S.Watson | Fabaceae | 8 |
| Trifolium bifidum | A.Gray | Fabaceae | 8 |
| Trifolium breweri | S.Watson | Fabaceae | 8 |
| Trifolium ciliolatum | Benth. | Fabaceae | 8 |
| Trifolium cyathiferum | Lindl. | Fabaceae | 8 |
| Trifolium dedeckerae | J.M.Gillett | Fabaceae | 8 |
| Trifolium depauperatum | Desv. | Fabaceae | 8 |
| Trifolium dichotomum | Hook. & Arn. | Fabaceae | 8 |
| Trifolium eriocephalum | Nutt. | Fabaceae | 8 |
| Trifolium fucatum | Lindl. | Fabaceae | 8 |
| Trifolium gracilentum | Torr. & A.Gray | Fabaceae | 8 |
| Trifolium grayi | Lojac. | Fabaceae | 8 |
| Trifolium gymnocarpon | Nutt. | Fabaceae | 8 |
| Trifolium hydrophilum | Greene | Fabaceae | 8 |
| Trifolium lemmonii | S.Watson | Fabaceae | 8 |
| Trifolium longipes | Nutt. | Fabaceae | 8 |
| Trifolium macraei | Hook. & Arn. | Fabaceae | 8 |
| Trifolium macrocephalum | (Pursh) Poir. | Fabaceae | 8 |
| Trifolium microcephalum | Pursh | Fabaceae | 8 |
| Trifolium microdon | Hook. & Arn. | Fabaceae | 8 |
| Trifolium monanthum | A.Gray | Fabaceae | 8 |
| Trifolium obtusiflorum | Hook. | Fabaceae | 8 |
| Trifolium oliganthum | Steud. | Fabaceae | 8 |
| Trifolium palmeri | S.Watson | Fabaceae | 8 |
| Trifolium productum | Greene | Fabaceae | 8 |
| Trifolium variegatum | Nutt. | Fabaceae | 8 |
| Trifolium willdenovii | Spreng. | Fabaceae | 8 |
| Trifolium wormskioldii | Lehm. | Fabaceae | 8 |
| Triglochin maritima | L. | Juncaginaceae | 8 |
| Triglochin palustris | L. | Juncaginaceae | 8 |
| Triglochin scilloides | (Poir.) Mering & Kadereit | Juncaginaceae | 8 |
| Triglochin striata | Ruiz & Pav. | Juncaginaceae | 8 |
| Trillium albidum | J.D.Freeman | Melanthiaceae | 8 |
| Trillium angustipetalum | (Torr.) J.D.Freeman | Melanthiaceae | 8 |
| Trillium chloropetalum | (Torr.) Howell | Melanthiaceae | 8 |
| Trillium kurabayashii | J.D.Freeman | Melanthiaceae | 8 |
| Trillium ovatum | Pursh | Melanthiaceae | 8 |
| Triodanis perfoliata | (L.) Nieuwl. | Campanulaceae | 8 |
| Triphysaria eriantha | (Benth.) T.I.Chuang & Heckard | Orobanchaceae | 8 |
| Triphysaria floribunda | (Benth.) T.I.Chuang & Heckard | Orobanchaceae | 8 |
| Triphysaria micrantha | (Greene ex A.Heller) T.I.Chuang & Heckard | Orobanchaceae | 8 |
| Triphysaria pusilla | (Benth.) T.I.Chuang & Heckard | Orobanchaceae | 8 |
| Triphysaria versicolor | Fisch. & C.A.Mey. | Orobanchaceae | 8 |
| Triteleia bridgesii | (S.Watson) Greene | Asparagaceae | 8 |
| Triteleia crocea | (Alph.Wood) Greene | Asparagaceae | 8 |
| Triteleia grandiflora | Lindl. | Asparagaceae | 8 |
| Triteleia hendersonii | Greene | Asparagaceae | 8 |
| Triteleia laxa | Benth. | Asparagaceae | 8 |
| Triteleia lilacina | Greene | Asparagaceae | 8 |
| Triteleia lugens | Greene | Asparagaceae | 8 |
| Triteleia peduncularis | Lindl. | Asparagaceae | 8 |
| Triteleia piutensis | Kentner & K.E.Steiner | Asparagaceae | 8 |
| Trixis californica | Kellogg | Asteraceae | 8 |
| Tropidocarpum gracile | Hook. | Brassicaceae | 8 |
| Tsuga heterophylla | (Raf.) Sarg. | Pinaceae | 8 |
| Tsuga mertensiana | (Bong.) Carrière | Pinaceae | 8 |
| Turritis glabra | L. | Brassicaceae | 8 |
| Typha angustifolia | L. | Typhaceae | 8 |
| Typha domingensis | Pers. | Typhaceae | 8 |
| Typha latifolia | L. | Typhaceae | 8 |
| Umbellularia californica | (Hook. & Arn.) Nutt. | Lauraceae | 8 |
| Urochloa arizonica | (Scribn. & Merr.) Morrone & Zuloaga | Poaceae | 8 |
| Uropappus lindleyi | (DC.) Nutt. | Asteraceae | 8 |
| Urtica gracilis | Aiton | Urticaceae | 8 |
| Utricularia intermedia | Hayne | Lentibulariaceae | 8 |
| Utricularia macrorhiza | Leconte | Lentibulariaceae | 8 |
| Utricularia minor | L. | Lentibulariaceae | 8 |
| Vaccinium cespitosum | Michx. | Ericaceae | 8 |
| Vaccinium deliciosum | Piper | Ericaceae | 8 |
| Vaccinium ovatum | Pursh | Ericaceae | 8 |
| Vaccinium oxycoccos | L. | Ericaceae | 8 |
| Vaccinium parvifolium | Sm. | Ericaceae | 8 |
| Vaccinium scoparium | Leiberg ex Coville | Ericaceae | 8 |
| Vaccinium uliginosum | L. | Ericaceae | 8 |
| Vachellia farnesiana | (L.) Wight & Arn. | Fabaceae | 8 |
| Vahlodea atropurpurea | (Wahlenb.) Fr. | Poaceae | 8 |
| Valeriana acutiloba | Rydb. | Caprifoliaceae | 8 |
| Valeriana californica | A.Heller | Caprifoliaceae | 8 |
| Valeriana ciliosa | (Greene) Byng & Christenh. | Caprifoliaceae | 8 |
| Valeriana congesta | (Lindl.) Byng & Christenh. | Caprifoliaceae | 8 |
| Valeriana dioica | L. | Caprifoliaceae | 8 |
| Valeriana macrocera | (Torr. & A.Gray) Byng & Christenh. | Caprifoliaceae | 8 |
| Valeriana occidentalis | A.Heller | Caprifoliaceae | 8 |
| Valeriana sitchensis | Bong. | Caprifoliaceae | 8 |
| Vancouveria chrysantha | Greene | Berberidaceae | 8 |
| Vancouveria hexandra | C.Morren & Decne. | Berberidaceae | 8 |
| Vancouveria planipetala | Calloni | Berberidaceae | 8 |
| Venegasia carpesioides | DC. | Asteraceae | 8 |
| Veratrum californicum | Durand | Melanthiaceae | 8 |
| Veratrum fimbriatum | A.Gray | Melanthiaceae | 8 |
| Veratrum insolitum | Jeps. | Melanthiaceae | 8 |
| Veratrum viride | Aiton | Melanthiaceae | 8 |
| Verbena bracteata | Cav. ex Lag. & Rodr. | Verbenaceae | 8 |
| Verbena californica | Moldenke | Verbenaceae | 8 |
| Verbena canescens | Kunth | Verbenaceae | 8 |
| Verbena gooddingii | Briq. | Verbenaceae | 8 |
| Verbena hastata | L. | Verbenaceae | 8 |
| Verbena lasiostachys | Link | Verbenaceae | 8 |
| Verbena menthifolia | Benth. | Verbenaceae | 8 |
| Verbena neomexicana | (A.Gray) Briq. | Verbenaceae | 8 |
| Verbena scabra | Vahl | Verbenaceae | 8 |
| Verbesina dissita | A.Gray | Asteraceae | 8 |
| Veronica americana | (Raf.) Schwein. ex Benth. | Plantaginaceae | 8 |
| Veronica californica | M.M.Mart.Ort. & Albach | Plantaginaceae | 8 |
| Veronica catenata | Pennell | Plantaginaceae | 8 |
| Veronica copelandii | Eastw. | Plantaginaceae | 8 |
| Veronica cusickii | A.Gray | Plantaginaceae | 8 |
| Veronica missurica | Raf. | Plantaginaceae | 8 |
| Veronica peregrina | L. | Plantaginaceae | 8 |
| Veronica regina-nivalis | M.M.Mart.Ort. & Albach | Plantaginaceae | 8 |
| Veronica scutellata | L. | Plantaginaceae | 8 |
| Veronica serpyllifolia | L. | Plantaginaceae | 8 |
| Veronica wormskjoldii | Roem. & Schult. | Plantaginaceae | 8 |
| Vesper multinervatus | (J.M.Coult. & Rose) R.L.Hartm. & G.L.Nesom | Apiaceae | 8 |
| Vesper purpurascens | (A.Gray) R.L.Hartm. & G.L.Nesom | Apiaceae | 8 |
| Viburnum edule | (Michx.) Raf. | Viburnaceae | 8 |
| Viburnum ellipticum | Hook. | Viburnaceae | 8 |
| Vicia americana | Muhl. ex Willd. | Fabaceae | 8 |
| Vicia hassei | S.Watson | Fabaceae | 8 |
| Vicia ludoviciana | Nutt. | Fabaceae | 8 |
| Vicia nigricans | Hook. & Arn. | Fabaceae | 8 |
| Viola adunca | Sm. | Violaceae | 8 |
| Viola bakeri | Greene | Violaceae | 8 |
| Viola cuneata | S.Watson | Violaceae | 8 |
| Viola douglasii | Steud. | Violaceae | 8 |
| Viola glabella | Nutt. | Violaceae | 8 |
| Viola hallii | A.Gray | Violaceae | 8 |
| Viola howellii | A.Gray | Violaceae | 8 |
| Viola langsdorffii | Fisch. ex Ging. | Violaceae | 8 |
| Viola lobata | Benth. | Violaceae | 8 |
| Viola macloskeyi | F.E.Lloyd | Violaceae | 8 |
| Viola nephrophylla | Greene | Violaceae | 8 |
| Viola ocellata | Torr. & A.Gray | Violaceae | 8 |
| Viola palustris | L. | Violaceae | 8 |
| Viola pedunculata | Torr. & A.Gray | Violaceae | 8 |
| Viola pinetorum | Greene | Violaceae | 8 |
| Viola praemorsa | Douglas | Violaceae | 8 |
| Viola primulifolia | L. | Violaceae | 8 |
| Viola purpurea | Kellogg | Violaceae | 8 |
| Viola sempervirens | Greene | Violaceae | 8 |
| Viola sheltonii | Torr. | Violaceae | 8 |
| Viola tomentosa | M.S.Baker & J.C.Clausen | Violaceae | 8 |
| Vitis californica | Benth. | Vitaceae | 8 |
| Washingtonia filifera | (Rafarin) H.Wendl. ex de Bary | Arecaceae | 8 |
| Whipplea modesta | Torr. | Hydrangeaceae | 8 |
| Wolffia borealis | (Engelm.) Landolt | Araceae | 8 |
| Wolffia brasiliensis | Wedd. | Araceae | 8 |
| Wolffia columbiana | H.Karst. | Araceae | 8 |
| Woodsia oregana | D.C.Eaton | Woodsiaceae | 8 |
| Woodsia scopulina | D.C.Eaton | Woodsiaceae | 8 |
| Woodwardia fimbriata | Sm. | Blechnaceae | 8 |
| Wyethia angustifolia | Nutt. | Asteraceae | 8 |
| Wyethia helenioides | Nutt. | Asteraceae | 8 |
| Wyethia mollis | A.Gray | Asteraceae | 8 |
| Xanthisma gracile | (Nutt.) D.R.Morgan & R.L.Hartm. | Asteraceae | 8 |
| Xanthisma junceum | (Greene) D.R.Morgan & R.L.Hartm. | Asteraceae | 8 |
| Xanthisma spinulosum | (Pursh) D.R.Morgan & R.L.Hartm. | Asteraceae | 8 |
| Xanthium orientale | L. | Asteraceae | 8 |
| Xanthium spinosum | L. | Asteraceae | 8 |
| Xerophyllum tenax | (Pursh) Nutt. | Melanthiaceae | 8 |
| Xylococcus bicolor | Nutt. | Ericaceae | 8 |
| Xylorhiza cognata | (H.M.Hall) T.J.Watson | Asteraceae | 8 |
| Xylorhiza orcuttii | Greene | Asteraceae | 8 |
| Xylorhiza tortifolia | Greene | Asteraceae | 8 |
| Yabea microcarpa | Koso-Pol. | Apiaceae | 8 |
| Yosemitea repanda | (S.Watson) P.J.Alexander & Windham | Brassicaceae | 8 |
| Yucca baccata | Torr. | Asparagaceae | 8 |
| Yucca brevifolia | Engelm. | Asparagaceae | 8 |
| Yucca schidigera | Roezl ex Ortgies | Asparagaceae | 8 |
| Zannichellia palustris | L. | Potamogetonaceae | 8 |
| Zeltnera davyi | (Jeps.) G.Mans. | Gentianaceae | 8 |
| Zeltnera exaltata | (Griseb.) G.Mans. | Gentianaceae | 8 |
| Zeltnera namatophila | (Reveal, C.R.Broome & Beatley) G.Mans. | Gentianaceae | 8 |
| Zeltnera trichantha | (Griseb.) G.Mans. | Gentianaceae | 8 |
| Zeltnera venusta | (A.Gray) G.Mans. | Gentianaceae | 8 |
| Zizania palustris | L. | Poaceae | 8 |
| Zostera marina | L. | Zosteraceae | 8 |
| Zygophyllum laeve | (Standl.) Christenh. & Byng | Zygophyllaceae | 8 |
| Zygophyllum pachyacanthum | (Rydb.) Christenh. & Byng | Zygophyllaceae | 8 |
| Acmispon rubriflorus | (H.Sharsm.) D.D.Sokoloff | Fabaceae | 7 |
| Agoseris monticola | Greene | Asteraceae | 7 |
| Allium sanbornii | Alph.Wood | Amaryllidaceae | 7 |
| Antennaria flagellaris | A.Gray | Asteraceae | 7 |
| Arctostaphylos stanfordiana | Parry | Ericaceae | 7 |
| Astragalus accidens | S.Watson | Fabaceae | 7 |
| Astragalus pulsiferae | A.Gray | Fabaceae | 7 |
| Astragalus subvestitus | (Jeps.) Barneby | Fabaceae | 7 |
| Boechera xylopoda | Windham & Al-Shehbaz | Brassicaceae | 7 |
| Bromus marginatus | Nees ex Steud. | Poaceae | 7 |
| Camissoniopsis confusa | (P.H.Raven) W.L.Wagner & Hoch | Onagraceae | 7 |
| Carex integra | Mack. | Cyperaceae | 7 |
| Carex simulata | Mack. | Cyperaceae | 7 |
| Carex vernacula | L.H.Bailey | Cyperaceae | 7 |
| Castilleja peckiana | Pennell | Orobanchaceae | 7 |
| Ceanothus diversifolius | Kellogg | Rhamnaceae | 7 |
| Chlorogalum angustifolium | Kellogg | Asparagaceae | 7 |
| Chylismia munzii | (P.H.Raven) W.L.Wagner & Hoch | Onagraceae | 7 |
| Clarkia imbricata | F.H.Lewis & M.E.Lewis | Onagraceae | 7 |
| Cordylanthus parviflorus | (Ferris) Wiggins | Orobanchaceae | 7 |
| Crepis modocensis | Greene | Asteraceae | 7 |
| Crepis runcinata | (E.James) Torr. & A.Gray | Asteraceae | 7 |
| Cryptantha crinita | Greene | Boraginaceae | 7 |
| Cryptantha ganderi | I.M.Johnst. | Boraginaceae | 7 |
| Delphinium uliginosum | Curran | Ranunculaceae | 7 |
| Diplacus rutilus | (A.L.Grant) McMinn | Phrymaceae | 7 |
| Enemion stipitatum | J.R.Drumm. & Hutch. | Ranunculaceae | 7 |
| Ephedra funerea | Coville & C.V.Morton | Ephedraceae | 7 |
| Epilobium rigidum | Hausskn. | Onagraceae | 7 |
| Eriastrum sparsiflorum | (Eastw.) H.Mason | Polemoniaceae | 7 |
| Eriochloa acuminata | (J.Presl) Kunth | Poaceae | 7 |
| Eriogonum diclinum | Reveal | Polygonaceae | 7 |
| Eriogonum gossypinum | Curran | Polygonaceae | 7 |
| Erythranthe exigua | (A.Gray) G.L.Nesom & N.S.Fraga | Phrymaceae | 7 |
| Erythronium tuolumnense | Applegate | Liliaceae | 7 |
| Festuca saximontana | Rydb. | Poaceae | 7 |
| Hesperocyparis bakeri | (Jeps.) Bartel | Cupressaceae | 7 |
| Iris munzii | R.C.Foster | Iridaceae | 7 |
| Juncus bolanderi | Engelm. | Juncaceae | 7 |
| Juncus orthophyllus | Coville | Juncaceae | 7 |
| Juncus oxymeris | Engelm. | Juncaceae | 7 |
| Lewisia kelloggii | K.Brandegee | Montiaceae | 7 |
| Linanthus bigelovii | (A.Gray) Greene | Polemoniaceae | 7 |
| Linum spergulinum | A.Gray | Linaceae | 7 |
| Lomatium stebbinsii | Schlessman & Constance | Apiaceae | 7 |
| Lupinus lapidicola | A.Heller | Fabaceae | 7 |
| Lyonothamnus floribundus | A.Gray | Rosaceae | 7 |
| Madia radiata | Kellogg | Asteraceae | 7 |
| Marina orcuttii | (S.Watson) Barneby | Fabaceae | 7 |
| Matricaria occidentalis | Greene | Asteraceae | 7 |
| Mentzelia jonesii | (Urb. & Gilg) H.J.Thomps. & J.E.Roberts | Loasaceae | 7 |
| Mentzelia tridentata | (Davidson) H.J.Thomps. & J.E.Roberts | Loasaceae | 7 |
| Microseris elegans | Greene ex A.Gray | Asteraceae | 7 |
| Monardella australis | Abrams | Lamiaceae | 7 |
| Monardella linoides | A.Gray | Lamiaceae | 7 |
| Nemacladus rigidus | Curran | Campanulaceae | 7 |
| Orthocarpus pachystachyus | A.Gray | Orobanchaceae | 7 |
| Penstemon rattanii | A.Gray | Plantaginaceae | 7 |
| Perideridia oregana | (Nutt.) Mathias | Apiaceae | 7 |
| Phacelia cookei | Constance & Heckard | Hydrophyllaceae | 7 |
| Phacelia mustelina | Coville | Hydrophyllaceae | 7 |
| Phacelia tetramera | J.T.Howell | Hydrophyllaceae | 7 |
| Phlox hirsuta | E.E.Nelson | Polemoniaceae | 7 |
| Plagiobothrys mollis | (A.Gray) I.M.Johnst. | Boraginaceae | 7 |
| Plagiobothrys myosotoides | Brand | Boraginaceae | 7 |
| Plantago eriopoda | Torr. | Plantaginaceae | 7 |
| Ptilagrostiella kingii | (Bol.) Romasch. | Poaceae | 7 |
| Rhus lentii | Kellogg | Anacardiaceae | 7 |
| Ribes marshallii | Greene | Grossulariaceae | 7 |
| Sabulina rosei | (Maguire & Barneby) Dillenb. & Kadereit | Caryophyllaceae | 7 |
| Sanicula saxatilis | Greene | Apiaceae | 7 |
| Sidalcea multifida | Greene | Malvaceae | 7 |
| Silene serpentinicola | T.W.Nelson & J.P.Nelson | Caryophyllaceae | 7 |
| Sisyrinchium hitchcockii | Douglass M.Hend. | Iridaceae | 7 |
| Smelowskia ovalis | M.E.Jones | Brassicaceae | 7 |
| Smilax jamesii | G.A.Wallace | Smilacaceae | 7 |
| Solidago guiradonis | A.Gray | Asteraceae | 7 |
| Streptanthus longisiliquus | G.Clifton & R.E.Buck | Brassicaceae | 7 |
| Streptanthus major | Jeps. | Brassicaceae | 7 |
| Streptanthus medeirosii | N.Jensen | Brassicaceae | 7 |
| Suaeda occidentalis | (S.Watson) S.Watson | Chenopodiaceae | 7 |
| Trichocoronis wrightii | A.Gray | Asteraceae | 7 |
| Trifolium howellii | S.Watson | Fabaceae | 7 |
| Triteleia clementina | Hoover | Asparagaceae | 7 |
| Triteleia montana | Hoover | Asparagaceae | 7 |
| Zeltnera muehlenbergii | (Griseb.) G.Mans. | Gentianaceae | 7 |
| Allium atrorubens | S.Watson | Amaryllidaceae | 6 |
| Allium parishii | S.Watson | Amaryllidaceae | 6 |
| Astragalus argophyllus | Nutt. | Fabaceae | 6 |
| Astragalus geyeri | A.Gray | Fabaceae | 6 |
| Astragalus lentiformis | A.Gray | Fabaceae | 6 |
| Astragalus macrodon | (Hook. & Arn.) A.Gray | Fabaceae | 6 |
| Bacopa eisenii | (Kellogg) Pennell | Plantaginaceae | 6 |
| Boechera hoffmannii | (Munz) Al-Shehbaz | Brassicaceae | 6 |
| Boechera lincolnensis | Windham & Al-Shehbaz | Brassicaceae | 6 |
| Boechera rollei | (Rollins) Al-Shehbaz | Brassicaceae | 6 |
| Bromus pseudolaevipes | Wagnon | Poaceae | 6 |
| Camissonia pubens | (S.Watson) P.H.Raven | Onagraceae | 6 |
| Cardamine pachystigma | (S.Watson) Rollins | Brassicaceae | 6 |
| Carex halliana | L.H.Bailey | Cyperaceae | 6 |
| Carlquistia muirii | (A.Gray) B.G.Baldwin | Asteraceae | 6 |
| Castilleja gleasoni | Elmer | Orobanchaceae | 6 |
| Castilleja lasiorhyncha | (A.Gray) T.I.Chuang & Heckard | Orobanchaceae | 6 |
| Chorizanthe howellii | Goodman | Polygonaceae | 6 |
| Collomia tenella | A.Gray | Polemoniaceae | 6 |
| Cryptantha kinkiensis | Rebman & M.G.Simpson | Boraginaceae | 6 |
| Delphinium bakeri | Ewan | Ranunculaceae | 6 |
| Descurainia adenophora | (Wooton & Standl.) O.E.Schulz | Brassicaceae | 6 |
| Dimeresia howellii | A.Gray | Asteraceae | 6 |
| Eriocoma latiglumis | (Swallen) Romasch. | Poaceae | 6 |
| Eriogonum dasyanthemum | Torr. & A.Gray | Polygonaceae | 6 |
| Eriogonum nervulosum | (S.Stokes) Reveal | Polygonaceae | 6 |
| Eryngium mathiasiae | M.Y.Sheikh | Apiaceae | 6 |
| Euphrosyne acerosa | (Nutt.) Panero | Asteraceae | 6 |
| Gayophytum diffusum | Torr. & A.Gray | Onagraceae | 6 |
| Gilia malior | A.G.Day & V.E.Grant | Polemoniaceae | 6 |
| Hymenothrix loomisii | S.F.Blake | Asteraceae | 6 |
| Imperata brevifolia | Vasey | Poaceae | 6 |
| Isoetes occidentalis | L.F.Hend. | Isoetaceae | 6 |
| Jepsonia malvifolia | Small | Saxifragaceae | 6 |
| Juncus chlorocephalus | Engelm. | Juncaceae | 6 |
| Lathrocasis tenerrima | (A.Gray) L.A.Johnson | Polemoniaceae | 6 |
| Layia discoidea | D.D.Keck | Asteraceae | 6 |
| Lepidium latipes | Hook. | Brassicaceae | 6 |
| Leptosiphon pachyphyllus | (R.Patt.) J.M.Porter & L.A.Johnson | Polemoniaceae | 6 |
| Leptosiphon serrulatus | (Greene) J.M.Porter & L.A.Johnson | Polemoniaceae | 6 |
| Lessingia micradenia | Greene | Asteraceae | 6 |
| Lomatium repostum | (Jeps.) Mathias | Apiaceae | 6 |
| Lupinus wyethii | S.Watson | Fabaceae | 6 |
| Melica spectabilis | Scribn. | Poaceae | 6 |
| Mirabilis greenei | S.Watson | Nyctaginaceae | 6 |
| Nama depressa | Lemmon ex A.Gray | Namaceae | 6 |
| Navarretia heterandra | H.Mason | Polemoniaceae | 6 |
| Navarretia sinistra | (M.E.Jones) L.A.Johnson | Polemoniaceae | 6 |
| Oreocarya crymophila | (I.M.Johnst.) Jeps. & Hoover | Boraginaceae | 6 |
| Ozomelis diversifolia | (Greene) Rydb. | Saxifragaceae | 6 |
| Paronychia ahartii | Ertter | Caryophyllaceae | 6 |
| Penstemon personatus | D.D.Keck | Plantaginaceae | 6 |
| Phacelia lemmonii | A.Gray | Hydrophyllaceae | 6 |
| Phacelia leonis | J.T.Howell | Hydrophyllaceae | 6 |
| Phalaris angusta | Nees ex Trin. | Poaceae | 6 |
| Polygonum ramosissimum | Michx. | Polygonaceae | 6 |
| Potentilla kingii | (S.Watson) Greene | Rosaceae | 6 |
| Potentilla sericata | (S.Watson) Greene | Rosaceae | 6 |
| Potentilla wilderae | (Parish) Munz & I.M.Johnst. | Rosaceae | 6 |
| Psilocarphus chilensis | A.Gray | Asteraceae | 6 |
| Puccinellia simplex | Scribn. | Poaceae | 6 |
| Sabulina howellii | (S.Watson) Dillenb. & Kadereit | Caryophyllaceae | 6 |
| Saltugilia caruifolia | (Abrams) L.A.Johnson | Polemoniaceae | 6 |
| Saxifragopsis fragarioides | Small | Saxifragaceae | 6 |
| Spermolepis infernensis | G.L.Nesom | Apiaceae | 6 |
| Trichophorum pumilum | (Vahl) Schinz & Thell. | Cyperaceae | 6 |
| Trifolium bolanderi | A.Gray | Fabaceae | 6 |
| Woodsia plummerae | Lemmon | Woodsiaceae | 6 |
| Agrostis lacuna-vernalis | P.M.Peterson & Soreng | Poaceae | 5 |
| Alchemilla aphanoides | Mutis ex L.f. | Rosaceae | 5 |
| Allium tolmiei | Baker | Amaryllidaceae | 5 |
| Allium tuolumnense | (Ownbey & Aase ex Traub) S.S.Denison & McNeal | Amaryllidaceae | 5 |
| Amsinckiopsis kingii | (S.Watson) Guilliams, Hasenstab & B.G.Baldwin | Boraginaceae | 5 |
| Arceuthobium tsugense | (Rosend.) G.N.Jones | Santalaceae | 5 |
| Arctostaphylos klamathensis | S.W.Edwards, Keeler-Wolf & W.Knight | Ericaceae | 5 |
| Aristida schiedeana | Trin. & Rupr. | Poaceae | 5 |
| Astragalus bicristatus | A.Gray | Fabaceae | 5 |
| Atriplex truncata | (Torr. ex S.Watson) A.Gray | Chenopodiaceae | 5 |
| Boechera tiehmii | (Rollins) Al-Shehbaz | Brassicaceae | 5 |
| Bromus orcuttianus | Vasey | Poaceae | 5 |
| Camissoniopsis intermedia | (P.H.Raven) W.L.Wagner & Hoch | Onagraceae | 5 |
| Carex helleri | Mack. | Cyperaceae | 5 |
| Carex jonesii | L.H.Bailey | Cyperaceae | 5 |
| Carex oederi | Retz. | Cyperaceae | 5 |
| Carex praeceptorum | Mack. | Cyperaceae | 5 |
| Castilleja montigena | Heckard | Orobanchaceae | 5 |
| Cerastium viride | A.Heller | Caryophyllaceae | 5 |
| Chorizanthe polygonoides | Torr. & A.Gray | Polygonaceae | 5 |
| Cirsium fontinale | Jeps. | Asteraceae | 5 |
| Collinsia corymbosa | Herder | Plantaginaceae | 5 |
| Cryptantha glomeriflora | Greene | Boraginaceae | 5 |
| Cryptantha muricata | (Hook. & Arn.) A.Nelson & J.F.Macbr. | Boraginaceae | 5 |
| Cuscuta salina | Engelm. | Convolvulaceae | 5 |
| Deinandra mohavensis | (D.D.Keck) B.G.Baldwin | Asteraceae | 5 |
| Delphinium luteum | A.Heller | Ranunculaceae | 5 |
| Drymocallis lactea | (Greene) Rydb. | Rosaceae | 5 |
| Drymocallis pseudorupestris | (Rydb.) Rydb. | Rosaceae | 5 |
| Dudleya stolonifera | Moran | Crassulaceae | 5 |
| Eleocharis flavescens | (Poir.) Urb. | Cyperaceae | 5 |
| Elymus arizonicus | (Scribn. & J.G.Sm.) Gould | Poaceae | 5 |
| Ericameria fasciculata | J.F.Macbr. | Asteraceae | 5 |
| Eriocoma lemmonii | (Vasey) Romasch. | Poaceae | 5 |
| Erythranthe utahensis | (Pennell) G.L.Nesom | Phrymaceae | 5 |
| Gayophytum racemosum | Torr. & A.Gray | Onagraceae | 5 |
| Gentiana fremontii | Torr. | Gentianaceae | 5 |
| Gilia modocensis | Eastw. | Polemoniaceae | 5 |
| Harmonia stebbinsii | (T.W.Nelson & J.P.Nelson) B.G.Baldwin | Asteraceae | 5 |
| Hesperidanthus jaegeri | (Rollins) Al-Shehbaz | Brassicaceae | 5 |
| Iris innominata | L.F.Hend. | Iridaceae | 5 |
| Lagophylla glandulosa | A.Gray | Asteraceae | 5 |
| Lathyrus jepsonii | Greene | Fabaceae | 5 |
| Leptosiphon nudatus | (Greene) J.M.Porter & L.A.Johnson | Polemoniaceae | 5 |
| Lewisia congdonii | (Rydb.) S.Clay | Montiaceae | 5 |
| Lupinus covillei | Greene | Fabaceae | 5 |
| Lupinus ludovicianus | Greene | Fabaceae | 5 |
| Maculigilia maculata | (Parish) V.E.Grant | Polemoniaceae | 5 |
| Micromonolepis pusilla | (Torr. ex S.Watson) Ulbr. | Chenopodiaceae | 5 |
| Monardella stoneana | Elvin & A.C.Sanders | Lamiaceae | 5 |
| Muhlenbergia andina | (Nutt.) Hitchc. | Poaceae | 5 |
| Navarretia linearifolia | (Howell) L.A.Johnson | Polemoniaceae | 5 |
| Nemacladus longiflorus | A.Gray | Campanulaceae | 5 |
| Neostapfia colusana | (Burtt Davy) Burtt Davy | Poaceae | 5 |
| Nothocalais alpestris | (A.Gray) K.L.Chambers | Asteraceae | 5 |
| Oreocarya nubigena | Greene | Boraginaceae | 5 |
| Orobanche parishii | (Jeps.) Heckard | Orobanchaceae | 5 |
| Pediomelum mephiticum | (S.Watson) Rydb. | Fabaceae | 5 |
| Phacelia argentea | A.Nelson & J.F.Macbr. | Hydrophyllaceae | 5 |
| Phacelia mutabilis | Greene | Hydrophyllaceae | 5 |
| Phacelia platyloba | A.Gray | Hydrophyllaceae | 5 |
| Phalaris californica | Hook. & Arn. | Poaceae | 5 |
| Phoradendron libocedri | (Engelm.) Howell | Santalaceae | 5 |
| Poa sierrae | J.T.Howell | Poaceae | 5 |
| Polygonum polygaloides | Meisn. | Polygonaceae | 5 |
| Potentilla howellii | Greene | Rosaceae | 5 |
| Pyrola crypta | Jolles | Ericaceae | 5 |
| Rhynchospora californica | Gale | Cyperaceae | 5 |
| Ribes binominatum | A.Heller | Grossulariaceae | 5 |
| Sairocarpus cornutus | (Benth.) D.A.Sutton | Plantaginaceae | 5 |
| Salix lemmonii | Bebb | Salicaceae | 5 |
| Silene occidentalis | S.Watson | Caryophyllaceae | 5 |
| Sphaeralcea orcuttii | Rose | Malvaceae | 5 |
| Trichogalium muricatum | (W.Wight) Kadereit & Schneew. | Rubiaceae | 5 |
| Acmispon denticulatus | (Drew) D.D.Sokoloff | Fabaceae | 4 |
| Acmispon procumbens | (Greene) Brouillet | Fabaceae | 4 |
| Allium sharsmithiae | (Ownbey & Aase ex Traub) McNeal | Amaryllidaceae | 4 |
| Arceuthobium cyanocarpum | (A.Nelson ex Rydb.) J.M.Coult. & A.Nelson | Santalaceae | 4 |
| Arctostaphylos confertiflora | Eastw. | Ericaceae | 4 |
| Arctostaphylos viridissima | (Eastw.) McMinn | Ericaceae | 4 |
| Astragalus bernardinus | M.E.Jones | Fabaceae | 4 |
| Astragalus ertterae | Barneby & Shevock | Fabaceae | 4 |
| Brodiaea californica | Lindl. ex Lem. | Asparagaceae | 4 |
| Brodiaea insignis | (Jeps.) T.F.Niehaus | Asparagaceae | 4 |
| Bromus maritimus | (Piper) Hitchc. | Poaceae | 4 |
| Calochortus persistens | Ownbey | Liliaceae | 4 |
| Calycadenia fremontii | A.Gray | Asteraceae | 4 |
| Carex abrupta | Mack. | Cyperaceae | 4 |
| Carex sartwelliana | Olney | Cyperaceae | 4 |
| Carex subbracteata | Mack. | Cyperaceae | 4 |
| Carex tompkinsii | J.T.Howell | Cyperaceae | 4 |
| Ceanothus confusus | J.T.Howell | Rhamnaceae | 4 |
| Chrysothamnus humilis | Greene | Asteraceae | 4 |
| Cleomella brevipes | S.Watson | Cleomaceae | 4 |
| Cordylanthus kingii | S.Watson | Orobanchaceae | 4 |
| Cuscuta psorothamnensis | Stefanović, M.A.García & Costea | Convolvulaceae | 4 |
| Delphinium depauperatum | Nutt. | Ranunculaceae | 4 |
| Diplacus aridus | Abrams | Phrymaceae | 4 |
| Diplacus thompsonii | G.L.Nesom | Phrymaceae | 4 |
| Draba asterophora | Payson | Brassicaceae | 4 |
| Draba incrassata | (Rollins) Rollins & R.A.Price | Brassicaceae | 4 |
| Draba pterosperma | Payson | Brassicaceae | 4 |
| Epilobium septentrionale | (Keck) R.N.Bowman & Hoch | Onagraceae | 4 |
| Eriogonum inerme | (S.Watson) Jeps. | Polygonaceae | 4 |
| Eriogonum pendulum | S.Watson | Polygonaceae | 4 |
| Eriogonum twisselmannii | (J.T.Howell) Reveal | Polygonaceae | 4 |
| Eryngium castrense | Jeps. | Apiaceae | 4 |
| Erythranthe gracilipes | (B.L.Rob.) N.S.Fraga | Phrymaceae | 4 |
| Erythronium pluriflorum | Shevock, Bartel & G.A.Allen | Liliaceae | 4 |
| Eucnide rupestris | (Baill.) H.J.Thomps. & W.R.Ernst | Loasaceae | 4 |
| Gilia latimeri | (T.L.Weese & L.A.Johnson) V.E.Grant | Polemoniaceae | 4 |
| Gilia salticola | Eastw. | Polemoniaceae | 4 |
| Hackelia bella | I.M.Johnst. | Boraginaceae | 4 |
| Hackelia sharsmithii | I.M.Johnst. | Boraginaceae | 4 |
| Heteranthera rotundifolia | (Kunth) Griseb. | Pontederiaceae | 4 |
| Juncus bryoides | F.J.Herm. | Juncaceae | 4 |
| Juncus covillei | Piper | Juncaceae | 4 |
| Juncus laccatus | P.F.Zika | Juncaceae | 4 |
| Lasthenia debilis | (Greene ex A.Gray) Ornduff | Asteraceae | 4 |
| Lepidium dictyotum | A.Gray | Brassicaceae | 4 |
| Lepidium ramosissimum | A.Nelson | Brassicaceae | 4 |
| Leptosiphon harknessii | (Curran) J.M.Porter & L.A.Johnson | Polemoniaceae | 4 |
| Lilium occidentale | Purdy | Liliaceae | 4 |
| Lupinus andersonii | S.Watson | Fabaceae | 4 |
| Lupinus elmeri | Greene | Fabaceae | 4 |
| Lupinus nipomensis | Eastw. | Fabaceae | 4 |
| Malacothamnus jonesii | (Munz) Kearney | Malvaceae | 4 |
| Monardella beneolens | Shevock, Ertter & Jokerst | Lamiaceae | 4 |
| Monardella undulata | Benth. | Lamiaceae | 4 |
| Montia diffusa | (Nutt.) Greene | Montiaceae | 4 |
| Myrica hartwegii | S.Watson | Myricaceae | 4 |
| Navarretia prostrata | (A.Gray) Greene | Polemoniaceae | 4 |
| Nemacladus capillaris | Greene | Campanulaceae | 4 |
| Oenothera longissima | Rydb. | Onagraceae | 4 |
| Packera bernardina | (Greene) W.A.Weber & Á.Löve | Asteraceae | 4 |
| Packera bolanderi | (A.Gray) W.A.Weber & Á.Löve | Asteraceae | 4 |
| Pectocarya peninsularis | I.M.Johnst. | Boraginaceae | 4 |
| Perityle villosa | (S.F.Blake) Shinners | Asteraceae | 4 |
| Phacelia anelsonii | J.F.Macbr. | Hydrophyllaceae | 4 |
| Phacelia congdonii | Greene | Hydrophyllaceae | 4 |
| Phlox caespitosa | Nutt. | Polemoniaceae | 4 |
| Plagiobothrys leptocladus | (Greene) I.M.Johnst. | Boraginaceae | 4 |
| Plagiobothrys scriptus | (Greene) I.M.Johnst. | Boraginaceae | 4 |
| Plagiobothrys strictus | (Greene) I.M.Johnst. | Boraginaceae | 4 |
| Podagrostis humilis | (Vasey) Björkman | Poaceae | 4 |
| Pogogyne floribunda | Jokerst | Lamiaceae | 4 |
| Polygonum bidwelliae | S.Watson | Polygonaceae | 4 |
| Potentilla longibracteata | (Ertter) Mosyakin & Shiyan | Rosaceae | 4 |
| Potentilla pickeringii | (Torr. ex A.Gray) Greene | Rosaceae | 4 |
| Pseudobahia bahiifolia | Rydb. | Asteraceae | 4 |
| Pyrrocoma lucida | (D.D.Keck) Kartesz & Gandhi | Asteraceae | 4 |
| Pyrrocoma racemosa | Torr. & A.Gray | Asteraceae | 4 |
| Ribes lasianthum | Greene | Grossulariaceae | 4 |
| Ribes thacherianum | (Jeps.) Munz | Grossulariaceae | 4 |
| Rumex lacustris | Greene | Polygonaceae | 4 |
| Salix delnortensis | C.K.Schneid. | Salicaceae | 4 |
| Scrophularia villosa | Pennell | Scrophulariaceae | 4 |
| Sidotheca caryophylloides | (Parry) Reveal | Polygonaceae | 4 |
| Silene grayi | S.Watson | Caryophyllaceae | 4 |
| Silene suksdorfii | B.L.Rob. | Caryophyllaceae | 4 |
| Stellaria calycantha | (Ledeb.) Bong. | Caryophyllaceae | 4 |
| Streptanthus fenestratus | (Greene) J.T.Howell | Brassicaceae | 4 |
| Stylocline intertexta | Morefield | Asteraceae | 4 |
| Suaeda esteroa | Ferren & S.A.Whitmore | Chenopodiaceae | 4 |
| Thorneochloa diegoensis | (Swallen) Romasch. | Poaceae | 4 |
| Trichostema ovatum | Curran | Lamiaceae | 4 |
| Acmispon argyraeus | (Greene) Brouillet | Fabaceae | 3 |
| Agnorhiza invenusta | (Greene) W.A.Weber | Asteraceae | 3 |
| Agrostis variabilis | Rydb. | Poaceae | 3 |
| Allium membranaceum | Ownbey ex Traub | Amaryllidaceae | 3 |
| Astragalus claranus | Jeps. | Fabaceae | 3 |
| Astragalus clevelandii | Greene | Fabaceae | 3 |
| Astragalus insularis | Kellogg | Fabaceae | 3 |
| Astragalus inversus | M.E.Jones | Fabaceae | 3 |
| Boechera serpenticola | Windham & Al-Shehbaz | Brassicaceae | 3 |
| Boechera suffrutescens | (S.Watson) Dorn | Brassicaceae | 3 |
| Boechera tularensis | Windham & Al-Shehbaz | Brassicaceae | 3 |
| Botrychium tunux | Stensvold & Farrar | Ophioglossaceae | 3 |
| Brodiaea pallida | Hoover | Asparagaceae | 3 |
| Calamagrostis bolanderi | Thurb. | Poaceae | 3 |
| Calycadenia micrantha | R.L.Carr & G.D.Carr | Asteraceae | 3 |
| Camissonia kernensis | (Munz) P.H.Raven | Onagraceae | 3 |
| Carex scopulorum | Holm | Cyperaceae | 3 |
| Ceanothus sonomensis | J.T.Howell | Rhamnaceae | 3 |
| Ceratopteris thalictroides | (L.) Brongn. | Pteridaceae | 3 |
| Chenopodium desiccatum | A.Nelson | Chenopodiaceae | 3 |
| Chloropyron tecopense | (Munz & J.C.Roos) Tank & J.M.Egger | Orobanchaceae | 3 |
| Chorizanthe wheeleri | S.Watson | Polygonaceae | 3 |
| Cirsium inamoenum | (Greene) D.J.Keil | Asteraceae | 3 |
| Clarkia mildrediae | (A.Heller) F.H.Lewis & M.E.Lewis | Onagraceae | 3 |
| Clarkia springvillensis | Vasek | Onagraceae | 3 |
| Crepis pleurocarpa | A.Gray | Asteraceae | 3 |
| Cryptantha decipiens | (M.E.Jones) A.Heller | Boraginaceae | 3 |
| Cryptantha torreyana | (A.Gray) Greene | Boraginaceae | 3 |
| Downingia laeta | (Greene) Greene | Campanulaceae | 3 |
| Erigeron clokeyi | Cronquist | Asteraceae | 3 |
| Erigeron lobatus | A.Nelson | Asteraceae | 3 |
| Eriogonum ampullaceum | J.T.Howell | Polygonaceae | 3 |
| Eriogonum apiculatum | S.Watson | Polygonaceae | 3 |
| Eriogonum molestum | S.Watson | Polygonaceae | 3 |
| Eriogonum ternatum | Howell | Polygonaceae | 3 |
| Eriophyllum congdonii | Brandegee | Asteraceae | 3 |
| Eryngium constancei | M.Y.Sheikh | Apiaceae | 3 |
| Erysimum ammophilum | A.Heller | Brassicaceae | 3 |
| Erythranthe latidens | (A.Gray) G.L.Nesom | Phrymaceae | 3 |
| Erythranthe sierrae | N.S.Fraga | Phrymaceae | 3 |
| Festuca minutiflora | Rydb. | Poaceae | 3 |
| Galium hypotrichium | A.Gray | Rubiaceae | 3 |
| Gentianella amarella | (L.) Börner | Gentianaceae | 3 |
| Githopsis pulchella | Vatke | Campanulaceae | 3 |
| Glyptopleura setulosa | A.Gray | Asteraceae | 3 |
| Grindelia fraxinipratensis | Reveal & Beatley | Asteraceae | 3 |
| Holmgrenanthe petrophila | (Coville & C.V.Morton) Elisens | Plantaginaceae | 3 |
| Ipomopsis effusa | (A.Gray) Moran | Polemoniaceae | 3 |
| Juncus textilis | Buchenau | Juncaceae | 3 |
| Lasthenia burkei | Greene | Asteraceae | 3 |
| Lathyrus rigidus | T.G.White | Fabaceae | 3 |
| Limnanthes vinculans | Ornduff | Limnanthaceae | 3 |
| Linanthus jaegeri | (Munz) J.M.Porter & L.A.Johnson | Polemoniaceae | 3 |
| Linum clevelandii | Greene | Linaceae | 3 |
| Lithophragma maximum | Bacig. | Saxifragaceae | 3 |
| Lomatium peckianum | Mathias & Constance | Apiaceae | 3 |
| Lupinus onustus | S.Watson | Fabaceae | 3 |
| Marsilea oligospora | Goodd. | Marsileaceae | 3 |
| Monardella palmeri | A.Gray | Lamiaceae | 3 |
| Monoptilon bellidiforme | Torr. & A.Gray | Asteraceae | 3 |
| Muhlenbergia appressa | Goodd. | Poaceae | 3 |
| Muhlenbergia pauciflora | Buckley | Poaceae | 3 |
| Navarretia paradoxiclara | L.A.Johnson & D.Gowen | Polemoniaceae | 3 |
| Oxypolis occidentalis | J.M.Coult. & Rose | Apiaceae | 3 |
| Packera subnuda | (DC.) Trock & T.M.Barkley | Asteraceae | 3 |
| Panicum urvilleanum | Kunth | Poaceae | 3 |
| Phacelia geraniifolia | Brand | Hydrophyllaceae | 3 |
| Phacelia orogenes | Brand | Hydrophyllaceae | 3 |
| Phalacroseris bolanderi | A.Gray | Asteraceae | 3 |
| Phlox dispersa | Sharsm. | Polemoniaceae | 3 |
| Poa thomasii | Refulio | Poaceae | 3 |
| Polygonum bolanderi | W.H.Brewer | Polygonaceae | 3 |
| Potentilla amicarum | Ertter | Rosaceae | 3 |
| Potentilla jepsonii | Ertter | Rosaceae | 3 |
| Potentilla shockleyi | (S.Watson) Jeps. | Rosaceae | 3 |
| Pycnanthemum californicum | Torr. ex Durand | Lamiaceae | 3 |
| Pyrrocoma lanceolata | (Hook.) Greene | Asteraceae | 3 |
| Pyrrocoma uniflora | (Hook.) Greene | Asteraceae | 3 |
| Ranunculus cupulatus | (S.Watson) Christenh. & Byng | Ranunculaceae | 3 |
| Rupertia rigida | (Parish) J.W.Grimes | Fabaceae | 3 |
| Sairocarpus virga | (A.Gray) D.A.Sutton | Plantaginaceae | 3 |
| Salix prolixa | Andersson | Salicaceae | 3 |
| Sambucus mexicana | C.Presl ex DC. | Viburnaceae | 3 |
| Selaginella asprella | Maxon | Selaginellaceae | 3 |
| Stachys stricta | Greene | Lamiaceae | 3 |
| Stephanomeria paniculata | Nutt. | Asteraceae | 3 |
| Streptanthus gracilis | Eastw. | Brassicaceae | 3 |
| Streptanthus hammittii | (S.Boyd & T.S.Ross) Al-Shehbaz | Brassicaceae | 3 |
| Symphyotrichum lentum | (Greene) G.L.Nesom | Asteraceae | 3 |
| Thelypodium brachycarpum | Torr. | Brassicaceae | 3 |
| Thelypodium flexuosum | B.L.Rob. | Brassicaceae | 3 |
| Trichogalium bolanderi | (A.Gray) Kadereit & Schneew. | Rubiaceae | 3 |
| Trichophorum clementis | (M.E.Jones) S.G.Sm. | Cyperaceae | 3 |
| Trifolium columbinum | Greene | Fabaceae | 3 |