| Abies concolor | (Gordon) Lindl. ex Hildebr. | Pinaceae | 8 |
| Abies lasiocarpa | (Hook.) Nutt. | Pinaceae | 8 |
| Abies magnifica | A.Murray bis | Pinaceae | 8 |
| Abronia crux-maltae | Kellogg | Nyctaginaceae | 8 |
| Abronia elliptica | A.Nelson | Nyctaginaceae | 8 |
| Abronia micrantha | Torr. | Nyctaginaceae | 8 |
| Abronia nana | S.Watson | Nyctaginaceae | 8 |
| Abronia turbinata | Torr. ex S.Watson | Nyctaginaceae | 8 |
| Abronia villosa | S.Watson | Nyctaginaceae | 8 |
| Abutilon parvulum | A.Gray | Malvaceae | 8 |
| Acamptopappus shockleyi | A.Gray | Asteraceae | 8 |
| Acamptopappus sphaerocephalus | A.Gray | Asteraceae | 8 |
| Acer glabrum | Torr. | Sapindaceae | 8 |
| Acer negundo | L. | Sapindaceae | 8 |
| Acer saccharum | Marshall | Sapindaceae | 8 |
| Achillea millefolium | L. | Asteraceae | 8 |
| Achyronychia cooperi | A.Gray | Caryophyllaceae | 8 |
| Acleisanthes nevadensis | (Standl.) B.L.Turner | Nyctaginaceae | 8 |
| Acmispon brachycarpus | (Benth.) D.D.Sokoloff | Fabaceae | 8 |
| Acmispon decumbens | (Benth.) Govaerts | Fabaceae | 8 |
| Acmispon maritimus | (Nutt.) D.D.Sokoloff | Fabaceae | 8 |
| Acmispon oroboides | (Kunth) Brouillet | Fabaceae | 8 |
| Acmispon parviflorus | (Benth.) D.D.Sokoloff | Fabaceae | 8 |
| Acmispon rigidus | (Benth.) Brouillet | Fabaceae | 8 |
| Acmispon strigosus | (Nutt.) Brouillet | Fabaceae | 8 |
| Acmispon utahensis | (Ottley) Brouillet | Fabaceae | 8 |
| Aconitum columbianum | Nutt. | Ranunculaceae | 8 |
| Acourtia wrightii | (A.Gray) Reveal & R.M.King | Asteraceae | 8 |
| Actaea rubra | (Aiton) Willd. | Ranunculaceae | 8 |
| Adenophyllum cooperi | (A.Gray) Strother | Asteraceae | 8 |
| Adenophyllum porophylloides | (A.Gray) Strother | Asteraceae | 8 |
| Adiantum aleuticum | (Rupr.) C.A.Paris | Pteridaceae | 8 |
| Adiantum capillus-veneris | L. | Pteridaceae | 8 |
| Adiaphila brickellioides | (S.F.Blake) G.L.Nesom | Asteraceae | 8 |
| Agastache urticifolia | (Benth.) Kuntze | Lamiaceae | 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 |
| 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 retrorsa | Greene | Asteraceae | 8 |
| Agrimonia striata | Michx. | Rosaceae | 8 |
| Agrostis pallens | Trin. | Poaceae | 8 |
| Agrostis scabra | Willd. | Poaceae | 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 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 acuminatum | Hook. | Amaryllidaceae | 8 |
| Allium anceps | Kellogg | Amaryllidaceae | 8 |
| Allium bisceptrum | S.Watson | Amaryllidaceae | 8 |
| Allium brandegeei | S.Watson | Amaryllidaceae | 8 |
| Allium campanulatum | S.Watson | Amaryllidaceae | 8 |
| Allium geyeri | S.Watson | Amaryllidaceae | 8 |
| Allium lemmonii | S.Watson | Amaryllidaceae | 8 |
| Allium nevadense | S.Watson | Amaryllidaceae | 8 |
| Allium obtusum | Lemmon | Amaryllidaceae | 8 |
| Allium parvum | Kellogg | Amaryllidaceae | 8 |
| Allium platycaule | S.Watson | Amaryllidaceae | 8 |
| Allium textile | A.Nelson & J.F.Macbr. | Amaryllidaceae | 8 |
| Allium validum | S.Watson | Amaryllidaceae | 8 |
| Allophyllum gilioides | (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 incana | (L.) Moench | Betulaceae | 8 |
| Alopecurus aequalis | Sobol. | Poaceae | 8 |
| Amaranthus albus | L. | Amaranthaceae | 8 |
| Amaranthus palmeri | S.Watson | Amaranthaceae | 8 |
| Amaranthus powellii | S.Watson | Amaranthaceae | 8 |
| Ambrosia acanthicarpa | Hook. | Asteraceae | 8 |
| Ambrosia artemisiifolia | L. | Asteraceae | 8 |
| Ambrosia dumosa | (A.Gray) W.W.Payne | Asteraceae | 8 |
| Ambrosia eriocentra | (A.Gray) W.W.Payne | Asteraceae | 8 |
| Ambrosia psilostachya | DC. | Asteraceae | 8 |
| Amelanchier alnifolia | (Nutt.) Nutt. ex M.Roem. | Rosaceae | 8 |
| Amelanchier utahensis | Koehne | Rosaceae | 8 |
| Ammannia robusta | Heer & Regel | Lythraceae | 8 |
| Amphipappus fremontii | Torr. & A.Gray | Asteraceae | 8 |
| Amphiscirpus nevadensis | (S.Watson) Oteng-Yeb. | Cyperaceae | 8 |
| Amsinckia menziesii | (Lehm.) A.Nelson & J.F.Macbr. | Boraginaceae | 8 |
| Amsinckia tessellata | A.Gray | Boraginaceae | 8 |
| Amsonia tabernaemontana | Walter | Apocynaceae | 8 |
| Amsonia tomentosa | Torr. & Frém. | Apocynaceae | 8 |
| Anaphalis margaritacea | (L.) Benth. & Hook.f. | Asteraceae | 8 |
| Ancistrocarphus filagineus | A.Gray | Asteraceae | 8 |
| Androsace elongata | L. | Primulaceae | 8 |
| Androsace septentrionalis | L. | Primulaceae | 8 |
| Androstephium breviflorum | S.Watson | Asparagaceae | 8 |
| Anelsonia eurycarpa | (A.Gray) J.F.Macbr. & Payson | Brassicaceae | 8 |
| Anemone multifida | Poir. | Ranunculaceae | 8 |
| Anemone tuberosa | Rydb. | Ranunculaceae | 8 |
| Anemopsis californica | (Nutt.) Hook. & Arn. | Saururaceae | 8 |
| Angelica arguta | Nutt. | Apiaceae | 8 |
| Angelica breweri | A.Gray | Apiaceae | 8 |
| Angelica capitellata | (A.Gray) Spalik, Reduron & S.R.Downie | Apiaceae | 8 |
| Angelica kingii | (S.Watson) J.M.Coult. & Rose | Apiaceae | 8 |
| Angelica lineariloba | A.Gray | Apiaceae | 8 |
| Anisacanthus thurberi | (Torr.) A.Gray | Acanthaceae | 8 |
| Anisocoma acaulis | Torr. & A.Gray | Asteraceae | 8 |
| Antennaria anaphaloides | Rydb. | Asteraceae | 8 |
| Antennaria argentea | Benth. | Asteraceae | 8 |
| Antennaria dimorpha | Torr. & A.Gray | Asteraceae | 8 |
| Antennaria geyeri | A.Gray | Asteraceae | 8 |
| Antennaria luzuloides | Torr. & A.Gray | Asteraceae | 8 |
| Antennaria media | Greene | Asteraceae | 8 |
| Antennaria microphylla | Rydb. | Asteraceae | 8 |
| Antennaria parvifolia | Nutt. | Asteraceae | 8 |
| Antennaria pulchella | Greene | Asteraceae | 8 |
| Antennaria rosea | Greene | Asteraceae | 8 |
| Antennaria stenophylla | (A.Gray) A.Gray | Asteraceae | 8 |
| Antennaria umbrinella | Rydb. | Asteraceae | 8 |
| Anthoxanthum nitens | (Weber) Y.Schouten & Veldkamp | Poaceae | 8 |
| Anticlea elegans | (Pursh) Rydb. | Melanthiaceae | 8 |
| Apocynum androsaemifolium | L. | Apocynaceae | 8 |
| Apocynum cannabinum | L. | Apocynaceae | 8 |
| Aquilegia coerulea | E.James | Ranunculaceae | 8 |
| Aquilegia formosa | Fisch. ex DC. | Ranunculaceae | 8 |
| Aquilegia scopulorum | Tidestr. | Ranunculaceae | 8 |
| Aquilegia shockleyi | Eastw. | Ranunculaceae | 8 |
| Arabis eschscholtziana | Andrz. ex Ledeb. | Brassicaceae | 8 |
| Arceuthobium americanum | Nutt. ex Engelm. | Santalaceae | 8 |
| Arceuthobium divaricatum | Engelm. | Santalaceae | 8 |
| Arceuthobium douglasii | Engelm. | Santalaceae | 8 |
| Arctomecon merriamii | Coville | Papaveraceae | 8 |
| Arctostaphylos patula | Greene | Ericaceae | 8 |
| Arctostaphylos pringlei | Parry | Ericaceae | 8 |
| Arctostaphylos pungens | Kunth | Ericaceae | 8 |
| Arctostaphylos uva-ursi | (L.) Spreng. | Ericaceae | 8 |
| Arenaria lanuginosa | (Michx.) Rohrb. | Caryophyllaceae | 8 |
| Argemone munita | Durand & Hilg. | Papaveraceae | 8 |
| Argentina anserina | (L.) Rydb. | Rosaceae | 8 |
| Argyrochosma jonesii | (Maxon) Windham | Pteridaceae | 8 |
| Aristida adscensionis | L. | Poaceae | 8 |
| Aristida arizonica | Vasey | Poaceae | 8 |
| Aristida purpurea | Nutt. | Poaceae | 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 longifolia | D.C.Eaton | Asteraceae | 8 |
| Arnica mollis | Hook. | Asteraceae | 8 |
| Arnica parryi | A.Gray | Asteraceae | 8 |
| Arnica sororia | Greene | 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 campestris | L. | Asteraceae | 8 |
| Artemisia cana | Pursh | Asteraceae | 8 |
| Artemisia douglasiana | Besser | Asteraceae | 8 |
| Artemisia dracunculus | L. | Asteraceae | 8 |
| Artemisia filifolia | Torr. | Asteraceae | 8 |
| Artemisia ludoviciana | Nutt. | Asteraceae | 8 |
| Artemisia michauxiana | Besser | Asteraceae | 8 |
| Artemisia nova | A.Nelson | Asteraceae | 8 |
| Artemisia nuttallii | (Torr. & A.Gray) Mosyakin, L.M.Shultz & G.V.Boiko | Asteraceae | 8 |
| Artemisia pygmaea | A.Gray | Asteraceae | 8 |
| Artemisia scopulorum | A.Gray | Asteraceae | 8 |
| Artemisia spiciformis | Osterh. | Asteraceae | 8 |
| Artemisia tridentata | Nutt. | Asteraceae | 8 |
| Artemisia tripartita | Rydb. | Asteraceae | 8 |
| Asclepias asperula | (Decne.) Woodson | Apocynaceae | 8 |
| Asclepias cordifolia | (Benth.) Jeps. | Apocynaceae | 8 |
| Asclepias cryptoceras | S.Watson | Apocynaceae | 8 |
| Asclepias erosa | Torr. | Apocynaceae | 8 |
| Asclepias fascicularis | Decne. | Apocynaceae | 8 |
| Asclepias hallii | A.Gray | Apocynaceae | 8 |
| Asclepias incarnata | L. | Apocynaceae | 8 |
| Asclepias nyctaginifolia | A.Gray | Apocynaceae | 8 |
| Asclepias rusbyi | (Vail) Woodson | Apocynaceae | 8 |
| Asclepias speciosa | Torr. | Apocynaceae | 8 |
| Asclepias subulata | Decne. | Apocynaceae | 8 |
| Askellia pygmaea | (Ledeb.) Sennikov | Asteraceae | 8 |
| Aspidotis densa | (Brack.) Lellinger | Pteridaceae | 8 |
| Asplenium resiliens | Kunze | Aspleniaceae | 8 |
| Asplenium viride | Huds. | Aspleniaceae | 8 |
| Astragalus acutirostris | S.Watson | Fabaceae | 8 |
| Astragalus agrestis | Douglas ex G.Don | Fabaceae | 8 |
| Astragalus alpinus | L. | Fabaceae | 8 |
| Astragalus amphioxys | A.Gray | Fabaceae | 8 |
| Astragalus andersonii | A.Gray | Fabaceae | 8 |
| Astragalus atratus | S.Watson | Fabaceae | 8 |
| Astragalus austiniae | A.Gray ex W.H.Brewer & S.Watson | Fabaceae | 8 |
| Astragalus beckwithii | Torr. & A.Gray | Fabaceae | 8 |
| Astragalus bisulcatus | (Hook.) A.Gray | Fabaceae | 8 |
| Astragalus bolanderi | A.Gray | Fabaceae | 8 |
| Astragalus calycosus | Torr. ex S.Watson | Fabaceae | 8 |
| Astragalus canadensis | L. | Fabaceae | 8 |
| Astragalus casei | A.Gray | Fabaceae | 8 |
| Astragalus ceramicus | E.Sheld. | Fabaceae | 8 |
| Astragalus cibarius | E.Sheld. | Fabaceae | 8 |
| Astragalus coccineus | (Parry) Brandegee | Fabaceae | 8 |
| Astragalus convallarius | Greene | Fabaceae | 8 |
| Astragalus curvicarpus | (E.Sheld.) J.F.Macbr. | Fabaceae | 8 |
| Astragalus didymocarpus | Hook. & Arn. | Fabaceae | 8 |
| Astragalus eremiticus | E.Sheld. | Fabaceae | 8 |
| Astragalus filipes | Torr. ex A.Gray | Fabaceae | 8 |
| Astragalus flavus | Nutt. | Fabaceae | 8 |
| Astragalus gibbsii | Kellogg | Fabaceae | 8 |
| Astragalus gilmanii | Tidestr. | Fabaceae | 8 |
| Astragalus humistratus | A.Gray | 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 lonchocarpus | Torr. | Fabaceae | 8 |
| Astragalus malacus | A.Gray | Fabaceae | 8 |
| Astragalus megacarpus | (Nutt.) A.Gray | Fabaceae | 8 |
| Astragalus minthorniae | (Rydb.) Jeps. | Fabaceae | 8 |
| Astragalus miser | Douglas ex Hook. | Fabaceae | 8 |
| Astragalus mohavensis | S.Watson | Fabaceae | 8 |
| Astragalus mollissimus | Torr. | Fabaceae | 8 |
| Astragalus multiflorus | (Pursh) A.Gray | Fabaceae | 8 |
| Astragalus newberryi | A.Gray | Fabaceae | 8 |
| Astragalus nuttallianus | DC. | Fabaceae | 8 |
| Astragalus obscurus | S.Watson | Fabaceae | 8 |
| Astragalus oophorus | S.Watson | Fabaceae | 8 |
| Astragalus phoenix | Barneby | Fabaceae | 8 |
| Astragalus piutensis | Barneby & Mabb. | Fabaceae | 8 |
| Astragalus platytropis | A.Gray | Fabaceae | 8 |
| Astragalus praelongus | E.Sheld. | Fabaceae | 8 |
| Astragalus preussii | A.Gray | Fabaceae | 8 |
| Astragalus purshii | Douglas ex G.Don | Fabaceae | 8 |
| Astragalus remotus | (M.E.Jones) Barneby | Fabaceae | 8 |
| Astragalus robbinsii | (Oakes) A.Gray | Fabaceae | 8 |
| Astragalus sabulonum | A.Gray | Fabaceae | 8 |
| Astragalus salmonis | M.E.Jones | Fabaceae | 8 |
| Astragalus serenoi | (Kuntze) E.Sheld. | Fabaceae | 8 |
| Astragalus solitarius | M.Peck | Fabaceae | 8 |
| Astragalus tephrodes | A.Gray | Fabaceae | 8 |
| Astragalus tidestromii | (Rydb.) Clokey | Fabaceae | 8 |
| Astragalus utahensis | (Torr.) Torr. & A.Gray | Fabaceae | 8 |
| Astragalus whitneyi | A.Gray | Fabaceae | 8 |
| Astragalus zionis | M.E.Jones | Fabaceae | 8 |
| Astrolepis integerrima | (Hook.) 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 canescens | (Pursh) Nutt. | Chenopodiaceae | 8 |
| Atriplex confertifolia | (Torr. & Frém.) S.Watson | Chenopodiaceae | 8 |
| Atriplex elegans | (Moq.) D.Dietr. | Chenopodiaceae | 8 |
| Atriplex hymenelytra | (Torr.) S.Watson | Chenopodiaceae | 8 |
| Atriplex lentiformis | (Torr.) 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 |
| Azolla filiculoides | Lam. | Salviniaceae | 8 |
| Baccharis brachyphylla | A.Gray | Asteraceae | 8 |
| Baccharis salicifolia | (Ruiz & Pav.) Pers. | Asteraceae | 8 |
| Baccharis salicina | Torr. & A.Gray | Asteraceae | 8 |
| Baccharis sergiloides | A.Gray | Asteraceae | 8 |
| Baileya pleniradiata | Harv. & A.Gray | Asteraceae | 8 |
| Balsamorhiza hookeri | Nutt. | Asteraceae | 8 |
| Balsamorhiza macrolepis | W.M.Sharp | Asteraceae | 8 |
| Balsamorhiza serrata | A.Nelson & J.F.Macbr. | Asteraceae | 8 |
| Barbarea orthoceras | Ledeb. | Brassicaceae | 8 |
| Bebbia juncea | Greene | Asteraceae | 8 |
| Beckmannia syzigachne | (Steud.) Fernald | Poaceae | 8 |
| Berberis fremontii | Torr. | Berberidaceae | 8 |
| Berberis haematocarpa | Wooton | Berberidaceae | 8 |
| Berberis repens | Lindl. | Berberidaceae | 8 |
| Berula erecta | (Huds.) Coville | Apiaceae | 8 |
| Betula occidentalis | Hook. | Betulaceae | 8 |
| Bidens cernua | L. | Asteraceae | 8 |
| Bidens frondosa | L. | Asteraceae | 8 |
| Bidens laevis | (L.) Britton, Sterns & Poggenb. | Asteraceae | 8 |
| Bidens vulgata | Greene | Asteraceae | 8 |
| Blepharidachne kingii | (S.Watson) Hack. | Poaceae | 8 |
| Blepharipappus scaber | Hook. | Asteraceae | 8 |
| Blitum capitatum | L. | Chenopodiaceae | 8 |
| Blitum nuttallianum | Schult. | Chenopodiaceae | 8 |
| Boechera angustifolia | (Nutt.) Dorn | Brassicaceae | 8 |
| Boechera bodiensis | (Rollins) 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 lemmonii | (S.Watson) W.A.Weber | Brassicaceae | 8 |
| Boechera lyallii | (S.Watson) Dorn | Brassicaceae | 8 |
| Boechera nevadensis | (Tidestr.) Windham & 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 puberula | (Nutt.) Dorn | Brassicaceae | 8 |
| Boechera pulchra | (M.E.Jones ex S.Watson) W.A.Weber | 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 triquetra | S.Watson | Nyctaginaceae | 8 |
| Boerhavia wrightii | A.Gray | Nyctaginaceae | 8 |
| Bolboschoenus maritimus | (L.) Palla | 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 minganense | Vict. | 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 dactyloides | (Nutt.) Columbus | Poaceae | 8 |
| Bouteloua eriopoda | (Torr.) Torr. | Poaceae | 8 |
| Bouteloua gracilis | (Kunth) Lag. ex Griffiths | Poaceae | 8 |
| Bouteloua hirsuta | Lag. | Poaceae | 8 |
| Bouteloua trifida | Thurb. ex S.Watson | Poaceae | 8 |
| Brewerimitella breweri | (A.Gray) 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 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 |
| Bromus laevipes | Shear | Poaceae | 8 |
| Bromus porteri | (Coult.) Nash | Poaceae | 8 |
| Bromus vulgaris | (Hook.) Shear | Poaceae | 8 |
| Buddleja utahensis | Coville | Scrophulariaceae | 8 |
| Calamagrostis canadensis | (Michx.) P.Beauv. | Poaceae | 8 |
| Calamagrostis inexpansa | A.Gray | Poaceae | 8 |
| Calamagrostis purpurascens | R.Br. | Poaceae | 8 |
| Calamagrostis rubescens | Buckley | Poaceae | 8 |
| Calamagrostis stricta | (Timm) Koeler | Poaceae | 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 |
| Callitriche heterophylla | Pursh | Plantaginaceae | 8 |
| Callitriche palustris | L. | Plantaginaceae | 8 |
| Calochortus bruneaunis | A.Nelson & J.F.Macbr. | Liliaceae | 8 |
| Calochortus eurycarpus | S.Watson | 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 macrocarpus | Douglas | Liliaceae | 8 |
| Calochortus nuttallii | Torr. | Liliaceae | 8 |
| Calochortus striatus | Parish | Liliaceae | 8 |
| Caltha biflora | DC. | Ranunculaceae | 8 |
| Caltha chionophila | Greene | Ranunculaceae | 8 |
| Calycoseris parryi | A.Gray | Asteraceae | 8 |
| Calycoseris wrightii | A.Gray | Asteraceae | 8 |
| Calystegia longipes | (S.Watson) Brummitt | Convolvulaceae | 8 |
| Calystegia sepium | (L.) R.Br. | Convolvulaceae | 8 |
| Camassia quamash | (Pursh) Greene | Asparagaceae | 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 |
| Camissoniopsis pallida | (Abrams) W.L.Wagner & Hoch | Onagraceae | 8 |
| Cardamine breweri | S.Watson | Brassicaceae | 8 |
| Cardamine cordifolia | A.Gray | Brassicaceae | 8 |
| Cardamine oligosperma | Nutt. | Brassicaceae | 8 |
| Cardamine pensylvanica | Muhl. ex Willd. | Brassicaceae | 8 |
| Carex alascana | Boeckeler | Cyperaceae | 8 |
| Carex aquatilis | Wahlenb. | Cyperaceae | 8 |
| Carex atherodes | Spreng. | Cyperaceae | 8 |
| Carex athrostachya | Olney | Cyperaceae | 8 |
| Carex aurea | Nutt. | Cyperaceae | 8 |
| Carex breweri | Boott | Cyperaceae | 8 |
| Carex canescens | L. | Cyperaceae | 8 |
| Carex capillaris | L. | Cyperaceae | 8 |
| Carex capitata | Sol. | Cyperaceae | 8 |
| Carex chalciolepis | Holm | 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 elynoides | Holm | Cyperaceae | 8 |
| Carex engelmannii | L.H.Bailey | Cyperaceae | 8 |
| Carex filifolia | Nutt. | Cyperaceae | 8 |
| Carex heteroneura | W.Boott | Cyperaceae | 8 |
| Carex hoodii | Boott | Cyperaceae | 8 |
| Carex illota | L.H.Bailey | Cyperaceae | 8 |
| Carex interior | L.H.Bailey | Cyperaceae | 8 |
| Carex leporina | L. | Cyperaceae | 8 |
| Carex limosa | L. | Cyperaceae | 8 |
| Carex luzulina | Olney | Cyperaceae | 8 |
| Carex micropoda | C.A.Mey. | Cyperaceae | 8 |
| Carex microptera | Mack. | Cyperaceae | 8 |
| Carex nardina | (Hornem.) Fr. | Cyperaceae | 8 |
| Carex nova | 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 raynoldsii | Dewey | Cyperaceae | 8 |
| Carex rossii | Boott | Cyperaceae | 8 |
| Carex scirpoidea | Michx. | Cyperaceae | 8 |
| Carex straminiformis | L.H.Bailey | Cyperaceae | 8 |
| Carex subfusca | W.Boott | Cyperaceae | 8 |
| Carex subnigricans | Stacey | Cyperaceae | 8 |
| Carex utriculata | Boott | Cyperaceae | 8 |
| Carex vallicola | Dewey | Cyperaceae | 8 |
| Carex whitneyi | Olney | Cyperaceae | 8 |
| Cassiope mertensiana | (Bong.) G.Don | Ericaceae | 8 |
| Castilleja angustifolia | (Nutt.) G.Don | Orobanchaceae | 8 |
| Castilleja applegatei | Fernald | Orobanchaceae | 8 |
| Castilleja arachnoidea | Greenm. | Orobanchaceae | 8 |
| Castilleja chromosa | A.Nelson | Orobanchaceae | 8 |
| Castilleja cusickii | Greenm. | Orobanchaceae | 8 |
| Castilleja flava | S.Watson | Orobanchaceae | 8 |
| Castilleja lemmonii | A.Gray | Orobanchaceae | 8 |
| Castilleja linariifolia | Benth. | Orobanchaceae | 8 |
| Castilleja martini | Abrams | Orobanchaceae | 8 |
| Castilleja miniata | Douglas ex Benth. | Orobanchaceae | 8 |
| Castilleja minor | (A.Gray) A.Gray | Orobanchaceae | 8 |
| Castilleja nana | Eastw. | Orobanchaceae | 8 |
| Castilleja pallescens | (A.Gray) Greenm. | Orobanchaceae | 8 |
| Castilleja peirsonii | Eastw. | Orobanchaceae | 8 |
| Castilleja pilosa | (S.Watson) Rydb. | Orobanchaceae | 8 |
| Castilleja scabrida | Eastw. | Orobanchaceae | 8 |
| Castilleja tenuis | (A.Heller) T.I.Chuang & Heckard | Orobanchaceae | 8 |
| Castilleja viscidula | A.Gray | Orobanchaceae | 8 |
| Catabrosa aquatica | (L.) P.Beauv. | Poaceae | 8 |
| Ceanothus cordulatus | Kellogg | Rhamnaceae | 8 |
| Ceanothus pauciflorus | DC. | Rhamnaceae | 8 |
| Ceanothus prostratus | Benth. | Rhamnaceae | 8 |
| Ceanothus velutinus | Douglas | Rhamnaceae | 8 |
| Celtis reticulata | Torr. | Cannabaceae | 8 |
| Cenchrus echinatus | L. | Poaceae | 8 |
| Cenchrus spinifex | Cav. | Poaceae | 8 |
| Centromadia pungens | Greene | Asteraceae | 8 |
| Cerastium beeringianum | Cham. & Schltdl. | Caryophyllaceae | 8 |
| Cerastium brachypodum | (Engelm. ex A.Gray) B.L.Rob. | Caryophyllaceae | 8 |
| Ceratophyllum demersum | L. | Ceratophyllaceae | 8 |
| Cercis orbiculata | Greene | Fabaceae | 8 |
| Cercocarpus intricatus | S.Watson | Rosaceae | 8 |
| Cercocarpus ledifolius | Nutt. | Rosaceae | 8 |
| Cercocarpus montanus | Raf. | Rosaceae | 8 |
| Chaenactis alpigena | Sharsm. | Asteraceae | 8 |
| Chaenactis carphoclinia | A.Gray | Asteraceae | 8 |
| Chaenactis douglasii | Hook. & Arn. | Asteraceae | 8 |
| Chaenactis fremontii | A.Gray | Asteraceae | 8 |
| Chaenactis macrantha | D.C.Eaton | Asteraceae | 8 |
| Chaenactis nevadensis | A.Gray | Asteraceae | 8 |
| Chaenactis stevioides | Hook. & Arn. | 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 |
| Chamaebatiaria millefolium | (Torr.) Maxim. | Rosaceae | 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 rubrum | L. | Chenopodiaceae | 8 |
| Cherleria biflora | (L.) A. J. Moore & Dillenb. | Caryophyllaceae | 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 |
| Chloropyron maritimum | (Nutt. ex Benth.) A.Heller | Orobanchaceae | 8 |
| Chorizanthe brevicornu | Torr. | Polygonaceae | 8 |
| Chorizanthe corrugata | (Torr.) Torr. & A.Gray | Polygonaceae | 8 |
| Chorizanthe rigida | (Torr.) Torr. & A.Gray | Polygonaceae | 8 |
| Chorizanthe watsonii | Torr. & A.Gray | Polygonaceae | 8 |
| Chrysothamnus depressus | Nutt. | Asteraceae | 8 |
| Chrysothamnus greenei | (A.Gray) Greene | Asteraceae | 8 |
| Chrysothamnus viscidiflorus | Nutt. | Asteraceae | 8 |
| Chylismia brevipes | (A.Gray) Small | Onagraceae | 8 |
| Chylismia claviformis | (Torr. & Frém.) A.Heller | Onagraceae | 8 |
| Chylismia heterochroma | (S.Watson) Small | Onagraceae | 8 |
| Chylismia scapoidea | (Torr. & A.Gray) Small | Onagraceae | 8 |
| Chylismia walkeri | A.Nelson | Onagraceae | 8 |
| Chylismiella pterosperma | (S.Watson) W.L.Wagner & Hoch | Onagraceae | 8 |
| Cicuta douglasii | J.M.Coult. & Rose | Apiaceae | 8 |
| Cicuta maculata | L. | Apiaceae | 8 |
| Cinna latifolia | (Trevir. ex Göpp.) Griseb. | Poaceae | 8 |
| Circaea alpina | L. | Onagraceae | 8 |
| Cirsium andersonii | Petr. | Asteraceae | 8 |
| Cirsium arizonicum | (A.Gray) Petr. | Asteraceae | 8 |
| Cirsium canescens | Nutt. | Asteraceae | 8 |
| Cirsium clokeyi | S.F.Blake | Asteraceae | 8 |
| Cirsium cymosum | (Greene) J.T.Howell | Asteraceae | 8 |
| Cirsium douglasii | DC. | Asteraceae | 8 |
| Cirsium eatonii | (A.Gray) B.L.Rob. | Asteraceae | 8 |
| Cirsium mohavense | (Greene) Petr. | Asteraceae | 8 |
| Cirsium neomexicanum | A.Gray | Asteraceae | 8 |
| Cirsium occidentale | (Nutt.) Jeps. | Asteraceae | 8 |
| Cirsium scariosum | Nutt. | Asteraceae | 8 |
| Cistanthe monandra | (Nutt.) Hershk. | Montiaceae | 8 |
| Cistanthe monosperma | (Greene) Hershk. | Montiaceae | 8 |
| Cistanthe rosea | (S.Watson) Hershk. | Montiaceae | 8 |
| Cistanthe umbellata | (Torr.) Hershk. | Montiaceae | 8 |
| Cladium mariscus | (L.) Pohl | Cyperaceae | 8 |
| Clarkia lassenensis | (Eastw.) F.H.Lewis & M.E.Lewis | Onagraceae | 8 |
| Clarkia rhomboidea | Douglas | Onagraceae | 8 |
| Claytonia cordifolia | S.Watson | Montiaceae | 8 |
| Claytonia exigua | Torr. & A.Gray | Montiaceae | 8 |
| Claytonia lanceolata | Pursh | Montiaceae | 8 |
| Claytonia megarhiza | (A.Gray) Parry ex S.Watson | Montiaceae | 8 |
| Claytonia parviflora | Douglas | Montiaceae | 8 |
| Claytonia perfoliata | Donn ex Willd. | Montiaceae | 8 |
| Claytonia rubra | (Howell) Tidestr. | Montiaceae | 8 |
| Claytonia umbellata | S.Watson | Montiaceae | 8 |
| Clematis ligusticifolia | Nutt. | Ranunculaceae | 8 |
| Cleome dodecandra | L. | 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 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 |
| Coleogyne ramosissima | Torr. | Rosaceae | 8 |
| Collinsia parviflora | Douglas ex Lindl. | Plantaginaceae | 8 |
| Collinsia torreyi | A.Gray | Plantaginaceae | 8 |
| Collomia debilis | Greene | Polemoniaceae | 8 |
| Collomia grandiflora | Douglas ex Lindl. | Polemoniaceae | 8 |
| Collomia linearis | Nutt. | Polemoniaceae | 8 |
| Collomia tinctoria | Kellogg | Polemoniaceae | 8 |
| Colubrina californica | I.M.Johnst. | Rhamnaceae | 8 |
| Comandra umbellata | (L.) Nutt. | Santalaceae | 8 |
| Comastoma tenellum | (Rottb.) Toyok. | Gentianaceae | 8 |
| Corallorhiza maculata | Raf. | Orchidaceae | 8 |
| Corallorhiza striata | Lindl. | Orchidaceae | 8 |
| Cordylanthus capitatus | Nutt. ex Benth. | Orobanchaceae | 8 |
| Cordylanthus ramosus | Nutt. ex Benth. | Orobanchaceae | 8 |
| Cornus sericea | L. | Cornaceae | 8 |
| Corydalis aurea | Willd. | Papaveraceae | 8 |
| Crataegus rivularis | Nutt. | Rosaceae | 8 |
| Crepis acuminata | Nutt. | Asteraceae | 8 |
| Crepis atribarba | A.Heller | Asteraceae | 8 |
| Crepis intermedia | A.Gray | Asteraceae | 8 |
| Crepis occidentalis | Nutt. | Asteraceae | 8 |
| Cressa truxillensis | Kunth | Convolvulaceae | 8 |
| Crossosoma bigelovii | S.Watson | Crossosomataceae | 8 |
| Croton californicus | Müll.Arg. | 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 dumetorum | (Greene ex A.Gray) Greene | Boraginaceae | 8 |
| Cryptantha fendleri | (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 maritima | (Greene) 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 stelleri | (S.G.Gmel.) Prantl | Pteridaceae | 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 |
| Cusickiella douglasii | (A.Gray) Rollins | Brassicaceae | 8 |
| Cusickiella quadricostata | (Rollins) Rollins | Brassicaceae | 8 |
| Cylindropuntia acanthocarpa | (Engelm. & J.M.Bigelow) F.M.Knuth | Cactaceae | 8 |
| Cylindropuntia bigelovii | (Engelm.) F.M.Knuth | Cactaceae | 8 |
| Cylindropuntia echinocarpa | (Engelm. & J.M.Bigelow) F.M.Knuth | Cactaceae | 8 |
| Cylindropuntia multigeniculata | (Clokey) Backeb. | Cactaceae | 8 |
| Cylindropuntia ramosissima | (Engelm.) F.M.Knuth | Cactaceae | 8 |
| Cylindropuntia whipplei | (Engelm. & J.M.Bigelow) F.M.Knuth | Cactaceae | 8 |
| Cymopterus aboriginum | M.E.Jones | Apiaceae | 8 |
| Cymopterus cinerarius | A.Gray | Apiaceae | 8 |
| Cymopterus gilmanii | C.V.Morton | Apiaceae | 8 |
| Cymopterus globosus | (S.Watson) S.Watson | Apiaceae | 8 |
| Cymopterus goodrichii | S.L.Welsh & Neese | Apiaceae | 8 |
| Cymopterus hendersonii | (J.M.Coult. & Rose) Cronquist | Apiaceae | 8 |
| Cymopterus longipes | S.Watson | Apiaceae | 8 |
| Cymopterus nivalis | 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 bipartitus | Torr. | Cyperaceae | 8 |
| Cyperus esculentus | L. | Cyperaceae | 8 |
| Cyperus squarrosus | L. | Cyperaceae | 8 |
| Cyperus strigosus | L. | Cyperaceae | 8 |
| Cystopteris fragilis | (L.) Bernh. | Cystopteridaceae | 8 |
| Cystopteris tenuis | (Michx.) Desv. | Cystopteridaceae | 8 |
| Dalea mollissima | (Rydb.) Munz | Fabaceae | 8 |
| Dalea multiflora | (Nutt.) Shinners | 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 |
| Dasiphora fruticosa | (L.) Rydb. | Rosaceae | 8 |
| Datisca glomerata | (C.Presl) Baill. | Datiscaceae | 8 |
| Daucus pusillus | Michx. | Apiaceae | 8 |
| Delphinium andersonii | A.Gray | Ranunculaceae | 8 |
| Delphinium glaucum | S.Watson | Ranunculaceae | 8 |
| Delphinium nuttallianum | Pritz. | Ranunculaceae | 8 |
| Delphinium occidentale | S.Watson ex J.M.Coult. | Ranunculaceae | 8 |
| Delphinium parishii | A.Gray | Ranunculaceae | 8 |
| Delphinium polycladon | Eastw. | Ranunculaceae | 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 longepedicellata | (E.Fourn.) O.E.Schulz | Brassicaceae | 8 |
| Descurainia pinnata | (Walter) Britton | Brassicaceae | 8 |
| Dicentra uniflora | Kellogg | Papaveraceae | 8 |
| Dichelostemma capitatum | (Benth.) Alph.Wood | Asparagaceae | 8 |
| Dicoria canescens | A.Gray | Asteraceae | 8 |
| Dieteria asteroides | Torr. | Asteraceae | 8 |
| Dieteria canescens | (Pursh) Nutt. | Asteraceae | 8 |
| Diplachne fusca | (L.) P.Beauv. | Poaceae | 8 |
| Diplacus bigelovii | (A.Gray) G.L.Nesom | Phrymaceae | 8 |
| Diplacus jepsonii | (A.L.Grant) G.L.Nesom | Phrymaceae | 8 |
| Diplacus leptaleus | (A.Gray) G.L.Nesom | Phrymaceae | 8 |
| Diplacus mephiticus | (Greene) G.L.Nesom | Phrymaceae | 8 |
| Diplacus nanus | (Hook. & Arn.) G.L.Nesom | Phrymaceae | 8 |
| Diplacus ovatus | (A.Gray) G.L.Nesom | Phrymaceae | 8 |
| Diplacus parryi | (A.Gray) G.L.Nesom & N.S.Fraga | Phrymaceae | 8 |
| Distichlis spicata | (L.) Greene | Poaceae | 8 |
| Ditaxis serrata | (Torr.) A.Heller | Euphorbiaceae | 8 |
| Dithyrea californica | Harv. | Brassicaceae | 8 |
| Downingia bacigalupii | Weiler | Campanulaceae | 8 |
| Downingia bicornuta | A.Gray | Campanulaceae | 8 |
| Downingia insignis | Greene | Campanulaceae | 8 |
| Draba albertina | Greene | Brassicaceae | 8 |
| Draba aurea | Vahl ex Hornem. | Brassicaceae | 8 |
| Draba cana | Rydb. | Brassicaceae | 8 |
| Draba densifolia | Nutt. | Brassicaceae | 8 |
| Draba jaegeri | Munz & I.M.Johnst. | Brassicaceae | 8 |
| Draba lonchocarpa | Rydb. | 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 |
| Dracocephalum parviflorum | Nutt. | Lamiaceae | 8 |
| Drymocallis convallaria | (Rydb.) Rydb. | Rosaceae | 8 |
| Drymocallis glandulosa | (Lindl.) Rydb. | Rosaceae | 8 |
| Dryopteris filix-mas | (L.) Schott | Dryopteridaceae | 8 |
| Dudleya arizonica | Rose | Crassulaceae | 8 |
| Dyssodia papposa | (Vent.) Hitchc. | 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 |
| Elatine brachysperma | A.Gray | Elatinaceae | 8 |
| Eleocharis acicularis | (L.) Roem. & Schult. | Cyperaceae | 8 |
| Eleocharis atropurpurea | (Retz.) J.Presl & C.Presl | Cyperaceae | 8 |
| Eleocharis geniculata | (L.) Roem. & Schult. | Cyperaceae | 8 |
| Eleocharis macrostachya | Britton | Cyperaceae | 8 |
| Eleocharis obtusa | (Willd.) Schult. | Cyperaceae | 8 |
| Eleocharis palustris | (L.) Roem. & Schult. | Cyperaceae | 8 |
| Eleocharis quinqueflora | (Hartmann) O.Schwarz | Cyperaceae | 8 |
| Eleocharis rostellata | (Torr.) Torr. | Cyperaceae | 8 |
| Eleocharis uniglumis | (Link) Schult. | Cyperaceae | 8 |
| Ellisia nyctelea | (L.) L. | Hydrophyllaceae | 8 |
| Elodea canadensis | Michx. | Hydrocharitaceae | 8 |
| Elodea nuttallii | (Planch.) H.St.John | Hydrocharitaceae | 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 |
| Encelia actoni | Elmer | Asteraceae | 8 |
| Encelia farinosa | A.Gray ex Torr. | Asteraceae | 8 |
| Encelia frutescens | A.Gray | Asteraceae | 8 |
| Encelia virginensis | A.Nelson | Asteraceae | 8 |
| Enceliopsis argophylla | A.Nelson | Asteraceae | 8 |
| Enceliopsis nudicaulis | A.Nelson | Asteraceae | 8 |
| Enneapogon desvauxii | P.Beauv. | Poaceae | 8 |
| Ephedra nevadensis | S.Watson | Ephedraceae | 8 |
| Ephedra torreyana | 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 lactiflorum | Hausskn. | Onagraceae | 8 |
| Epilobium latifolium | L. | Onagraceae | 8 |
| Epilobium leptophyllum | Raf. | Onagraceae | 8 |
| Epilobium minutum | Lindl. | Onagraceae | 8 |
| Epilobium obcordatum | A.Gray | Onagraceae | 8 |
| Epipactis gigantea | Douglas | Orchidaceae | 8 |
| Equisetum arvense | L. | Equisetaceae | 8 |
| Equisetum hyemale | L. | Equisetaceae | 8 |
| Equisetum laevigatum | A.Braun | Equisetaceae | 8 |
| Eragrostis hypnoides | (Lam.) Britton, Sterns & Poggenb. | Poaceae | 8 |
| Eragrostis pectinacea | (Michx.) Nees | Poaceae | 8 |
| Eremalche exilis | (A.Gray) Greene | Malvaceae | 8 |
| Eremalche rotundifolia | (A.Gray) Greene | Malvaceae | 8 |
| Eremocarya micrantha | (Torr.) Greene | Boraginaceae | 8 |
| Eremogone aculeata | (S.Watson) Ikonn. | Caryophyllaceae | 8 |
| Eremogone capillaris | (Poir.) Fenzl | Caryophyllaceae | 8 |
| Eremogone congesta | (Nutt.) Ikonn. | Caryophyllaceae | 8 |
| Eremogone ferrisiae | (Abrams) R.L.Hartm. & Rabeler | Caryophyllaceae | 8 |
| Eremogone franklinii | (Douglas ex Hook.) 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 nevadensis | (Kellogg) W.L.Wagner & Hoch | Onagraceae | 8 |
| Eremothera refracta | (S.Watson) W.L.Wagner & Hoch | Onagraceae | 8 |
| Eriastrum diffusum | (A.Gray) H.Mason | Polemoniaceae | 8 |
| Eriastrum eremicum | (Jeps.) H.Mason | Polemoniaceae | 8 |
| Eriastrum signatum | D.Gowen | Polemoniaceae | 8 |
| Eriastrum wilcoxii | (A.Nelson) H.Mason | Polemoniaceae | 8 |
| Ericameria albida | (M.E.Jones ex A.Gray) L.C.Anderson | Asteraceae | 8 |
| Ericameria bloomeri | J.F.Macbr. | Asteraceae | 8 |
| Ericameria cooperi | H.M.Hall | Asteraceae | 8 |
| Ericameria cuneata | McClatchie | Asteraceae | 8 |
| Ericameria discoidea | (Nutt.) 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 parryi | (A.Gray) G.L.Nesom & G.I.Baird | Asteraceae | 8 |
| Ericameria suffruticosa | (Nutt.) G.L.Nesom | Asteraceae | 8 |
| Ericameria teretifolia | Jeps. | Asteraceae | 8 |
| Erigeron aphanactis | Greene | Asteraceae | 8 |
| Erigeron bloomeri | A.Gray | Asteraceae | 8 |
| Erigeron breweri | A.Gray | Asteraceae | 8 |
| Erigeron canadensis | L. | 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 filifolius | Nutt. | Asteraceae | 8 |
| Erigeron flagellaris | A.Gray | Asteraceae | 8 |
| Erigeron glacialis | (Nutt.) A.Nelson | Asteraceae | 8 |
| Erigeron inornatus | A.Gray | Asteraceae | 8 |
| Erigeron latus | (A.Nelson & J.F.Macbr.) Cronquist | Asteraceae | 8 |
| Erigeron linearis | (Hook.) Piper | Asteraceae | 8 |
| Erigeron lonchophyllus | Hook. | Asteraceae | 8 |
| Erigeron philadelphicus | L. | Asteraceae | 8 |
| Erigeron pumilus | Nutt. | Asteraceae | 8 |
| Erigeron pygmaeus | Greene | Asteraceae | 8 |
| Erigeron speciosus | (Lindl.) DC. | Asteraceae | 8 |
| Erigeron tener | A.Gray | Asteraceae | 8 |
| Erigeron tracyi | Greene | Asteraceae | 8 |
| Erigeron ursinus | D.C.Eaton | Asteraceae | 8 |
| Eriochloa contracta | Hitchc. | Poaceae | 8 |
| Eriocoma arida | (M.E.Jones) 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 angustifolium | Nutt. | Namaceae | 8 |
| Eriogonum anemophilum | Greene | Polygonaceae | 8 |
| Eriogonum argophyllum | Reveal | Polygonaceae | 8 |
| Eriogonum baileyi | S.Watson | Polygonaceae | 8 |
| Eriogonum brachypodum | Torr. & A.Gray | Polygonaceae | 8 |
| Eriogonum brevicaule | Nutt. | Polygonaceae | 8 |
| Eriogonum caespitosum | Nutt. | Polygonaceae | 8 |
| Eriogonum cernuum | Nutt. | Polygonaceae | 8 |
| Eriogonum clavatum | Small | Polygonaceae | 8 |
| Eriogonum contiguum | (Reveal) Reveal | Polygonaceae | 8 |
| Eriogonum corymbosum | Benth. | Polygonaceae | 8 |
| Eriogonum davidsonii | Greene | Polygonaceae | 8 |
| Eriogonum deflexum | Torr. | Polygonaceae | 8 |
| Eriogonum desertorum | (Maguire) R.J.Davis | Polygonaceae | 8 |
| Eriogonum diatomaceum | Reveal, J.Reynolds & Picciani | Polygonaceae | 8 |
| Eriogonum douglasii | Benth. | Polygonaceae | 8 |
| Eriogonum elatum | Douglas ex Benth. | Polygonaceae | 8 |
| Eriogonum exaltatum | M.E.Jones | Polygonaceae | 8 |
| Eriogonum fasciculatum | Benth. | Polygonaceae | 8 |
| Eriogonum glandulosum | (Nutt.) Nutt. ex Benth. | Polygonaceae | 8 |
| Eriogonum gracilipes | S.Watson | Polygonaceae | 8 |
| Eriogonum heermannii | Durand & Hilg. | Polygonaceae | 8 |
| Eriogonum heracleoides | Nutt. | Polygonaceae | 8 |
| Eriogonum hookeri | S.Watson | Polygonaceae | 8 |
| Eriogonum incanum | Torr. & A.Gray | Polygonaceae | 8 |
| Eriogonum inflatum | Torr. & Frém. | Polygonaceae | 8 |
| Eriogonum kingii | Torr. & A.Gray | Polygonaceae | 8 |
| Eriogonum latens | Jeps. | Polygonaceae | 8 |
| Eriogonum lemmonii | S.Watson | Polygonaceae | 8 |
| Eriogonum lobbii | Torr. & A.Gray | 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 nudum | Douglas ex Benth. | Polygonaceae | 8 |
| Eriogonum nummulare | M.E.Jones | Polygonaceae | 8 |
| Eriogonum ochrocephalum | S.Watson | Polygonaceae | 8 |
| Eriogonum ovalifolium | Nutt. | Polygonaceae | 8 |
| Eriogonum palmerianum | Reveal | Polygonaceae | 8 |
| Eriogonum panamintense | C.V.Morton | Polygonaceae | 8 |
| Eriogonum plumatella | Durand & Hilg. | Polygonaceae | 8 |
| Eriogonum pusillum | Torr. & A.Gray | Polygonaceae | 8 |
| Eriogonum racemosum | Nutt. | Polygonaceae | 8 |
| Eriogonum reniforme | Torr. & Frém. | Polygonaceae | 8 |
| Eriogonum rixfordii | S.Stokes | Polygonaceae | 8 |
| Eriogonum robustum | Greene | Polygonaceae | 8 |
| Eriogonum rosense | A.Nelson & P.B.Kenn. | Polygonaceae | 8 |
| Eriogonum rupinum | Reveal | Polygonaceae | 8 |
| Eriogonum saxatile | S.Watson | Polygonaceae | 8 |
| Eriogonum shockleyi | S.Watson | 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 tiehmii | Reveal | Polygonaceae | 8 |
| Eriogonum trichopes | Torr. | Polygonaceae | 8 |
| Eriogonum umbellatum | Torr. | Polygonaceae | 8 |
| Eriogonum villiflorum | A.Gray | Polygonaceae | 8 |
| Eriogonum vimineum | Douglas ex Benth. | Polygonaceae | 8 |
| Eriogonum watsonii | Torr. & A.Gray | 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 lanatum | (Pursh) J.Forbes | Asteraceae | 8 |
| Eriophyllum lanosum | (A.Gray) 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 |
| Erysimum perenne | (S.Watson ex Coville) Abrams | Brassicaceae | 8 |
| Erythranthe arvensis | (Greene) G.L.Nesom | 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 erubescens | G.L.Nesom | Phrymaceae | 8 |
| Erythranthe floribunda | (Lindl.) G.L.Nesom | Phrymaceae | 8 |
| Erythranthe geyeri | (Torr.) G.L.Nesom | Phrymaceae | 8 |
| Erythranthe guttata | (DC.) G.L.Nesom | Phrymaceae | 8 |
| Erythranthe lewisii | (Pursh) G.L.Nesom & N.S.Fraga | Phrymaceae | 8 |
| Erythranthe microphylla | (Benth.) G.L.Nesom | Phrymaceae | 8 |
| Erythranthe moschata | (Douglas ex Lindl.) G.L.Nesom | Phrymaceae | 8 |
| Erythranthe nasuta | (Greene) G.L.Nesom | 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 rubella | (A.Gray) N.S.Fraga | Phrymaceae | 8 |
| Erythranthe suksdorfii | (A.Gray) N.S.Fraga | Phrymaceae | 8 |
| Erythranthe tilingii | (Regel) G.L.Nesom | Phrymaceae | 8 |
| Eschscholzia californica | Cham. | Papaveraceae | 8 |
| Eschscholzia glyptosperma | Greene | Papaveraceae | 8 |
| Eschscholzia minutiflora | S.Watson | 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 |
| Euphorbia albomarginata | Torr. & A.Gray | Euphorbiaceae | 8 |
| Euphorbia brachycera | Engelm. | Euphorbiaceae | 8 |
| Euphorbia fendleri | Torr. & A.Gray | Euphorbiaceae | 8 |
| Euphorbia glyptosperma | Engelm. | Euphorbiaceae | 8 |
| Euphorbia hirta | L. | Euphorbiaceae | 8 |
| Euphorbia lurida | Engelm. | Euphorbiaceae | 8 |
| Euphorbia micromera | Boiss. | Euphorbiaceae | 8 |
| Euphorbia ocellata | Durand & Hilg. | Euphorbiaceae | 8 |
| Euphorbia parishii | Greene | Euphorbiaceae | 8 |
| Euphorbia parryi | Engelm. | Euphorbiaceae | 8 |
| Euphorbia revoluta | Engelm. | Euphorbiaceae | 8 |
| Euphorbia schizoloba | Engelm. | Euphorbiaceae | 8 |
| Euphorbia serpillifolia | Pers. | Euphorbiaceae | 8 |
| Euphorbia setiloba | Engelm. | Euphorbiaceae | 8 |
| Euphrosyne nevadensis | (M.E.Jones) Panero | Asteraceae | 8 |
| Euploca convolvulacea | Nutt. | Heliotropiaceae | 8 |
| Eurybia integrifolia | (Nutt.) G.L.Nesom | Asteraceae | 8 |
| Eustoma exaltatum | (L.) Salisb. ex G.Don | Gentianaceae | 8 |
| Euthamia occidentalis | Nutt. | Asteraceae | 8 |
| Fallugia paradoxa | (D.Don ex Tilloch & Taylor) Endl. ex Torr. | Rosaceae | 8 |
| Fendlera rupicola | A.Gray | Hydrangeaceae | 8 |
| Fendlerella utahensis | (S.Watson) A.Heller | Hydrangeaceae | 8 |
| Ferocactus acanthodes | (Lem.) Britton & Rose | Cactaceae | 8 |
| Festuca arizonica | Vasey | Poaceae | 8 |
| Festuca brachyphylla | Schult. & Schult.f. | Poaceae | 8 |
| Festuca idahoensis | Elmer | Poaceae | 8 |
| Festuca kingii | (S.Watson) Cassidy | Poaceae | 8 |
| Festuca microstachys | Nutt. | Poaceae | 8 |
| Festuca octoflora | Walter | Poaceae | 8 |
| Festuca rubra | L. | Poaceae | 8 |
| Fimbristylis thermalis | S.Watson | Cyperaceae | 8 |
| Floerkea proserpinacoides | Willd. | Limnanthaceae | 8 |
| Forestiera pubescens | Nutt. | Oleaceae | 8 |
| Fouquieria splendens | Engelm. | Fouquieriaceae | 8 |
| Fragaria virginiana | Mill. | Rosaceae | 8 |
| Frangula californica | (Eschsch.) A.Gray | Rhamnaceae | 8 |
| Frangula obovata | (Kearney & Peebles) G.L.Nesom & Sawyer | Rhamnaceae | 8 |
| Frankenia salina | (Molina) I.M.Johnst. | Frankeniaceae | 8 |
| Frasera albicaulis | Griseb. | Gentianaceae | 8 |
| Frasera albomarginata | S.Watson | Gentianaceae | 8 |
| Frasera puberulenta | Davidson | Gentianaceae | 8 |
| Frasera speciosa | Douglas ex Griseb. | Gentianaceae | 8 |
| Fraxinus anomala | Torr. ex S.Watson | Oleaceae | 8 |
| Fraxinus cuspidata | Torr. | Oleaceae | 8 |
| Fraxinus dipetala | Hook. & Arn. | Oleaceae | 8 |
| Fraxinus velutina | Torr. | Oleaceae | 8 |
| Fritillaria atropurpurea | Nutt. | Liliaceae | 8 |
| Fritillaria pudica | (Pursh) Spreng. | Liliaceae | 8 |
| Fritillaria recurva | Benth. | Liliaceae | 8 |
| Funastrum heterophyllum | (Engelm. ex Torr.) Standl. | Apocynaceae | 8 |
| Funastrum utahense | (Engelm.) Liede & Meve | Apocynaceae | 8 |
| Gagea serotina | (L.) Ker Gawl. | Liliaceae | 8 |
| Gaillardia pinnatifida | Torr. | Asteraceae | 8 |
| Galium grayanum | Ehrend. | Rubiaceae | 8 |
| Galium mexicanum | Kunth | 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 |
| Garrya flavescens | S.Watson | Garryaceae | 8 |
| Garrya fremontii | Torr. | Garryaceae | 8 |
| Gaultheria humifusa | (Graham) Rydb. | 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 |
| Gentianopsis holopetala | (A.Gray) Iltis | Gentianaceae | 8 |
| Gentianopsis simplex | (A.Gray) Iltis | Gentianaceae | 8 |
| Gentianopsis thermalis | (Kuntze) Iltis | Gentianaceae | 8 |
| Geraea canescens | Torr. & A.Gray | Asteraceae | 8 |
| Geranium caespitosum | E.James | Geraniaceae | 8 |
| Geranium carolinianum | L. | Geraniaceae | 8 |
| Geranium richardsonii | Fisch. & Trautv. | Geraniaceae | 8 |
| Geranium viscosissimum | Fisch. & C.A.Mey. | Geraniaceae | 8 |
| Geum macrophyllum | Willd. | Rosaceae | 8 |
| Geum rossii | (R.Br.) Ser. | Rosaceae | 8 |
| Geum triflorum | Pursh | Rosaceae | 8 |
| Gilia brecciarum | M.E.Jones | Polemoniaceae | 8 |
| Gilia cana | (M.E.Jones) A.Heller | Polemoniaceae | 8 |
| Gilia clokeyi | H.Mason | Polemoniaceae | 8 |
| Gilia inconspicua | (Sm.) Sweet | Polemoniaceae | 8 |
| Gilia leptantha | Parish | Polemoniaceae | 8 |
| Gilia minor | A.D.Grant & V.E.Grant | 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 transmontana | (H.Mason & A.D.Grant) A.D.Grant & V.E.Grant | Polemoniaceae | 8 |
| Gleditsia triacanthos | L. | Fabaceae | 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 |
| Graphephorum canescens | (Buckley) Röser & Tkach | Poaceae | 8 |
| Graphephorum wolfii | (Vasey) Coult. | Poaceae | 8 |
| Gratiola neglecta | Torr. | Plantaginaceae | 8 |
| Grayia spinosa | (Hook.) Moq. | Chenopodiaceae | 8 |
| Grindelia hirsutula | Hook. & Arn. | Asteraceae | 8 |
| Grindelia squarrosa | (Pursh) Dunal | Asteraceae | 8 |
| Grusonia parishii | (Orcutt) Pinkava | Cactaceae | 8 |
| Gutierrezia microcephala | (DC.) A.Gray | Asteraceae | 8 |
| Gutierrezia sarothrae | (Pursh) Britton & Rusby | Asteraceae | 8 |
| Gymnosteris nudicaulis | (Hook. & Arn.) Greene | Polemoniaceae | 8 |
| Gymnosteris parvula | A.Heller | Polemoniaceae | 8 |
| Hackelia cusickii | Brand | Boraginaceae | 8 |
| Hackelia floribunda | (Lehm.) I.M.Johnst. | Boraginaceae | 8 |
| Hackelia micrantha | (Eastw.) J.L.Gentry | Boraginaceae | 8 |
| Hackelia nervosa | (Kellogg) I.M.Johnst. | Boraginaceae | 8 |
| Hackelia patens | 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 |
| Hebecarpa macradenia | (A.Gray) J.R.Abbott | Polygalaceae | 8 |
| Hebecarpa obscura | (Benth.) J.R.Abbott | Polygalaceae | 8 |
| Hecastocleis shockleyi | A.Gray | Asteraceae | 8 |
| Hedeoma drummondii | Benth. | Lamiaceae | 8 |
| Hedeoma nana | (Torr.) Briq. | Lamiaceae | 8 |
| Hedysarum boreale | Nutt. | Fabaceae | 8 |
| Helenium autumnale | L. | Asteraceae | 8 |
| Helianthella californica | A.Gray | Asteraceae | 8 |
| Helianthella quinquenervis | (Hook.) A.Gray | Asteraceae | 8 |
| Helianthella uniflora | Torr. & A.Gray | Asteraceae | 8 |
| Helianthus annuus | L. | Asteraceae | 8 |
| Helianthus ciliaris | DC. | Asteraceae | 8 |
| Helianthus cusickii | A.Gray | Asteraceae | 8 |
| Helianthus deserticola | Heiser | Asteraceae | 8 |
| Helianthus nuttallii | Torr. & A.Gray | Asteraceae | 8 |
| Helianthus petiolaris | Nutt. | Asteraceae | 8 |
| Heliomeris multiflora | Nutt. | Asteraceae | 8 |
| Heliotropium curassavicum | L. | Heliotropiaceae | 8 |
| Hemizonella minima | A.Gray | Asteraceae | 8 |
| Heracleum maximum | W.Bartram | Apiaceae | 8 |
| Hesperocallis undulata | A.Gray | Asparagaceae | 8 |
| Hesperochiron nanus | (Lindl.) Greene | Hydrophyllaceae | 8 |
| Hesperochiron pumilus | (Griseb.) Porter | Hydrophyllaceae | 8 |
| Hesperostipa comata | (Trin. & Rupr.) Barkworth | Poaceae | 8 |
| Hesperostipa neomexicana | (Thurb.) Barkworth | Poaceae | 8 |
| Heterocodon rariflorus | Nutt. | Campanulaceae | 8 |
| Heterotheca grandiflora | Nutt. | Asteraceae | 8 |
| Heterotheca polothrix | G.L.Nesom | Asteraceae | 8 |
| Heterotheca subaxillaris | (Lam.) Britton & Rusby | Asteraceae | 8 |
| Heuchera cylindrica | Douglas | Saxifragaceae | 8 |
| Heuchera parvifolia | Nutt. ex Torr. & A.Gray | Saxifragaceae | 8 |
| Heuchera rubescens | Torr. | Saxifragaceae | 8 |
| Hibiscus denudatus | Benth. | Malvaceae | 8 |
| Hieracium albiflorum | Hook. | Asteraceae | 8 |
| Hieracium fendleri | Sch.Bip. | Asteraceae | 8 |
| Hieracium horridum | Fr. | Asteraceae | 8 |
| Hieracium scouleri | Hook. | Asteraceae | 8 |
| Hilaria jamesii | (Torr.) Benth. | Poaceae | 8 |
| Hippuris vulgaris | L. | Plantaginaceae | 8 |
| Holodiscus discolor | (Pursh) Maxim. | Rosaceae | 8 |
| Hordeum brachyantherum | Nevski | Poaceae | 8 |
| Hordeum jubatum | L. | Poaceae | 8 |
| Hosackia oblongifolia | Benth. | Fabaceae | 8 |
| Hulsea algida | A.Gray | Asteraceae | 8 |
| Hulsea heterochroma | A.Gray | Asteraceae | 8 |
| Hulsea vestita | A.Gray | Asteraceae | 8 |
| Humulus neomexicanus | (A.Nelson & Cockerell) Rydb. | Cannabaceae | 8 |
| Hydrocotyle verticillata | Thunb. | Araliaceae | 8 |
| Hydrophyllum alpestre | A.Nelson & P.B.Kenn. | Hydrophyllaceae | 8 |
| Hydrophyllum occidentale | (S.Watson) A.Gray | Hydrophyllaceae | 8 |
| Hymenopappus filifolius | Hook. | Asteraceae | 8 |
| Hymenothrix dissecta | (A.Gray) B.G.Baldwin | Asteraceae | 8 |
| Hymenoxys cooperi | Cockerell | Asteraceae | 8 |
| Hymenoxys hoopesii | (A.Gray) Bierner | Asteraceae | 8 |
| Hypericum anagalloides | Cham. & Schltdl. | Hypericaceae | 8 |
| Hypericum scouleri | Hook. | Hypericaceae | 8 |
| Idahoa scapigera | (Hook.) A.Nelson & J.F.Macbr. | Brassicaceae | 8 |
| Iliamna rivularis | (Douglas) Greene | Malvaceae | 8 |
| Ionactis alpina | (Nutt.) Greene | Asteraceae | 8 |
| Ionactis caelestis | P.J.Leary & G.L.Nesom | 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 tenuituba | (Rydb.) V.E.Grant | Polemoniaceae | 8 |
| Iris missouriensis | Nutt. | Iridaceae | 8 |
| Isocoma acradenia | (Greene) Greene | Asteraceae | 8 |
| Isoetes bolanderi | Engelm. | Isoetaceae | 8 |
| Iva axillaris | Pursh | Asteraceae | 8 |
| Jamesia americana | Torr. & A.Gray | Hydrangeaceae | 8 |
| Johnstonella angustifolia | (Torr.) 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 |
| Juncus acutus | L. | Juncaceae | 8 |
| Juncus articulatus | L. | Juncaceae | 8 |
| Juncus balticus | Willd. | Juncaceae | 8 |
| Juncus cooperi | Engelm. | Juncaceae | 8 |
| Juncus drummondii | E.Mey. | Juncaceae | 8 |
| Juncus dudleyi | Wiegand | Juncaceae | 8 |
| Juncus ensifolius | Wikstr. | Juncaceae | 8 |
| Juncus mertensianus | Bong. | Juncaceae | 8 |
| Juncus nodosus | L. | Juncaceae | 8 |
| Juncus occidentalis | (Coville) Wiegand | Juncaceae | 8 |
| Juncus parryi | 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 monosperma | (Engelm.) Sarg. | Cupressaceae | 8 |
| Juniperus occidentalis | Hook. | Cupressaceae | 8 |
| Juniperus osteosperma | (Torr.) Little | Cupressaceae | 8 |
| Juniperus scopulorum | Sarg. | Cupressaceae | 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 lemmonii | (A.Gray) Straw | Plantaginaceae | 8 |
| Keckiella rothrockii | (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 |
| Koeleria macrantha | (Ledeb.) Schult. | Poaceae | 8 |
| Koeleria spicata | (L.) Barberá, Quintanar, Soreng & P.M.Peterson | Poaceae | 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 canadensis | L. | 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 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 |
| Lathyrus brachycalyx | Rydb. | Fabaceae | 8 |
| Lathyrus lanszwertii | Kellogg | Fabaceae | 8 |
| Leersia oryzoides | (L.) Sw. | Poaceae | 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 |
| Lepidium alyssoides | A.Gray | Brassicaceae | 8 |
| Lepidium densiflorum | Schrad. | Brassicaceae | 8 |
| Lepidium flavum | Torr. | Brassicaceae | 8 |
| Lepidium fremontii | S.Watson | Brassicaceae | 8 |
| Lepidium lasiocarpum | Nutt. | Brassicaceae | 8 |
| Lepidium montanum | Nutt. | Brassicaceae | 8 |
| Lepidium nanum | S.Watson | Brassicaceae | 8 |
| Lepidium tiehmii | (Rollins) Al-Shehbaz | Brassicaceae | 8 |
| Lepidium virginicum | L. | Brassicaceae | 8 |
| Lepidospartum latisquamum | S.Watson | Asteraceae | 8 |
| Leptochloa panicea | (Retz.) Ohwi | Poaceae | 8 |
| Leptosiphon chrysanthus | J.M.Porter & R.Patt. | Polemoniaceae | 8 |
| Leptosiphon ciliatus | (Benth.) Jeps. | Polemoniaceae | 8 |
| Leptosiphon liniflorus | (Benth.) J.M.Porter & L.A.Johnson | Polemoniaceae | 8 |
| Leptosiphon nuttallii | (A.Gray) J.M.Porter & L.A.Johnson | Polemoniaceae | 8 |
| Leptosiphon septentrionalis | (H.Mason) J.M.Porter & L.A.Johnson | Polemoniaceae | 8 |
| Lessingia glandulifera | 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 |
| Lewisia maguirei | A.H.Holmgren | Montiaceae | 8 |
| Lewisia nevadensis | (A.Gray) 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 triticoides | (Buckley) Pilg. | Poaceae | 8 |
| Ligusticum grayi | J.M.Coult. & Rose | Apiaceae | 8 |
| Ligusticum porteri | J.M.Coult. & Rose | Apiaceae | 8 |
| Lilium parvum | Kellogg | Liliaceae | 8 |
| Limonium californicum | (Boiss.) A.Heller | Plumbaginaceae | 8 |
| Limosella aquatica | L. | Plantaginaceae | 8 |
| Linanthus caespitosus | (Nutt.) J.M.Porter & L.A.Johnson | Polemoniaceae | 8 |
| Linanthus campanulatus | (A.Gray) J.M.Porter & L.A.Johnson | Polemoniaceae | 8 |
| Linanthus demissus | (A.Gray) 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 pungens | (Torr.) J.M.Porter & L.A.Johnson | Polemoniaceae | 8 |
| Linanthus watsonii | (A.Gray) Wherry | Polemoniaceae | 8 |
| Lindernia dubia | (L.) Pennell | Linderniaceae | 8 |
| Linum australe | A.Heller | Linaceae | 8 |
| Linum kingii | S.Watson | Linaceae | 8 |
| Linum lewisii | Pursh | Linaceae | 8 |
| Linum puberulum | (Engelm.) A.Heller | Linaceae | 8 |
| Linum subteres | (Trel.) H.J.P.Winkl. | Linaceae | 8 |
| Lithophragma glabrum | Nutt. | Saxifragaceae | 8 |
| Lithophragma parviflorum | (Hook.) Nutt. | Saxifragaceae | 8 |
| Lithophragma tenellum | Nutt. | Saxifragaceae | 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 depressa | (A.Gray) Holub | Asteraceae | 8 |
| Lomatium austiniae | (J.M.Coult. & Rose) J.M.Coult. & Rose | Apiaceae | 8 |
| Lomatium canbyi | (J.M.Coult. & Rose) J.M.Coult. & Rose | Apiaceae | 8 |
| Lomatium cous | (S.Watson) J.M.Coult. & Rose | Apiaceae | 8 |
| Lomatium donnellii | (J.M.Coult. & Rose) J.M.Coult. & Rose | Apiaceae | 8 |
| Lomatium foeniculaceum | (Nutt.) J.M.Coult. & Rose | Apiaceae | 8 |
| Lomatium hendersonii | (J.M.Coult. & Rose) J.M.Coult. & Rose | Apiaceae | 8 |
| Lomatium linearifolium | (S.Watson) J.F.Sm. & Mansfield | 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 triternatum | (Pursh) 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 involucrata | (Richardson) Banks ex Spreng. | Caprifoliaceae | 8 |
| Ludwigia repens | J.R.Forst. | Onagraceae | 8 |
| Lupinus argenteus | Pursh | Fabaceae | 8 |
| Lupinus arizonicus | (S.Watson) S.Watson | Fabaceae | 8 |
| Lupinus brevicaulis | S.Watson | Fabaceae | 8 |
| Lupinus breweri | A.Gray | Fabaceae | 8 |
| Lupinus burkei | S.Watson | Fabaceae | 8 |
| Lupinus caudatus | Kellogg | Fabaceae | 8 |
| Lupinus concinnus | J.Agardh | Fabaceae | 8 |
| Lupinus excubitus | M.E.Jones | Fabaceae | 8 |
| Lupinus flavoculatus | A.Heller | Fabaceae | 8 |
| Lupinus grayi | S.Watson | Fabaceae | 8 |
| Lupinus hillii | Greene | Fabaceae | 8 |
| Lupinus kingii | S.Watson | Fabaceae | 8 |
| Lupinus latifolius | Lindl. ex J.Agardh | Fabaceae | 8 |
| Lupinus leucophyllus | Douglas ex Lindl. | Fabaceae | 8 |
| Lupinus malacophyllus | Greene | Fabaceae | 8 |
| Lupinus meionanthus | A.Gray | Fabaceae | 8 |
| Lupinus microcarpus | Sims | Fabaceae | 8 |
| Lupinus nevadensis | A.Heller | Fabaceae | 8 |
| Lupinus obtusilobus | A.Heller | Fabaceae | 8 |
| Lupinus polyphyllus | Lindl. | Fabaceae | 8 |
| Lupinus prunophilus | M.E.Jones | Fabaceae | 8 |
| Lupinus pusillus | Pursh | Fabaceae | 8 |
| Lupinus saxosus | Howell | Fabaceae | 8 |
| Lupinus shockleyi | S.Watson | Fabaceae | 8 |
| Lupinus sparsiflorus | Benth. | Fabaceae | 8 |
| Luzula comosa | E.Mey. | Juncaceae | 8 |
| Luzula parviflora | (Ehrh.) Desv. | Juncaceae | 8 |
| Luzula spicata | (L.) DC. | Juncaceae | 8 |
| Lycium andersonii | A.Gray | Solanaceae | 8 |
| Lycium cooperi | A.Gray | Solanaceae | 8 |
| Lycium pallidum | Miers | Solanaceae | 8 |
| Lycium parishii | A.Gray | Solanaceae | 8 |
| Lycium shockleyi | A.Gray | Solanaceae | 8 |
| Lycium torreyi | A.Gray | Solanaceae | 8 |
| Lycopus americanus | Muhl. ex W.P.C.Barton | Lamiaceae | 8 |
| Lycopus asper | Greene | Lamiaceae | 8 |
| Lygodesmia juncea | (Pursh) Sweet | Asteraceae | 8 |
| Lysimachia maritima | (L.) Galasso, Banfi & Soldano | 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 |
| Maianthemum racemosum | (L.) Link | Asparagaceae | 8 |
| Maianthemum stellatum | (L.) Link | Asparagaceae | 8 |
| Malacothrix coulteri | Harv. & A.Gray | Asteraceae | 8 |
| Malacothrix floccifera | (DC.) S.F.Blake | Asteraceae | 8 |
| Malacothrix glabrata | (A.Gray ex D.C.Eaton) 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 |
| Malvella lepidota | (A.Gray) Fryxell | Malvaceae | 8 |
| Malvella leprosa | (Ortega) Krapov. | Malvaceae | 8 |
| Marah fabacea | (Naudin) Greene | Cucurbitaceae | 8 |
| Marsilea vestita | Hook. & Grev. | Marsileaceae | 8 |
| Matricaria discoidea | DC. | Asteraceae | 8 |
| Maurandella antirrhiniflora | (Humb. & Bonpl. ex Willd.) Rothm. | Plantaginaceae | 8 |
| Melica bulbosa | Porter & J.M.Coult. | Poaceae | 8 |
| Melica imperfecta | Trin. | Poaceae | 8 |
| Melica stricta | Bol. | Poaceae | 8 |
| Melica subulata | (Griseb.) Scribn. | Poaceae | 8 |
| Menodora spinescens | A.Gray | Oleaceae | 8 |
| Mentha canadensis | L. | Lamiaceae | 8 |
| Mentzelia albicaulis | (Douglas ex Hook.) Douglas ex Torr. & A.Gray | Loasaceae | 8 |
| Mentzelia congesta | (Nutt.) Torr. & A.Gray | Loasaceae | 8 |
| Mentzelia dispersa | S.Watson | Loasaceae | 8 |
| Mentzelia inyoensis | H.J.Thomps. & Prigge | Loasaceae | 8 |
| Mentzelia laevicaulis | (Douglas ex Hook.) Torr. & A.Gray | Loasaceae | 8 |
| Mentzelia longiloba | J.Darl. | Loasaceae | 8 |
| Mentzelia montana | (Davidson) Davidson | Loasaceae | 8 |
| Mentzelia nitens | Greene | Loasaceae | 8 |
| Mentzelia oreophila | J.Darl. | 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 arizonica | Greene | Boraginaceae | 8 |
| Mertensia brevistyla | S.Watson | Boraginaceae | 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 nidifica | (Greene) Small | Saxifragaceae | 8 |
| Micranthes occidentalis | (S.Watson) Small | Saxifragaceae | 8 |
| Micranthes odontoloma | A.Heller | Saxifragaceae | 8 |
| Micranthes oregana | (Howell) Small | Saxifragaceae | 8 |
| Micranthes tolmiei | (Torr. & A.Gray) Brouillet & Gornall | Saxifragaceae | 8 |
| Micropuntia pulchella | (Engelm.) M.P.Griff. | Cactaceae | 8 |
| Microseris nutans | (Hook.) 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 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 oxybaphoides | (A.Gray) A.Gray | Nyctaginaceae | 8 |
| Moehringia lateriflora | (L.) Fenzl | Caryophyllaceae | 8 |
| Mohavea breviflora | Coville | Plantaginaceae | 8 |
| Mohavea confertiflora | (Benth.) Jeps. | Plantaginaceae | 8 |
| Mollugo verticillata | L. | Molluginaceae | 8 |
| Monardella breweri | A.Gray | Lamiaceae | 8 |
| Monardella odoratissima | Benth. | Lamiaceae | 8 |
| Moneses uniflora | (L.) A.Gray | Ericaceae | 8 |
| Monoptilon bellioides | H.M.Hall | Asteraceae | 8 |
| Montia chamissoi | (Ledeb. ex Spreng.) Greene | Montiaceae | 8 |
| Montia fontana | L. | 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 |
| Muhlenbergia asperifolia | (Nees & Meyen ex Trin.) Parodi | Poaceae | 8 |
| Muhlenbergia glomerata | (Willd.) Trin. | Poaceae | 8 |
| Muhlenbergia longiligula | Hitchc. | Poaceae | 8 |
| Muhlenbergia mexicana | (L.) Trin. | Poaceae | 8 |
| Muhlenbergia microsperma | Trin. | Poaceae | 8 |
| Muhlenbergia minutissima | (Steud.) Swallen | Poaceae | 8 |
| Muhlenbergia porteri | Scribn. | Poaceae | 8 |
| Muhlenbergia racemosa | (Michx.) Britton, Sterns & Poggenb. | Poaceae | 8 |
| Muhlenbergia richardsonis | (Trin.) Rydb. | Poaceae | 8 |
| Muhlenbergia rigens | (Benth.) Hitchc. | Poaceae | 8 |
| Muhlenbergia torreyi | (Kunth) Hitchc. ex Bush | 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 |
| Musineon divaricatum | (Pursh) Nutt. | Apiaceae | 8 |
| Myosotis laxa | Lehm. | Boraginaceae | 8 |
| Myriophyllum sibiricum | Kom. | Haloragaceae | 8 |
| Myriophyllum verticillatum | L. | Haloragaceae | 8 |
| Myriopteris covillei | (Maxon) Á.Löve & D.Löve | Pteridaceae | 8 |
| Myriopteris gracillima | J.Sm. | Pteridaceae | 8 |
| Myriopteris parryi | (D.C.Eaton) Grusz & Windham | Pteridaceae | 8 |
| Myriopteris wootonii | (Maxon) Grusz & Windham | Pteridaceae | 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 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 |
| Navarretia breweri | (A.Gray) Greene | Polemoniaceae | 8 |
| Navarretia capillaris | (Kellogg) Kuntze | Polemoniaceae | 8 |
| Navarretia divaricata | Greene | Polemoniaceae | 8 |
| Navarretia intertexta | Hook. | Polemoniaceae | 8 |
| Navarretia leptalea | (A.Gray) L.A.Johnson | Polemoniaceae | 8 |
| Navarretia leucocephala | Benth. | Polemoniaceae | 8 |
| Neltuma odorata | (Torr. & Frém.) C.E.Hughes & G.P.Lewis | Fabaceae | 8 |
| Nemacladus orientalis | (McVaugh) Morin | Campanulaceae | 8 |
| Nemacladus rubescens | Greene | Campanulaceae | 8 |
| Nemacladus sigmoideus | G.T.Robbins | Campanulaceae | 8 |
| Nemophila breviflora | A.Gray | Hydrophyllaceae | 8 |
| Nemophila menziesii | Hook. & Arn. | Hydrophyllaceae | 8 |
| Nemophila parviflora | Douglas ex Benth. | Hydrophyllaceae | 8 |
| Nemophila pedunculata | Douglas ex Benth. | Hydrophyllaceae | 8 |
| Neogaerrhinum filipes | (A.Gray) 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 convallarioides | (Sw.) Rich. | Orchidaceae | 8 |
| Nestotus stenophyllus | (A.Gray) R.P.Roberts, Urbatsch & Neubig | Asteraceae | 8 |
| Nicotiana attenuata | Torr. ex S.Watson | 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 |
| Nothocalais troximoides | (A.Gray) Greene | Asteraceae | 8 |
| Nuphar polysepala | Engelm. | Nymphaeaceae | 8 |
| Oenothera albicaulis | Nutt. ex Pursh | Onagraceae | 8 |
| Oenothera avita | (W.M.Klein) W.M.Klein | Onagraceae | 8 |
| Oenothera biennis | L. | Onagraceae | 8 |
| Oenothera cespitosa | Nutt. | Onagraceae | 8 |
| Oenothera curtiflora | W.L.Wagner & Hoch | Onagraceae | 8 |
| Oenothera deltoides | Torr. & Frém. | Onagraceae | 8 |
| Oenothera elata | Kunth | Onagraceae | 8 |
| Oenothera flava | (A.Nelson) Garrett | Onagraceae | 8 |
| Oenothera howardii | (A.Nelson) M.E.Jones ex Prain | Onagraceae | 8 |
| Oenothera pallida | Lindl. | Onagraceae | 8 |
| Oenothera primiveris | A.Gray | 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 |
| Olsynium douglasii | (A.Dietr.) E.P.Bicknell | Iridaceae | 8 |
| Opuntia basilaris | Engelm. & J.M.Bigelow | Cactaceae | 8 |
| Opuntia chlorotica | Engelm. & J.M.Bigelow | Cactaceae | 8 |
| Opuntia engelmannii | Salm-Dyck ex Engelm. | Cactaceae | 8 |
| Opuntia orbiculata | Salm-Dyck ex Pfeiff. | Cactaceae | 8 |
| Opuntia phaeacantha | Engelm. | Cactaceae | 8 |
| Opuntia polyacantha | Haw. | Cactaceae | 8 |
| Oreocarya abortiva | Greene | Boraginaceae | 8 |
| Oreocarya confertiflora | Greene | Boraginaceae | 8 |
| Oreocarya flavoculata | A.Nelson | Boraginaceae | 8 |
| Oreocarya fulvocanescens | (S.Watson) Greene | Boraginaceae | 8 |
| Oreocarya glomerata | Greene | Boraginaceae | 8 |
| Oreocarya hoffmannii | (I.M.Johnst.) Abrams | Boraginaceae | 8 |
| Oreocarya humilis | (A.Gray) Greene | Boraginaceae | 8 |
| Oreocarya setosissima | (A.Gray) Greene | Boraginaceae | 8 |
| Oreocarya spiculifera | Piper | Boraginaceae | 8 |
| Oreocarya suffruticosa | (Torr.) Greene | Boraginaceae | 8 |
| Oreochrysum parryi | Rydb. | Asteraceae | 8 |
| Oreostemma alpigenum | (Torr. & A.Gray) Greene | Asteraceae | 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 |
| Orthilia secunda | (L.) House | Ericaceae | 8 |
| Orthocarpus cuspidatus | Greene | Orobanchaceae | 8 |
| Orthocarpus luteus | Nutt. | Orobanchaceae | 8 |
| Oryctes nevadensis | S.Watson | Solanaceae | 8 |
| Osmorhiza berteroi | DC. | Apiaceae | 8 |
| Osmorhiza depauperata | Phil. | Apiaceae | 8 |
| Osmorhiza occidentalis | Torr. | Apiaceae | 8 |
| Oxalis pilosa | Nutt. | 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 |
| Oxytropis sericea | Nutt. | Fabaceae | 8 |
| Packera cana | (Hook.) W.A.Weber & Á.Löve | Asteraceae | 8 |
| Packera dimorphophylla | (Greene) W.A.Weber & Á.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 |
| Palafoxia arida | B.L.Turner & M.I.Morris | Asteraceae | 8 |
| Panicum capillare | L. | Poaceae | 8 |
| Panicum dichotomiflorum | Michx. | Poaceae | 8 |
| Panicum hirticaule | J.Presl | Poaceae | 8 |
| Panicum virgatum | L. | 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 |
| Parnassia fimbriata | K.D.Koenig | Celastraceae | 8 |
| Parnassia kotzebuei | Cham. ex Spreng. | Celastraceae | 8 |
| Parnassia palustris | L. | Celastraceae | 8 |
| Parnassia parviflora | DC. | Celastraceae | 8 |
| Paronychia sessiliflora | Nutt. | Caryophyllaceae | 8 |
| Parthenium incanum | Kunth | Asteraceae | 8 |
| Parthenocissus quinquefolia | (L.) Planch. | Vitaceae | 8 |
| Paspalum distichum | L. | Poaceae | 8 |
| Pectiantia pentandra | (Hook.) Rydb. | Saxifragaceae | 8 |
| Pectis papposa | Harv. & Gray | Asteraceae | 8 |
| Pectocarya heterocarpa | (I.M.Johnst.) I.M.Johnst. | Boraginaceae | 8 |
| Pectocarya penicillata | (Hook. & Arn.) A.DC. | Boraginaceae | 8 |
| Pectocarya platycarpa | (Munz & I.M.Johnst.) Munz & I.M.Johnst. | Boraginaceae | 8 |
| Pectocarya recurvata | I.M.Johnst. | Boraginaceae | 8 |
| Pectocarya setosa | A.Gray | Boraginaceae | 8 |
| Pedicularis attollens | A.Gray | Orobanchaceae | 8 |
| Pedicularis centranthera | A.Gray | Orobanchaceae | 8 |
| Pedicularis crenulata | Benth. | Orobanchaceae | 8 |
| Pedicularis groenlandica | Retz. | Orobanchaceae | 8 |
| Pedicularis semibarbata | A.Gray | Orobanchaceae | 8 |
| Pediocactus simpsonii | (Engelm.) Britton & Rose | Cactaceae | 8 |
| Pediomelum castoreum | (S.Watson) Rydb. | Fabaceae | 8 |
| Pediomelum megalanthum | (Wooton & Standl.) Rydb. | Fabaceae | 8 |
| Pediomelum tenuiflorum | (Pursh) A.N.Egan | Fabaceae | 8 |
| Pelecyphora vivipara | (Nutt.) D.Aquino & Dan.Sánchez | Cactaceae | 8 |
| Pellaea atropurpurea | (L.) Link | Pteridaceae | 8 |
| Pellaea bridgesii | Hook. | Pteridaceae | 8 |
| Pellaea glabella | Mett. | Pteridaceae | 8 |
| Pellaea mucronata | D.C.Eaton | Pteridaceae | 8 |
| Pellaea truncata | Goodd. | Pteridaceae | 8 |
| Penstemon acuminatus | Douglas ex Lindl. | Plantaginaceae | 8 |
| Penstemon albomarginatus | M.E.Jones | Plantaginaceae | 8 |
| Penstemon ambiguus | Torr. | Plantaginaceae | 8 |
| Penstemon arenarius | Greene | Plantaginaceae | 8 |
| Penstemon barnebyi | N.H.Holmgren | Plantaginaceae | 8 |
| Penstemon bicolor | (Brandegee) Clokey & D.D.Keck | Plantaginaceae | 8 |
| Penstemon calcareus | Brandegee | Plantaginaceae | 8 |
| Penstemon comarrhenus | A.Gray | Plantaginaceae | 8 |
| Penstemon confusus | M.E.Jones | Plantaginaceae | 8 |
| Penstemon davidsonii | Greene | Plantaginaceae | 8 |
| Penstemon deustus | Douglas | Plantaginaceae | 8 |
| Penstemon eatonii | A.Gray | Plantaginaceae | 8 |
| Penstemon fruticiformis | Coville | Plantaginaceae | 8 |
| Penstemon gracilentus | A.Gray | Plantaginaceae | 8 |
| Penstemon heterodoxus | A.Gray | Plantaginaceae | 8 |
| Penstemon humilis | Nutt. ex A.Gray | Plantaginaceae | 8 |
| Penstemon janishiae | N.H.Holmgren | Plantaginaceae | 8 |
| Penstemon kingii | S.Watson | Plantaginaceae | 8 |
| Penstemon leiophyllus | Pennell | Plantaginaceae | 8 |
| Penstemon leonardii | Rydb. | Plantaginaceae | 8 |
| Penstemon linarioides | A.Gray | Plantaginaceae | 8 |
| Penstemon newberryi | A.Gray | Plantaginaceae | 8 |
| Penstemon pachyphyllus | A.Gray ex Rydb. | Plantaginaceae | 8 |
| Penstemon palmeri | A.Gray | Plantaginaceae | 8 |
| Penstemon patens | (M.E.Jones) N.H.Holmgren | Plantaginaceae | 8 |
| Penstemon petiolatus | Brandegee | Plantaginaceae | 8 |
| Penstemon pratensis | Greene | Plantaginaceae | 8 |
| Penstemon procerus | Douglas ex Graham | Plantaginaceae | 8 |
| Penstemon radicosus | A.Nelson | Plantaginaceae | 8 |
| Penstemon roezlii | Regel | Plantaginaceae | 8 |
| Penstemon rostriflorus | Kellogg | Plantaginaceae | 8 |
| Penstemon rydbergii | A.Nelson | Plantaginaceae | 8 |
| Penstemon speciosus | Douglas | 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 watsonii | A.Gray | Plantaginaceae | 8 |
| Peraphyllum ramosissimum | Nutt. | Rosaceae | 8 |
| Pericome caudata | A.Gray | Asteraceae | 8 |
| Perideridia bolanderi | A.Nelson & J.F.Macbr. | Apiaceae | 8 |
| Perityle emoryi | Torr. | Asteraceae | 8 |
| Perityle megalocephala | (S.Watson) J.F.Macbr. | Asteraceae | 8 |
| Perityle tenella | J.F.Macbr. | Asteraceae | 8 |
| Persicaria amphibia | (L.) Delarbre | Polygonaceae | 8 |
| Persicaria lapathifolia | (L.) Delarbre | Polygonaceae | 8 |
| Persicaria pensylvanica | (L.) M.Gómez | Polygonaceae | 8 |
| Persicaria vivipara | (L.) Ronse Decr. | Polygonaceae | 8 |
| Petalonyx nitidus | S.Watson | Loasaceae | 8 |
| Petalonyx thurberi | A.Gray | Loasaceae | 8 |
| Peteria scoparia | A.Gray | Fabaceae | 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 calthifolia | Brand | Hydrophyllaceae | 8 |
| Phacelia cicutaria | Greene | Hydrophyllaceae | 8 |
| Phacelia corrugata | A.Nelson | 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 fremontii | Torr. | Hydrophyllaceae | 8 |
| Phacelia glandulifera | Piper | Hydrophyllaceae | 8 |
| Phacelia gymnoclada | Torr. ex S.Watson | Hydrophyllaceae | 8 |
| Phacelia hastata | Douglas ex Lehm. | Hydrophyllaceae | 8 |
| Phacelia heterophylla | Pursh | Hydrophyllaceae | 8 |
| Phacelia humilis | Torr. & A.Gray | Hydrophyllaceae | 8 |
| Phacelia hydrophylloides | Torr. ex A.Gray | Hydrophyllaceae | 8 |
| Phacelia incana | Brand | Hydrophyllaceae | 8 |
| Phacelia inundata | J.T.Howell | Hydrophyllaceae | 8 |
| Phacelia ivesiana | Torr. | Hydrophyllaceae | 8 |
| Phacelia linearis | (Pursh) Holz. | Hydrophyllaceae | 8 |
| Phacelia lutea | (Hook. & Arn.) J.T.Howell | Hydrophyllaceae | 8 |
| Phacelia monoensis | Halse | Hydrophyllaceae | 8 |
| Phacelia neglecta | M.E.Jones | Hydrophyllaceae | 8 |
| Phacelia palmeri | Torr. | Hydrophyllaceae | 8 |
| Phacelia pedicellata | A.Gray | Hydrophyllaceae | 8 |
| Phacelia peirsoniana | J.T.Howell | Hydrophyllaceae | 8 |
| Phacelia procera | A.Gray | Hydrophyllaceae | 8 |
| Phacelia pulchella | A.Gray | 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 tanacetifolia | Benth. | Hydrophyllaceae | 8 |
| Phacelia vallis-mortae | J.W.Voss | Hydrophyllaceae | 8 |
| Phalaris arundinacea | L. | Poaceae | 8 |
| Phalaris caroliniana | Walter | Poaceae | 8 |
| Philadelphus microphyllus | A.Gray | Hydrangeaceae | 8 |
| Phleum alpinum | L. | Poaceae | 8 |
| Phlox austromontana | Coville | Polemoniaceae | 8 |
| Phlox condensata | (A.Gray) E.E.Nelson | Polemoniaceae | 8 |
| Phlox diffusa | Benth. | Polemoniaceae | 8 |
| Phlox griseola | Wherry | Polemoniaceae | 8 |
| Phlox hoodii | Richardson | Polemoniaceae | 8 |
| Phlox longifolia | Nutt. | Polemoniaceae | 8 |
| Phlox multiflora | A.Nelson | Polemoniaceae | 8 |
| Phlox pulvinata | (Wherry) Cronquist | Polemoniaceae | 8 |
| Phlox speciosa | Pursh | Polemoniaceae | 8 |
| Phoenicaulis cheiranthoides | Nutt. | Brassicaceae | 8 |
| Pholistoma auritum | (Lindl.) Lilja | Hydrophyllaceae | 8 |
| Pholistoma membranaceum | (Benth.) Constance | Hydrophyllaceae | 8 |
| Phoradendron californicum | Nutt. | Santalaceae | 8 |
| Phoradendron juniperinum | Engelm. ex A.Gray | Santalaceae | 8 |
| Phragmites australis | (Cav.) Steud. | Poaceae | 8 |
| Phyla lanceolata | (Michx.) Greene | Verbenaceae | 8 |
| Phyla nodiflora | (L.) Greene | Verbenaceae | 8 |
| Phyllodoce breweri | (A.Gray) A.Heller | Ericaceae | 8 |
| Physalis crassifolia | Benth. | Solanaceae | 8 |
| Physalis fendleri | A.Gray | Solanaceae | 8 |
| Physalis hederifolia | A.Gray | Solanaceae | 8 |
| Physalis longifolia | Nutt. | Solanaceae | 8 |
| Physaria acutifolia | Rydb. | Brassicaceae | 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 malvaceus | (Greene) Kuntze | Rosaceae | 8 |
| Physocarpus monogynus | (Torr.) J.M.Coult. | Rosaceae | 8 |
| Picea engelmannii | Parry ex Engelm. | Pinaceae | 8 |
| Picrothamnus desertorum | Nutt. | Asteraceae | 8 |
| Pilostyles thurberi | A.Gray | Apodanthaceae | 8 |
| Pinus albicaulis | Engelm. | Pinaceae | 8 |
| Pinus contorta | Douglas ex Loudon | 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 ponderosa | Douglas ex C.Lawson | Pinaceae | 8 |
| Piptatheropsis exigua | (Thurb.) Romasch., P.M.Peterson & Soreng | Poaceae | 8 |
| Piptatheropsis micrantha | (Trin. & Rupr.) Romasch., P.M.Peterson & Soreng | Poaceae | 8 |
| Plagiobothrys arizonicus | (A.Gray) Greene ex A.Gray | Boraginaceae | 8 |
| Plagiobothrys nothofulvus | (A.Gray) A.Gray | 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 |
| Plantago ovata | Forssk. | Plantaginaceae | 8 |
| Plantago patagonica | Jacq. | Plantaginaceae | 8 |
| Platanthera dilatata | (Pursh) Lindl. ex L.C.Beck | Orchidaceae | 8 |
| Platanthera sparsiflora | (S.Watson) Schltr. | Orchidaceae | 8 |
| Platanthera tescamnis | Sheviak & W.F.Jenn. | Orchidaceae | 8 |
| Platanthera unalascensis | (Spreng.) Kurtz | Orchidaceae | 8 |
| Platystemon californicus | Benth. | Papaveraceae | 8 |
| Pleiacanthus spinosus | (Nutt.) Rydb. | Asteraceae | 8 |
| Pleurocoronis pluriseta | (A.Gray) R.M.King & H.Rob. | Asteraceae | 8 |
| Pluchea odorata | (L.) Cass. | Asteraceae | 8 |
| Pluchea sericea | (Nutt.) Coville | Asteraceae | 8 |
| Poa alpina | L. | Poaceae | 8 |
| Poa arctica | R.Br. | Poaceae | 8 |
| Poa bigelovii | Vasey ex Scribn. | Poaceae | 8 |
| Poa cusickii | Vasey | Poaceae | 8 |
| Poa fendleriana | (Steud.) Vasey | Poaceae | 8 |
| Poa glauca | Vahl | Poaceae | 8 |
| Poa interior | Rydb. | Poaceae | 8 |
| Poa nemoralis | L. | Poaceae | 8 |
| Poa palustris | L. | Poaceae | 8 |
| Poa pratensis | L. | Poaceae | 8 |
| Poa secunda | J.Presl | Poaceae | 8 |
| Poa wheeleri | Vasey | Poaceae | 8 |
| Polemonium californicum | Eastw. | Polemoniaceae | 8 |
| Polemonium chartaceum | H.Mason | Polemoniaceae | 8 |
| Polemonium foliosissimum | A.Gray | Polemoniaceae | 8 |
| Polemonium micranthum | Benth. | Polemoniaceae | 8 |
| Polemonium occidentale | Greene | Polemoniaceae | 8 |
| Polemonium pulcherrimum | Hook. | Polemoniaceae | 8 |
| Polemonium viscosum | Nutt. | Polemoniaceae | 8 |
| Polyctenium fremontii | Greene | Brassicaceae | 8 |
| Polygonum achoreum | S.F.Blake | Polygonaceae | 8 |
| Polygonum aviculare | L. | Polygonaceae | 8 |
| Polygonum minimum | S.Watson | Polygonaceae | 8 |
| Polygonum shastense | Brewer | Polygonaceae | 8 |
| Polypogon interruptus | Kunth | Poaceae | 8 |
| Polystichum kruckebergii | W.H.Wagner | Dryopteridaceae | 8 |
| Polystichum lonchitis | (L.) Roth | Dryopteridaceae | 8 |
| Polystichum scopulinum | (D.C.Eaton) Maxon | Dryopteridaceae | 8 |
| Populus angustifolia | E.James | Salicaceae | 8 |
| Populus fremontii | S.Watson | Salicaceae | 8 |
| Populus tremuloides | Michx. | Salicaceae | 8 |
| Porterella carnosula | (Hook. & Arn.) Torr. | Campanulaceae | 8 |
| Portulaca halimoides | L. | Portulacaceae | 8 |
| Potamogeton alpinus | Balb. | Potamogetonaceae | 8 |
| Potamogeton berchtoldii | Fieber | Potamogetonaceae | 8 |
| Potamogeton diversifolius | Raf. | Potamogetonaceae | 8 |
| Potamogeton foliosus | Raf. | Potamogetonaceae | 8 |
| Potamogeton gramineus | L. | Potamogetonaceae | 8 |
| Potamogeton natans | L. | Potamogetonaceae | 8 |
| Potamogeton nodosus | Poir. | Potamogetonaceae | 8 |
| Potamogeton pusillus | L. | Potamogetonaceae | 8 |
| Potamogeton richardsonii | Rydb. | Potamogetonaceae | 8 |
| Potamogeton zosteriformis | Fernald | Potamogetonaceae | 8 |
| Potentilla biennis | Greene | Rosaceae | 8 |
| Potentilla brevifolia | Nutt. | Rosaceae | 8 |
| Potentilla breweri | S.Watson | Rosaceae | 8 |
| Potentilla concinna | Richardson | Rosaceae | 8 |
| Potentilla crinita | A.Gray | Rosaceae | 8 |
| Potentilla douglasii | Greene | 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 hippiana | Lehm. | Rosaceae | 8 |
| Potentilla hispidula | (Rydb.) Jeps. | Rosaceae | 8 |
| Potentilla jaegeri | (Munz & I.M.Johnst.) L.C.Wheeler | Rosaceae | 8 |
| Potentilla johnstonii | Soják | Rosaceae | 8 |
| Potentilla litoralis | Rydb. | Rosaceae | 8 |
| Potentilla lycopodioides | (A.Gray) Baill. ex J.T.Howell | Rosaceae | 8 |
| Potentilla millefolia | Rydb. | Rosaceae | 8 |
| Potentilla newberryi | A.Gray | Rosaceae | 8 |
| Potentilla norvegica | L. | Rosaceae | 8 |
| Potentilla ovina | Macoun | Rosaceae | 8 |
| Potentilla pensylvanica | L. | Rosaceae | 8 |
| Potentilla pulcherrima | Lehm. | Rosaceae | 8 |
| Potentilla rivalis | Nutt. | Rosaceae | 8 |
| Potentilla sabulosa | M.E.Jones | Rosaceae | 8 |
| Potentilla webberi | (A.Gray) Greene | Rosaceae | 8 |
| Prenanthella exigua | (A.Gray) Rydb. | Asteraceae | 8 |
| Primula conjugens | (Greene) A.R.Mast & Reveal | Primulaceae | 8 |
| Primula fragrans | A.R.Mast & Reveal | Primulaceae | 8 |
| Primula incana | M.E.Jones | Primulaceae | 8 |
| Primula parryi | A.Gray | Primulaceae | 8 |
| Primula pauciflora | (Greene) A.R.Mast & Reveal | Primulaceae | 8 |
| Primula tetrandra | (Suksd.) A.R.Mast & Reveal | Primulaceae | 8 |
| Proboscidea parviflora | (Wooton) Wooton & Standl. | Martyniaceae | 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 virginiana | L. | Rosaceae | 8 |
| Psathyrotes annua | (Nutt.) A.Gray | Asteraceae | 8 |
| Psathyrotes pilifera | A.Gray | Asteraceae | 8 |
| Psathyrotes ramosissima | A.Gray | Asteraceae | 8 |
| Pseudognaphalium canescens | (DC.) Anderb. | Asteraceae | 8 |
| Pseudognaphalium stramineum | (Kunth) Anderb. | Asteraceae | 8 |
| Pseudoroegneria spicata | (Pursh) Á.Löve | Poaceae | 8 |
| Pseudotsuga menziesii | (Mirb.) Franco | Pinaceae | 8 |
| Psilocarphus brevissimus | Nutt. | Asteraceae | 8 |
| Psilostrophe cooperi | (A.Gray) Greene | Asteraceae | 8 |
| Psorodendron fremontii | (Torr. ex A.Gray) Rydb. | Fabaceae | 8 |
| Psorodendron kingii | (S.Watson) Rydb. | Fabaceae | 8 |
| Psorodendron spinosum | (A.Gray) Rydb. | Fabaceae | 8 |
| Psorothamnus polydenius | (Torr.) Rydb. | Fabaceae | 8 |
| Pteridium aquilinum | (L.) Kuhn | Dennstaedtiaceae | 8 |
| Pterospora andromedea | Nutt. | Ericaceae | 8 |
| Pterostegia drymarioides | Fisch. & C.A.Mey. | Polygonaceae | 8 |
| Puccinellia lemmonii | (Vasey) Scribn. | Poaceae | 8 |
| Puccinellia nuttalliana | (Schult.) Hitchc. | Poaceae | 8 |
| Purshia glandulosa | Curran | Rosaceae | 8 |
| Purshia stansburyana | (Torr.) Henrickson | Rosaceae | 8 |
| Purshia tridentata | (Pursh) DC. | Rosaceae | 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 chrysolepis | Liebm. | Fagaceae | 8 |
| Quercus gambelii | Nutt. | Fagaceae | 8 |
| Quercus turbinella | Greene | 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 scaposa | A.Gray | Asteraceae | 8 |
| Ranunculus adoneus | A.Gray | Ranunculaceae | 8 |
| Ranunculus alismifolius | Geyer ex Benth. | Ranunculaceae | 8 |
| Ranunculus andersonii | A.Gray | Ranunculaceae | 8 |
| Ranunculus eschscholtzii | Schltdl. | Ranunculaceae | 8 |
| Ranunculus flabellaris | Raf. | Ranunculaceae | 8 |
| Ranunculus flammula | L. | Ranunculaceae | 8 |
| Ranunculus glaberrimus | Hook. | Ranunculaceae | 8 |
| Ranunculus gmelinii | DC. | Ranunculaceae | 8 |
| Ranunculus hyperboreus | Rottb. | Ranunculaceae | 8 |
| Ranunculus inamoenus | Greene | Ranunculaceae | 8 |
| Ranunculus macounii | Britton | Ranunculaceae | 8 |
| Ranunculus occidentalis | Nutt. | Ranunculaceae | 8 |
| Ranunculus orthorhynchus | Hook. | Ranunculaceae | 8 |
| Ranunculus sceleratus | L. | Ranunculaceae | 8 |
| Ranunculus trichophyllus | Chaix | Ranunculaceae | 8 |
| Ranunculus uncinatus | D.Don ex G.Don | Ranunculaceae | 8 |
| Rhamnus crocea | Nutt. | Rhamnaceae | 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 |
| Rhus aromatica | Aiton | Anacardiaceae | 8 |
| Rhus glabra | L. | Anacardiaceae | 8 |
| Rhysopterus plurijugus | J.M.Coult. & Rose | Apiaceae | 8 |
| Ribes aureum | Pursh | Grossulariaceae | 8 |
| Ribes cereum | Douglas | Grossulariaceae | 8 |
| Ribes hudsonianum | Richardson | Grossulariaceae | 8 |
| Ribes inerme | Rydb. | Grossulariaceae | 8 |
| Ribes lacustre | (Pers.) Poir. | Grossulariaceae | 8 |
| Ribes montigenum | McClatchie | Grossulariaceae | 8 |
| Ribes nevadense | Kellogg | Grossulariaceae | 8 |
| Ribes oxyacanthoides | L. | Grossulariaceae | 8 |
| Ribes roezlii | Regel | Grossulariaceae | 8 |
| Ribes velutinum | Greene | Grossulariaceae | 8 |
| Ribes viscosissimum | Pursh | Grossulariaceae | 8 |
| Rigiopappus leptocladus | A.Gray | Asteraceae | 8 |
| Robinia neomexicana | A.Gray | Fabaceae | 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 woodsii | Lindl. | Rosaceae | 8 |
| Rubus idaeus | L. | Rosaceae | 8 |
| Rubus leucodermis | (Douglas ex Hook.) Douglas ex Torr. & A.Gray | Rosaceae | 8 |
| Rubus parviflorus | Nutt. | Rosaceae | 8 |
| Rudbeckia occidentalis | Nutt. | Asteraceae | 8 |
| Rumex californicus | 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 triangulivalvis | (Danser) Rech.f. | Polygonaceae | 8 |
| Rumex venosus | Pursh | Polygonaceae | 8 |
| Ruppia cirrhosa | (Petagna) Grande | Ruppiaceae | 8 |
| Sabulina nuttallii | (Pax) Dillenb. & Kadereit | Caryophyllaceae | 8 |
| Sabulina rubella | (Wahlenb.) Dillenb. & Kadereit | Caryophyllaceae | 8 |
| Sagina saginoides | (L.) H.Karst. | Caryophyllaceae | 8 |
| Sagittaria cuneata | E.Sheld. | Alismataceae | 8 |
| Sairocarpus kingii | (S.Watson) D.A.Sutton | Plantaginaceae | 8 |
| Salicornia rubra | A.Nelson | Chenopodiaceae | 8 |
| Salix amygdaloides | Andersson | Salicaceae | 8 |
| Salix bebbiana | Sarg. | Salicaceae | 8 |
| Salix boothii | Dorn | 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 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 wolfii | Bebb | Salicaceae | 8 |
| Salvia columbariae | Benth. | Lamiaceae | 8 |
| Salvia dorrii | (Kellogg) Abrams | Lamiaceae | 8 |
| Salvia funerea | M.E.Jones | Lamiaceae | 8 |
| Salvia mohavensis | Greene | Lamiaceae | 8 |
| Salvia pachyphylla | Epling ex Munz | Lamiaceae | 8 |
| Sambucus cerulea | Raf. | Viburnaceae | 8 |
| Sambucus racemosa | L. | Viburnaceae | 8 |
| Samolus ebracteatus | Kunth | Primulaceae | 8 |
| Samolus parviflorus | Raf. | Primulaceae | 8 |
| Sanguisorba occidentalis | Nutt. | Rosaceae | 8 |
| Sanicula graveolens | Poepp. ex DC. | Apiaceae | 8 |
| Sarcobatus baileyi | Coville | Sarcobataceae | 8 |
| Sarcobatus vermiculatus | (Hook.) Torr. | Sarcobataceae | 8 |
| Sarcodes sanguinea | Torr. | Ericaceae | 8 |
| Saxifraga adscendens | L. | Saxifragaceae | 8 |
| Saxifraga cernua | L. | Saxifragaceae | 8 |
| Saxifraga cespitosa | L. | Saxifragaceae | 8 |
| Sceptridium multifidum | (S.G.Gmel.) M.Nishida | Ophioglossaceae | 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 pungens | (Vahl) Palla | 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 |
| Sclerocactus nyensis | Hochstätter | Cactaceae | 8 |
| Sclerocactus polyancistrus | (Engelm. & J.M.Bigelow) Britton & Rose | Cactaceae | 8 |
| Scopulophila rixfordii | (Brandegee) Munz & I.M.Johnst. | Caryophyllaceae | 8 |
| Scrophularia desertorum | (Munz) R.J.Shaw | Scrophulariaceae | 8 |
| Scrophularia lanceolata | Pursh | Scrophulariaceae | 8 |
| Scutellaria angustifolia | Pursh | Lamiaceae | 8 |
| Scutellaria mexicana | (Torr.) A.J.Paton | Lamiaceae | 8 |
| Scutellaria nana | A.Gray | Lamiaceae | 8 |
| Sedum debile | S.Watson | Crassulaceae | 8 |
| Sedum lanceolatum | Torr. | Crassulaceae | 8 |
| Sedum obtusatum | A.Gray | Crassulaceae | 8 |
| Selaginella leucobryoides | Maxon | Selaginellaceae | 8 |
| Selaginella scopulorum | Maxon | Selaginellaceae | 8 |
| Selaginella spinulosa | A.Braun ex Döll | Selaginellaceae | 8 |
| Selaginella utahensis | Flowers | Selaginellaceae | 8 |
| Selaginella watsonii | Underw. | Selaginellaceae | 8 |
| Senecio amplectens | A.Gray | Asteraceae | 8 |
| Senecio crassulus | A.Gray | 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 |
| 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 |
| Sibbaldia procumbens | L. | Rosaceae | 8 |
| Sidalcea candida | A.Gray | Malvaceae | 8 |
| Sidalcea glaucescens | Greene | Malvaceae | 8 |
| Sidalcea neomexicana | A.Gray | Malvaceae | 8 |
| Sidalcea oregana | (Nutt. ex Torr. & A.Gray) A.Gray | Malvaceae | 8 |
| Silene acaulis | (L.) Jacq. | Caryophyllaceae | 8 |
| Silene antirrhina | L. | Caryophyllaceae | 8 |
| Silene bernardina | S.Watson | Caryophyllaceae | 8 |
| Silene douglasii | Hook. | Caryophyllaceae | 8 |
| Silene drummondii | Hook. | Caryophyllaceae | 8 |
| Silene menziesii | Hook. | Caryophyllaceae | 8 |
| Silene oregana | S.Watson | Caryophyllaceae | 8 |
| Silene petersonii | Maguire | Caryophyllaceae | 8 |
| Silene sargentii | S.Watson | Caryophyllaceae | 8 |
| Silene verecunda | S.Watson | Caryophyllaceae | 8 |
| Simpsonanthus jonesii | (A.Gray) Guilliams, Hasenstab & B.G.Baldwin | Boraginaceae | 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 |
| Smelowskia americana | Rydb. | Brassicaceae | 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 elongata | Nutt. | Asteraceae | 8 |
| Solidago gigantea | Aiton | Asteraceae | 8 |
| Solidago lepida | DC. | Asteraceae | 8 |
| Solidago missouriensis | Nutt. | Asteraceae | 8 |
| Solidago velutina | DC. | Asteraceae | 8 |
| Sonnea glomerata | (A.Gray) Greene | Boraginaceae | 8 |
| Sorbus californica | Greene | Rosaceae | 8 |
| Sorbus scopulina | Greene | Rosaceae | 8 |
| Sparganium angustifolium | Michx. | Typhaceae | 8 |
| Sparganium emersum | Rehmann | Typhaceae | 8 |
| Sparganium eurycarpum | Engelm. | Typhaceae | 8 |
| Spergularia marina | (L.) Besser | Caryophyllaceae | 8 |
| Sphaeralcea ambigua | A.Gray | Malvaceae | 8 |
| Sphaeralcea emoryi | Torr. ex A.Gray | Malvaceae | 8 |
| Sphaeralcea grossulariifolia | (Hook. & Arn.) Rydb. | Malvaceae | 8 |
| Sphaeralcea leptophylla | (A.Gray) Rydb. | Malvaceae | 8 |
| Sphaeralcea munroana | (Douglas ex Lindl.) Spach | Malvaceae | 8 |
| Sphaeralcea parvifolia | A.Nelson | Malvaceae | 8 |
| Sphenopholis intermedia | (Rydb.) Rydb. | Poaceae | 8 |
| Sphenopholis obtusata | (Michx.) Scribn. | Poaceae | 8 |
| Spiranthes diluvialis | Sheviak | 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 cryptandrus | (Torr.) A.Gray | Poaceae | 8 |
| Sporobolus hookerianus | P.M.Peterson & Saarela | Poaceae | 8 |
| Sporobolus nealleyi | Vasey | Poaceae | 8 |
| Stachys pilosa | Nutt. | Lamiaceae | 8 |
| Stachys rigida | Nutt. ex Benth. | Lamiaceae | 8 |
| Stanleya elata | M.E.Jones | Brassicaceae | 8 |
| Stanleya pinnata | (Pursh) Britton | Brassicaceae | 8 |
| Stanleya viridiflora | Nutt. | Brassicaceae | 8 |
| Stellaria borealis | Bigelow | Caryophyllaceae | 8 |
| Stellaria longifolia | Muhl. ex Willd. | Caryophyllaceae | 8 |
| Stellaria nitens | Nutt. | Caryophyllaceae | 8 |
| Stenotus acaulis | (Nutt.) Nutt. | Asteraceae | 8 |
| Stephanomeria exigua | Nutt. | 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 cooperi | (S.Watson) Al-Shehbaz | Brassicaceae | 8 |
| Streptanthus cordatus | Nutt. | Brassicaceae | 8 |
| Streptanthus crassicaulis | Torr. | Brassicaceae | 8 |
| Streptanthus glaucus | Jeps. | Brassicaceae | 8 |
| Streptanthus lasiophyllus | Hook. & Arn. ex Hoover | Brassicaceae | 8 |
| Streptanthus longirostris | (S.Watson) S.Watson | Brassicaceae | 8 |
| Streptanthus pilosus | Jeps. | Brassicaceae | 8 |
| Streptanthus tortuosus | Kellogg | Brassicaceae | 8 |
| Strombocarpa pubescens | (Benth.) A.Gray | Fabaceae | 8 |
| Stuckenia filiformis | (Pers.) Börner | Potamogetonaceae | 8 |
| Stuckenia pectinata | (L.) Börner | Potamogetonaceae | 8 |
| Stylocline micropoides | A.Gray | Asteraceae | 8 |
| Stylocline psilocarphoides | M.Peck | Asteraceae | 8 |
| Suaeda calceoliformis | (Hook.) Moq. | Chenopodiaceae | 8 |
| Suaeda nigra | (Raf.) J.F.Macbr. | Chenopodiaceae | 8 |
| Swertia perennis | L. | Gentianaceae | 8 |
| Symphoricarpos longiflorus | A.Gray | Caprifoliaceae | 8 |
| Symphoricarpos mollis | Nutt. | 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 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 |
| Taraxia subacaulis | Rydb. | Onagraceae | 8 |
| Taraxia tanacetifolia | (Torr. & A.Gray) Piper | Onagraceae | 8 |
| Telesonix heucheriformis | Rydb. | Saxifragaceae | 8 |
| Tetracoccus hallii | Brandegee | Picrodendraceae | 8 |
| Tetradymia axillaris | A.Nelson | Asteraceae | 8 |
| Tetradymia canescens | DC. | 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 |
| 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 revolutum | DC. | Ranunculaceae | 8 |
| Thalictrum sparsiflorum | Turcz. ex Fisch. & C.A.Mey. | Ranunculaceae | 8 |
| Thalictrum venulosum | Trel. | Ranunculaceae | 8 |
| Thamnosma montana | Torr. & Frém. | Rutaceae | 8 |
| Thelesperma subnudum | A.Gray | Asteraceae | 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 montana | Nutt. | Fabaceae | 8 |
| Thymophylla acerosa | (DC.) Strother | Asteraceae | 8 |
| Thymophylla pentachaeta | (DC.) Small | Asteraceae | 8 |
| Thysanocarpus curvipes | Hook. | Brassicaceae | 8 |
| Tidestromia suffruticosa | (Torr.) Standl. | Amaranthaceae | 8 |
| Tiquilia canescens | (DC.) A.T.Richardson | Ehretiaceae | 8 |
| Tiquilia latior | (I.M.Johnst.) 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 |
| 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 |
| Tonestus lyallii | A.Nelson | Asteraceae | 8 |
| Torreyostellaria jamesiana | (Torr.) Gang Yao, B.Xue & Z.Q.Song | Caryophyllaceae | 8 |
| Townsendia exscapa | (Richardson) Porter | Asteraceae | 8 |
| Townsendia incana | Nutt. | Asteraceae | 8 |
| Townsendia parryi | Eaton | Asteraceae | 8 |
| Townsendia scapigera | D.C.Eaton | Asteraceae | 8 |
| Toxicodendron diversilobum | (Torr. & A.Gray) Greene | Anacardiaceae | 8 |
| Toxicodendron radicans | (L.) Kuntze | Anacardiaceae | 8 |
| Toxicoscordion paniculatum | (Nutt.) Rydb. | Melanthiaceae | 8 |
| Toxicoscordion venenosum | (S.Watson) Rydb. | Melanthiaceae | 8 |
| Tragia ramosa | Torr. | Euphorbiaceae | 8 |
| Trianthema portulacastrum | L. | Aizoaceae | 8 |
| Tricardia watsonii | Torr. ex S.Watson | Hydrophyllaceae | 8 |
| Trichogalium boreale | (L.) Fourr. | Rubiaceae | 8 |
| Trichogalium multiflorum | (Kellogg) Kadereit & Schneew. | Rubiaceae | 8 |
| Trichoptilium incisum | (A.Gray) A.Gray | Asteraceae | 8 |
| Tridentopsis mutica | (Torr.) P.M.Peterson | Poaceae | 8 |
| Trifolium andersonii | A.Gray | Fabaceae | 8 |
| Trifolium beckwithii | W.H.Brewer ex S.Watson | Fabaceae | 8 |
| Trifolium cyathiferum | Lindl. | Fabaceae | 8 |
| Trifolium eriocephalum | Nutt. | Fabaceae | 8 |
| Trifolium gracilentum | Torr. & A.Gray | Fabaceae | 8 |
| Trifolium gymnocarpon | Nutt. | Fabaceae | 8 |
| Trifolium kingii | S.Watson | Fabaceae | 8 |
| Trifolium lemmonii | S.Watson | Fabaceae | 8 |
| Trifolium longipes | Nutt. | Fabaceae | 8 |
| Trifolium macrocephalum | (Pursh) Poir. | Fabaceae | 8 |
| Trifolium microcephalum | Pursh | Fabaceae | 8 |
| Trifolium monanthum | A.Gray | Fabaceae | 8 |
| Trifolium productum | Greene | Fabaceae | 8 |
| Trifolium variegatum | Nutt. | Fabaceae | 8 |
| Trifolium wormskioldii | Lehm. | Fabaceae | 8 |
| Triglochin maritima | L. | Juncaginaceae | 8 |
| Triglochin palustris | L. | Juncaginaceae | 8 |
| Triglochin scilloides | (Poir.) Mering & Kadereit | Juncaginaceae | 8 |
| Triodanis perfoliata | (L.) Nieuwl. | Campanulaceae | 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 |
| 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 myrtillus | L. | Ericaceae | 8 |
| Vaccinium scoparium | Leiberg ex Coville | Ericaceae | 8 |
| Vaccinium uliginosum | L. | Ericaceae | 8 |
| Valeriana acutiloba | Rydb. | Caprifoliaceae | 8 |
| Valeriana californica | A.Heller | Caprifoliaceae | 8 |
| Valeriana dioica | L. | Caprifoliaceae | 8 |
| Valeriana edulis | Nutt. | Caprifoliaceae | 8 |
| Valeriana macrocera | (Torr. & A.Gray) Byng & Christenh. | Caprifoliaceae | 8 |
| Valeriana occidentalis | A.Heller | Caprifoliaceae | 8 |
| Vallisneria americana | Michx. | Hydrocharitaceae | 8 |
| Veratrum californicum | Durand | Melanthiaceae | 8 |
| Verbena bracteata | Cav. ex Lag. & Rodr. | Verbenaceae | 8 |
| Verbena canescens | Kunth | Verbenaceae | 8 |
| Verbena gooddingii | Briq. | Verbenaceae | 8 |
| Verbena macdougalii | A.Heller | Verbenaceae | 8 |
| Verbena stricta | Vent. | Verbenaceae | 8 |
| Veronica americana | (Raf.) Schwein. ex Benth. | Plantaginaceae | 8 |
| Veronica catenata | Pennell | Plantaginaceae | 8 |
| Veronica peregrina | L. | 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 |
| Vicia americana | Muhl. ex Willd. | Fabaceae | 8 |
| Vicia ludoviciana | Nutt. | Fabaceae | 8 |
| Viola adunca | Sm. | Violaceae | 8 |
| Viola bakeri | Greene | Violaceae | 8 |
| Viola macloskeyi | F.E.Lloyd | Violaceae | 8 |
| Viola nephrophylla | Greene | Violaceae | 8 |
| Viola praemorsa | Douglas | Violaceae | 8 |
| Viola purpurea | Kellogg | Violaceae | 8 |
| Vitis arizonica | Engelm. | Vitaceae | 8 |
| Woodsia oregana | D.C.Eaton | Woodsiaceae | 8 |
| Woodsia scopulina | D.C.Eaton | Woodsiaceae | 8 |
| Woodwardia fimbriata | Sm. | Blechnaceae | 8 |
| Wyethia amplexicaulis | (Nutt.) Nutt. | Asteraceae | 8 |
| Wyethia mollis | A.Gray | Asteraceae | 8 |
| Xanthisma gracile | (Nutt.) D.R.Morgan & R.L.Hartm. | Asteraceae | 8 |
| Xanthisma grindelioides | (Nutt.) 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 |
| 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 harrimaniae | Trel. | Asparagaceae | 8 |
| Yucca schidigera | Roezl ex Ortgies | Asparagaceae | 8 |
| Yucca utahensis | McKelvey | Asparagaceae | 8 |
| Zannichellia palustris | L. | Potamogetonaceae | 8 |
| Zeltnera arizonica | (A.Gray) G.Mans. | Gentianaceae | 8 |
| Zeltnera exaltata | (Griseb.) G.Mans. | Gentianaceae | 8 |
| Zeltnera namatophila | (Reveal, C.R.Broome & Beatley) G.Mans. | Gentianaceae | 8 |
| Zizia aptera | (A.Gray) Fernald | Apiaceae | 8 |
| Agoseris monticola | Greene | Asteraceae | 7 |
| Antennaria flagellaris | A.Gray | Asteraceae | 7 |
| Astragalus anserinus | N.D.Atwood, Goodrich & S.L.Welsh | Fabaceae | 7 |
| Astragalus pulsiferae | A.Gray | Fabaceae | 7 |
| Boechera xylopoda | Windham & Al-Shehbaz | Brassicaceae | 7 |
| Bromus marginatus | Nees ex Steud. | Poaceae | 7 |
| Castilleja peckiana | Pennell | Orobanchaceae | 7 |
| Chylismia munzii | (P.H.Raven) W.L.Wagner & Hoch | Onagraceae | 7 |
| Cordylanthus parviflorus | (Ferris) Wiggins | Orobanchaceae | 7 |
| Corispermum americanum | (Nutt.) Nutt. | Chenopodiaceae | 7 |
| Crepis modocensis | Greene | Asteraceae | 7 |
| Crepis runcinata | (E.James) Torr. & A.Gray | Asteraceae | 7 |
| Ephedra funerea | Coville & C.V.Morton | Ephedraceae | 7 |
| Eriastrum sparsiflorum | (Eastw.) H.Mason | Polemoniaceae | 7 |
| Eriochloa acuminata | (J.Presl) Kunth | Poaceae | 7 |
| Festuca saximontana | Rydb. | Poaceae | 7 |
| Frasera gypsicola | (Barneby) D.M.Post | Gentianaceae | 7 |
| Juncus orthophyllus | Coville | Juncaceae | 7 |
| Linanthus bigelovii | (A.Gray) Greene | Polemoniaceae | 7 |
| Mentzelia jonesii | (Urb. & Gilg) H.J.Thomps. & J.E.Roberts | Loasaceae | 7 |
| Monardella linoides | A.Gray | Lamiaceae | 7 |
| Nemacladus rigidus | Curran | Campanulaceae | 7 |
| Penstemon immanifestus | N.H.Holmgren | Plantaginaceae | 7 |
| Phacelia mustelina | Coville | Hydrophyllaceae | 7 |
| Phacelia tetramera | J.T.Howell | Hydrophyllaceae | 7 |
| Plagiobothrys mollis | (A.Gray) I.M.Johnst. | Boraginaceae | 7 |
| Plantago eriopoda | Torr. | Plantaginaceae | 7 |
| Primula cusickiana | (A.Gray) A.Gray | Primulaceae | 7 |
| Sidalcea multifida | Greene | Malvaceae | 7 |
| Streptanthus major | Jeps. | Brassicaceae | 7 |
| Suaeda occidentalis | (S.Watson) S.Watson | Chenopodiaceae | 7 |
| Allium atrorubens | S.Watson | Amaryllidaceae | 6 |
| Amaranthus arenicola | I.M.Johnst. | Amaranthaceae | 6 |
| Astragalus argophyllus | Nutt. | Fabaceae | 6 |
| Astragalus geyeri | A.Gray | Fabaceae | 6 |
| Bacopa eisenii | (Kellogg) Pennell | Plantaginaceae | 6 |
| Boechera lincolnensis | Windham & Al-Shehbaz | Brassicaceae | 6 |
| Camissonia pubens | (S.Watson) P.H.Raven | Onagraceae | 6 |
| Carex holmgreniorum | Reznicek & D.F.Murray | Cyperaceae | 6 |
| Collomia tenella | A.Gray | Polemoniaceae | 6 |
| Descurainia adenophora | (Wooton & Standl.) O.E.Schulz | Brassicaceae | 6 |
| Dimeresia howellii | A.Gray | Asteraceae | 6 |
| Ericameria watsonii | (A.Gray) G.L.Nesom | Asteraceae | 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 |
| Juncus chlorocephalus | Engelm. | Juncaceae | 6 |
| Lathrocasis tenerrima | (A.Gray) L.A.Johnson | Polemoniaceae | 6 |
| Leptosiphon pachyphyllus | (R.Patt.) J.M.Porter & L.A.Johnson | Polemoniaceae | 6 |
| Lupinus wyethii | S.Watson | Fabaceae | 6 |
| Lygodesmia grandiflora | (Nutt.) Torr. & A.Gray | Asteraceae | 6 |
| Melica spectabilis | Scribn. | Poaceae | 6 |
| Mentzelia integra | (M.E.Jones) Tidestr. | Loasaceae | 6 |
| Mentzelia leucophylla | Brandegee | Loasaceae | 6 |
| Nama depressa | Lemmon ex A.Gray | Namaceae | 6 |
| Navarretia sinistra | (M.E.Jones) L.A.Johnson | Polemoniaceae | 6 |
| Phacelia lemmonii | A.Gray | Hydrophyllaceae | 6 |
| Polygonum ramosissimum | Michx. | Polygonaceae | 6 |
| Potentilla kingii | (S.Watson) Greene | Rosaceae | 6 |
| Veronica ranunculina | (Pennell) M.M.Mart.Ort. & Albach | Plantaginaceae | 6 |
| Viola utahensis | M.S.Baker & J.C.Clausen | Violaceae | 6 |
| Amsinckiopsis kingii | (S.Watson) Guilliams, Hasenstab & B.G.Baldwin | Boraginaceae | 5 |
| Artemisia constricta | Sòn.Garcia, Garnatje, McArthur, Pellicer, S.C.Sand. & Vallès-Xirau | Asteraceae | 5 |
| Asclepias eastwoodiana | Barneby | Apocynaceae | 5 |
| Astragalus tetrapterus | A.Gray | Fabaceae | 5 |
| Astragalus toanus | M.E.Jones | Fabaceae | 5 |
| Atriplex truncata | (Torr. ex S.Watson) A.Gray | Chenopodiaceae | 5 |
| Boechera microphylla | (Nutt.) Dorn | Brassicaceae | 5 |
| Boechera tiehmii | (Rollins) Al-Shehbaz | Brassicaceae | 5 |
| Bromus orcuttianus | Vasey | Poaceae | 5 |
| Carex helleri | Mack. | Cyperaceae | 5 |
| Carex jonesii | L.H.Bailey | Cyperaceae | 5 |
| Carex oederi | Retz. | Cyperaceae | 5 |
| Carex praeceptorum | Mack. | Cyperaceae | 5 |
| Chylismia multijuga | (S.Watson) Small | Onagraceae | 5 |
| Cryptantha muricata | (Hook. & Arn.) A.Nelson & J.F.Macbr. | Boraginaceae | 5 |
| Cuscuta salina | Engelm. | Convolvulaceae | 5 |
| Descurainia obtusa | (Greene) O.E.Schulz | Brassicaceae | 5 |
| Draba paucifructa | Clokey & C.L.Hitchc. | Brassicaceae | 5 |
| Drymocallis lactea | (Greene) Rydb. | Rosaceae | 5 |
| Drymocallis pseudorupestris | (Rydb.) Rydb. | Rosaceae | 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 |
| Micromonolepis pusilla | (Torr. ex S.Watson) Ulbr. | Chenopodiaceae | 5 |
| Muhlenbergia andina | (Nutt.) Hitchc. | Poaceae | 5 |
| Oreocarya nubigena | Greene | Boraginaceae | 5 |
| Orobanche parishii | (Jeps.) Heckard | Orobanchaceae | 5 |
| Perityle gracilis | (M.E.Jones) Rydb. | Asteraceae | 5 |
| Phacelia mutabilis | Greene | Hydrophyllaceae | 5 |
| Polygonum polygaloides | Meisn. | Polygonaceae | 5 |
| Potentilla holmgrenii | D.F.Murray & Elven | Rosaceae | 5 |
| Salix lemmonii | Bebb | Salicaceae | 5 |
| Scutellaria sapphirina | (Barneby) Olmstead | Lamiaceae | 5 |
| Viola charlestonensis | M.S.Baker & J.C.Clausen | Violaceae | 5 |
| Arceuthobium cyanocarpum | (A.Nelson ex Rydb.) J.M.Coult. & A.Nelson | Santalaceae | 4 |
| Artemisia inaequifolia | Sòn.Garcia, Garnatje, McArthur, Pellicer, S.C.Sand. & Vallès-Xirau | Asteraceae | 4 |
| Astragalus pinonis | M.E.Jones | Fabaceae | 4 |
| Astragalus tiehmii | Barneby | Fabaceae | 4 |
| Boechera cusickii | (S.Watson) Al-Shehbaz | Brassicaceae | 4 |
| Boechera falcifructa | (Rollins) Al-Shehbaz | Brassicaceae | 4 |
| Carex abrupta | Mack. | Cyperaceae | 4 |
| Carex pelocarpa | F.J.Herm. | Cyperaceae | 4 |
| Chrysothamnus humilis | Greene | Asteraceae | 4 |
| Chrysothamnus vaseyi | (A.Gray) Greene | Asteraceae | 4 |
| Cleomella brevipes | S.Watson | Cleomaceae | 4 |
| Cordylanthus kingii | S.Watson | Orobanchaceae | 4 |
| Delphinium depauperatum | Nutt. | Ranunculaceae | 4 |
| Draba asterophora | Payson | Brassicaceae | 4 |
| Draba incerta | Payson | Brassicaceae | 4 |
| Eriogonum crosbyae | Reveal | Polygonaceae | 4 |
| Gilia salticola | Eastw. | Polemoniaceae | 4 |
| Hackelia sharsmithii | I.M.Johnst. | Boraginaceae | 4 |
| Heuchera grossulariifolia | Rydb. | Saxifragaceae | 4 |
| Juncus bryoides | F.J.Herm. | Juncaceae | 4 |
| Lepidium dictyotum | A.Gray | Brassicaceae | 4 |
| Lepidium ramosissimum | A.Nelson | Brassicaceae | 4 |
| Leptosiphon harknessii | (Curran) J.M.Porter & L.A.Johnson | Polemoniaceae | 4 |
| Lupinus andersonii | S.Watson | Fabaceae | 4 |
| Mertensia nevadensis | A.Nelson | Boraginaceae | 4 |
| Mirabilis pudica | Barneby | Nyctaginaceae | 4 |
| Oenothera longissima | Rydb. | Onagraceae | 4 |
| Phacelia anelsonii | J.F.Macbr. | Hydrophyllaceae | 4 |
| Phlox caespitosa | Nutt. | Polemoniaceae | 4 |
| Plagiobothrys leptocladus | (Greene) I.M.Johnst. | Boraginaceae | 4 |
| Podagrostis humilis | (Vasey) Björkman | Poaceae | 4 |
| Polemonium nevadense | Wherry | Polemoniaceae | 4 |
| Potentilla cryptocaulis | Clokey | Rosaceae | 4 |
| Pyrrocoma racemosa | Torr. & A.Gray | Asteraceae | 4 |
| Ribes lasianthum | Greene | Grossulariaceae | 4 |
| Silene grayi | S.Watson | Caryophyllaceae | 4 |
| Stellaria calycantha | (Ledeb.) Bong. | Caryophyllaceae | 4 |
| Stylocline intertexta | Morefield | Asteraceae | 4 |
| Townsendia jonesii | (Beaman) Reveal | Asteraceae | 4 |
| Agrostis variabilis | Rydb. | Poaceae | 3 |
| Aliciella heterostyla | (S.Cochrane & A.G.Day) J.M.Porter | Polemoniaceae | 3 |
| Astragalus jejunus | S.Watson | Fabaceae | 3 |
| Astragalus toquimanus | Barneby | Fabaceae | 3 |
| Boechera suffrutescens | (S.Watson) Dorn | Brassicaceae | 3 |
| Botrychium tunux | Stensvold & Farrar | Ophioglossaceae | 3 |
| Camissonia kernensis | (Munz) P.H.Raven | Onagraceae | 3 |
| Castilleja dissitiflora | N.H.Holmgren | Orobanchaceae | 3 |
| Chenopodium desiccatum | A.Nelson | Chenopodiaceae | 3 |
| Chloropyron tecopense | (Munz & J.C.Roos) Tank & J.M.Egger | Orobanchaceae | 3 |
| Cirsium inamoenum | (Greene) D.J.Keil | Asteraceae | 3 |
| Crepis pleurocarpa | A.Gray | Asteraceae | 3 |
| Cryptantha decipiens | (M.E.Jones) A.Heller | Boraginaceae | 3 |
| Cryptantha torreyana | (A.Gray) Greene | Boraginaceae | 3 |
| Cymopterus basalticus | M.E.Jones | Apiaceae | 3 |
| Downingia laeta | (Greene) Greene | Campanulaceae | 3 |
| Draba arida | C.L.Hitchc. | Brassicaceae | 3 |
| Draba crassifolia | Graham | Brassicaceae | 3 |
| Erigeron clokeyi | Cronquist | Asteraceae | 3 |
| Erigeron lobatus | A.Nelson | Asteraceae | 3 |
| Eriogonum ampullaceum | J.T.Howell | Polygonaceae | 3 |
| Erysimum inconspicuum | (S.Watson) MacMill. | Brassicaceae | 3 |
| Festuca minutiflora | Rydb. | Poaceae | 3 |
| Galium hypotrichium | A.Gray | Rubiaceae | 3 |
| Gentianella amarella | (L.) Börner | Gentianaceae | 3 |
| Glyptopleura setulosa | A.Gray | Asteraceae | 3 |
| Grindelia fraxinipratensis | Reveal & Beatley | Asteraceae | 3 |
| Lathyrus grimesii | Barneby | Fabaceae | 3 |
| Lathyrus rigidus | T.G.White | Fabaceae | 3 |
| Marsilea oligospora | Goodd. | Marsileaceae | 3 |
| Mentzelia tiehmii | N.H.Holmgren & P.K.Holmgren | Loasaceae | 3 |
| Monoptilon bellidiforme | Torr. & A.Gray | Asteraceae | 3 |
| Packera subnuda | (DC.) Trock & T.M.Barkley | Asteraceae | 3 |
| Phacelia geraniifolia | Brand | Hydrophyllaceae | 3 |
| Phlox gladiformis | (M.E.Jones) E.E.Nelson | Polemoniaceae | 3 |
| Phlox viscida | E.E.Nelson | Polemoniaceae | 3 |
| Physaria newberryi | A.Gray | Brassicaceae | 3 |
| Potentilla shockleyi | (S.Watson) Jeps. | Rosaceae | 3 |
| Pyrrocoma lanceolata | (Hook.) Greene | Asteraceae | 3 |
| Pyrrocoma uniflora | (Hook.) Greene | Asteraceae | 3 |
| Ranunculus cupulatus | (S.Watson) Christenh. & Byng | Ranunculaceae | 3 |
| Salix prolixa | Andersson | Salicaceae | 3 |
| Sambucus mexicana | C.Presl ex DC. | Viburnaceae | 3 |
| Sclerocactus pubispinus | (Engelm.) L.D.Benson | Cactaceae | 3 |
| Thelypodium flexuosum | B.L.Rob. | Brassicaceae | 3 |
Abies concolorwhite fir
Abies lasiocarpaAlpine Fir
Abies magnificaCalifornia Red Fir
Abronia crux-maltae
Abronia ellipticafragrant white sand verbena
Abronia micranthasmallflower sandverbena
Abronia nanadwarf sand verbena
Abronia turbinatatransmontane sand verbena
Abronia villosadesert sand verbena
Abutilon parvulumdwarf Indian mallow
Acamptopappus shockleyiShockley's goldenhead
Acamptopappus sphaerocephalusrayless goldenhead
Acer glabrumRocky Mountain maple
Acer negundobox elder
Acer saccharumsugar maple
Achillea millefoliumcommon yarrow
Achyronychia cooperionyxflower
Acleisanthes nevadensisdesert moonpod
Acmispon brachycarpusfoothill deervetch
Acmispon decumbensNevada bird's-foot trefoil
Acmispon maritimuscoastal bird's-foot trefoil
Acmispon oroboides
Acmispon parviflorusdesert deervetch
Acmispon rigidusBroom Lotus
Acmispon strigosusstrigose bird's-foot trefoil
Acmispon utahensisUtah bird's-foot trefoil
Aconitum columbianumColumbian Monkshood
Acourtia wrightiibrownfoot
Actaea rubrared baneberry
Adenophyllum cooperiCooper's dogweed
Adenophyllum porophylloidesSan Felipe dogweed
Adiantum aleuticumwestern maidenhair fern
Adiantum capillus-venerisblack maidenhair fern
Adiaphila brickellioidesbrickellbush goldenweed
Agastache urticifolianettleleaf giant hyssop
Agave utahensisUtah agave
Ageratina herbaceafragrant snakeroot
Ageratina occidentaliswestern snakeroot
Agoseris aurantiacaorange agoseris
Agoseris glaucapale agoseris
Agoseris grandiflorabigflower agoseris
Agoseris heterophyllaannual agoseris
Agoseris retrorsaspearleaf agoseris
Agrimonia striataRoadside Agrimony
Agrostis pallensseashore bentgrass
Agrostis scabrarough bentgrass
Aliciella hutchinsifoliadesert pale gilia
Aliciella latifoliabroad-leaf gilia
