| Abies balsamea | (L.) Mill. | Pinaceae | 8 |
| Abies lasiocarpa | (Hook.) Nutt. | Pinaceae | 8 |
| Abronia micrantha | Torr. | Nyctaginaceae | 8 |
| Acer glabrum | Torr. | Sapindaceae | 8 |
| Acer negundo | L. | Sapindaceae | 8 |
| Achillea alpina | L. | Asteraceae | 8 |
| Achillea millefolium | L. | Asteraceae | 8 |
| Acorus calamus | L. | Acoraceae | 8 |
| Actaea rubra | (Aiton) Willd. | Ranunculaceae | 8 |
| Adenocaulon bicolor | Hook. | Asteraceae | 8 |
| Adiantum aleuticum | (Rupr.) C.A.Paris | Pteridaceae | 8 |
| Adoxa moschatellina | L. | Viburnaceae | 8 |
| Agastache foeniculum | (Pursh) Kuntze | Lamiaceae | 8 |
| Agoseris aurantiaca | (Hook.) Greene | Asteraceae | 8 |
| Agoseris glauca | (Pursh) Raf. | Asteraceae | 8 |
| Agrimonia striata | Michx. | Rosaceae | 8 |
| Agrostis scabra | Willd. | Poaceae | 8 |
| Alisma gramineum | Lej. | Alismataceae | 8 |
| Alisma triviale | Pursh | Alismataceae | 8 |
| Allium cernuum | Roth | Amaryllidaceae | 8 |
| Allium geyeri | S.Watson | Amaryllidaceae | 8 |
| Allium schoenoprasum | L. | Amaryllidaceae | 8 |
| Allium textile | A.Nelson & J.F.Macbr. | Amaryllidaceae | 8 |
| Alnus alnobetula | (Ehrh.) K.Koch | Betulaceae | 8 |
| Alnus incana | (L.) Moench | Betulaceae | 8 |
| Alopecurus aequalis | Sobol. | Poaceae | 8 |
| Alopecurus carolinianus | Walter | Poaceae | 8 |
| Alopecurus magellanicus | Lam. | Poaceae | 8 |
| Ambrosia acanthicarpa | Hook. | Asteraceae | 8 |
| Ambrosia artemisiifolia | L. | Asteraceae | 8 |
| Ambrosia psilostachya | DC. | Asteraceae | 8 |
| Ambrosia trifida | L. | Asteraceae | 8 |
| Amelanchier alnifolia | (Nutt.) Nutt. ex M.Roem. | Rosaceae | 8 |
| Amelanchier sanguinea | (Pursh) DC. | Rosaceae | 8 |
| Amphiscirpus nevadensis | (S.Watson) Oteng-Yeb. | Cyperaceae | 8 |
| Amsinckia menziesii | (Lehm.) A.Nelson & J.F.Macbr. | Boraginaceae | 8 |
| Anaphalis margaritacea | (L.) Benth. & Hook.f. | Asteraceae | 8 |
| Andersonglossum boreale | (Fernald) Jim.Mejías, J.I.Cohen & Naczi | Boraginaceae | 8 |
| Andromeda polifolia | L. | Ericaceae | 8 |
| Androsace lehmanniana | Spreng. | Primulaceae | 8 |
| Androsace montana | (A.Gray) Wendelbo | Primulaceae | 8 |
| Androsace occidentalis | Pursh | Primulaceae | 8 |
| Androsace septentrionalis | L. | Primulaceae | 8 |
| Anemonastrum canadense | (L.) Mosyakin | Ranunculaceae | 8 |
| Anemonastrum richardsonii | (Hook.) Mosyakin | Ranunculaceae | 8 |
| Anemone cylindrica | A.Gray | Ranunculaceae | 8 |
| Anemone lithophila | Rydb. | Ranunculaceae | 8 |
| Anemone multifida | Poir. | Ranunculaceae | 8 |
| Anemone parviflora | Michx. | Ranunculaceae | 8 |
| Anemone quinquefolia | L. | Ranunculaceae | 8 |
| Anemone virginiana | L. | Ranunculaceae | 8 |
| Angelica arguta | Nutt. | Apiaceae | 8 |
| Angelica dawsonii | S.Watson | Apiaceae | 8 |
| Angelica genuflexa | Nutt. | Apiaceae | 8 |
| Antennaria anaphaloides | Rydb. | Asteraceae | 8 |
| Antennaria dimorpha | Torr. & A.Gray | Asteraceae | 8 |
| Antennaria howellii | Greene | Asteraceae | 8 |
| Antennaria lanata | Greene | Asteraceae | 8 |
| Antennaria luzuloides | Torr. & A.Gray | Asteraceae | 8 |
| Antennaria media | Greene | Asteraceae | 8 |
| Antennaria microphylla | Rydb. | Asteraceae | 8 |
| Antennaria monocephala | DC. | Asteraceae | 8 |
| Antennaria neglecta | Greene | Asteraceae | 8 |
| Antennaria parvifolia | Nutt. | Asteraceae | 8 |
| Antennaria pulcherrima | (Hook.) Greene | Asteraceae | 8 |
| Antennaria racemosa | Hook. | Asteraceae | 8 |
| Antennaria rosea | Greene | Asteraceae | 8 |
| Antennaria umbrinella | Rydb. | Asteraceae | 8 |
| Anthoxanthum monticola | (Bigelow) Veldkamp | Poaceae | 8 |
| Anthoxanthum nitens | (Weber) Y.Schouten & Veldkamp | Poaceae | 8 |
| Anticlea elegans | (Pursh) Rydb. | Melanthiaceae | 8 |
| Anticlea occidentalis | (A.Gray) Zomlefer & Judd | Melanthiaceae | 8 |
| Apocynum androsaemifolium | L. | Apocynaceae | 8 |
| Apocynum cannabinum | L. | Apocynaceae | 8 |
| Aquilegia brevistyla | Hook. | Ranunculaceae | 8 |
| Aquilegia flavescens | S.Watson | Ranunculaceae | 8 |
| Aquilegia formosa | Fisch. ex DC. | Ranunculaceae | 8 |
| Aquilegia jonesii | Parry | Ranunculaceae | 8 |
| Arabidopsis lyrata | (L.) O'Kane & Al-Shehbaz | Brassicaceae | 8 |
| Arabis eschscholtziana | Andrz. ex Ledeb. | Brassicaceae | 8 |
| Aralia nudicaulis | L. | Araliaceae | 8 |
| Arceuthobium americanum | Nutt. ex Engelm. | Santalaceae | 8 |
| Arctostaphylos uva-ursi | (L.) Spreng. | Ericaceae | 8 |
| Arctous alpina | (L.) Nied. | Ericaceae | 8 |
| Arctous rubra | (Rehder & E.H.Wilson) Nakai | Ericaceae | 8 |
| Arethusa bulbosa | L. | Orchidaceae | 8 |
| Argentina anserina | (L.) Rydb. | Rosaceae | 8 |
| Arnica angustifolia | Vahl | Asteraceae | 8 |
| Arnica chamissonis | Less. | Asteraceae | 8 |
| Arnica cordifolia | Hook. | Asteraceae | 8 |
| Arnica fulgens | Pursh | Asteraceae | 8 |
| Arnica gracilis | Rydb. | Asteraceae | 8 |
| Arnica lanceolata | Nutt. | Asteraceae | 8 |
| Arnica latifolia | Bong. | Asteraceae | 8 |
| Arnica lonchophylla | Greene | Asteraceae | 8 |
| Arnica longifolia | D.C.Eaton | Asteraceae | 8 |
| Arnica mollis | Hook. | Asteraceae | 8 |
| Arnica parryi | A.Gray | Asteraceae | 8 |
| Arnica rydbergii | Greene | Asteraceae | 8 |
| Arnica sororia | Greene | Asteraceae | 8 |
| Artemisia biennis | Willd. | Asteraceae | 8 |
| Artemisia campestris | L. | Asteraceae | 8 |
| Artemisia cana | Pursh | Asteraceae | 8 |
| Artemisia dracunculus | L. | Asteraceae | 8 |
| Artemisia frigida | Willd. | Asteraceae | 8 |
| Artemisia longifolia | Nutt. | Asteraceae | 8 |
| Artemisia ludoviciana | Nutt. | Asteraceae | 8 |
| Artemisia michauxiana | Besser | Asteraceae | 8 |
| Artemisia norvegica | Fr. | Asteraceae | 8 |
| Artemisia tilesii | Ledeb. | Asteraceae | 8 |
| Artemisia tridentata | Nutt. | Asteraceae | 8 |
| Aruncus dioicus | (Walter) Fernald | Rosaceae | 8 |
| Asclepias ovalifolia | Decne. | Apocynaceae | 8 |
| Asclepias speciosa | Torr. | Apocynaceae | 8 |
| Asclepias viridiflora | Raf. | Apocynaceae | 8 |
| Askellia elegans | (Hook.) W.A.Weber | Asteraceae | 8 |
| Askellia pygmaea | (Ledeb.) Sennikov | Asteraceae | 8 |
| Asplenium trichomanes | L. | Aspleniaceae | 8 |
| Asplenium viride | Huds. | Aspleniaceae | 8 |
| Aster alpinus | L. | Asteraceae | 8 |
| Astragalus agrestis | Douglas ex G.Don | Fabaceae | 8 |
| Astragalus alpinus | L. | Fabaceae | 8 |
| Astragalus americanus | (Hook.) M.E.Jones | Fabaceae | 8 |
| Astragalus bisulcatus | (Hook.) A.Gray | Fabaceae | 8 |
| Astragalus bodinii | E.Sheld. | Fabaceae | 8 |
| Astragalus bourgovii | A.Gray | Fabaceae | 8 |
| Astragalus canadensis | L. | Fabaceae | 8 |
| Astragalus crassicarpus | Nutt. | Fabaceae | 8 |
| Astragalus drummondii | Douglas ex Hook. | Fabaceae | 8 |
| Astragalus eucosmus | B.L.Rob. | Fabaceae | 8 |
| Astragalus flexuosus | (Hook.) Douglas ex G.Don | Fabaceae | 8 |
| Astragalus gilviflorus | E.Sheld. | Fabaceae | 8 |
| Astragalus kentrophyta | A.Gray | Fabaceae | 8 |
| Astragalus laxmannii | Jacq. | Fabaceae | 8 |
| Astragalus lotiflorus | Hook. | Fabaceae | 8 |
| Astragalus miser | Douglas ex Hook. | Fabaceae | 8 |
| Astragalus missouriensis | Nutt. | Fabaceae | 8 |
| Astragalus multiflorus | (Pursh) A.Gray | Fabaceae | 8 |
| Astragalus pectinatus | (Hook.) Douglas ex G.Don | Fabaceae | 8 |
| Astragalus purshii | Douglas ex G.Don | Fabaceae | 8 |
| Astragalus robbinsii | (Oakes) A.Gray | Fabaceae | 8 |
| Astragalus spatulatus | E.Sheld. | Fabaceae | 8 |
| Astragalus vexilliflexus | E.Sheld. | Fabaceae | 8 |
| Athyrium americanum | (Butters) Maxon | Athyriaceae | 8 |
| Atriplex argentea | Nutt. | Chenopodiaceae | 8 |
| Atriplex canescens | (Pursh) Nutt. | Chenopodiaceae | 8 |
| Atriplex patula | L. | Chenopodiaceae | 8 |
| Barbarea orthoceras | Ledeb. | Brassicaceae | 8 |
| Beckmannia syzigachne | (Steud.) Fernald | Poaceae | 8 |
| Berberis repens | Lindl. | Berberidaceae | 8 |
| Betula glandulosa | Michx. | Betulaceae | 8 |
| Betula occidentalis | Hook. | Betulaceae | 8 |
| Betula papyrifera | Marshall | Betulaceae | 8 |
| Betula pendula | Roth | Betulaceae | 8 |
| Betula pumila | L. | Betulaceae | 8 |
| Bidens cernua | L. | Asteraceae | 8 |
| Bidens frondosa | L. | Asteraceae | 8 |
| Bidens tripartita | L. | Asteraceae | 8 |
| Bidens vulgata | Greene | Asteraceae | 8 |
| Blitum capitatum | L. | Chenopodiaceae | 8 |
| Blitum nuttallianum | Schult. | Chenopodiaceae | 8 |
| Boechera angustifolia | (Nutt.) Dorn | Brassicaceae | 8 |
| Boechera grahamii | (Lehm.) Windham & Al-Shehbaz | Brassicaceae | 8 |
| Boechera lemmonii | (S.Watson) W.A.Weber | Brassicaceae | 8 |
| Boechera retrofracta | (Graham) Á.Löve & D.Löve | Brassicaceae | 8 |
| Bolboschoenus fluviatilis | (Torr.) Soják | Cyperaceae | 8 |
| Bolboschoenus maritimus | (L.) Palla | Cyperaceae | 8 |
| Boschniakia rossica | (Cham. & Schltdl.) B.Fedtsch. | Orobanchaceae | 8 |
| Botrychium ascendens | W.H.Wagner | Ophioglossaceae | 8 |
| Botrychium boreale | Milde | Ophioglossaceae | 8 |
| Botrychium campestre | W.H.Wagner & Farrar | Ophioglossaceae | 8 |
| Botrychium crenulatum | W.H.Wagner | Ophioglossaceae | 8 |
| Botrychium lanceolatum | (Gmel.) Ångstr. | Ophioglossaceae | 8 |
| Botrychium lineare | W.H.Wagner | Ophioglossaceae | 8 |
| Botrychium minganense | Vict. | Ophioglossaceae | 8 |
| Botrychium paradoxum | W.H.Wagner | Ophioglossaceae | 8 |
| Botrychium pedunculosum | W.H.Wagner | Ophioglossaceae | 8 |
| Botrychium pinnatum | H.St.John | Ophioglossaceae | 8 |
| Botrychium simplex | E.Hitchc. | Ophioglossaceae | 8 |
| Botrychium spathulatum | W.H.Wagner | Ophioglossaceae | 8 |
| Botrypus virginianus | (L.) Michx. | Ophioglossaceae | 8 |
| Bouteloua curtipendula | (Michx.) Torr. | Poaceae | 8 |
| Bouteloua gracilis | (Kunth) Lag. ex Griffiths | Poaceae | 8 |
| Brasenia schreberi | J.F.Gmel. | Cabombaceae | 8 |
| Braya humilis | (C.A.Mey.) B.L.Rob. | Brassicaceae | 8 |
| Brewerimitella breweri | (A.Gray) R.A.Folk & Y.Okuyama | Saxifragaceae | 8 |
| Bromus carinatus | Hook. & Arn. | Poaceae | 8 |
| Bromus ciliatus | L. | Poaceae | 8 |
| Bromus latiglumis | (Shear) Hitchc. | Poaceae | 8 |
| Bromus porteri | (Coult.) Nash | Poaceae | 8 |
| Bromus pumpellianus | Scribn. | Poaceae | 8 |
| Bromus sitchensis | Trin. | Poaceae | 8 |
| Bromus vulgaris | (Hook.) Shear | Poaceae | 8 |
| Bupleurum americanum | J.M.Coult. & Rose | Apiaceae | 8 |
| Calamagrostis canadensis | (Michx.) P.Beauv. | Poaceae | 8 |
| Calamagrostis inexpansa | A.Gray | Poaceae | 8 |
| Calamagrostis lapponica | (Wahlenb.) Hartm. | Poaceae | 8 |
| Calamagrostis montanensis | (Scribn.) Scribn. ex Vasey | Poaceae | 8 |
| Calamagrostis purpurascens | R.Br. | Poaceae | 8 |
| Calamagrostis purpurea | (Trin.) Trin. | Poaceae | 8 |
| Calamagrostis rubescens | Buckley | Poaceae | 8 |
| Calamagrostis stricta | (Timm) Koeler | Poaceae | 8 |
| Calla palustris | L. | Araceae | 8 |
| Callitriche hermaphroditica | L. | Plantaginaceae | 8 |
| Callitriche heterophylla | Pursh | Plantaginaceae | 8 |
| Callitriche palustris | L. | Plantaginaceae | 8 |
| Calochortus apiculatus | Baker | Liliaceae | 8 |
| Caltha leptosepala | DC. | Ranunculaceae | 8 |
| Caltha palustris | L. | Ranunculaceae | 8 |
| Calypso bulbosa | (L.) Oakes | Orchidaceae | 8 |
| Calystegia sepium | (L.) R.Br. | Convolvulaceae | 8 |
| Camassia quamash | (Pursh) Greene | Asparagaceae | 8 |
| Campanula alaskana | (A.Gray) Wight ex J.P.Anderson & Hultén | Campanulaceae | 8 |
| Campanula lasiocarpa | Cham. | Campanulaceae | 8 |
| Campanula petiolata | A.DC. | Campanulaceae | 8 |
| Canadanthus modestus | (Lindl.) G.L.Nesom | Asteraceae | 8 |
| Capnoides sempervirens | (L.) Borkh. | Papaveraceae | 8 |
| Cardamine bellidifolia | L. | Brassicaceae | 8 |
| Cardamine parviflora | L. | Brassicaceae | 8 |
| Cardamine pensylvanica | Muhl. ex Willd. | Brassicaceae | 8 |
| Carex adusta | Boott | Cyperaceae | 8 |
| Carex alascana | Boeckeler | Cyperaceae | 8 |
| Carex aquatilis | Wahlenb. | Cyperaceae | 8 |
| Carex atherodes | Spreng. | Cyperaceae | 8 |
| Carex athrostachya | Olney | Cyperaceae | 8 |
| Carex atratiformis | Britton | Cyperaceae | 8 |
| Carex atrosquama | Mack. | Cyperaceae | 8 |
| Carex aurea | Nutt. | Cyperaceae | 8 |
| Carex bebbii | (L.H.Bailey) Olney ex Fernald | Cyperaceae | 8 |
| Carex brevior | (Dewey) Mack. ex Lunell | Cyperaceae | 8 |
| Carex brunnescens | (Pers.) Poir. | Cyperaceae | 8 |
| Carex buxbaumii | Wahlenb. | Cyperaceae | 8 |
| Carex canescens | L. | Cyperaceae | 8 |
| Carex capillaris | L. | Cyperaceae | 8 |
| Carex capitata | Sol. | Cyperaceae | 8 |
| Carex chordorrhiza | L.f. | Cyperaceae | 8 |
| Carex concinna | R.Br. | Cyperaceae | 8 |
| Carex concinnoides | Mack. | Cyperaceae | 8 |
| Carex crawei | Dewey ex Torr. | Cyperaceae | 8 |
| Carex crawfordii | Fernald | Cyperaceae | 8 |
| Carex deflexa | Hornem. | Cyperaceae | 8 |
| Carex deweyana | Schwein. | Cyperaceae | 8 |
| Carex diandra | Schrank | Cyperaceae | 8 |
| Carex disperma | Dewey | Cyperaceae | 8 |
| Carex douglasii | Boott | Cyperaceae | 8 |
| Carex duriuscula | C.A.Mey. | Cyperaceae | 8 |
| Carex eburnea | Boott | Cyperaceae | 8 |
| Carex echinata | Murray | Cyperaceae | 8 |
| Carex filifolia | Nutt. | Cyperaceae | 8 |
| Carex flava | L. | Cyperaceae | 8 |
| Carex foenea | Willd. | Cyperaceae | 8 |
| Carex garberi | Fernald | Cyperaceae | 8 |
| Carex haydeniana | Olney | Cyperaceae | 8 |
| Carex heteroneura | W.Boott | Cyperaceae | 8 |
| Carex hoodii | Boott | Cyperaceae | 8 |
| Carex houghtoniana | Torr. ex Dewey | Cyperaceae | 8 |
| Carex hystericina | Muhl. ex Willd. | Cyperaceae | 8 |
| Carex illota | L.H.Bailey | Cyperaceae | 8 |
| Carex incurviformis | Mack. | Cyperaceae | 8 |
| Carex inops | L.H.Bailey | Cyperaceae | 8 |
| Carex interior | L.H.Bailey | Cyperaceae | 8 |
| Carex kelloggii | W.Boott | Cyperaceae | 8 |
| Carex lachenalii | Schkuhr | Cyperaceae | 8 |
| Carex lacustris | Willd. | Cyperaceae | 8 |
| Carex lasiocarpa | Ehrh. | Cyperaceae | 8 |
| Carex lenticularis | Michx. | Cyperaceae | 8 |
| Carex leptalea | Wahlenb. | Cyperaceae | 8 |
| Carex limosa | L. | Cyperaceae | 8 |
| Carex livida | (Wahlenb.) Willd. | Cyperaceae | 8 |
| Carex macloviana | d'Urv. | Cyperaceae | 8 |
| Carex magellanica | Lam. | Cyperaceae | 8 |
| Carex media | R.Br. | Cyperaceae | 8 |
| Carex mertensii | J.D.Prescott ex Bong. | Cyperaceae | 8 |
| Carex microglochin | Wahlenb. | Cyperaceae | 8 |
| Carex micropoda | C.A.Mey. | Cyperaceae | 8 |
| Carex microptera | Mack. | Cyperaceae | 8 |
| Carex myosuroides | Vill. | Cyperaceae | 8 |
| Carex nardina | (Hornem.) Fr. | Cyperaceae | 8 |
| Carex nigricans | C.A.Mey. | Cyperaceae | 8 |
| Carex oligosperma | Michx. | Cyperaceae | 8 |
| Carex pachystachya | Cham. ex Steud. | Cyperaceae | 8 |
| Carex pauciflora | Lightf. | Cyperaceae | 8 |
| Carex peckii | Howe | Cyperaceae | 8 |
| Carex pedunculata | Muhl. ex Willd. | 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 prairea | Dewey ex Alph.Wood | Cyperaceae | 8 |
| Carex praticola | Rydb. | Cyperaceae | 8 |
| Carex preslii | Steud. | Cyperaceae | 8 |
| Carex pseudocyperus | L. | Cyperaceae | 8 |
| Carex raynoldsii | Dewey | Cyperaceae | 8 |
| Carex retrorsa | Schwein. | Cyperaceae | 8 |
| Carex richardsonii | R.Br. | Cyperaceae | 8 |
| Carex rossii | Boott | Cyperaceae | 8 |
| Carex rostrata | Stokes | Cyperaceae | 8 |
| Carex rupestris | All. | Cyperaceae | 8 |
| Carex sartwellii | Dewey | Cyperaceae | 8 |
| Carex scirpoidea | Michx. | Cyperaceae | 8 |
| Carex scoparia | Schkuhr ex Willd. | Cyperaceae | 8 |
| Carex siccata | Dewey | Cyperaceae | 8 |
| Carex simpliciuscula | Wahlenb. | Cyperaceae | 8 |
| Carex spectabilis | Dewey | Cyperaceae | 8 |
| Carex sprengelii | Dewey ex Spreng. | Cyperaceae | 8 |
| Carex stipata | Muhl. ex Willd. | Cyperaceae | 8 |
| Carex supina | Willd. ex Wahlenb. | Cyperaceae | 8 |
| Carex sychnocephala | J.Carey | Cyperaceae | 8 |
| Carex tahoensis | Smiley | Cyperaceae | 8 |
| Carex tenera | Dewey | Cyperaceae | 8 |
| Carex tenuiflora | Wahlenb. | Cyperaceae | 8 |
| Carex tonsa | (Fernald) E.P.Bicknell | Cyperaceae | 8 |
| Carex trisperma | Dewey | Cyperaceae | 8 |
| Carex umbellata | Willd. | Cyperaceae | 8 |
| Carex utriculata | Boott | Cyperaceae | 8 |
| Carex vaginata | Tausch | Cyperaceae | 8 |
| Carex vesicaria | L. | Cyperaceae | 8 |
| Carex vulpinoidea | Michx. | Cyperaceae | 8 |
| Cassiope mertensiana | (Bong.) G.Don | Ericaceae | 8 |
| Cassiope tetragona | (L.) D.Don | Ericaceae | 8 |
| Castilleja cusickii | Greenm. | Orobanchaceae | 8 |
| Castilleja hispida | Benth. | Orobanchaceae | 8 |
| Castilleja lutescens | (Greenm.) Rydb. | Orobanchaceae | 8 |
| Castilleja miniata | Douglas ex Benth. | Orobanchaceae | 8 |
| Castilleja occidentalis | Torr. | Orobanchaceae | 8 |
| Castilleja parviflora | Bong. | Orobanchaceae | 8 |
| Castilleja raupii | Pennell | Orobanchaceae | 8 |
| Castilleja rhexiifolia | Rydb. | Orobanchaceae | 8 |
| Castilleja septentrionalis | Lindl. | Orobanchaceae | 8 |
| Castilleja sessiliflora | Pursh | Orobanchaceae | 8 |
| Catabrosa aquatica | (L.) P.Beauv. | Poaceae | 8 |
| Ceanothus velutinus | Douglas | Rhamnaceae | 8 |
| Cerastium beeringianum | Cham. & Schltdl. | Caryophyllaceae | 8 |
| Cerastium brachypodum | (Engelm. ex A.Gray) B.L.Rob. | Caryophyllaceae | 8 |
| Cerastium nutans | Raf. | Caryophyllaceae | 8 |
| Ceratophyllum demersum | L. | Ceratophyllaceae | 8 |
| Chaenactis douglasii | Hook. & Arn. | Asteraceae | 8 |
| Chamaedaphne calyculata | (L.) Moench | Ericaceae | 8 |
| Chamaerhodos erecta | (L.) Bunge | 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 |
| Chimaphila umbellata | (L.) W.P.C.Barton | Ericaceae | 8 |
| Chrysopsis villosa | (Pursh) Nutt. ex DC. | Asteraceae | 8 |
| Chrysosplenium tetrandrum | (N.Lund) Th.Fr. | Saxifragaceae | 8 |
| Cicuta bulbifera | L. | Apiaceae | 8 |
| Cicuta douglasii | J.M.Coult. & Rose | Apiaceae | 8 |
| Cicuta maculata | L. | Apiaceae | 8 |
| Cicuta virosa | L. | Apiaceae | 8 |
| Cinna latifolia | (Trevir. ex Göpp.) Griseb. | Poaceae | 8 |
| Circaea alpina | L. | Onagraceae | 8 |
| Cirsium drummondii | Torr. & A.Gray | Asteraceae | 8 |
| Cirsium flodmanii | Arthur | Asteraceae | 8 |
| Cirsium foliosum | DC. | Asteraceae | 8 |
| Cirsium hookerianum | Nutt. | Asteraceae | 8 |
| Cirsium scariosum | Nutt. | Asteraceae | 8 |
| Cirsium undulatum | (Nutt.) Spreng. | Asteraceae | 8 |
| Claytonia lanceolata | Pursh | Montiaceae | 8 |
| Claytonia megarhiza | (A.Gray) Parry ex S.Watson | Montiaceae | 8 |
| Clematis ligusticifolia | Nutt. | Ranunculaceae | 8 |
| Clematis occidentalis | (Hornem.) DC. | Ranunculaceae | 8 |
| Cleomella serrulata | (Pursh) Roalson & J.C.Hall | Cleomaceae | 8 |
| Clintonia uniflora | (Menzies ex Schult. & Schult.f.) Kunth | Liliaceae | 8 |
| Collinsia parviflora | Douglas ex Lindl. | Plantaginaceae | 8 |
| Collomia linearis | Nutt. | Polemoniaceae | 8 |
| Comandra umbellata | (L.) Nutt. | Santalaceae | 8 |
| Comarum palustre | L. | Rosaceae | 8 |
| Coptis trifolia | (L.) Salisb. | Ranunculaceae | 8 |
| Corallorhiza maculata | Raf. | Orchidaceae | 8 |
| Corallorhiza mertensiana | Bong. | Orchidaceae | 8 |
| Corallorhiza striata | Lindl. | Orchidaceae | 8 |
| Corallorhiza trifida | Châtel. | Orchidaceae | 8 |
| Coreopsis tinctoria | Nutt. | Asteraceae | 8 |
| Corispermum villosum | Rydb. | Chenopodiaceae | 8 |
| Cornus canadensis | L. | Cornaceae | 8 |
| Cornus sericea | L. | Cornaceae | 8 |
| Corydalis aurea | Willd. | Papaveraceae | 8 |
| Corylus cornuta | Marshall | Betulaceae | 8 |
| Crataegus chrysocarpa | Ashe | Rosaceae | 8 |
| Crataegus douglasii | Lindl. | Rosaceae | 8 |
| Crataegus macracantha | (Lindl.) Lodd. ex Loudon | Rosaceae | 8 |
| Crepis atribarba | A.Heller | Asteraceae | 8 |
| Crepis intermedia | A.Gray | Asteraceae | 8 |
| Crepis occidentalis | Nutt. | Asteraceae | 8 |
| Crucihimalaya virgata | (Nutt.) D.A.German & A.L.Ebel | Brassicaceae | 8 |
| Cryptantha fendleri | (A.Gray) Greene | Boraginaceae | 8 |
| Cryptantha minima | Rydb. | Boraginaceae | 8 |
| Cryptogramma acrostichoides | R.Br. | Pteridaceae | 8 |
| Cryptogramma stelleri | (S.G.Gmel.) Prantl | Pteridaceae | 8 |
| Cuscuta campestris | Yunck. | Convolvulaceae | 8 |
| Cuscuta cephalanthi | Engelm. | Convolvulaceae | 8 |
| Cuscuta gronovii | Willd. | Convolvulaceae | 8 |
| Cymopterus glomeratus | (Nutt.) DC. | Apiaceae | 8 |
| Cyperus schweinitzii | Torr. | Cyperaceae | 8 |
| Cyperus squarrosus | L. | Cyperaceae | 8 |
| Cypripedium acaule | Aiton | Orchidaceae | 8 |
| Cypripedium montanum | Douglas ex Lindl. | Orchidaceae | 8 |
| Cypripedium parviflorum | Salisb. | Orchidaceae | 8 |
| Cypripedium passerinum | Richardson | Orchidaceae | 8 |
| Cystopteris fragilis | (L.) Bernh. | Cystopteridaceae | 8 |
| Cystopteris montana | (Lam.) Bernh. ex Desv. | Cystopteridaceae | 8 |
| Dactylorhiza viridis | (L.) R.M.Bateman, Pridgeon & M.W.Chase | Orchidaceae | 8 |
| Dalea candida | Willd. | Fabaceae | 8 |
| Dalea purpurea | Vent. | Fabaceae | 8 |
| Danthonia californica | Bol. | Poaceae | 8 |
| Danthonia intermedia | Vasey | Poaceae | 8 |
| Danthonia spicata | (L.) Roem. & Schult. | Poaceae | 8 |
| Danthonia unispicata | (Thurb.) Munro ex Macoun | Poaceae | 8 |
| Dasiphora fruticosa | (L.) Rydb. | Rosaceae | 8 |
| Delphinium bicolor | Nutt. | Ranunculaceae | 8 |
| Delphinium glaucum | S.Watson | Ranunculaceae | 8 |
| Dendrolycopodium dendroideum | (Michx.) A.Haines | Lycopodiaceae | 8 |
| Deschampsia elongata | (Hook.) Munro | Poaceae | 8 |
| Descurainia incana | (Bernh. ex Fisch. & C.A.Mey.) Dorn | Brassicaceae | 8 |
| Descurainia incisa | (Engelm.) Britton | Brassicaceae | 8 |
| Descurainia pinnata | (Walter) Britton | Brassicaceae | 8 |
| Dichanthelium lanuginosum | (Elliott) Gould | Poaceae | 8 |
| Dichanthelium leibergii | (Vasey) Freckmann | Poaceae | 8 |
| Dieteria canescens | (Pursh) Nutt. | Asteraceae | 8 |
| Diphasiastrum alpinum | (L.) Holub | Lycopodiaceae | 8 |
| Diphasiastrum complanatum | (L.) Holub | Lycopodiaceae | 8 |
| Diphasiastrum sitchense | (Rupr.) Holub | Lycopodiaceae | 8 |
| Distichlis spicata | (L.) Greene | Poaceae | 8 |
| Doellingeria umbellata | (Mill.) Nees | Asteraceae | 8 |
| Draba albertina | Greene | Brassicaceae | 8 |
| Draba aurea | Vahl ex Hornem. | Brassicaceae | 8 |
| Draba cana | Rydb. | Brassicaceae | 8 |
| Draba densifolia | Nutt. | 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 |
| Dracocephalum parviflorum | Nutt. | Lamiaceae | 8 |
| Drosera anglica | Huds. | Droseraceae | 8 |
| Drosera linearis | Goldie | Droseraceae | 8 |
| Drosera rotundifolia | L. | Droseraceae | 8 |
| Dryas drummondii | Richardson ex Hook. | Rosaceae | 8 |
| Dryas hookeriana | Juz. | Rosaceae | 8 |
| Dryas integrifolia | Vahl | Rosaceae | 8 |
| Drymocallis arguta | (Pursh) Rydb. | Rosaceae | 8 |
| Drymocallis convallaria | (Rydb.) Rydb. | Rosaceae | 8 |
| Dryopteris carthusiana | (Vill.) H.P.Fuchs | Dryopteridaceae | 8 |
| Dryopteris cristata | (L.) A.Gray | Dryopteridaceae | 8 |
| Dryopteris expansa | (C.Presl) Fraser-Jenk. & Jermy | Dryopteridaceae | 8 |
| Dryopteris filix-mas | (L.) Schott | Dryopteridaceae | 8 |
| Dryopteris fragrans | (L.) Schott | Dryopteridaceae | 8 |
| Echinocystis lobata | (Michx.) Torr. & A.Gray | Cucurbitaceae | 8 |
| Elaeagnus commutata | Bernh. ex Rydb. | Elaeagnaceae | 8 |
| Elatine brachysperma | A.Gray | Elatinaceae | 8 |
| Eleocharis acicularis | (L.) Roem. & Schult. | Cyperaceae | 8 |
| Eleocharis elliptica | Kunth | Cyperaceae | 8 |
| Eleocharis engelmannii | Steud. | Cyperaceae | 8 |
| Eleocharis erythropoda | Steud. | Cyperaceae | 8 |
| Eleocharis macrostachya | Britton | Cyperaceae | 8 |
| Eleocharis ovata | (Roth) Roem. & Schult. | Cyperaceae | 8 |
| Eleocharis palustris | (L.) Roem. & Schult. | Cyperaceae | 8 |
| Eleocharis quinqueflora | (Hartmann) O.Schwarz | Cyperaceae | 8 |
| Eleocharis uniglumis | (Link) Schult. | Cyperaceae | 8 |
| Ellisia nyctelea | (L.) L. | Hydrophyllaceae | 8 |
| Elymus albicans | (Scribn. & J.G.Sm.) Á.Löve | Poaceae | 8 |
| Elymus canadensis | L. | Poaceae | 8 |
| Elymus curvatus | Piper | Poaceae | 8 |
| Elymus elymoides | (Raf.) Swezey | Poaceae | 8 |
| Elymus glaucus | Buckley | Poaceae | 8 |
| Elymus lanceolatus | (Scribn. & J.G.Sm.) Gould | Poaceae | 8 |
| Elymus scribneri | (Vasey) M.E.Jones | Poaceae | 8 |
| Elymus smithii | (Rydb.) Gould | Poaceae | 8 |
| Elymus violaceus | (Hornem.) J.Feilberg | Poaceae | 8 |
| Elymus virginicus | L. | Poaceae | 8 |
| Empetrum nigrum | L. | Ericaceae | 8 |
| Epilobium anagallidifolium | Lam. | Onagraceae | 8 |
| Epilobium angustifolium | L. | Onagraceae | 8 |
| Epilobium brachycarpum | C.Presl | Onagraceae | 8 |
| Epilobium ciliatum | Raf. | Onagraceae | 8 |
| Epilobium clavatum | Trel. | Onagraceae | 8 |
| Epilobium hornemannii | Rchb. | Onagraceae | 8 |
| Epilobium lactiflorum | Hausskn. | Onagraceae | 8 |
| Epilobium latifolium | L. | Onagraceae | 8 |
| Epilobium leptophyllum | Raf. | Onagraceae | 8 |
| Epilobium luteum | Pursh | Onagraceae | 8 |
| Epilobium palustre | L. | Onagraceae | 8 |
| Equisetum arvense | L. | Equisetaceae | 8 |
| Equisetum fluviatile | L. | Equisetaceae | 8 |
| Equisetum hyemale | L. | Equisetaceae | 8 |
| Equisetum laevigatum | A.Braun | Equisetaceae | 8 |
| Equisetum palustre | L. | Equisetaceae | 8 |
| Equisetum pratense | Ehrh. | Equisetaceae | 8 |
| Equisetum scirpoides | Michx. | Equisetaceae | 8 |
| Equisetum sylvaticum | L. | Equisetaceae | 8 |
| Equisetum variegatum | Schleich. ex F.Weber & D.Mohr | Equisetaceae | 8 |
| Eremogone capillaris | (Poir.) Fenzl | Caryophyllaceae | 8 |
| Eremogone congesta | (Nutt.) Ikonn. | Caryophyllaceae | 8 |
| Ericameria nauseosa | (Pursh) G.L.Nesom & G.I.Baird | Asteraceae | 8 |
| Erigeron acris | L. | Asteraceae | 8 |
| Erigeron annuus | (L.) Desf. | Asteraceae | 8 |
| Erigeron aureus | Greene | Asteraceae | 8 |
| Erigeron caespitosus | Nutt. | Asteraceae | 8 |
| Erigeron canadensis | L. | Asteraceae | 8 |
| Erigeron compositus | Pursh | Asteraceae | 8 |
| Erigeron divergens | Torr. & A.Gray | Asteraceae | 8 |
| Erigeron flagellaris | A.Gray | Asteraceae | 8 |
| Erigeron glabellus | Nutt. | Asteraceae | 8 |
| Erigeron glacialis | (Nutt.) A.Nelson | Asteraceae | 8 |
| Erigeron humilis | Graham | Asteraceae | 8 |
| Erigeron hyssopifolius | Michx. | Asteraceae | 8 |
| Erigeron lanatus | Hook. | Asteraceae | 8 |
| Erigeron lonchophyllus | Hook. | Asteraceae | 8 |
| Erigeron nivalis | Nutt. | Asteraceae | 8 |
| Erigeron ochroleucus | Nutt. | Asteraceae | 8 |
| Erigeron peregrinus | Greene | Asteraceae | 8 |
| Erigeron philadelphicus | L. | Asteraceae | 8 |
| Erigeron pumilus | Nutt. | Asteraceae | 8 |
| Erigeron speciosus | (Lindl.) DC. | Asteraceae | 8 |
| Erigeron strigosus | Muhl. ex Willd. | Asteraceae | 8 |
| Eriocoma hymenoides | (Roem. & Schult.) Rydb. | Poaceae | 8 |
| Eriocoma nelsonii | (Scribn.) Romasch. | Poaceae | 8 |
| Eriocoma occidentalis | (Thurb. ex S.Watson) Romasch. | Poaceae | 8 |
| Eriocoma richardsonii | (Link) Romasch. | Poaceae | 8 |
| Eriogonum androsaceum | Benth. | Polygonaceae | 8 |
| Eriogonum cernuum | Nutt. | Polygonaceae | 8 |
| Eriogonum flavum | Nutt. | Polygonaceae | 8 |
| Eriogonum ovalifolium | Nutt. | Polygonaceae | 8 |
| Eriogonum umbellatum | Torr. | Polygonaceae | 8 |
| Eriophorum angustifolium | Honck. | Cyperaceae | 8 |
| Eriophorum brachyantherum | Trautv. & C.A.Mey. | Cyperaceae | 8 |
| Eriophorum chamissonis | C.A.Mey. | Cyperaceae | 8 |
| Eriophorum gracile | Roth | Cyperaceae | 8 |
| Eriophorum scheuchzeri | Hoppe | Cyperaceae | 8 |
| Eriophorum vaginatum | L. | Cyperaceae | 8 |
| Eriophorum viridicarinatum | (Engelm.) Fernald | Cyperaceae | 8 |
| Erysimum asperum | (Nutt.) DC. | Brassicaceae | 8 |
| Erysimum coarctatum | Fernald | Brassicaceae | 8 |
| Erysimum pallasii | (Pursh) Fernald | Brassicaceae | 8 |
| Erythranthe breweri | (Greene) G.L.Nesom & N.S.Fraga | 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 tilingii | (Regel) G.L.Nesom | Phrymaceae | 8 |
| Erythronium grandiflorum | Pursh | Liliaceae | 8 |
| Euphorbia glyptosperma | Engelm. | Euphorbiaceae | 8 |
| Euphorbia serpillifolia | Pers. | Euphorbiaceae | 8 |
| Euphrasia subarctica | Raup | Orobanchaceae | 8 |
| Eurybia conspicua | (Lindl.) G.L.Nesom | Asteraceae | 8 |
| Eurybia sibirica | (L.) G.L.Nesom | Asteraceae | 8 |
| Euthamia graminifolia | (L.) Nutt. | Asteraceae | 8 |
| Eutrochium maculatum | (L.) E.E.Lamont | Asteraceae | 8 |
| Fallopia scandens | (L.) Holub | Polygonaceae | 8 |
| Festuca brachyphylla | Schult. & Schult.f. | Poaceae | 8 |
| Festuca idahoensis | Elmer | Poaceae | 8 |
| Festuca occidentalis | Hook. | Poaceae | 8 |
| Festuca octoflora | Walter | Poaceae | 8 |
| Festuca rubra | L. | Poaceae | 8 |
| Fragaria vesca | L. | Rosaceae | 8 |
| Fragaria virginiana | Mill. | Rosaceae | 8 |
| Fritillaria pudica | (Pursh) Spreng. | Liliaceae | 8 |
| Gaillardia aristata | Pursh | Asteraceae | 8 |
| Galearis rotundifolia | (Banks ex Pursh) R.M.Bateman | Orchidaceae | 8 |
| Galium spurium | L. | Rubiaceae | 8 |
| Galium trifidum | L. | Rubiaceae | 8 |
| Galium triflorum | Michx. | Rubiaceae | 8 |
| Gaultheria hispidula | (L.) Muhl. ex Bigelow | Ericaceae | 8 |
| Gaultheria humifusa | (Graham) Rydb. | Ericaceae | 8 |
| Gentiana affinis | Griseb. | Gentianaceae | 8 |
| Gentiana calycosa | Griseb. | Gentianaceae | 8 |
| Gentiana glauca | Pall. | Gentianaceae | 8 |
| Gentiana prostrata | Haenke | Gentianaceae | 8 |
| Gentianella propinqua | (Richardson) J.M.Gillett | Gentianaceae | 8 |
| Gentianopsis virgata | (Raf.) Holub | Gentianaceae | 8 |
| Geocaulon lividum | (Richardson) Fernald | Santalaceae | 8 |
| Geranium bicknellii | Britton | Geraniaceae | 8 |
| Geranium carolinianum | L. | Geraniaceae | 8 |
| Geranium richardsonii | Fisch. & Trautv. | Geraniaceae | 8 |
| Geranium viscosissimum | Fisch. & C.A.Mey. | Geraniaceae | 8 |
| Geum aleppicum | Jacq. | Rosaceae | 8 |
| Geum macrophyllum | Willd. | Rosaceae | 8 |
| Geum rivale | L. | Rosaceae | 8 |
| Geum triflorum | Pursh | Rosaceae | 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 |
| Gnaphalium palustre | Nutt. | Asteraceae | 8 |
| Gnaphalium uliginosum | L. | Asteraceae | 8 |
| Goodyera oblongifolia | Raf. | Orchidaceae | 8 |
| Goodyera repens | (L.) R.Br. | Orchidaceae | 8 |
| Graphephorum canescens | (Buckley) Röser & Tkach | Poaceae | 8 |
| Graphephorum wolfii | (Vasey) Coult. | Poaceae | 8 |
| Gratiola neglecta | Torr. | Plantaginaceae | 8 |
| Grindelia hirsutula | Hook. & Arn. | Asteraceae | 8 |
| Grindelia squarrosa | (Pursh) Dunal | Asteraceae | 8 |
| Gutierrezia sarothrae | (Pursh) Britton & Rusby | Asteraceae | 8 |
| Gymnocarpium continentale | (Petrov.) Pojark. | Cystopteridaceae | 8 |
| Gymnocarpium disjunctum | (Rupr.) Ching | Cystopteridaceae | 8 |
| Gymnocarpium dryopteris | (L.) Newman | Cystopteridaceae | 8 |
| Hackelia deflexa | (Wahlenb.) Opiz | Boraginaceae | 8 |
| Hackelia floribunda | (Lehm.) I.M.Johnst. | Boraginaceae | 8 |
| Hackelia micrantha | (Eastw.) J.L.Gentry | Boraginaceae | 8 |
| Halenia deflexa | (Sm.) Griseb. | Gentianaceae | 8 |
| Halerpestes cymbalaria | Greene | Ranunculaceae | 8 |
| Hammarbya paludosa | (L.) Kuntze | Orchidaceae | 8 |
| Hamogalium bifolium | (S.Watson) Kadereit & Schneew. | Rubiaceae | 8 |
| Hedeoma hispida | Pursh | Lamiaceae | 8 |
| Hedysarum alpinum | L. | Fabaceae | 8 |
| Hedysarum boreale | Nutt. | Fabaceae | 8 |
| Hedysarum sulphurescens | Rydb. | Fabaceae | 8 |
| Helenium autumnale | L. | Asteraceae | 8 |
| Helianthus maximiliani | Schrad. | Asteraceae | 8 |
| Helianthus nuttallii | Torr. & A.Gray | Asteraceae | 8 |
| Helianthus pauciflorus | Nutt. | Asteraceae | 8 |
| Helianthus petiolaris | Nutt. | Asteraceae | 8 |
| Helictochloa hookeri | (Scribn.) Romero Zarco | Poaceae | 8 |
| Heliotropium curassavicum | L. | Heliotropiaceae | 8 |
| Heracleum maximum | W.Bartram | Apiaceae | 8 |
| Hesperostipa comata | (Trin. & Rupr.) Barkworth | Poaceae | 8 |
| Hesperostipa curtiseta | (Hitchc.) Barkworth | Poaceae | 8 |
| Hesperostipa spartea | (Trin.) Barkworth | Poaceae | 8 |
| Heuchera cylindrica | Douglas | Saxifragaceae | 8 |
| Heuchera glabra | Willd. ex Roem. & Schult. | Saxifragaceae | 8 |
| Heuchera parvifolia | Nutt. ex Torr. & A.Gray | Saxifragaceae | 8 |
| Heuchera richardsonii | R.Br. | Saxifragaceae | 8 |
| Hieracium albiflorum | Hook. | Asteraceae | 8 |
| Hieracium scouleri | Hook. | Asteraceae | 8 |
| Hieracium triste | Willd. ex Spreng. | Asteraceae | 8 |
| Hieracium umbellatum | L. | Asteraceae | 8 |
| Hippuris vulgaris | L. | Plantaginaceae | 8 |
| Hordeum brachyantherum | Nevski | Poaceae | 8 |
| Hordeum jubatum | L. | Poaceae | 8 |
| Houstonia longifolia | Gaertn. | Rubiaceae | 8 |
| Hudsonia tomentosa | Nutt. | Cistaceae | 8 |
| Humulus americanus | Nutt. | Cannabaceae | 8 |
| Huperzia continentalis | Testo, A.Haines & A.V.Gilman | Lycopodiaceae | 8 |
| Huperzia occidentalis | (Clute) Kartesz & Gandhi | Lycopodiaceae | 8 |
| Huperzia selago | (L.) Bernh. ex Schrank & Mart. | Lycopodiaceae | 8 |
| Hydrophyllum capitatum | Douglas ex Benth. | Hydrophyllaceae | 8 |
| Hymenopappus filifolius | Hook. | Asteraceae | 8 |
| Hymenoxys richardsonii | Cockerell | Asteraceae | 8 |
| Hypericum majus | (A.Gray) Britton | Hypericaceae | 8 |
| Hypericum scouleri | Hook. | Hypericaceae | 8 |
| Hypopitys monotropa | Crantz | Ericaceae | 8 |
| Iliamna rivularis | (Douglas) Greene | Malvaceae | 8 |
| Impatiens capensis | Meerb. | Balsaminaceae | 8 |
| Impatiens noli-tangere | L. | Balsaminaceae | 8 |
| Iris missouriensis | Nutt. | Iridaceae | 8 |
| Isoetes bolanderi | Engelm. | Isoetaceae | 8 |
| Isoetes echinospora | Durieu | Isoetaceae | 8 |
| Iva axillaris | Pursh | Asteraceae | 8 |
| Juncus alpinoarticulatus | Chaix | Juncaceae | 8 |
| Juncus arcticus | Willd. | Juncaceae | 8 |
| Juncus balticus | Willd. | Juncaceae | 8 |
| Juncus bufonius | L. | Juncaceae | 8 |
| Juncus castaneus | Sm. | Juncaceae | 8 |
| Juncus drummondii | E.Mey. | Juncaceae | 8 |
| Juncus dudleyi | Wiegand | Juncaceae | 8 |
| Juncus ensifolius | Wikstr. | Juncaceae | 8 |
| Juncus filiformis | L. | Juncaceae | 8 |
| Juncus mertensianus | Bong. | Juncaceae | 8 |
| Juncus nodosus | L. | Juncaceae | 8 |
| Juncus parryi | Engelm. | Juncaceae | 8 |
| Juncus stygius | L. | Juncaceae | 8 |
| Juncus torreyi | Coville | Juncaceae | 8 |
| Juncus tweedyi | Rydb. | Juncaceae | 8 |
| Juniperus horizontalis | Moench | Cupressaceae | 8 |
| Juniperus scopulorum | Sarg. | Cupressaceae | 8 |
| Kalmia microphylla | (Hook.) A.Heller | Ericaceae | 8 |
| Kalmia polifolia | Wangenh. | Ericaceae | 8 |
| Kalmia procumbens | (L.) Gift, Kron & P.F.Stevens ex Galasso, Banfi & F.Conti | Ericaceae | 8 |
| Koeleria macrantha | (Ledeb.) Schult. | Poaceae | 8 |
| Koeleria spicata | (L.) Barberá, Quintanar, Soreng & P.M.Peterson | Poaceae | 8 |
| Krascheninnikovia ceratoides | (L.) Gueldenst. | Chenopodiaceae | 8 |
| Lactuca biennis | (Moench) Fernald | Asteraceae | 8 |
| Lactuca oblongifolia | Nutt. | Asteraceae | 8 |
| Lappula occidentalis | (S.Watson) Greene | Boraginaceae | 8 |
| Larix laricina | (Du Roi) K.Koch | Pinaceae | 8 |
| Larix lyallii | Parl. | Pinaceae | 8 |
| Larix occidentalis | Nutt. | Pinaceae | 8 |
| Lathyrus ochroleucus | Hook. | Fabaceae | 8 |
| Lathyrus venosus | Muhl. ex Willd. | Fabaceae | 8 |
| Lechea intermedia | Legg. ex Britton | Cistaceae | 8 |
| Lemna trisulca | L. | Araceae | 8 |
| Lemna turionifera | Landolt | Araceae | 8 |
| Lepidium densiflorum | Schrad. | Brassicaceae | 8 |
| Leptarrhena pyrolifolia | (D.Don) Ser. | Saxifragaceae | 8 |
| Leptosiphon septentrionalis | (H.Mason) J.M.Porter & L.A.Johnson | Polemoniaceae | 8 |
| Lewisia pygmaea | (A.Gray) B.L.Rob. | Montiaceae | 8 |
| Lewisia rediviva | Pursh | Montiaceae | 8 |
| Leymus cinereus | (Scribn. & Merr.) Á.Löve | Poaceae | 8 |
| Leymus flavescens | (Scribn. & J.G.Sm.) Pilg. | Poaceae | 8 |
| Leymus innovatus | (Beal) Pilg. | Poaceae | 8 |
| Leymus mollis | (Trin.) Pilg. | Poaceae | 8 |
| Liatris ligulistylis | (A.Nelson) K.Schum. | Asteraceae | 8 |
| Liatris punctata | Hook. | Asteraceae | 8 |
| Lilium philadelphicum | L. | Liliaceae | 8 |
| Limosella aquatica | L. | Plantaginaceae | 8 |
| Linnaea borealis | L. | Caprifoliaceae | 8 |
| Linum australe | A.Heller | Linaceae | 8 |
| Linum compactum | A.Nelson | Linaceae | 8 |
| Linum lewisii | Pursh | Linaceae | 8 |
| Linum rigidum | Pursh | Linaceae | 8 |
| Liparis loeselii | (L.) Rich. | Orchidaceae | 8 |
| Lithophragma glabrum | Nutt. | Saxifragaceae | 8 |
| Lithophragma parviflorum | (Hook.) Nutt. | Saxifragaceae | 8 |
| Lithospermum incisum | Lehm. | Boraginaceae | 8 |
| Lithospermum occidentale | (Mack.) Weakley, Witsell & D.Estes | Boraginaceae | 8 |
| Lithospermum ruderale | Douglas ex Lehm. | Boraginaceae | 8 |
| Lobelia kalmii | L. | Campanulaceae | 8 |
| Lobelia spicata | Lam. | Campanulaceae | 8 |
| Lomatium cous | (S.Watson) J.M.Coult. & Rose | Apiaceae | 8 |
| Lomatium foeniculaceum | (Nutt.) J.M.Coult. & Rose | Apiaceae | 8 |
| Lomatium multifidum | (Nutt.) R.P.McNeill & Darrach | Apiaceae | 8 |
| Lomatium sandbergii | (J.M.Coult. & Rose) J.M.Coult. & Rose | Apiaceae | 8 |
| Lomatogonium rotatum | (L.) Fernald | Gentianaceae | 8 |
| Lonicera caerulea | L. | Caprifoliaceae | 8 |
| Lonicera dioica | L. | Caprifoliaceae | 8 |
| Lonicera involucrata | (Richardson) Banks ex Spreng. | Caprifoliaceae | 8 |
| Lonicera utahensis | S.Watson | Caprifoliaceae | 8 |
| Lonicera villosa | (Michx.) Schult. | Caprifoliaceae | 8 |
| Luetkea pectinata | (Pursh) Kuntze | Rosaceae | 8 |
| Lupinus argenteus | Pursh | Fabaceae | 8 |
| Lupinus nootkatensis | Donn ex Sims | Fabaceae | 8 |
| Lupinus polyphyllus | Lindl. | Fabaceae | 8 |
| Lupinus pusillus | Pursh | Fabaceae | 8 |
| Luzula comosa | E.Mey. | Juncaceae | 8 |
| Luzula multiflora | (Ehrh.) Lej. | Juncaceae | 8 |
| Luzula parviflora | (Ehrh.) Desv. | Juncaceae | 8 |
| Luzula rufescens | Fisch. ex E.Mey. | Juncaceae | 8 |
| Luzula spicata | (L.) DC. | Juncaceae | 8 |
| Lycopodiella inundata | (L.) Holub | Lycopodiaceae | 8 |
| Lycopodium lagopus | Zinserl. ex Kuzen. | Lycopodiaceae | 8 |
| Lycopus americanus | Muhl. ex W.P.C.Barton | Lamiaceae | 8 |
| Lycopus asper | Greene | Lamiaceae | 8 |
| Lycopus uniflorus | Michx. | Lamiaceae | 8 |
| Lygodesmia juncea | (Pursh) Sweet | Asteraceae | 8 |
| Lysimachia borealis | (Raf.) U.Manns & Anderb. | Primulaceae | 8 |
| Lysimachia ciliata | L. | Primulaceae | 8 |
| Lysimachia europaea | (L.) U.Manns & Anderb. | Primulaceae | 8 |
| Lysimachia hybrida | Michx. | Primulaceae | 8 |
| Lysimachia maritima | (L.) Galasso, Banfi & Soldano | Primulaceae | 8 |
| Lysimachia minima | (L.) U.Manns & Anderb. | Primulaceae | 8 |
| Lysimachia thyrsiflora | L. | Primulaceae | 8 |
| Machaeranthera tanacetifolia | (Kunth) Nees | Asteraceae | 8 |
| Madia glomerata | Hook. | Asteraceae | 8 |
| Maianthemum canadense | Desf. | Asparagaceae | 8 |
| Maianthemum racemosum | (L.) Link | Asparagaceae | 8 |
| Maianthemum stellatum | (L.) Link | Asparagaceae | 8 |
| Maianthemum trifolium | (L.) Sloboda | Asparagaceae | 8 |
| Malaxis monophyllos | (L.) Sw. | Orchidaceae | 8 |
| Marsilea vestita | Hook. & Grev. | Marsileaceae | 8 |
| Matricaria discoidea | DC. | Asteraceae | 8 |
| Melica subulata | (Griseb.) Scribn. | Poaceae | 8 |
| Mentha canadensis | L. | Lamiaceae | 8 |
| Mentzelia decapetala | (Sims) Urb. | Loasaceae | 8 |
| Menyanthes trifoliata | L. | Menyanthaceae | 8 |
| Mertensia lanceolata | (Pursh) DC. | Boraginaceae | 8 |
| Mertensia longiflora | Greene | Boraginaceae | 8 |
| Micranthes ferruginea | (Graham) Brouillet & Gornall | Saxifragaceae | 8 |
| Micranthes lyallii | (Engl.) Small | Saxifragaceae | 8 |
| Micranthes mertensiana | Rosend. | Saxifragaceae | 8 |
| Micranthes nelsoniana | (D.Don) Small | Saxifragaceae | 8 |
| Micranthes nivalis | (L.) Small | Saxifragaceae | 8 |
| Micranthes occidentalis | (S.Watson) Small | Saxifragaceae | 8 |
| Micranthes odontoloma | A.Heller | Saxifragaceae | 8 |
| Micranthes oregana | (Howell) Small | Saxifragaceae | 8 |
| Microseris nutans | (Hook.) Sch.Bip. | Asteraceae | 8 |
| Microsteris gracilis | (Hook.) Greene | Polemoniaceae | 8 |
| Mirabilis albida | (Walter) Heimerl | Nyctaginaceae | 8 |
| Mirabilis linearis | (Pursh) Heimerl | Nyctaginaceae | 8 |
| Mitella nuda | L. | Saxifragaceae | 8 |
| Moehringia lateriflora | (L.) Fenzl | Caryophyllaceae | 8 |
| Monarda fistulosa | L. | Lamiaceae | 8 |
| Moneses uniflora | (L.) A.Gray | Ericaceae | 8 |
| Monotropa uniflora | L. | Ericaceae | 8 |
| Montia linearis | (Douglas ex Hook.) Greene | Montiaceae | 8 |
| Montia parvifolia | (Moc. ex DC.) Greene | Montiaceae | 8 |
| Muhlenbergia asperifolia | (Nees & Meyen ex Trin.) Parodi | Poaceae | 8 |
| Muhlenbergia cuspidata | (Torr. ex Hook.) Rydb. | Poaceae | 8 |
| Muhlenbergia glomerata | (Willd.) Trin. | Poaceae | 8 |
| Muhlenbergia paniculata | (Nutt.) P.M.Peterson | Poaceae | 8 |
| Muhlenbergia racemosa | (Michx.) Britton, Sterns & Poggenb. | Poaceae | 8 |
| Muhlenbergia richardsonis | (Trin.) Rydb. | Poaceae | 8 |
| Munroa squarrosa | (Nutt.) Torr. | Poaceae | 8 |
| Musineon divaricatum | (Pursh) Nutt. | Apiaceae | 8 |
| Myosotis asiatica | (Vestergr.) Schischk. & Serg. | Boraginaceae | 8 |
| Myosotis laxa | Lehm. | Boraginaceae | 8 |
| Myrica gale | L. | Myricaceae | 8 |
| Myriophyllum sibiricum | Kom. | Haloragaceae | 8 |
| Myriophyllum verticillatum | L. | Haloragaceae | 8 |
| Myriopteris gracillima | J.Sm. | Pteridaceae | 8 |
| Nabalus alatus | Hook. | Asteraceae | 8 |
| Nabalus racemosus | (Michx.) Hook. | Asteraceae | 8 |
| Nabalus sagittatus | (A.Gray) Rydb. | Asteraceae | 8 |
| Najas flexilis | (Willd.) Rostk. & W.L.E.Schmidt | Hydrocharitaceae | 8 |
| Najas guadalupensis | (Spreng.) Magnus | Hydrocharitaceae | 8 |
| Nassella viridula | (Trin.) Barkworth | Poaceae | 8 |
| Navarretia leucocephala | Benth. | Polemoniaceae | 8 |
| Nemophila breviflora | A.Gray | Hydrophyllaceae | 8 |
| Neoholmgrenia andina | (Nutt.) W.L.Wagner & Hoch | Onagraceae | 8 |
| Neottia banksiana | (Lindl.) Rchb.f. | Orchidaceae | 8 |
| Neottia borealis | (Morong) Szlach. | Orchidaceae | 8 |
| Neottia convallarioides | (Sw.) Rich. | Orchidaceae | 8 |
| Neottia cordata | (L.) Rich. | Orchidaceae | 8 |
| Nothocalais cuspidata | (Pursh) Greene | Asteraceae | 8 |
| Nuphar variegata | Engelm. ex Durand | Nymphaeaceae | 8 |
| Nuttallanthus texanus | (Scheele) D.A.Sutton | Plantaginaceae | 8 |
| Nymphaea leibergii | Morong | Nymphaeaceae | 8 |
| Nymphaea tetragona | Georgi | Nymphaeaceae | 8 |
| Oenothera biennis | L. | Onagraceae | 8 |
| Oenothera cespitosa | Nutt. | Onagraceae | 8 |
| Oenothera flava | (A.Nelson) Garrett | Onagraceae | 8 |
| Oenothera nuttallii | Torr. & A.Gray | Onagraceae | 8 |
| Oenothera serrulata | Nutt. | Onagraceae | 8 |
| Oenothera suffrutescens | (Ser.) W.L.Wagner & Hoch | Onagraceae | 8 |
| Oenothera villosa | Thunb. | Onagraceae | 8 |
| Oplopanax horridus | (Sm.) Miq. | Araliaceae | 8 |
| Opuntia fragilis | (Nutt.) Haw. | Cactaceae | 8 |
| Opuntia polyacantha | Haw. | Cactaceae | 8 |
| Oreocarya caespitosa | A.Nelson | Boraginaceae | 8 |
| Oreocarya glomerata | Greene | Boraginaceae | 8 |
| Oreomecon pygmaea | (Rydb.) Krivenko | Papaveraceae | 8 |
| Orobanche corymbosa | (Rydb.) Ferris | Orobanchaceae | 8 |
| Orobanche fasciculata | Nutt. | Orobanchaceae | 8 |
| Orobanche ludoviciana | Nutt. | Orobanchaceae | 8 |
| Orobanche uniflora | L. | Orobanchaceae | 8 |
| Orthilia secunda | (L.) House | Ericaceae | 8 |
| Orthocarpus luteus | Nutt. | Orobanchaceae | 8 |
| Oryzopsis asperifolia | Michx. | Poaceae | 8 |
| Osmorhiza berteroi | DC. | Apiaceae | 8 |
| Osmorhiza depauperata | Phil. | Apiaceae | 8 |
| Osmorhiza longistylis | DC. | Apiaceae | 8 |
| Osmorhiza occidentalis | Torr. | Apiaceae | 8 |
| Oxybaphus nyctagineus | (Michx.) Sweet | Nyctaginaceae | 8 |
| Oxyria digyna | (L.) Hill | Polygonaceae | 8 |
| Oxytropis borealis | DC. | Fabaceae | 8 |
| Oxytropis campestris | (L.) DC. | Fabaceae | 8 |
| Oxytropis deflexa | (Pall.) DC. | Fabaceae | 8 |
| Oxytropis lagopus | Nutt. | Fabaceae | 8 |
| Oxytropis podocarpa | A.Gray | Fabaceae | 8 |
| Oxytropis sericea | Nutt. | Fabaceae | 8 |
| Oxytropis splendens | Douglas | Fabaceae | 8 |
| Ozomelis trifida | (Graham) Rydb. | Saxifragaceae | 8 |
| Packera cana | (Hook.) W.A.Weber & Á.Löve | Asteraceae | 8 |
| Packera cymbalaria | (Pursh) W.A.Weber & Á.Löve | Asteraceae | 8 |
| Packera indecora | (Greene) Á.Löve & D.Löve | Asteraceae | 8 |
| Packera pauciflora | (Pursh) Á.Löve & D.Löve | Asteraceae | 8 |
| Packera paupercula | (Michx.) Á.Löve & D.Löve | Asteraceae | 8 |
| Packera pseudaurea | (Rydb.) W.A.Weber & Á.Löve | Asteraceae | 8 |
| Packera streptanthifolia | (Greene) W.A.Weber & Á.Löve | Asteraceae | 8 |
| Panicum capillare | L. | Poaceae | 8 |
| Parietaria pensylvanica | Muhl. ex Willd. | Urticaceae | 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 |
| Paxistima myrsinites | (Pursh) Raf. | Celastraceae | 8 |
| Pectiantia pentandra | (Hook.) Rydb. | Saxifragaceae | 8 |
| Pedicularis bracteosa | Benth. | Orobanchaceae | 8 |
| Pedicularis capitata | Adams | Orobanchaceae | 8 |
| Pedicularis contorta | Benth. | Orobanchaceae | 8 |
| Pedicularis flammea | L. | Orobanchaceae | 8 |
| Pedicularis groenlandica | Retz. | Orobanchaceae | 8 |
| Pedicularis labradorica | Wirsing | Orobanchaceae | 8 |
| Pedicularis lanata | Cham. & Schltdl. | Orobanchaceae | 8 |
| Pedicularis langsdorffii | Fisch. ex Steven | Orobanchaceae | 8 |
| Pedicularis oederi | Vahl | Orobanchaceae | 8 |
| Pedicularis racemosa | Douglas ex Benth. | Orobanchaceae | 8 |
| Pedicularis sudetica | Willd. | Orobanchaceae | 8 |
| Pelecyphora vivipara | (Nutt.) D.Aquino & Dan.Sánchez | Cactaceae | 8 |
| Pellaea gastonyi | Windham | Pteridaceae | 8 |
| Pellaea glabella | Mett. | Pteridaceae | 8 |
| Penstemon albertinus | Greene | Plantaginaceae | 8 |
| Penstemon albidus | Nutt. | Plantaginaceae | 8 |
| Penstemon confertus | Douglas | Plantaginaceae | 8 |
| Penstemon ellipticus | J.M.Coult. & Fisher | Plantaginaceae | 8 |
| Penstemon eriantherus | Nutt. ex Pursh | Plantaginaceae | 8 |
| Penstemon fruticosus | (Pursh) Greene | Plantaginaceae | 8 |
| Penstemon gracilis | Nutt. | Plantaginaceae | 8 |
| Penstemon lyallii | (A.Gray) A.Gray | Plantaginaceae | 8 |
| Penstemon nitidus | Douglas ex Benth. | Plantaginaceae | 8 |
| Penstemon procerus | Douglas ex Graham | Plantaginaceae | 8 |
| Persicaria amphibia | (L.) Delarbre | Polygonaceae | 8 |
| Persicaria lapathifolia | (L.) Delarbre | Polygonaceae | 8 |
| Persicaria vivipara | (L.) Ronse Decr. | Polygonaceae | 8 |
| Petasites frigidus | (L.) Fr. | Asteraceae | 8 |
| Phacelia franklinii | (R.Br.) A.Gray | Hydrophyllaceae | 8 |
| Phacelia hastata | Douglas ex Lehm. | Hydrophyllaceae | 8 |
| Phacelia linearis | (Pursh) Holz. | Hydrophyllaceae | 8 |
| Phacelia lyallii | (A.Gray) Rydb. | Hydrophyllaceae | 8 |
| Phacelia sericea | (Graham) A.Gray | Hydrophyllaceae | 8 |
| Phalaris arundinacea | L. | Poaceae | 8 |
| Phegopteris connectilis | (Michx.) Watt | Thelypteridaceae | 8 |
| Philadelphus lewisii | Pursh | Hydrangeaceae | 8 |
| Phippsia algida | (Sol.) R.Br. | Poaceae | 8 |
| Phleum alpinum | L. | Poaceae | 8 |
| Phlox alyssifolia | Greene | Polemoniaceae | 8 |
| Phlox diffusa | Benth. | Polemoniaceae | 8 |
| Phlox hoodii | Richardson | Polemoniaceae | 8 |
| Phragmites australis | (Cav.) Steud. | Poaceae | 8 |
| Phyllodoce empetriformis | (Sm.) D.Don | Ericaceae | 8 |
| Phyllodoce glanduliflora | (Hook.) Coville | Ericaceae | 8 |
| Physaria arenosa | (Richardson) O'Kane & Al-Shehbaz | Brassicaceae | 8 |
| Physaria didymocarpa | (Hook.) A.Gray | Brassicaceae | 8 |
| Physaria spatulata | (Rydb.) Grady & O'Kane | Brassicaceae | 8 |
| Physostegia virginiana | (L.) Benth. | Lamiaceae | 8 |
| Picea engelmannii | Parry ex Engelm. | Pinaceae | 8 |
| Picea glauca | (Moench) Voss | Pinaceae | 8 |
| Picea mariana | Britton, Sterns & Poggenb. | Pinaceae | 8 |
| Pinguicula macroceras | Pall. ex Link | Lentibulariaceae | 8 |
| Pinguicula villosa | L. | Lentibulariaceae | 8 |
| Pinguicula vulgaris | L. | Lentibulariaceae | 8 |
| Pinus albicaulis | Engelm. | Pinaceae | 8 |
| Pinus banksiana | Lamb. | Pinaceae | 8 |
| Pinus contorta | Douglas ex Loudon | Pinaceae | 8 |
| Pinus flexilis | E.James | Pinaceae | 8 |
| Pinus monticola | Douglas ex D.Don | Pinaceae | 8 |
| Piptatheropsis exigua | (Thurb.) Romasch., P.M.Peterson & Soreng | Poaceae | 8 |
| Piptatheropsis micrantha | (Trin. & Rupr.) Romasch., P.M.Peterson & Soreng | Poaceae | 8 |
| Piptatheropsis pungens | (Torr. ex Spreng.) Romasch., P.M.Peterson & Soreng | Poaceae | 8 |
| Plagiobothrys scouleri | (Hook. & Arn.) I.M.Johnst. | Boraginaceae | 8 |
| Plantago canescens | Adams | Plantaginaceae | 8 |
| Plantago elongata | Pursh | Plantaginaceae | 8 |
| Plantago maritima | L. | Plantaginaceae | 8 |
| Plantago patagonica | Jacq. | Plantaginaceae | 8 |
| Platanthera aquilonis | Sheviak | Orchidaceae | 8 |
| Platanthera dilatata | (Pursh) Lindl. ex L.C.Beck | Orchidaceae | 8 |
| Platanthera huronensis | Lindl. | Orchidaceae | 8 |
| Platanthera obtusata | (Banks ex Pursh) Lindl. | Orchidaceae | 8 |
| Platanthera orbiculata | (Pursh) Lindl. | Orchidaceae | 8 |
| Platanthera stricta | Lindl. | Orchidaceae | 8 |
| Platanthera unalascensis | (Spreng.) Kurtz | Orchidaceae | 8 |
| Poa alpina | L. | Poaceae | 8 |
| Poa arctica | R.Br. | 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 occidentale | Greene | Polemoniaceae | 8 |
| Polemonium pulcherrimum | Hook. | Polemoniaceae | 8 |
| Polemonium villosum | Rudolph ex Georgi | Polemoniaceae | 8 |
| Polemonium viscosum | Nutt. | Polemoniaceae | 8 |
| Polygala senega | L. | Polygalaceae | 8 |
| Polygonum achoreum | S.F.Blake | Polygonaceae | 8 |
| Polygonum aviculare | L. | Polygonaceae | 8 |
| Polygonum minimum | S.Watson | Polygonaceae | 8 |
| Polypodium hesperium | Maxon | Polypodiaceae | 8 |
| Polypodium sibiricum | Sipliv. | Polypodiaceae | 8 |
| Polystichum lonchitis | (L.) Roth | Dryopteridaceae | 8 |
| Populus angustifolia | E.James | Salicaceae | 8 |
| Populus balsamifera | L. | Salicaceae | 8 |
| Populus deltoides | W.Bartram ex Marshall | Salicaceae | 8 |
| Populus tremuloides | Michx. | Salicaceae | 8 |
| Potamogeton alpinus | Balb. | Potamogetonaceae | 8 |
| Potamogeton amplifolius | Tuck. | Potamogetonaceae | 8 |
| Potamogeton berchtoldii | Fieber | Potamogetonaceae | 8 |
| Potamogeton foliosus | Raf. | Potamogetonaceae | 8 |
| Potamogeton friesii | Rupr. | Potamogetonaceae | 8 |
| Potamogeton gramineus | L. | Potamogetonaceae | 8 |
| Potamogeton natans | L. | Potamogetonaceae | 8 |
| Potamogeton nodosus | Poir. | Potamogetonaceae | 8 |
| Potamogeton obtusifolius | Mert. & W.D.J.Koch | Potamogetonaceae | 8 |
| Potamogeton praelongus | Wulfen | Potamogetonaceae | 8 |
| Potamogeton pusillus | L. | Potamogetonaceae | 8 |
| Potamogeton richardsonii | Rydb. | Potamogetonaceae | 8 |
| Potamogeton robbinsii | Oakes | Potamogetonaceae | 8 |
| Potamogeton strictifolius | A.Benn. | Potamogetonaceae | 8 |
| Potamogeton zosteriformis | Fernald | Potamogetonaceae | 8 |
| Potentilla arenosa | (Turcz.) Juz. | Rosaceae | 8 |
| Potentilla biennis | Greene | Rosaceae | 8 |
| Potentilla bimundorum | Soják | Rosaceae | 8 |
| Potentilla concinna | Richardson | Rosaceae | 8 |
| Potentilla drummondii | Lehm. | Rosaceae | 8 |
| Potentilla effusa | Douglas ex Lehm. | Rosaceae | 8 |
| Potentilla flabellifolia | Hook. ex Torr. & A.Gray | Rosaceae | 8 |
| Potentilla glaucophylla | Lehm. | Rosaceae | 8 |
| Potentilla gracilis | Douglas ex Hook. | Rosaceae | 8 |
| Potentilla hippiana | Lehm. | Rosaceae | 8 |
| Potentilla hyparctica | Malte | Rosaceae | 8 |
| Potentilla litoralis | Rydb. | Rosaceae | 8 |
| Potentilla nivea | L. | 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 subvahliana | Jurtzev | Rosaceae | 8 |
| Potentilla supina | L. | Rosaceae | 8 |
| Primula conjugens | (Greene) A.R.Mast & Reveal | Primulaceae | 8 |
| Primula egaliksensis | Wormsk. | Primulaceae | 8 |
| Primula incana | M.E.Jones | Primulaceae | 8 |
| Primula mistassinica | Michx. | Primulaceae | 8 |
| Primula pauciflora | (Greene) A.R.Mast & Reveal | Primulaceae | 8 |
| Prosartes hookeri | Torr. | Liliaceae | 8 |
| Prosartes trachycarpa | S.Watson | Liliaceae | 8 |
| Prunella vulgaris | L. | Lamiaceae | 8 |
| Prunus pensylvanica | L.f. | Rosaceae | 8 |
| Prunus virginiana | L. | Rosaceae | 8 |
| Pseudognaphalium macounii | (Greene) Kartesz | Asteraceae | 8 |
| Pseudoroegneria spicata | (Pursh) Á.Löve | Poaceae | 8 |
| Pseudotsuga menziesii | (Mirb.) Franco | Pinaceae | 8 |
| Psilocarphus brevissimus | Nutt. | Asteraceae | 8 |
| Pteridium aquilinum | (L.) Kuhn | Dennstaedtiaceae | 8 |
| Pterospora andromedea | Nutt. | Ericaceae | 8 |
| Puccinellia nuttalliana | (Schult.) Hitchc. | Poaceae | 8 |
| Pulsatilla nuttalliana | (DC.) Spreng. | Ranunculaceae | 8 |
| Pulsatilla occidentalis | (S.Watson) Freyn | Ranunculaceae | 8 |
| Pyrola asarifolia | Michx. | Ericaceae | 8 |
| Pyrola chlorantha | Sw. | Ericaceae | 8 |
| Pyrola elliptica | Nutt. | Ericaceae | 8 |
| Pyrola grandiflora | Radius | Ericaceae | 8 |
| Pyrola minor | L. | Ericaceae | 8 |
| Pyrola picta | Sm. | Ericaceae | 8 |
| Quercus macrocarpa | Michx. | Fagaceae | 8 |
| Ranunculus abortivus | L. | Ranunculaceae | 8 |
| Ranunculus cardiophyllus | Hook. | 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 lapponicus | L. | Ranunculaceae | 8 |
| Ranunculus macounii | Britton | Ranunculaceae | 8 |
| Ranunculus minimus | E.H.L.Krause | Ranunculaceae | 8 |
| Ranunculus nivalis | L. | Ranunculaceae | 8 |
| Ranunculus occidentalis | Nutt. | Ranunculaceae | 8 |
| Ranunculus pensylvanicus | L.f. | Ranunculaceae | 8 |
| Ranunculus pygmaeus | Wahlenb. | Ranunculaceae | 8 |
| Ranunculus reptans | L. | Ranunculaceae | 8 |
| Ranunculus rhomboideus | Goldie | Ranunculaceae | 8 |
| Ranunculus sceleratus | L. | Ranunculaceae | 8 |
| Ranunculus trichophyllus | Chaix | Ranunculaceae | 8 |
| Ranunculus uncinatus | D.Don ex G.Don | Ranunculaceae | 8 |
| Ratibida columnifera | (Nutt.) Wooton & Standl. | Asteraceae | 8 |
| Rhamnus alnifolia | L'Hér. | Rhamnaceae | 8 |
| Rhinanthus groenlandicus | Chabert | Orobanchaceae | 8 |
| Rhodiola integrifolia | Raf. | Crassulaceae | 8 |
| Rhododendron albiflorum | Hook. | Ericaceae | 8 |
| Rhododendron columbianum | (Piper) Harmaja | Ericaceae | 8 |
| Rhododendron groenlandicum | (Oeder) Kron & Judd | Ericaceae | 8 |
| Rhododendron lapponicum | (L.) Wahlenb. | Ericaceae | 8 |
| Rhododendron menziesii | Craven | Ericaceae | 8 |
| Rhododendron tomentosum | Harmaja | Ericaceae | 8 |
| Rhus aromatica | Aiton | Anacardiaceae | 8 |
| Rhynchospora alba | (L.) Vahl | Cyperaceae | 8 |
| Rhynchospora capillacea | Torr. | Cyperaceae | 8 |
| Ribes americanum | Mill. | Grossulariaceae | 8 |
| Ribes aureum | Pursh | Grossulariaceae | 8 |
| Ribes cereum | Douglas | Grossulariaceae | 8 |
| Ribes glandulosum | Weber | Grossulariaceae | 8 |
| Ribes hirtellum | Michx. | Grossulariaceae | 8 |
| Ribes hudsonianum | Richardson | Grossulariaceae | 8 |
| Ribes inerme | Rydb. | Grossulariaceae | 8 |
| Ribes lacustre | (Pers.) Poir. | Grossulariaceae | 8 |
| Ribes laxiflorum | Pursh | Grossulariaceae | 8 |
| Ribes oxyacanthoides | L. | Grossulariaceae | 8 |
| Ribes triste | Pall. | Grossulariaceae | 8 |
| Ribes viscosissimum | Pursh | Grossulariaceae | 8 |
| Romanzoffia sitchensis | Bong. | Hydrophyllaceae | 8 |
| Rorippa curvipes | Greene | Brassicaceae | 8 |
| Rorippa palustris | (L.) Besser | Brassicaceae | 8 |
| Rosa acicularis | Lindl. | Rosaceae | 8 |
| Rosa arkansana | Porter | Rosaceae | 8 |
| Rubus arcticus | L. | Rosaceae | 8 |
| Rubus parviflorus | Nutt. | Rosaceae | 8 |
| Rubus pedatus | Sm. | Rosaceae | 8 |
| Rubus pubescens | Raf. | Rosaceae | 8 |
| Rumex alpestris | Jacq. | Polygonaceae | 8 |
| Rumex britannica | L. | Polygonaceae | 8 |
| Rumex maritimus | L. | Polygonaceae | 8 |
| Rumex occidentalis | S.Watson | Polygonaceae | 8 |
| Rumex paucifolius | Nutt. | Polygonaceae | 8 |
| Rumex triangulivalvis | (Danser) Rech.f. | Polygonaceae | 8 |
| Rumex venosus | Pursh | Polygonaceae | 8 |
| Ruppia cirrhosa | (Petagna) Grande | Ruppiaceae | 8 |
| Sabulina austromontana | (S.J.Wolf & Packer) Dillenb. & Kadereit | Caryophyllaceae | 8 |
| Sabulina dawsonensis | (Britton) Rydb. | Caryophyllaceae | 8 |
| Sabulina nuttallii | (Pax) Dillenb. & Kadereit | Caryophyllaceae | 8 |
| Sabulina rubella | (Wahlenb.) Dillenb. & Kadereit | Caryophyllaceae | 8 |
| Sagina nodosa | (L.) Fenzl | Caryophyllaceae | 8 |
| Sagina saginoides | (L.) H.Karst. | Caryophyllaceae | 8 |
| Sagittaria cuneata | E.Sheld. | Alismataceae | 8 |
| Sagittaria latifolia | Willd. | Alismataceae | 8 |
| Salicornia rubra | A.Nelson | Chenopodiaceae | 8 |
| Salix alaxensis | (Andersson) Coville | Salicaceae | 8 |
| Salix amygdaloides | Andersson | Salicaceae | 8 |
| Salix arctica | Pall. | Salicaceae | 8 |
| Salix barclayi | Andersson | Salicaceae | 8 |
| Salix barrattiana | Hook. | Salicaceae | 8 |
| Salix bebbiana | Sarg. | Salicaceae | 8 |
| Salix boothii | Dorn | Salicaceae | 8 |
| Salix brachycarpa | Nutt. | Salicaceae | 8 |
| Salix candida | Flüggé ex Willd. | Salicaceae | 8 |
| Salix commutata | Bebb | Salicaceae | 8 |
| Salix discolor | Muhl. | Salicaceae | 8 |
| Salix drummondiana | Barratt | Salicaceae | 8 |
| Salix exigua | Nutt. | Salicaceae | 8 |
| Salix glauca | L. | Salicaceae | 8 |
| Salix interior | Rowlee | Salicaceae | 8 |
| Salix lasiandra | Benth. | Salicaceae | 8 |
| Salix melanopsis | Nutt. | Salicaceae | 8 |
| Salix myrtillifolia | Andersson | Salicaceae | 8 |
| Salix nivalis | Hook. | Salicaceae | 8 |
| Salix pedicellaris | Pursh | Salicaceae | 8 |
| Salix petiolaris | Sm. | Salicaceae | 8 |
| Salix petrophila | Rydb. | Salicaceae | 8 |
| Salix planifolia | Pursh | Salicaceae | 8 |
| Salix pseudomonticola | C.R.Ball | Salicaceae | 8 |
| Salix pyrifolia | Andersson | Salicaceae | 8 |
| Salix reticulata | L. | Salicaceae | 8 |
| Salix scouleriana | Barratt | Salicaceae | 8 |
| Salix serissima | (L.H.Bailey ex Arthur) Fernald | Salicaceae | 8 |
| Salix sitchensis | Sanson ex Bong. | Salicaceae | 8 |
| Salix vestita | Pursh | Salicaceae | 8 |
| Sambucus racemosa | L. | Viburnaceae | 8 |
| Sanicula marilandica | L. | Apiaceae | 8 |
| Sarcobatus vermiculatus | (Hook.) Torr. | Sarcobataceae | 8 |
| Sarracenia purpurea | L. | Sarraceniaceae | 8 |
| Saussurea americana | Eaton | Asteraceae | 8 |
| Saussurea nuda | Ledeb. | Asteraceae | 8 |
| Saxifraga adscendens | L. | Saxifragaceae | 8 |
| Saxifraga aizoides | L. | Saxifragaceae | 8 |
| Saxifraga bronchialis | L. | Saxifragaceae | 8 |
| Saxifraga cernua | L. | Saxifragaceae | 8 |
| Saxifraga cespitosa | L. | Saxifragaceae | 8 |
| Saxifraga flagellaris | Willd. ex Sternb. | Saxifragaceae | 8 |
| Saxifraga hyperborea | R.Br. | Saxifragaceae | 8 |
| Saxifraga oppositifolia | L. | Saxifragaceae | 8 |
| Saxifraga tricuspidata | Rottb. | Saxifragaceae | 8 |
| Sceptridium multifidum | (S.G.Gmel.) M.Nishida | Ophioglossaceae | 8 |
| Scheuchzeria palustris | L. | Scheuchzeriaceae | 8 |
| Schizachne purpurascens | (Torr.) Swallen | Poaceae | 8 |
| Schizachyrium scoparium | (Michx.) Nash | Poaceae | 8 |
| Schoenoplectus acutus | (Muhl. ex Bigelow) Á.Löve & D.Löve | Cyperaceae | 8 |
| Schoenoplectus heterochaetus | (Chase) Soják | Cyperaceae | 8 |
| Schoenoplectus pungens | (Vahl) Palla | Cyperaceae | 8 |
| Schoenoplectus tabernaemontani | (C.C.Gmel.) Palla | Cyperaceae | 8 |
| Scirpus atrocinctus | Fernald | Cyperaceae | 8 |
| Scirpus microcarpus | J.Presl & C.Presl | Cyperaceae | 8 |
| Scrophularia lanceolata | Pursh | Scrophulariaceae | 8 |
| Scutellaria galericulata | L. | Lamiaceae | 8 |
| Sedum divergens | S.Watson | Crassulaceae | 8 |
| Sedum lanceolatum | Torr. | Crassulaceae | 8 |
| Sedum stenopetalum | Pursh | Crassulaceae | 8 |
| Selaginella longipila | Hieron. | Selaginellaceae | 8 |
| Selaginella rupestris | (L.) Spring | Selaginellaceae | 8 |
| Selaginella scopulorum | Maxon | Selaginellaceae | 8 |
| Selaginella spinulosa | A.Braun ex Döll | Selaginellaceae | 8 |
| Selaginella standleyi | Maxon | Selaginellaceae | 8 |
| Selaginella wallacei | Hieron. | Selaginellaceae | 8 |
| Senecio eremophilus | Richardson | Asteraceae | 8 |
| Senecio fremontii | Torr. & A.Gray | Asteraceae | 8 |
| Senecio hydrophiloides | Rydb. | Asteraceae | 8 |
| Senecio integerrimus | Nutt. | Asteraceae | 8 |
| Senecio lugens | Richardson | Asteraceae | 8 |
| Senecio triangularis | Hook. | Asteraceae | 8 |
| Shepherdia argentea | (Pursh) Nutt. | Elaeagnaceae | 8 |
| Shepherdia canadensis | (L.) Nutt. | Elaeagnaceae | 8 |
| Sibbaldia procumbens | L. | Rosaceae | 8 |
| Sibbaldia tridentata | (Aiton) Paule & Soják | Rosaceae | 8 |
| Silene acaulis | (L.) Jacq. | Caryophyllaceae | 8 |
| Silene antirrhina | L. | Caryophyllaceae | 8 |
| Silene drummondii | Hook. | Caryophyllaceae | 8 |
| Silene menziesii | Hook. | Caryophyllaceae | 8 |
| Silene parryi | (S.Watson) C.L.Hitchc. & Maguire | Caryophyllaceae | 8 |
| Silene scouleri | Hook. | Caryophyllaceae | 8 |
| Silene uralensis | (Rupr.) Bocquet | Caryophyllaceae | 8 |
| Sisyrinchium montanum | Greene | Iridaceae | 8 |
| Sium suave | Walter | Apiaceae | 8 |
| Smelowskia americana | Rydb. | Brassicaceae | 8 |
| Solanum emulans | Raf. | Solanaceae | 8 |
| Solanum triflorum | Nutt. | Solanaceae | 8 |
| Solidago altissima | L. | Asteraceae | 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 multiradiata | Aiton | Asteraceae | 8 |
| Solidago rigida | L. | Asteraceae | 8 |
| Solidago simplex | Kunth | Asteraceae | 8 |
| Sorbus scopulina | Greene | Rosaceae | 8 |
| Sorbus sitchensis | M.Roem. | Rosaceae | 8 |
| Sparganium angustifolium | Michx. | Typhaceae | 8 |
| Sparganium emersum | Rehmann | Typhaceae | 8 |
| Sparganium eurycarpum | Engelm. | Typhaceae | 8 |
| Sparganium fluctuans | (Engelm.) B.L.Rob. | Typhaceae | 8 |
| Sparganium natans | L. | Typhaceae | 8 |
| Spergularia marina | (L.) Besser | Caryophyllaceae | 8 |
| Sphaeralcea coccinea | (Nutt.) Rydb. | Malvaceae | 8 |
| Sphenopholis intermedia | (Rydb.) Rydb. | Poaceae | 8 |
| Sphenopholis obtusata | (Michx.) Scribn. | Poaceae | 8 |
| Spinulum annotinum | (L.) A.Haines | Lycopodiaceae | 8 |
| Spiraea alba | Du Roi | Rosaceae | 8 |
| Spiraea lucida | Douglas ex Greene | Rosaceae | 8 |
| Spiraea splendens | Baumann ex K.Koch | Rosaceae | 8 |
| Spiranthes lacera | (Raf.) Raf. | Orchidaceae | 8 |
| Spiranthes romanzoffiana | Cham. | Orchidaceae | 8 |
| Spirodela polyrhiza | (L.) Schleid. | Araceae | 8 |
| Sporobolus cryptandrus | (Torr.) A.Gray | Poaceae | 8 |
| Sporobolus hookerianus | P.M.Peterson & Saarela | Poaceae | 8 |
| Sporobolus michauxianus | (Hitchc.) P.M.Peterson & Saarela | Poaceae | 8 |
| Sporobolus neglectus | Nash | Poaceae | 8 |
| Sporobolus rigidus | (Buckley) P.M.Peterson | Poaceae | 8 |
| Stachys pilosa | Nutt. | Lamiaceae | 8 |
| Stellaria borealis | Bigelow | Caryophyllaceae | 8 |
| Stellaria crassifolia | Ehrh. | Caryophyllaceae | 8 |
| Stellaria crispa | Cham. & Schltdl. | Caryophyllaceae | 8 |
| Stellaria longifolia | Muhl. ex Willd. | Caryophyllaceae | 8 |
| Stellaria longipes | Goldie | Caryophyllaceae | 8 |
| Stephanomeria runcinata | Nutt. | Asteraceae | 8 |
| Streptopus amplexifolius | (L.) DC. | Liliaceae | 8 |
| Streptopus lanceolatus | (Aiton) Reveal | Liliaceae | 8 |
| Stuckenia filiformis | (Pers.) Börner | Potamogetonaceae | 8 |
| Stuckenia pectinata | (L.) Börner | Potamogetonaceae | 8 |
| Suaeda calceoliformis | (Hook.) Moq. | Chenopodiaceae | 8 |
| Suaeda nigra | (Raf.) J.F.Macbr. | Chenopodiaceae | 8 |
| Suksdorfia ranunculifolia | (Hook.) Engl. | Saxifragaceae | 8 |
| Suksdorfia violacea | A.Gray | Saxifragaceae | 8 |
| Symphoricarpos albus | (L.) S.F.Blake | Caprifoliaceae | 8 |
| Symphoricarpos occidentalis | (R.Br.) Hook. | Caprifoliaceae | 8 |
| Symphyotrichum ascendens | (Lindl.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum boreale | (Torr. & A.Gray) Á.Löve & D.Löve | Asteraceae | 8 |
| Symphyotrichum campestre | (Nutt.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum ciliatum | (Ledeb.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum eatonii | (A.Gray) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum ericoides | (L.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum falcatum | (Lindl.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum firmum | (Nees) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum foliaceum | (Lindl. ex DC.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum laeve | (L.) Á.Löve & D.Löve | Asteraceae | 8 |
| Symphyotrichum lanceolatum | (Willd.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum subspicatum | (Nees) G.L.Nesom | Asteraceae | 8 |
| Tanacetum bipinnatum | Sch.Bip. | Asteraceae | 8 |
| Taxus brevifolia | Nutt. | Taxaceae | 8 |
| Telesonix heucheriformis | Rydb. | Saxifragaceae | 8 |
| Tephroseris palustris | Fourr. | Asteraceae | 8 |
| Tetraneuris acaulis | Greene | Asteraceae | 8 |
| Thacla natans | (Pall.) Deyl & Soják | Ranunculaceae | 8 |
| Thalictrum dasycarpum | Fisch., C.A.Mey. & Avé-Lall. | Ranunculaceae | 8 |
| Thalictrum occidentale | A.Gray | Ranunculaceae | 8 |
| Thalictrum sparsiflorum | Turcz. ex Fisch. & C.A.Mey. | Ranunculaceae | 8 |
| Thalictrum venulosum | Trel. | Ranunculaceae | 8 |
| Thelesperma subnudum | A.Gray | Asteraceae | 8 |
| Thermopsis rhombifolia | (Pursh) Richardson | Fabaceae | 8 |
| Thuja plicata | Donn ex D.Don | Cupressaceae | 8 |
| Tiarella trifoliata | L. | Saxifragaceae | 8 |
| Tofieldia pusilla | (Michx.) Pers. | Tofieldiaceae | 8 |
| Tomostima reptans | (Lam.) Al-Shehbaz, M.Koch & Jordon-Thaden | Brassicaceae | 8 |
| Tonestus lyallii | A.Nelson | Asteraceae | 8 |
| Townsendia condensata | Parry | Asteraceae | 8 |
| Townsendia exscapa | (Richardson) Porter | Asteraceae | 8 |
| Townsendia hookeri | Beaman | Asteraceae | 8 |
| Townsendia parryi | Eaton | Asteraceae | 8 |
| Toxicodendron radicans | (L.) Kuntze | Anacardiaceae | 8 |
| Toxicoscordion venenosum | (S.Watson) Rydb. | Melanthiaceae | 8 |
| Tradescantia occidentalis | (Britton) Smyth | Commelinaceae | 8 |
| Triantha glutinosa | (Michx.) Baker | Tofieldiaceae | 8 |
| Triantha occidentalis | (S.Watson) R.R.Gates | Tofieldiaceae | 8 |
| Trichogalium boreale | (L.) Fourr. | Rubiaceae | 8 |
| Trichophorum alpinum | (L.) Pers. | Cyperaceae | 8 |
| Trichophorum cespitosum | (L.) Hartm. | Cyperaceae | 8 |
| Triglochin maritima | L. | Juncaginaceae | 8 |
| Triglochin palustris | L. | Juncaginaceae | 8 |
| Triglochin scilloides | (Poir.) Mering & Kadereit | Juncaginaceae | 8 |
| Trollius albiflorus | (A.Gray) Rydb. | Ranunculaceae | 8 |
| Tsuga heterophylla | (Raf.) Sarg. | Pinaceae | 8 |
| Turritis glabra | L. | Brassicaceae | 8 |
| Typha latifolia | L. | Typhaceae | 8 |
| Urtica gracilis | Aiton | Urticaceae | 8 |
| Utricularia cornuta | Michx. | Lentibulariaceae | 8 |
| Utricularia intermedia | Hayne | Lentibulariaceae | 8 |
| Utricularia macrorhiza | Leconte | Lentibulariaceae | 8 |
| Utricularia minor | L. | Lentibulariaceae | 8 |
| Vaccinium cespitosum | Michx. | Ericaceae | 8 |
| Vaccinium microcarpum | (Turcz. ex Rupr.) Schmalh. | Ericaceae | 8 |
| Vaccinium myrtilloides | Michx. | Ericaceae | 8 |
| Vaccinium myrtillus | L. | Ericaceae | 8 |
| Vaccinium ovalifolium | Sm. | Ericaceae | 8 |
| Vaccinium oxycoccos | L. | Ericaceae | 8 |
| Vaccinium scoparium | Leiberg ex Coville | Ericaceae | 8 |
| Vaccinium uliginosum | L. | Ericaceae | 8 |
| Vaccinium vitis-idaea | L. | Ericaceae | 8 |
| Vahlodea atropurpurea | (Wahlenb.) Fr. | Poaceae | 8 |
| Valeriana dioica | L. | Caprifoliaceae | 8 |
| Valeriana sitchensis | Bong. | Caprifoliaceae | 8 |
| Veratrum viride | Aiton | Melanthiaceae | 8 |
| Verbena bracteata | Cav. ex Lag. & Rodr. | 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 |
| Veronica wyomingensis | (A.Nelson) M.M.Mart.Ort. & Albach | Plantaginaceae | 8 |
| Viburnum edule | (Michx.) Raf. | Viburnaceae | 8 |
| Viburnum opulus | L. | Viburnaceae | 8 |
| Vicia americana | Muhl. ex Willd. | Fabaceae | 8 |
| Viola adunca | Sm. | Violaceae | 8 |
| Viola canadensis | L. | Violaceae | 8 |
| Viola glabella | Nutt. | Violaceae | 8 |
| Viola macloskeyi | F.E.Lloyd | Violaceae | 8 |
| Viola nephrophylla | Greene | Violaceae | 8 |
| Viola nuttallii | Pursh | Violaceae | 8 |
| Viola orbiculata | (A.Gray) Geyer ex B.D.Jacks. | Violaceae | 8 |
| Viola palustris | L. | Violaceae | 8 |
| Viola pedatifida | G.Don | Violaceae | 8 |
| Viola praemorsa | Douglas | Violaceae | 8 |
| Viola renifolia | A.Gray | Violaceae | 8 |
| Viola selkirkii | Pursh ex Goldie | Violaceae | 8 |
| Wolffia borealis | (Engelm.) Landolt | Araceae | 8 |
| Wolffia columbiana | H.Karst. | Araceae | 8 |
| Woodsia glabella | R.Br. | Woodsiaceae | 8 |
| Woodsia ilvensis | (L.) R.Br. | Woodsiaceae | 8 |
| Woodsia oregana | D.C.Eaton | Woodsiaceae | 8 |
| Woodsia scopulina | D.C.Eaton | Woodsiaceae | 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 |
| Xerophyllum tenax | (Pursh) Nutt. | Melanthiaceae | 8 |
| Yucca glauca | Nutt. | Asparagaceae | 8 |
| Zannichellia palustris | L. | Potamogetonaceae | 8 |
| Zizania aquatica | L. | Poaceae | 8 |
| Zizia aptera | (A.Gray) Fernald | Apiaceae | 8 |
| Botrychium pallidum | W.H.Wagner | Ophioglossaceae | 7 |
| Bromus marginatus | Nees ex Steud. | Poaceae | 7 |
| Carex backii | Boott | Cyperaceae | 7 |
| Carex simulata | Mack. | Cyperaceae | 7 |
| Corispermum americanum | (Nutt.) Nutt. | Chenopodiaceae | 7 |
| Crepis runcinata | (E.James) Torr. & A.Gray | Asteraceae | 7 |
| Festuca saximontana | Rydb. | Poaceae | 7 |
| Koenigia islandica | L. | Polygonaceae | 7 |
| Plantago eriopoda | Torr. | Plantaginaceae | 7 |
| Sabulina elegans | (Cham. & Schltdl.) Dillenb. & Kadereit | Caryophyllaceae | 7 |
| Scirpus pallidus | (Britton) Fernald | Cyperaceae | 7 |
| Bacopa rotundifolia | (Michx.) Wettst. | Plantaginaceae | 6 |
| Calystegia macounii | (Greene) Brummitt | Convolvulaceae | 6 |
| Carex cordillerana | Saarela & B.A.Ford | Cyperaceae | 6 |
| Danthonia parryi | Scribn. | Poaceae | 6 |
| Draba borealis | DC. | Brassicaceae | 6 |
| Juncus triglumis | L. | Juncaceae | 6 |
| Lupinus wyethii | S.Watson | Fabaceae | 6 |
| Luzula hitchcockii | Hämet-Ahti | Juncaceae | 6 |
| Melica spectabilis | Scribn. | Poaceae | 6 |
| Navarretia saximontana | S.C.Spencer | Polemoniaceae | 6 |
| Polygonum ramosissimum | Michx. | Polygonaceae | 6 |
| Scolochloa festucacea | (Willd.) Link | Poaceae | 6 |
| Trichophorum pumilum | (Vahl) Schinz & Thell. | Cyperaceae | 6 |
| Antennaria alpina | (L.) Gaertn. | Asteraceae | 5 |
| Atriplex truncata | (Torr. ex S.Watson) A.Gray | Chenopodiaceae | 5 |
| Braya glabella | Richardson | Brassicaceae | 5 |
| Cardamine umbellata | Greene | Brassicaceae | 5 |
| Carex loliacea | L. | Cyperaceae | 5 |
| Carex oederi | Retz. | Cyperaceae | 5 |
| Carex podocarpa | R.Br. | Cyperaceae | 5 |
| Chrysosplenium iowense | Rydb. | Saxifragaceae | 5 |
| Drymocallis pseudorupestris | (Rydb.) Rydb. | Rosaceae | 5 |
| Euphrasia hudsoniana | Fernald & Wiegand | Orobanchaceae | 5 |
| Gayophytum racemosum | Torr. & A.Gray | Onagraceae | 5 |
| Gentiana fremontii | Torr. | Gentianaceae | 5 |
| Juncus vaseyi | Engelm. | Juncaceae | 5 |
| Oreocarya nubigena | Greene | Boraginaceae | 5 |
| Oreomecon kluanensis | (D.Löve) Galasso, Banfi & Bartolucci | Papaveraceae | 5 |
| Polygonum polygaloides | Meisn. | Polygonaceae | 5 |
| Sparganium hyperboreum | Laest. ex Beurl. | Typhaceae | 5 |
| Agrostis mertensii | Trin. | Poaceae | 4 |
| Carex torreyi | Tuck. | Cyperaceae | 4 |
| Draba incerta | Payson | Brassicaceae | 4 |
| Draba nivalis | Lilj. | Brassicaceae | 4 |
| Erigeron grandiflorus | Hook. | Asteraceae | 4 |
| Erigeron pallens | Cronquist | Asteraceae | 4 |
| Glyceria pulchella | (Nash) K.Schum. | Poaceae | 4 |
| Hesperostellaria americana | (Porter ex B.L.Rob.) Gang Yao, B.Xue & Z.Q.Song | Caryophyllaceae | 4 |
| Lepidium ramosissimum | A.Nelson | Brassicaceae | 4 |
| Packera contermina | (Greenm.) J.F.Bain | Asteraceae | 4 |
| Pedicularis parviflora | Sm. | Orobanchaceae | 4 |
| Physostegia ledinghamii | (B.Boivin) P.D.Cantino | Lamiaceae | 4 |
| Podagrostis humilis | (Vasey) Björkman | Poaceae | 4 |
| Salix arbusculoides | Andersson | Salicaceae | 4 |
| Salix calcicola | Fernald & Wiegand | Salicaceae | 4 |
| Solidago mollis | Bartl. | Asteraceae | 4 |
| Stellaria calycantha | (Ledeb.) Bong. | Caryophyllaceae | 4 |
| Trichophorum clintonii | (A.Gray) S.G.Sm. | Cyperaceae | 4 |
| Agrostis variabilis | Rydb. | Poaceae | 3 |
| Artemisia furcata | M.Bieb. | Asteraceae | 3 |
| Botrychium rubellum | Farrar & Stensvold | Ophioglossaceae | 3 |
| Carex enanderi | Hultén | Cyperaceae | 3 |
| Carex parryana | Dewey | Cyperaceae | 3 |
| Carex scopulorum | Holm | Cyperaceae | 3 |
| Chenopodium desiccatum | A.Nelson | Chenopodiaceae | 3 |
| Downingia laeta | (Greene) Greene | Campanulaceae | 3 |
| Draba crassifolia | Graham | Brassicaceae | 3 |
| Erysimum inconspicuum | (S.Watson) MacMill. | Brassicaceae | 3 |
| Festuca minutiflora | Rydb. | Poaceae | 3 |
| Festuca richardsonii | Hook. | Poaceae | 3 |
| Gentianella amarella | (L.) Börner | Gentianaceae | 3 |
| Packera subnuda | (DC.) Trock & T.M.Barkley | Asteraceae | 3 |
| Poa alpigena | Lindm. | Poaceae | 3 |
| Potentilla jepsonii | Ertter | Rosaceae | 3 |
| Pteridium latiusculum | Hieron. | Dennstaedtiaceae | 3 |
| Pyrrocoma lanceolata | (Hook.) Greene | Asteraceae | 3 |
| Pyrrocoma uniflora | (Hook.) Greene | Asteraceae | 3 |
| Ribes watsonianum | Koehne | Grossulariaceae | 3 |
| Salix prolixa | Andersson | Salicaceae | 3 |
| Salix tyrrellii | Raup | Salicaceae | 3 |
| Sparganium glomeratum | (Laest. ex Beurl.) Beurl. | Typhaceae | 3 |
| Streptopus streptopoides | (Ledeb.) Frye & Rigg | Liliaceae | 3 |
| Suckleya suckleyana | (Torr.) Rydb. | Chenopodiaceae | 3 |