| Abies balsamea | (L.) Mill. | Pinaceae | 8 |
| Acalypha rhomboidea | Raf. | Euphorbiaceae | 8 |
| Acer negundo | L. | Sapindaceae | 8 |
| Acer pensylvanicum | L. | Sapindaceae | 8 |
| Acer rubrum | L. | Sapindaceae | 8 |
| Acer saccharinum | L. | Sapindaceae | 8 |
| Acer saccharum | Marshall | Sapindaceae | 8 |
| Acer spicatum | Lam. | Sapindaceae | 8 |
| Acmispon americanus | (Nutt.) Rydb. | Fabaceae | 8 |
| Aconitum columbianum | Nutt. | Ranunculaceae | 8 |
| Acorus calamus | L. | Acoraceae | 8 |
| Actaea pachypoda | Elliott | Ranunculaceae | 8 |
| Actaea rubra | (Aiton) Willd. | Ranunculaceae | 8 |
| Adiantum pedatum | L. | Pteridaceae | 8 |
| Adlumia fungosa | (Aiton) Greene ex Britton, Sterns & Poggenb. | Papaveraceae | 8 |
| Adoxa moschatellina | L. | Viburnaceae | 8 |
| Agalinis aspera | (Douglas ex Benth.) Britton | Orobanchaceae | 8 |
| Agalinis auriculata | (Michx.) S.F.Blake | Orobanchaceae | 8 |
| Agalinis gattingeri | (Small) Small ex Britton & A.Br. | Orobanchaceae | 8 |
| Agalinis purpurea | (L.) Pennell | Orobanchaceae | 8 |
| Agalinis tenuifolia | (Vahl) Raf. | Orobanchaceae | 8 |
| Agastache foeniculum | (Pursh) Kuntze | Lamiaceae | 8 |
| Agastache nepetoides | (L.) Kuntze | Lamiaceae | 8 |
| Agastache scrophulariifolia | (Willd.) Kuntze | Lamiaceae | 8 |
| Ageratina altissima | (L.) R.M.King & H.Rob. | Asteraceae | 8 |
| Agrimonia gryposepala | Wallr. | Rosaceae | 8 |
| Agrimonia parviflora | Aiton | Rosaceae | 8 |
| Agrimonia pubescens | Wallr. | Rosaceae | 8 |
| Agrimonia rostellata | Wallr. | Rosaceae | 8 |
| Agrimonia striata | Michx. | Rosaceae | 8 |
| Agrostis hyemalis | (Walter) Britton, Sterns & Poggenb. | Poaceae | 8 |
| Agrostis perennans | (Walter) Tuck. | Poaceae | 8 |
| Agrostis scabra | Willd. | Poaceae | 8 |
| Aletris farinosa | L. | Nartheciaceae | 8 |
| Alisma gramineum | Lej. | Alismataceae | 8 |
| Alisma subcordatum | Raf. | Alismataceae | 8 |
| Alisma triviale | Pursh | Alismataceae | 8 |
| Allium canadense | L. | Amaryllidaceae | 8 |
| Allium cernuum | Roth | Amaryllidaceae | 8 |
| Allium schoenoprasum | L. | Amaryllidaceae | 8 |
| Allium stellatum | Nutt. ex Ker Gawl. | Amaryllidaceae | 8 |
| Allium tricoccum | Aiton | 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 |
| Amaranthus blitoides | S.Watson | Amaranthaceae | 8 |
| Amaranthus hypochondriacus | L. | Amaranthaceae | 8 |
| Amaranthus tuberculatus | (Moq.) J.D.Sauer | Amaranthaceae | 8 |
| Ambrosia artemisiifolia | L. | Asteraceae | 8 |
| Ambrosia psilostachya | DC. | Asteraceae | 8 |
| Ambrosia trifida | L. | Asteraceae | 8 |
| Amelanchier arborea | (F.Michx.) Fernald | Rosaceae | 8 |
| Amelanchier bartramiana | (Tausch) M.Roem. | Rosaceae | 8 |
| Amelanchier humilis | Wiegand | Rosaceae | 8 |
| Amelanchier laevis | Wiegand | Rosaceae | 8 |
| Amelanchier sanguinea | (Pursh) DC. | Rosaceae | 8 |
| Amelanchier stolonifera | Wiegand | Rosaceae | 8 |
| Ammannia robusta | Heer & Regel | Lythraceae | 8 |
| Amorpha canescens | Pursh | Fabaceae | 8 |
| Amorpha fruticosa | L. | Fabaceae | 8 |
| Amphicarpaea bracteata | (L.) Fernald | Fabaceae | 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 occidentalis | Pursh | Primulaceae | 8 |
| Anemonastrum canadense | (L.) Mosyakin | Ranunculaceae | 8 |
| Anemone caroliniana | Walter | Ranunculaceae | 8 |
| Anemone cylindrica | A.Gray | Ranunculaceae | 8 |
| Anemone multifida | Poir. | Ranunculaceae | 8 |
| Anemone quinquefolia | L. | Ranunculaceae | 8 |
| Anemone virginiana | L. | Ranunculaceae | 8 |
| Anemonella thalictroides | Spach | Ranunculaceae | 8 |
| Angelica atropurpurea | L. | Apiaceae | 8 |
| Antennaria howellii | Greene | Asteraceae | 8 |
| Antennaria neglecta | Greene | Asteraceae | 8 |
| Antennaria parlinii | Fernald | Asteraceae | 8 |
| Antennaria plantaginifolia | (L.) Richardson | Asteraceae | 8 |
| Anthoxanthum nitens | (Weber) Y.Schouten & Veldkamp | Poaceae | 8 |
| Anticlea elegans | (Pursh) Rydb. | Melanthiaceae | 8 |
| Apios americana | Medik. | Fabaceae | 8 |
| Aplectrum hyemale | (Muhl. ex Willd.) Torr. | Orchidaceae | 8 |
| Apocynum androsaemifolium | L. | Apocynaceae | 8 |
| Apocynum cannabinum | L. | Apocynaceae | 8 |
| Aquilegia canadensis | L. | Ranunculaceae | 8 |
| Arabidopsis lyrata | (L.) O'Kane & Al-Shehbaz | Brassicaceae | 8 |
| Aralia hispida | Vent. | Araliaceae | 8 |
| Aralia nudicaulis | L. | Araliaceae | 8 |
| Aralia racemosa | L. | Araliaceae | 8 |
| Arctostaphylos uva-ursi | (L.) Spreng. | Ericaceae | 8 |
| Arethusa bulbosa | L. | Orchidaceae | 8 |
| Argentina anserina | (L.) Rydb. | Rosaceae | 8 |
| Arisaema dracontium | (L.) Schott | Araceae | 8 |
| Arisaema pusillum | (Peck) Nash | Araceae | 8 |
| Arisaema triphyllum | (L.) Schott | Araceae | 8 |
| Aristida desmantha | Trin. & Rupr. | Poaceae | 8 |
| Aristida longespica | Poir. | Poaceae | 8 |
| Aristida oligantha | Michx. | Poaceae | 8 |
| Aristida purpurascens | Poir. | Poaceae | 8 |
| Aristida tuberculosa | Nutt. | Poaceae | 8 |
| Arnoglossum atriplicifolium | (L.) H.Rob. | Asteraceae | 8 |
| Arnoglossum plantagineum | Raf. | Asteraceae | 8 |
| Arnoglossum reniforme | (Hook.) H.Rob. | Asteraceae | 8 |
| Aronia melanocarpa | (Michx.) Elliott | Rosaceae | 8 |
| Artemisia campestris | L. | Asteraceae | 8 |
| Artemisia dracunculus | L. | Asteraceae | 8 |
| Artemisia frigida | Willd. | Asteraceae | 8 |
| Artemisia ludoviciana | Nutt. | Asteraceae | 8 |
| Artemisia serrata | Nutt. | Asteraceae | 8 |
| Artemisia stelleriana | Besser | Asteraceae | 8 |
| Asarum canadense | L. | Aristolochiaceae | 8 |
| Asclepias amplexicaulis | Sm. | Apocynaceae | 8 |
| Asclepias exaltata | L. | Apocynaceae | 8 |
| Asclepias hirtella | (Pennell) Woodson | Apocynaceae | 8 |
| Asclepias incarnata | L. | Apocynaceae | 8 |
| Asclepias meadii | Torr. ex A.Gray | Apocynaceae | 8 |
| Asclepias ovalifolia | Decne. | Apocynaceae | 8 |
| Asclepias purpurascens | L. | Apocynaceae | 8 |
| Asclepias sullivantii | Engelm. ex A.Gray | Apocynaceae | 8 |
| Asclepias syriaca | L. | Apocynaceae | 8 |
| Asclepias tuberosa | L. | Apocynaceae | 8 |
| Asclepias verticillata | L. | Apocynaceae | 8 |
| Asclepias viridiflora | Raf. | Apocynaceae | 8 |
| Asimina triloba | (L.) Dunal | Annonaceae | 8 |
| Asplenium pinnatifidum | Nutt. | Aspleniaceae | 8 |
| Asplenium platyneuron | (L.) Britton, Sterns & Poggenb. | Aspleniaceae | 8 |
| Asplenium rhizophyllum | L. | Aspleniaceae | 8 |
| Asplenium trichomanes | L. | Aspleniaceae | 8 |
| Asplenium viride | Huds. | Aspleniaceae | 8 |
| Astragalus alpinus | L. | Fabaceae | 8 |
| Astragalus canadensis | L. | Fabaceae | 8 |
| Astragalus crassicarpus | Nutt. | Fabaceae | 8 |
| Astragalus neglectus | (Torr. & A.Gray) E.Sheld. | Fabaceae | 8 |
| Athyrium angustum | (Willd.) C.Presl | Athyriaceae | 8 |
| Atriplex patula | L. | Chenopodiaceae | 8 |
| Aureolaria flava | (L.) Farw. | Orobanchaceae | 8 |
| Aureolaria grandiflora | (Benth.) Pennell | Orobanchaceae | 8 |
| Aureolaria pedicularia | (L.) Raf. ex Farw. | Orobanchaceae | 8 |
| Avenella flexuosa | (L.) Drejer | Poaceae | 8 |
| Azolla caroliniana | Willd. | Salviniaceae | 8 |
| Azolla filiculoides | Lam. | Salviniaceae | 8 |
| Baptisia lactea | (Raf.) Thieret | Fabaceae | 8 |
| Baptisia leucophaea | Nutt. | Fabaceae | 8 |
| Baptisia tinctoria | (L.) R.Br. | Fabaceae | 8 |
| Barbarea orthoceras | Ledeb. | Brassicaceae | 8 |
| Bartonia paniculata | (Michx.) Muhl. | Gentianaceae | 8 |
| Bartonia virginica | (L.) Britton, Sterns & Poggenb. | Gentianaceae | 8 |
| Beckmannia syzigachne | (Steud.) Fernald | Poaceae | 8 |
| Berula erecta | (Huds.) Coville | Apiaceae | 8 |
| Betula alleghaniensis | Britton | Betulaceae | 8 |
| Betula cordifolia | Regel | Betulaceae | 8 |
| Betula nigra | L. | Betulaceae | 8 |
| Betula papyrifera | Marshall | Betulaceae | 8 |
| Betula pumila | L. | Betulaceae | 8 |
| Bidens aristosa | Britton | Asteraceae | 8 |
| Bidens beckii | Torr. ex Spreng. | Asteraceae | 8 |
| Bidens cernua | L. | Asteraceae | 8 |
| Bidens connata | Muhl. ex Willd. | Asteraceae | 8 |
| Bidens discoidea | Britton | Asteraceae | 8 |
| Bidens frondosa | L. | Asteraceae | 8 |
| Bidens trichosperma | (Michx.) Britton | Asteraceae | 8 |
| Bidens tripartita | L. | Asteraceae | 8 |
| Bidens vulgata | Greene | Asteraceae | 8 |
| Blephilia ciliata | (L.) Raf. ex Benth. | Lamiaceae | 8 |
| Blephilia hirsuta | (Pursh) Benth. | Lamiaceae | 8 |
| Blitum capitatum | L. | Chenopodiaceae | 8 |
| Boechera angustifolia | (Nutt.) Dorn | Brassicaceae | 8 |
| Boechera grahamii | (Lehm.) Windham & Al-Shehbaz | Brassicaceae | 8 |
| Boehmeria cylindrica | (L.) Sw. | Urticaceae | 8 |
| Bolboschoenus fluviatilis | (Torr.) Soják | Cyperaceae | 8 |
| Boltonia asteroides | L'Hér. | Asteraceae | 8 |
| Borodinia canadensis | (L.) P.J.Alexander & Windham | Brassicaceae | 8 |
| Borodinia dentata | (Raf.) P.J.Alexander & Windham | Brassicaceae | 8 |
| Borodinia laevigata | (Muhl. ex Willd.) P.J.Alexander & Windham | Brassicaceae | 8 |
| Borodinia missouriensis | (Greene) P.J.Alexander & Windham | Brassicaceae | 8 |
| Botrychium angustisegmentum | (Pease & A.H.Moore) Fernald | Ophioglossaceae | 8 |
| Botrychium campestre | W.H.Wagner & Farrar | Ophioglossaceae | 8 |
| Botrychium matricariifolium | (Retz.) A.Braun ex W.D.J.Koch | Ophioglossaceae | 8 |
| Botrychium minganense | Vict. | 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 |
| Bouteloua hirsuta | Lag. | Poaceae | 8 |
| Brachyelytrum aristosum | (Michx.) Trel., Branner & Coville | Poaceae | 8 |
| Brachyelytrum erectum | (Schreb.) P.Beauv. | Poaceae | 8 |
| Brasenia schreberi | J.F.Gmel. | Cabombaceae | 8 |
| Bromus ciliatus | L. | Poaceae | 8 |
| Bromus kalmii | A.Gray | Poaceae | 8 |
| Bromus latiglumis | (Shear) Hitchc. | Poaceae | 8 |
| Bromus pubescens | Muhl. ex Willd. | Poaceae | 8 |
| Bulbostylis capillaris | (L.) Kunth ex C.B.Clarke | Cyperaceae | 8 |
| Cakile edentula | (Bigelow) Hook. | Brassicaceae | 8 |
| Calamagrostis breviligulata | (Fernald) Saarela | Poaceae | 8 |
| Calamagrostis canadensis | (Michx.) P.Beauv. | Poaceae | 8 |
| Calamagrostis inexpansa | A.Gray | Poaceae | 8 |
| Calamagrostis stricta | (Timm) Koeler | Poaceae | 8 |
| Calla palustris | L. | Araceae | 8 |
| Callirhoe alcaeoides | (Michx.) A.Gray | Malvaceae | 8 |
| Callirhoe triangulata | (Leavenw.) A.Gray | Malvaceae | 8 |
| Callitriche hermaphroditica | L. | Plantaginaceae | 8 |
| Callitriche heterophylla | Pursh | Plantaginaceae | 8 |
| Callitriche palustris | L. | Plantaginaceae | 8 |
| Callitriche terrestris | Raf. | Plantaginaceae | 8 |
| Calopogon oklahomensis | D.H.Goldman | Orchidaceae | 8 |
| Calopogon tuberosus | (L.) Britton, Sterns & Poggenb. | Orchidaceae | 8 |
| Caltha palustris | L. | Ranunculaceae | 8 |
| Calypso bulbosa | (L.) Oakes | Orchidaceae | 8 |
| Calystegia sepium | (L.) R.Br. | Convolvulaceae | 8 |
| Calystegia spithamaea | (L.) Pursh | Convolvulaceae | 8 |
| Camassia scilloides | (Raf.) Cory | Asparagaceae | 8 |
| Campanula americana | L. | Campanulaceae | 8 |
| Campanula intercedens | Witasek | Campanulaceae | 8 |
| Campsis radicans | (L.) Bureau | Bignoniaceae | 8 |
| Capnoides sempervirens | (L.) Borkh. | Papaveraceae | 8 |
| Cardamine bulbosa | (Schreb. ex Muhl.) Britton, Sterns & Poggenb. | Brassicaceae | 8 |
| Cardamine concatenata | (Michx.) O.Schwarz | Brassicaceae | 8 |
| Cardamine diphylla | (Michx.) Alph.Wood | Brassicaceae | 8 |
| Cardamine douglassii | Britton | Brassicaceae | 8 |
| Cardamine maxima | (Nutt.) Wood | Brassicaceae | 8 |
| Cardamine parviflora | L. | Brassicaceae | 8 |
| Cardamine pensylvanica | Muhl. ex Willd. | Brassicaceae | 8 |
| Cardamine pratensis | L. | Brassicaceae | 8 |
| Carex adusta | Boott | Cyperaceae | 8 |
| Carex aggregata | Mack. | Cyperaceae | 8 |
| Carex alascana | Boeckeler | Cyperaceae | 8 |
| Carex albicans | Willd. ex Spreng. | Cyperaceae | 8 |
| Carex albursina | E.Sheld. | Cyperaceae | 8 |
| Carex alopecoidea | Tuck. | Cyperaceae | 8 |
| Carex annectens | (E.P.Bicknell) E.P.Bicknell | Cyperaceae | 8 |
| Carex aquatilis | Wahlenb. | Cyperaceae | 8 |
| Carex arctata | Boott | Cyperaceae | 8 |
| Carex atherodes | Spreng. | Cyperaceae | 8 |
| Carex aurea | Nutt. | Cyperaceae | 8 |
| Carex bebbii | (L.H.Bailey) Olney ex Fernald | Cyperaceae | 8 |
| Carex bicknellii | Britton & A.Br. | Cyperaceae | 8 |
| Carex blanda | Dewey | Cyperaceae | 8 |
| Carex brevior | (Dewey) Mack. ex Lunell | Cyperaceae | 8 |
| Carex bromoides | Willd. | Cyperaceae | 8 |
| Carex brunnescens | (Pers.) Poir. | Cyperaceae | 8 |
| Carex buxbaumii | Wahlenb. | Cyperaceae | 8 |
| Carex canescens | L. | Cyperaceae | 8 |
| Carex capillaris | L. | Cyperaceae | 8 |
| Carex careyana | Torr. ex Dewey | Cyperaceae | 8 |
| Carex castanea | Wahlenb. | Cyperaceae | 8 |
| Carex cephaloidea | (Dewey) Dewey ex Boott | Cyperaceae | 8 |
| Carex cephalophora | Muhl. ex Willd. | Cyperaceae | 8 |
| Carex chordorrhiza | L.f. | Cyperaceae | 8 |
| Carex communis | L.H.Bailey | Cyperaceae | 8 |
| Carex comosa | Boott | Cyperaceae | 8 |
| Carex concinna | R.Br. | Cyperaceae | 8 |
| Carex crawei | Dewey ex Torr. | Cyperaceae | 8 |
| Carex crawfordii | Fernald | Cyperaceae | 8 |
| Carex crinita | Lam. | Cyperaceae | 8 |
| Carex cristatella | Britton | Cyperaceae | 8 |
| Carex crus-corvi | Shuttlew. ex Kunze | Cyperaceae | 8 |
| Carex cryptolepis | Mack. | Cyperaceae | 8 |
| Carex cumulata | (L.H.Bailey) Mack. | Cyperaceae | 8 |
| Carex davisii | Schwein. & Torr. | Cyperaceae | 8 |
| Carex debilis | Michx. | Cyperaceae | 8 |
| Carex deflexa | Hornem. | Cyperaceae | 8 |
| Carex deweyana | Schwein. | Cyperaceae | 8 |
| Carex diandra | Schrank | Cyperaceae | 8 |
| Carex digitalis | Willd. | Cyperaceae | 8 |
| Carex disperma | Dewey | Cyperaceae | 8 |
| Carex eburnea | Boott | Cyperaceae | 8 |
| Carex echinata | Murray | Cyperaceae | 8 |
| Carex emoryi | Dewey | Cyperaceae | 8 |
| Carex exilis | Dewey | Cyperaceae | 8 |
| Carex festucacea | Willd. | Cyperaceae | 8 |
| Carex flava | L. | Cyperaceae | 8 |
| Carex foenea | Willd. | Cyperaceae | 8 |
| Carex folliculata | L. | Cyperaceae | 8 |
| Carex formosa | Dewey | Cyperaceae | 8 |
| Carex garberi | Fernald | Cyperaceae | 8 |
| Carex gracillima | Schwein. | Cyperaceae | 8 |
| Carex granularis | Muhl. ex Willd. | Cyperaceae | 8 |
| Carex gravida | L.H.Bailey | Cyperaceae | 8 |
| Carex grayi | J.Carey | Cyperaceae | 8 |
| Carex grisea | Wahlenb. | Cyperaceae | 8 |
| Carex gynandra | Schwein. | Cyperaceae | 8 |
| Carex haydenii | Dewey | Cyperaceae | 8 |
| Carex hirsutella | Mack. | Cyperaceae | 8 |
| Carex hirtifolia | Mack. | Cyperaceae | 8 |
| Carex hitchcockiana | Dewey | Cyperaceae | 8 |
| Carex houghtoniana | Torr. ex Dewey | Cyperaceae | 8 |
| Carex hystericina | Muhl. ex Willd. | Cyperaceae | 8 |
| Carex inops | L.H.Bailey | Cyperaceae | 8 |
| Carex interior | L.H.Bailey | Cyperaceae | 8 |
| Carex intumescens | Rudge | Cyperaceae | 8 |
| Carex jamesii | Schwein. | Cyperaceae | 8 |
| Carex lacustris | Willd. | Cyperaceae | 8 |
| Carex laevivaginata | (Kük.) Mack. | Cyperaceae | 8 |
| Carex lasiocarpa | Ehrh. | Cyperaceae | 8 |
| Carex laxiculmis | Schwein. | Cyperaceae | 8 |
| Carex laxiflora | Lam. | Cyperaceae | 8 |
| Carex lenticularis | Michx. | Cyperaceae | 8 |
| Carex leptalea | Wahlenb. | Cyperaceae | 8 |
| Carex leptonervia | (Fernald) Fernald | Cyperaceae | 8 |
| Carex limosa | L. | Cyperaceae | 8 |
| Carex livida | (Wahlenb.) Willd. | Cyperaceae | 8 |
| Carex longii | Mack. | Cyperaceae | 8 |
| Carex lucorum | Willd. ex Link | Cyperaceae | 8 |
| Carex lupulina | Muhl. ex Willd. | Cyperaceae | 8 |
| Carex lurida | Wahlenb. | Cyperaceae | 8 |
| Carex magellanica | Lam. | Cyperaceae | 8 |
| Carex meadii | Dewey | Cyperaceae | 8 |
| Carex media | R.Br. | Cyperaceae | 8 |
| Carex michauxiana | Boeckeler | Cyperaceae | 8 |
| Carex molesta | Mack. | Cyperaceae | 8 |
| Carex muehlenbergii | Schkuhr ex Willd. | Cyperaceae | 8 |
| Carex muskingumensis | Schwein. | Cyperaceae | 8 |
| Carex normalis | Mack. | Cyperaceae | 8 |
| Carex novae-angliae | Schwein. | Cyperaceae | 8 |
| Carex oligosperma | Michx. | Cyperaceae | 8 |
| Carex pallescens | L. | 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 pensylvanica | Lam. | Cyperaceae | 8 |
| Carex plantaginea | Lam. | Cyperaceae | 8 |
| Carex platyphylla | J.Carey | Cyperaceae | 8 |
| Carex praegracilis | W.Boott | Cyperaceae | 8 |
| Carex prairea | Dewey ex Alph.Wood | Cyperaceae | 8 |
| Carex prasina | Wahlenb. | Cyperaceae | 8 |
| Carex projecta | Mack. | Cyperaceae | 8 |
| Carex pseudocyperus | L. | Cyperaceae | 8 |
| Carex radiata | (Wahlenb.) Small | Cyperaceae | 8 |
| Carex retrorsa | Schwein. | Cyperaceae | 8 |
| Carex richardsonii | R.Br. | Cyperaceae | 8 |
| Carex rosea | Willd. | Cyperaceae | 8 |
| Carex rostrata | Stokes | Cyperaceae | 8 |
| Carex sartwellii | Dewey | Cyperaceae | 8 |
| Carex scabrata | Schwein. | Cyperaceae | 8 |
| Carex scoparia | Schkuhr ex Willd. | Cyperaceae | 8 |
| Carex siccata | Dewey | Cyperaceae | 8 |
| Carex sparganioides | Muhl. ex Willd. | Cyperaceae | 8 |
| Carex sprengelii | Dewey ex Spreng. | Cyperaceae | 8 |
| Carex sterilis | Willd. | Cyperaceae | 8 |
| Carex stipata | Muhl. ex Willd. | Cyperaceae | 8 |
| Carex stricta | Lam. | Cyperaceae | 8 |
| Carex swanii | (Fernald) Mack. | Cyperaceae | 8 |
| Carex sychnocephala | J.Carey | Cyperaceae | 8 |
| Carex tenera | Dewey | Cyperaceae | 8 |
| Carex tenuiflora | Wahlenb. | Cyperaceae | 8 |
| Carex tetanica | Schkuhr | Cyperaceae | 8 |
| Carex tincta | (Fernald) Fernald | Cyperaceae | 8 |
| Carex tonsa | (Fernald) E.P.Bicknell | Cyperaceae | 8 |
| Carex tribuloides | Wahlenb. | Cyperaceae | 8 |
| Carex trichocarpa | Muhl. ex Willd. | Cyperaceae | 8 |
| Carex trisperma | Dewey | Cyperaceae | 8 |
| Carex tuckermanii | Dewey | Cyperaceae | 8 |
| Carex typhina | Michx. | 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 |
| Carex woodii | Dewey | Cyperaceae | 8 |
| Carpinus caroliniana | Walter | Betulaceae | 8 |
| Carya cordiformis | (Wangenh.) K.Koch | Juglandaceae | 8 |
| Carya glabra | (Mill.) Sweet | Juglandaceae | 8 |
| Carya ovata | (Mill.) K.Koch | Juglandaceae | 8 |
| Castanea dentata | Borkh. | Fagaceae | 8 |
| Castilleja coccinea | (L.) Spreng. | Orobanchaceae | 8 |
| Castilleja sessiliflora | Pursh | Orobanchaceae | 8 |
| Catabrosa aquatica | (L.) P.Beauv. | Poaceae | 8 |
| Caulophyllum thalictroides | (L.) Michx. | Berberidaceae | 8 |
| Ceanothus americanus | L. | Rhamnaceae | 8 |
| Ceanothus herbaceus | Raf. | Rhamnaceae | 8 |
| Celastrus scandens | L. | Celastraceae | 8 |
| Celtis occidentalis | L. | Cannabaceae | 8 |
| Cephalanthus occidentalis | L. | Rubiaceae | 8 |
| Cerastium brachypodum | (Engelm. ex A.Gray) B.L.Rob. | Caryophyllaceae | 8 |
| Cerastium nutans | Raf. | Caryophyllaceae | 8 |
| Ceratophyllum demersum | L. | Ceratophyllaceae | 8 |
| Ceratophyllum echinatum | A.Gray | Ceratophyllaceae | 8 |
| Cercis canadensis | L. | Fabaceae | 8 |
| Chaerophyllum procumbens | (L.) Crantz | Apiaceae | 8 |
| Chamaecrista fasciculata | (Michx.) Greene | Fabaceae | 8 |
| Chamaecrista nictitans | (L.) Moench | Fabaceae | 8 |
| Chamaedaphne calyculata | (L.) Moench | Ericaceae | 8 |
| Chasmanthium latifolium | (Michx.) H.O.Yates | Poaceae | 8 |
| Chelone glabra | L. | Plantaginaceae | 8 |
| Chenopodium berlandieri | Moq. | Chenopodiaceae | 8 |
| Chenopodium rubrum | L. | Chenopodiaceae | 8 |
| Chimaphila umbellata | (L.) W.P.C.Barton | Ericaceae | 8 |
| Chrysosplenium americanum | Schwein. ex Hook. | Saxifragaceae | 8 |
| Cicuta bulbifera | L. | Apiaceae | 8 |
| Cicuta maculata | L. | Apiaceae | 8 |
| Cinna arundinacea | L. | Poaceae | 8 |
| Cinna latifolia | (Trevir. ex Göpp.) Griseb. | Poaceae | 8 |
| Circaea alpina | L. | Onagraceae | 8 |
| Circaea canadensis | (L.) Hill | Onagraceae | 8 |
| Cirsium altissimum | (L.) Hill | Asteraceae | 8 |
| Cirsium discolor | (Muhl. ex Willd.) Spreng. | Asteraceae | 8 |
| Cirsium flodmanii | Arthur | Asteraceae | 8 |
| Cirsium muticum | Michx. | Asteraceae | 8 |
| Cirsium pitcheri | Torr. & A.Gray | Asteraceae | 8 |
| Cirsium pumilum | Spreng. | Asteraceae | 8 |
| Cirsium undulatum | (Nutt.) Spreng. | Asteraceae | 8 |
| Cladium mariscoides | (Muhl.) Torr. | Cyperaceae | 8 |
| Claytonia caroliniana | Michx. | Montiaceae | 8 |
| Claytonia virginica | L. | Montiaceae | 8 |
| Claytosmunda claytoniana | (L.) Metzgar & Rouhan | Osmundaceae | 8 |
| Clematis occidentalis | (Hornem.) DC. | Ranunculaceae | 8 |
| Clematis virginiana | L. | Ranunculaceae | 8 |
| Cleome dodecandra | L. | Cleomaceae | 8 |
| Cleome jamesii | (Torr. & A.Gray) Govaerts | Cleomaceae | 8 |
| Clinopodium arkansanum | (Nutt.) House | Lamiaceae | 8 |
| Clintonia borealis | (Aiton) Raf. | Liliaceae | 8 |
| Clitoria mariana | L. | Fabaceae | 8 |
| Coleataenia rigidula | (Bosc ex Nees) LeBlond | Poaceae | 8 |
| Collinsia verna | Nutt. | Plantaginaceae | 8 |
| Collomia linearis | Nutt. | Polemoniaceae | 8 |
| Comandra umbellata | (L.) Nutt. | Santalaceae | 8 |
| Comarum palustre | L. | Rosaceae | 8 |
| Commelina erecta | L. | Commelinaceae | 8 |
| Comptonia peregrina | (L.) Coult. | Myricaceae | 8 |
| Conioselinum chinense | (L.) Britton, Sterns & Poggenb. | Apiaceae | 8 |
| Conopholis americana | (L.) Wallr. | Orobanchaceae | 8 |
| Conyza ramosissima | Cronquist | Asteraceae | 8 |
| Coptis trifolia | (L.) Salisb. | Ranunculaceae | 8 |
| Corallorhiza maculata | Raf. | Orchidaceae | 8 |
| Corallorhiza odontorhiza | (Willd.) Nutt. | Orchidaceae | 8 |
| Corallorhiza striata | Lindl. | Orchidaceae | 8 |
| Corallorhiza trifida | Châtel. | Orchidaceae | 8 |
| Coreopsis grandiflora | Hogg ex Sweet | Asteraceae | 8 |
| Coreopsis lanceolata | L. | Asteraceae | 8 |
| Coreopsis tinctoria | Nutt. | Asteraceae | 8 |
| Coreopsis tripteris | L. | Asteraceae | 8 |
| Corispermum villosum | Rydb. | Chenopodiaceae | 8 |
| Cornus alternifolia | L.f. | Cornaceae | 8 |
| Cornus canadensis | L. | Cornaceae | 8 |
| Cornus drummondii | C.A.Mey. | Cornaceae | 8 |
| Cornus obliqua | Raf. | Cornaceae | 8 |
| Cornus racemosa | Lam. | Cornaceae | 8 |
| Cornus rugosa | Lam. | Cornaceae | 8 |
| Cornus sericea | L. | Cornaceae | 8 |
| Corydalis aurea | Willd. | Papaveraceae | 8 |
| Corydalis micrantha | (Engelm. ex A.Gray) A.Gray ex J.M.Coult. | Papaveraceae | 8 |
| Corylus americana | Walter | Betulaceae | 8 |
| Corylus cornuta | Marshall | Betulaceae | 8 |
| Coryphopteris simulata | (Davenp.) S.E.Fawc. | Thelypteridaceae | 8 |
| Crataegus calpodendron | (Ehrh.) Medik. | Rosaceae | 8 |
| Crataegus chrysocarpa | Ashe | Rosaceae | 8 |
| Crataegus coccinea | L. | Rosaceae | 8 |
| Crataegus coccinioides | Ashe | Rosaceae | 8 |
| Crataegus crus-galli | L. | Rosaceae | 8 |
| Crataegus douglasii | Lindl. | Rosaceae | 8 |
| Crataegus fluviatilis | Sarg. | Rosaceae | 8 |
| Crataegus holmesiana | Ashe | Rosaceae | 8 |
| Crataegus intricata | Lange | Rosaceae | 8 |
| Crataegus irrasa | Sarg. | Rosaceae | 8 |
| Crataegus lumaria | Ashe | Rosaceae | 8 |
| Crataegus macracantha | (Lindl.) Lodd. ex Loudon | Rosaceae | 8 |
| Crataegus macrosperma | Ashe | Rosaceae | 8 |
| Crataegus mollis | (Torr. & A.Gray) Scheele | Rosaceae | 8 |
| Crataegus pruinosa | (H.L.Wendl.) K.Koch | Rosaceae | 8 |
| Crataegus punctata | Jacq. | Rosaceae | 8 |
| Crataegus scabrida | Sarg. | Rosaceae | 8 |
| Crataegus schuettei | Ashe | Rosaceae | 8 |
| Crataegus submollis | Sarg. | Rosaceae | 8 |
| Crocanthemum bicknellii | (Fernald) Janch. | Cistaceae | 8 |
| Crocanthemum canadense | (L.) Britton | Cistaceae | 8 |
| Crotalaria sagittalis | L. | Fabaceae | 8 |
| Croton glandulosus | L. | Euphorbiaceae | 8 |
| Croton monanthogynus | Michx. | Euphorbiaceae | 8 |
| Croton texensis | (Klotzsch) Müll.Arg. | Euphorbiaceae | 8 |
| Cryptogramma stelleri | (S.G.Gmel.) Prantl | Pteridaceae | 8 |
| Cryptotaenia canadensis | (L.) DC. | Apiaceae | 8 |
| Cuscuta campestris | Yunck. | Convolvulaceae | 8 |
| Cuscuta cephalanthi | Engelm. | Convolvulaceae | 8 |
| Cuscuta coryli | Engelm. | Convolvulaceae | 8 |
| Cuscuta cuspidata | Engelm. | Convolvulaceae | 8 |
| Cuscuta glomerata | Choisy | Convolvulaceae | 8 |
| Cuscuta gronovii | Willd. | Convolvulaceae | 8 |
| Cuscuta indecora | Choisy | Convolvulaceae | 8 |
| Cuscuta pentagona | Engelm. | Convolvulaceae | 8 |
| Cyperus bipartitus | Torr. | Cyperaceae | 8 |
| Cyperus diandrus | Torr. | Cyperaceae | 8 |
| Cyperus echinatus | (L.) Alph.Wood | Cyperaceae | 8 |
| Cyperus esculentus | L. | Cyperaceae | 8 |
| Cyperus lupulinus | (Biehler) Marcks | Cyperaceae | 8 |
| Cyperus odoratus | L. | Cyperaceae | 8 |
| Cyperus schweinitzii | Torr. | Cyperaceae | 8 |
| Cyperus squarrosus | L. | Cyperaceae | 8 |
| Cyperus strigosus | L. | Cyperaceae | 8 |
| Cyperus subsquarrosus | (Muhl.) Bauters | Cyperaceae | 8 |
| Cypripedium acaule | Aiton | Orchidaceae | 8 |
| Cypripedium arietinum | R.Br. | Orchidaceae | 8 |
| Cypripedium candidum | Muhl. ex Willd. | Orchidaceae | 8 |
| Cypripedium parviflorum | Salisb. | Orchidaceae | 8 |
| Cypripedium reginae | Walter | Orchidaceae | 8 |
| Cystopteris bulbifera | (L.) Bernh. | Cystopteridaceae | 8 |
| Cystopteris fragilis | (L.) Bernh. | Cystopteridaceae | 8 |
| Cystopteris protrusa | (Weath.) Blasdell | Cystopteridaceae | 8 |
| Cystopteris tennesseensis | Shaver | Cystopteridaceae | 8 |
| Cystopteris tenuis | (Michx.) Desv. | Cystopteridaceae | 8 |
| Dactylorhiza viridis | (L.) R.M.Bateman, Pridgeon & M.W.Chase | Orchidaceae | 8 |
| Dalea candida | Willd. | Fabaceae | 8 |
| Dalea leporina | (Aiton) Bullock | Fabaceae | 8 |
| Dalea purpurea | Vent. | Fabaceae | 8 |
| Dalea villosa | (Nutt.) Spreng. | Fabaceae | 8 |
| Danthonia compressa | Austin | Poaceae | 8 |
| Danthonia spicata | (L.) Roem. & Schult. | Poaceae | 8 |
| Dasiphora fruticosa | (L.) Rydb. | Rosaceae | 8 |
| Dasistoma macrophylla | (Nutt.) Raf. | Orobanchaceae | 8 |
| Decodon verticillatus | (L.) Elliott | Lythraceae | 8 |
| Delphinium carolinianum | Walter | Ranunculaceae | 8 |
| Dendrolycopodium dendroideum | (Michx.) A.Haines | Lycopodiaceae | 8 |
| Dendrolycopodium hickeyi | (W.H.Wagner, Beitel & R.C.Moran) A.Haines | Lycopodiaceae | 8 |
| Dendrolycopodium obscurum | (L.) A.Haines | Lycopodiaceae | 8 |
| Deparia acrostichoides | (Sw.) M.Kato | Athyriaceae | 8 |
| Descurainia pinnata | (Walter) Britton | Brassicaceae | 8 |
| Desmanthus illinoensis | (Michx.) MacMill. ex B.L.Rob. & Fernald | Fabaceae | 8 |
| Desmodium canadense | (L.) DC. | Fabaceae | 8 |
| Desmodium canescens | (L.) DC. | Fabaceae | 8 |
| Desmodium cuspidatum | (Muhl. ex Willd.) DC. ex G.Don | Fabaceae | 8 |
| Desmodium illinoense | A.Gray | Fabaceae | 8 |
| Desmodium perplexum | B.G.Schub. | Fabaceae | 8 |
| Dianthera americana | L. | Acanthaceae | 8 |
| Diarrhena americana | P.Beauv. | Poaceae | 8 |
| Diarrhena obovata | (Gleason) Brandenburg | Poaceae | 8 |
| Dicentra canadensis | (Goldie) Walp. | Papaveraceae | 8 |
| Dicentra cucullaria | (L.) Bernh. | Papaveraceae | 8 |
| Dichanthelium clandestinum | (L.) Gould | Poaceae | 8 |
| Dichanthelium commonsianum | (Ashe) Freckmann | Poaceae | 8 |
| Dichanthelium depauperatum | (Muhl.) Gould | Poaceae | 8 |
| Dichanthelium dichotomum | (L.) Gould | Poaceae | 8 |
| Dichanthelium implicatum | (Scribn.) Kerguélen | Poaceae | 8 |
| Dichanthelium lanuginosum | (Elliott) Gould | Poaceae | 8 |
| Dichanthelium latifolium | (L.) Harvill | Poaceae | 8 |
| Dichanthelium leibergii | (Vasey) Freckmann | Poaceae | 8 |
| Dichanthelium lindheimeri | (Nash) Gould | Poaceae | 8 |
| Dichanthelium linearifolium | (Scribn.) Gould | Poaceae | 8 |
| Dichanthelium meridionale | (Ashe) Freckmann | Poaceae | 8 |
| Dichanthelium oligosanthes | (Schult.) Gould | Poaceae | 8 |
| Dichanthelium portoricense | (Desv.) B.F.Hansen & Wunderlin | Poaceae | 8 |
| Dichanthelium praecocius | (Hitchc. & Chase) Mohlenbr. | Poaceae | 8 |
| Dichanthelium xanthophysum | (A.Gray) Freckmann | Poaceae | 8 |
| Diervilla lonicera | Mill. | Caprifoliaceae | 8 |
| Digitaria cognata | (Schult.) Pilg. | Poaceae | 8 |
| Dioscorea villosa | L. | Dioscoreaceae | 8 |
| Diphasiastrum complanatum | (L.) Holub | Lycopodiaceae | 8 |
| Diphasiastrum digitatum | (Dill. ex A.Braun) Holub | Lycopodiaceae | 8 |
| Diphasiastrum tristachyum | (Pursh) Holub | Lycopodiaceae | 8 |
| Diplaziopsis pycnocarpa | (Spreng.) M.G.Price | Diplaziopsidaceae | 8 |
| Dirca palustris | L. | Thymelaeaceae | 8 |
| Distichlis spicata | (L.) Greene | Poaceae | 8 |
| Doellingeria umbellata | (Mill.) Nees | Asteraceae | 8 |
| Draba arabisans | Michx. | Brassicaceae | 8 |
| Draba cana | Rydb. | Brassicaceae | 8 |
| Draba glabella | Pursh | Brassicaceae | 8 |
| Draba nemorosa | L. | Brassicaceae | 8 |
| Dracocephalum parviflorum | Nutt. | Lamiaceae | 8 |
| Drosera anglica | Huds. | Droseraceae | 8 |
| Drosera intermedia | Hayne | Droseraceae | 8 |
| Drosera linearis | Goldie | Droseraceae | 8 |
| Drosera rotundifolia | L. | Droseraceae | 8 |
| Drymocallis arguta | (Pursh) 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 |
| Dryopteris goldieana | (Hook. ex Goldie) A.Gray | Dryopteridaceae | 8 |
| Dryopteris intermedia | A.Gray | Dryopteridaceae | 8 |
| Dryopteris marginalis | (L.) A.Gray | Dryopteridaceae | 8 |
| Dulichium arundinaceum | (L.) Britton | Cyperaceae | 8 |
| Dyssodia papposa | (Vent.) Hitchc. | Asteraceae | 8 |
| Echinacea pallida | (Nutt.) Nutt. | Asteraceae | 8 |
| Echinacea purpurea | (L.) Moench | Asteraceae | 8 |
| Echinochloa muricata | (P.Beauv.) Fernald | Poaceae | 8 |
| Echinochloa walteri | (Pursh) A.Heller | Poaceae | 8 |
| Echinocystis lobata | (Michx.) Torr. & A.Gray | Cucurbitaceae | 8 |
| Echinodorus berteroi | (Spreng.) Fassett | Alismataceae | 8 |
| Eclipta prostrata | (L.) L. | Asteraceae | 8 |
| Eleocharis acicularis | (L.) Roem. & Schult. | Cyperaceae | 8 |
| Eleocharis compressa | Sull. | Cyperaceae | 8 |
| Eleocharis elliptica | Kunth | Cyperaceae | 8 |
| Eleocharis engelmannii | Steud. | Cyperaceae | 8 |
| Eleocharis erythropoda | Steud. | Cyperaceae | 8 |
| Eleocharis macrostachya | Britton | Cyperaceae | 8 |
| Eleocharis nitida | Fernald | Cyperaceae | 8 |
| Eleocharis obtusa | (Willd.) Schult. | Cyperaceae | 8 |
| Eleocharis ovata | (Roth) Roem. & Schult. | Cyperaceae | 8 |
| Eleocharis palustris | (L.) Roem. & Schult. | Cyperaceae | 8 |
| Eleocharis parvula | (Roem. & Schult.) Link ex Bluff, Nees & Schauer | Cyperaceae | 8 |
| Eleocharis quadrangulata | (Michx.) Roem. & Schult. | Cyperaceae | 8 |
| Eleocharis quinqueflora | (Hartmann) O.Schwarz | Cyperaceae | 8 |
| Eleocharis robbinsii | Oakes | Cyperaceae | 8 |
| Eleocharis rostellata | (Torr.) Torr. | 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 curvatus | Piper | Poaceae | 8 |
| Elymus glaucus | Buckley | Poaceae | 8 |
| Elymus hystrix | L. | Poaceae | 8 |
| Elymus lanceolatus | (Scribn. & J.G.Sm.) Gould | Poaceae | 8 |
| Elymus macgregorii | R.E.Brooks & J.J.N.Campb. | Poaceae | 8 |
| Elymus riparius | Wiegand | Poaceae | 8 |
| Elymus smithii | (Rydb.) Gould | Poaceae | 8 |
| Elymus villosus | Muhl. ex Willd. | Poaceae | 8 |
| Elymus violaceus | (Hornem.) J.Feilberg | Poaceae | 8 |
| Elymus virginicus | L. | Poaceae | 8 |
| Enemion biternatum | Raf. | Ranunculaceae | 8 |
| Epifagus virginiana | (L.) Barton | Orobanchaceae | 8 |
| Epigaea repens | L. | Ericaceae | 8 |
| Epilobium angustifolium | L. | Onagraceae | 8 |
| Epilobium ciliatum | Raf. | Onagraceae | 8 |
| Epilobium coloratum | Muhl. ex Willd. | Onagraceae | 8 |
| Epilobium densum | Raf. | Onagraceae | 8 |
| Epilobium leptophyllum | Raf. | 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 |
| Eragrostis hypnoides | (Lam.) Britton, Sterns & Poggenb. | Poaceae | 8 |
| Eragrostis pectinacea | (Michx.) Nees | Poaceae | 8 |
| Eragrostis spectabilis | (Pursh) Steud. | Poaceae | 8 |
| Eragrostis trichodes | (Nutt.) Alph.Wood | Poaceae | 8 |
| Erechtites hieraciifolius | (L.) Raf. ex DC. | Asteraceae | 8 |
| Erigenia bulbosa | (Michx.) Nutt. | Apiaceae | 8 |
| Erigeron annuus | (L.) Desf. | Asteraceae | 8 |
| Erigeron canadensis | L. | Asteraceae | 8 |
| Erigeron glabellus | Nutt. | Asteraceae | 8 |
| Erigeron philadelphicus | L. | Asteraceae | 8 |
| Erigeron pulchellus | Michx. | Asteraceae | 8 |
| Erigeron strigosus | Muhl. ex Willd. | Asteraceae | 8 |
| Eriocaulon aquaticum | (Hill) Druce | Eriocaulaceae | 8 |
| Eriophorum angustifolium | Honck. | Cyperaceae | 8 |
| Eriophorum chamissonis | C.A.Mey. | Cyperaceae | 8 |
| Eriophorum gracile | Roth | Cyperaceae | 8 |
| Eriophorum tenellum | Nutt. | Cyperaceae | 8 |
| Eriophorum vaginatum | L. | Cyperaceae | 8 |
| Eriophorum virginicum | L. | Cyperaceae | 8 |
| Eriophorum viridicarinatum | (Engelm.) Fernald | Cyperaceae | 8 |
| Eryngium yuccifolium | Michx. | Apiaceae | 8 |
| Erythranthe geyeri | (Torr.) G.L.Nesom | Phrymaceae | 8 |
| Erythranthe moschata | (Douglas ex Lindl.) G.L.Nesom | Phrymaceae | 8 |
| Erythronium albidum | Nutt. | Liliaceae | 8 |
| Erythronium americanum | Ker Gawl. | Liliaceae | 8 |
| Euonymus atropurpureus | Jacq. | Celastraceae | 8 |
| Eupatorium altissimum | L. | Asteraceae | 8 |
| Eupatorium hyssopifolium | L. | Asteraceae | 8 |
| Eupatorium perfoliatum | L. | Asteraceae | 8 |
| Eupatorium serotinum | Michx. | Asteraceae | 8 |
| Eupatorium sessilifolium | L. | Asteraceae | 8 |
| Euphorbia commutata | Engelm. ex A.Gray | Euphorbiaceae | 8 |
| Euphorbia corollata | L. | Euphorbiaceae | 8 |
| Euphorbia dentata | Michx. | Euphorbiaceae | 8 |
| Euphorbia geyeri | Engelm. | Euphorbiaceae | 8 |
| Euphorbia glyptosperma | Engelm. | Euphorbiaceae | 8 |
| Euphorbia heterophylla | L. | Euphorbiaceae | 8 |
| Euphorbia hexagona | Nutt. ex Spreng. | Euphorbiaceae | 8 |
| Euphorbia maculata | L. | Euphorbiaceae | 8 |
| Euphorbia nutans | Lag. | Euphorbiaceae | 8 |
| Euphorbia polygonifolia | L. | Euphorbiaceae | 8 |
| Euphorbia serpillifolia | Pers. | Euphorbiaceae | 8 |
| Euphorbia spathulata | Lam. | Euphorbiaceae | 8 |
| Euphorbia vermiculata | Raf. | Euphorbiaceae | 8 |
| Eurybia furcata | (E.S.Burgess) G.L.Nesom | Asteraceae | 8 |
| Eurybia macrophylla | (L.) Cass. | Asteraceae | 8 |
| Eurybia schreberi | (Nees) Nees | Asteraceae | 8 |
| Euthamia graminifolia | (L.) Nutt. | Asteraceae | 8 |
| Euthamia gymnospermoides | Greene | Asteraceae | 8 |
| Eutrochium maculatum | (L.) E.E.Lamont | Asteraceae | 8 |
| Eutrochium purpureum | (L.) E.E.Lamont | Asteraceae | 8 |
| Fagus grandifolia | Ehrh. | Fagaceae | 8 |
| Fallopia scandens | (L.) Holub | Polygonaceae | 8 |
| Festuca occidentalis | Hook. | Poaceae | 8 |
| Festuca octoflora | Walter | Poaceae | 8 |
| Festuca rubra | L. | Poaceae | 8 |
| Festuca subverticillata | (Pers.) E.B.Alexeev | Poaceae | 8 |
| Filipendula rubra | (Hill) B.L.Rob. | Rosaceae | 8 |
| Fimbristylis autumnalis | (L.) Roem. & Schult. | Cyperaceae | 8 |
| Fimbristylis puberula | (Michx.) Vahl | Cyperaceae | 8 |
| Floerkea proserpinacoides | Willd. | Limnanthaceae | 8 |
| Fragaria vesca | L. | Rosaceae | 8 |
| Fragaria virginiana | Mill. | Rosaceae | 8 |
| Frasera caroliniensis | Walter | Gentianaceae | 8 |
| Fraxinus americana | L. | Oleaceae | 8 |
| Fraxinus nigra | Marshall | Oleaceae | 8 |
| Fraxinus pennsylvanica | Marshall | Oleaceae | 8 |
| Fraxinus quadrangulata | Michx. | Oleaceae | 8 |
| Froelichia floridana | (Nutt.) Moq. | Amaranthaceae | 8 |
| Froelichia gracilis | (Hook.) Moq. | Amaranthaceae | 8 |
| Galearis rotundifolia | (Banks ex Pursh) R.M.Bateman | Orchidaceae | 8 |
| Galearis spectabilis | (L.) Raf. | Orchidaceae | 8 |
| Galium asprellum | Michx. | Rubiaceae | 8 |
| Galium concinnum | Torr. & A.Gray | Rubiaceae | 8 |
| Galium obtusum | Bigelow | Rubiaceae | 8 |
| Galium trifidum | L. | Rubiaceae | 8 |
| Galium triflorum | Michx. | Rubiaceae | 8 |
| Gaultheria hispidula | (L.) Muhl. ex Bigelow | Ericaceae | 8 |
| Gaultheria procumbens | L. | Ericaceae | 8 |
| Gaylussacia baccata | (Wangenh.) K.Koch | Ericaceae | 8 |
| Gentiana alba | Muhl. ex J.McNab | Gentianaceae | 8 |
| Gentiana andrewsii | Griseb. | Gentianaceae | 8 |
| Gentiana linearis | Froel. | Gentianaceae | 8 |
| Gentiana puberulenta | J.S.Pringle | Gentianaceae | 8 |
| Gentiana rubricaulis | Schwein. | Gentianaceae | 8 |
| Gentianella quinquefolia | (L.) Small | Gentianaceae | 8 |
| Gentianopsis crinita | (Froel.) Ma | 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 maculatum | L. | Geraniaceae | 8 |
| Geranium robertianum | L. | Geraniaceae | 8 |
| Geum aleppicum | Jacq. | Rosaceae | 8 |
| Geum canadense | Jacq. | Rosaceae | 8 |
| Geum laciniatum | Murray | Rosaceae | 8 |
| Geum macrophyllum | Willd. | Rosaceae | 8 |
| Geum rivale | L. | Rosaceae | 8 |
| Geum triflorum | Pursh | Rosaceae | 8 |
| Geum vernum | (Raf.) Torr. & A.Gray | Rosaceae | 8 |
| Geum virginianum | L. | Rosaceae | 8 |
| Gleditsia triacanthos | L. | Fabaceae | 8 |
| Glyceria borealis | (Nash) Batch. | Poaceae | 8 |
| Glyceria canadensis | (Michx.) Trin. | Poaceae | 8 |
| Glyceria grandis | S.Watson | Poaceae | 8 |
| Glyceria septentrionalis | Hitchc. | Poaceae | 8 |
| Glyceria striata | (Lam.) Hitchc. | Poaceae | 8 |
| Glycyrrhiza lepidota | Pursh | Fabaceae | 8 |
| Gnaphalium uliginosum | L. | Asteraceae | 8 |
| Goodyera oblongifolia | Raf. | Orchidaceae | 8 |
| Goodyera pubescens | (Willd.) R.Br. | Orchidaceae | 8 |
| Goodyera repens | (L.) R.Br. | Orchidaceae | 8 |
| Goodyera tesselata | G.Lodd. | Orchidaceae | 8 |
| Gratiola lutea | Raf. | Plantaginaceae | 8 |
| Gratiola neglecta | Torr. | Plantaginaceae | 8 |
| Grindelia lanceolata | Nutt. | Asteraceae | 8 |
| Grindelia squarrosa | (Pursh) Dunal | Asteraceae | 8 |
| Gymnocarpium continentale | (Petrov.) Pojark. | Cystopteridaceae | 8 |
| Gymnocarpium dryopteris | (L.) Newman | Cystopteridaceae | 8 |
| Gymnocarpium robertianum | (Hoffm.) Newman | Cystopteridaceae | 8 |
| Gymnocladus dioicus | (L.) K.Koch | Fabaceae | 8 |
| Hackelia deflexa | (Wahlenb.) Opiz | Boraginaceae | 8 |
| Hackelia virginiana | (L.) I.M.Johnst. | Boraginaceae | 8 |
| Halenia deflexa | (Sm.) Griseb. | Gentianaceae | 8 |
| Halerpestes cymbalaria | Greene | Ranunculaceae | 8 |
| Hamamelis virginiana | L. | Hamamelidaceae | 8 |
| Hasteola suaveolens | (L.) Pojark. | Asteraceae | 8 |
| Hedeoma hispida | Pursh | Lamiaceae | 8 |
| Hedeoma pulegioides | (L.) Pers. | Lamiaceae | 8 |
| Helenium autumnale | L. | Asteraceae | 8 |
| Helenium flexuosum | Raf. | Asteraceae | 8 |
| Helianthus divaricatus | L. | Asteraceae | 8 |
| Helianthus giganteus | L. | Asteraceae | 8 |
| Helianthus grosseserratus | M.Martens | Asteraceae | 8 |
| Helianthus hirsutus | Raf. | Asteraceae | 8 |
| Helianthus maximiliani | Schrad. | Asteraceae | 8 |
| Helianthus mollis | Lam. | Asteraceae | 8 |
| Helianthus occidentalis | Riddell | Asteraceae | 8 |
| Helianthus pauciflorus | Nutt. | Asteraceae | 8 |
| Helianthus petiolaris | Nutt. | Asteraceae | 8 |
| Helianthus strumosus | L. | Asteraceae | 8 |
| Helianthus tuberosus | L. | Asteraceae | 8 |
| Heliopsis helianthoides | Sweet | Asteraceae | 8 |
| Hepatica americana | (DC.) Ker Gawl. | Ranunculaceae | 8 |
| Heracleum maximum | W.Bartram | Apiaceae | 8 |
| Hesperostipa comata | (Trin. & Rupr.) Barkworth | Poaceae | 8 |
| Hesperostipa spartea | (Trin.) Barkworth | Poaceae | 8 |
| Heteranthera dubia | (Jacq.) MacMill. | Pontederiaceae | 8 |
| Heuchera richardsonii | R.Br. | Saxifragaceae | 8 |
| Hexasepalum teres | (Walter) J.H.Kirkbr. | Rubiaceae | 8 |
| Hieracium albiflorum | Hook. | Asteraceae | 8 |
| Hieracium lachenalii | Suter | Asteraceae | 8 |
| Hieracium longipilum | Torr. ex Hook. | Asteraceae | 8 |
| Hieracium scabrum | Michx. | Asteraceae | 8 |
| Hieracium umbellatum | L. | Asteraceae | 8 |
| Hippuris vulgaris | L. | Plantaginaceae | 8 |
| Hordeum jubatum | L. | Poaceae | 8 |
| Houstonia caerulea | L. | Rubiaceae | 8 |
| Houstonia longifolia | Gaertn. | Rubiaceae | 8 |
| Hudsonia tomentosa | Nutt. | Cistaceae | 8 |
| Humulus americanus | Nutt. | Cannabaceae | 8 |
| Huperzia lucidula | (Michx.) Trevis. | Lycopodiaceae | 8 |
| Huperzia porophila | (F.E.Lloyd & Underw.) Holub | Lycopodiaceae | 8 |
| Huperzia selago | (L.) Bernh. ex Schrank & Mart. | Lycopodiaceae | 8 |
| Hybanthus concolor | Spreng. | Violaceae | 8 |
| Hydrastis canadensis | L. | Ranunculaceae | 8 |
| Hydrocotyle americana | L. | Araliaceae | 8 |
| Hydrogalium claytonii | (Michx.) Kadereit & Schneew. | Rubiaceae | 8 |
| Hydrogalium labradoricum | (Wiegand) Kadereit & Schneew. | Rubiaceae | 8 |
| Hydrogalium palustre | (L.) Kadereit & Schneew. | Rubiaceae | 8 |
| Hydrophyllum appendiculatum | Michx. | Hydrophyllaceae | 8 |
| Hydrophyllum canadense | L. | Hydrophyllaceae | 8 |
| Hydrophyllum virginianum | L. | Hydrophyllaceae | 8 |
| Hylodesmum glutinosum | (Muhl. ex Willd.) H.Ohashi & R.R.Mill | Fabaceae | 8 |
| Hylodesmum nudiflorum | (L.) H.Ohashi & R.R.Mill | Fabaceae | 8 |
| Hypericum ascyron | L. | Hypericaceae | 8 |
| Hypericum boreale | (Britton) E.P.Bicknell | Hypericaceae | 8 |
| Hypericum canadense | L. | Hypericaceae | 8 |
| Hypericum ellipticum | Hook. | Hypericaceae | 8 |
| Hypericum fraseri | (Spach) Steud. | Hypericaceae | 8 |
| Hypericum gentianoides | (L.) Britton, Sterns & Poggenb. | Hypericaceae | 8 |
| Hypericum kalmianum | L. | Hypericaceae | 8 |
| Hypericum majus | (A.Gray) Britton | Hypericaceae | 8 |
| Hypericum mutilum | L. | Hypericaceae | 8 |
| Hypericum prolificum | L. | Hypericaceae | 8 |
| Hypericum punctatum | Lam. | Hypericaceae | 8 |
| Hypericum sphaerocarpum | Michx. | Hypericaceae | 8 |
| Hypericum virginicum | L. | Hypericaceae | 8 |
| Hypopitys monotropa | Crantz | Ericaceae | 8 |
| Hypoxis hirsuta | (L.) Coville | Hypoxidaceae | 8 |
| Ilex mucronata | (L.) M.Powell, Savol. & S.Andrews | Aquifoliaceae | 8 |
| Ilex verticillata | (L.) A.Gray | Aquifoliaceae | 8 |
| Impatiens capensis | Meerb. | Balsaminaceae | 8 |
| Impatiens pallida | Nutt. | Balsaminaceae | 8 |
| Iodanthus pinnatifidus | Steud. | Brassicaceae | 8 |
| Ionactis linariifolia | (L.) Greene | Asteraceae | 8 |
| Iris lacustris | Nutt. | Iridaceae | 8 |
| Iris versicolor | L. | Iridaceae | 8 |
| Iris virginica | L. | Iridaceae | 8 |
| Isoetes echinospora | Durieu | Isoetaceae | 8 |
| Iva annua | L. | Asteraceae | 8 |
| Iva axillaris | Pursh | Asteraceae | 8 |
| Jeffersonia diphylla | (L.) Pers. | Berberidaceae | 8 |
| Juglans cinerea | L. | Juglandaceae | 8 |
| Juglans nigra | L. | Juglandaceae | 8 |
| Juncus acuminatus | Michx. | Juncaceae | 8 |
| Juncus alpinoarticulatus | Chaix | Juncaceae | 8 |
| Juncus anthelatus | (Wiegand) R.E.Brooks & Whittem. | Juncaceae | 8 |
| Juncus articulatus | L. | Juncaceae | 8 |
| Juncus balticus | Willd. | Juncaceae | 8 |
| Juncus bufonius | L. | Juncaceae | 8 |
| Juncus canadensis | J.Gay ex Laharpe | Juncaceae | 8 |
| Juncus dudleyi | Wiegand | Juncaceae | 8 |
| Juncus effusus | L. | Juncaceae | 8 |
| Juncus filiformis | L. | Juncaceae | 8 |
| Juncus gerardi | Loisel. | Juncaceae | 8 |
| Juncus interior | Wiegand | Juncaceae | 8 |
| Juncus marginatus | Rostk. | Juncaceae | 8 |
| Juncus nodosus | L. | Juncaceae | 8 |
| Juncus pelocarpus | E.Mey. | Juncaceae | 8 |
| Juncus pylaei | Laharpe | Juncaceae | 8 |
| Juncus stygius | L. | Juncaceae | 8 |
| Juncus tenuis | Willd. | Juncaceae | 8 |
| Juncus torreyi | Coville | Juncaceae | 8 |
| Juncus tweedyi | Rydb. | Juncaceae | 8 |
| Juniperus communis | L. | Cupressaceae | 8 |
| Juniperus horizontalis | Moench | Cupressaceae | 8 |
| Juniperus virginiana | L. | Cupressaceae | 8 |
| Kalmia polifolia | Wangenh. | Ericaceae | 8 |
| Koeleria macrantha | (Ledeb.) Schult. | Poaceae | 8 |
| Koeleria spicata | (L.) Barberá, Quintanar, Soreng & P.M.Peterson | Poaceae | 8 |
| Krigia biflora | (Walter) S.F.Blake | Asteraceae | 8 |
| Krigia virginica | (L.) Willd. | Asteraceae | 8 |
| Lactuca biennis | (Moench) Fernald | Asteraceae | 8 |
| Lactuca canadensis | L. | Asteraceae | 8 |
| Lactuca floridana | (L.) Gaertn. | Asteraceae | 8 |
| Lactuca ludoviciana | (Nutt.) Riddell | Asteraceae | 8 |
| Lactuca oblongifolia | Nutt. | Asteraceae | 8 |
| Laportea canadensis | (L.) Wedd. | Urticaceae | 8 |
| Lappula occidentalis | (S.Watson) Greene | Boraginaceae | 8 |
| Larix laricina | (Du Roi) K.Koch | Pinaceae | 8 |
| Lathyrus japonicus | Willd. | Fabaceae | 8 |
| Lathyrus ochroleucus | Hook. | Fabaceae | 8 |
| Lathyrus palustris | L. | Fabaceae | 8 |
| Lathyrus venosus | Muhl. ex Willd. | Fabaceae | 8 |
| Lechea intermedia | Legg. ex Britton | Cistaceae | 8 |
| Lechea minor | L. | Cistaceae | 8 |
| Lechea mucronata | Raf. | Cistaceae | 8 |
| Lechea tenuifolia | Michx. | Cistaceae | 8 |
| Leersia lenticularis | Michx. | Poaceae | 8 |
| Leersia oryzoides | (L.) Sw. | Poaceae | 8 |
| Leersia virginica | Willd. | Poaceae | 8 |
| Lemna aequinoctialis | Welw. | Araceae | 8 |
| Lemna minor | L. | Araceae | 8 |
| Lemna trisulca | L. | Araceae | 8 |
| Lemna turionifera | Landolt | Araceae | 8 |
| Lepidium densiflorum | Schrad. | Brassicaceae | 8 |
| Lepidium virginicum | L. | Brassicaceae | 8 |
| Lespedeza capitata | Michx. | Fabaceae | 8 |
| Lespedeza frutescens | (L.) Hornem. | Fabaceae | 8 |
| Lespedeza leptostachya | Engelm. ex A.Gray | Fabaceae | 8 |
| Lespedeza procumbens | Michx. | Fabaceae | 8 |
| Lespedeza repens | (L.) W.P.C.Barton | Fabaceae | 8 |
| Lespedeza violacea | (L.) Pers. | Fabaceae | 8 |
| Lespedeza virginica | (L.) Britton | Fabaceae | 8 |
| Leymus mollis | (Trin.) Pilg. | Poaceae | 8 |
| Liatris aspera | Michx. | Asteraceae | 8 |
| Liatris cylindracea | Michx. | Asteraceae | 8 |
| Liatris ligulistylis | (A.Nelson) K.Schum. | Asteraceae | 8 |
| Liatris punctata | Hook. | Asteraceae | 8 |
| Liatris pycnostachya | Michx. | Asteraceae | 8 |
| Liatris scariosa | (L.) Willd. | Asteraceae | 8 |
| Liatris spicata | (L.) Willd. | Asteraceae | 8 |
| Lilium michiganense | Farw. | Liliaceae | 8 |
| Lilium philadelphicum | L. | Liliaceae | 8 |
| Lindernia dubia | (L.) Pennell | Linderniaceae | 8 |
| Linnaea borealis | L. | Caprifoliaceae | 8 |
| Linum medium | (Planch.) Britton | Linaceae | 8 |
| Linum rigidum | Pursh | Linaceae | 8 |
| Linum sulcatum | Riddell | Linaceae | 8 |
| Liparis liliifolia | (L.) Rich. ex Lindl. | Orchidaceae | 8 |
| Liparis loeselii | (L.) Rich. | Orchidaceae | 8 |
| Lithospermum canescens | Lehm. | Boraginaceae | 8 |
| Lithospermum caroliniense | (J.F.Gmel.) MacMill. | Boraginaceae | 8 |
| Lithospermum incisum | Lehm. | Boraginaceae | 8 |
| Lithospermum latifolium | Michx. | Boraginaceae | 8 |
| Lithospermum occidentale | (Mack.) Weakley, Witsell & D.Estes | Boraginaceae | 8 |
| Lithospermum parviflorum | Weakley, Witsell & D.Estes | Boraginaceae | 8 |
| Lobelia cardinalis | L. | Campanulaceae | 8 |
| Lobelia dortmanna | L. | Campanulaceae | 8 |
| Lobelia inflata | L. | Campanulaceae | 8 |
| Lobelia kalmii | L. | Campanulaceae | 8 |
| Lobelia siphilitica | L. | Campanulaceae | 8 |
| Lobelia spicata | Lam. | Campanulaceae | 8 |
| Lonicera canadensis | Bartram & W.Bartram ex Marshall | Caprifoliaceae | 8 |
| Lonicera dioica | L. | Caprifoliaceae | 8 |
| Lonicera hirsuta | Eaton | Caprifoliaceae | 8 |
| Lonicera involucrata | (Richardson) Banks ex Spreng. | Caprifoliaceae | 8 |
| Lonicera oblongifolia | Hook. | Caprifoliaceae | 8 |
| Lonicera villosa | (Michx.) Schult. | Caprifoliaceae | 8 |
| Ludwigia alternifolia | L. | Onagraceae | 8 |
| Ludwigia decurrens | Walter | Onagraceae | 8 |
| Ludwigia palustris | (L.) Elliott | Onagraceae | 8 |
| Lupinus perennis | L. | Fabaceae | 8 |
| Lupinus polyphyllus | Lindl. | Fabaceae | 8 |
| Luzula acuminata | Raf. | Juncaceae | 8 |
| Luzula multiflora | (Ehrh.) Lej. | Juncaceae | 8 |
| Luzula parviflora | (Ehrh.) Desv. | Juncaceae | 8 |
| Lycopodiella inundata | (L.) Holub | Lycopodiaceae | 8 |
| Lycopodium clavatum | L. | 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 virginicus | L. | Lamiaceae | 8 |
| Lygodesmia juncea | (Pursh) Sweet | Asteraceae | 8 |
| Lysimachia borealis | (Raf.) U.Manns & Anderb. | Primulaceae | 8 |
| Lysimachia ciliata | L. | Primulaceae | 8 |
| Lysimachia hybrida | Michx. | Primulaceae | 8 |
| Lysimachia lanceolata | Walter | Primulaceae | 8 |
| Lysimachia quadriflora | Sims | Primulaceae | 8 |
| Lysimachia quadrifolia | L. | Primulaceae | 8 |
| Lysimachia terrestris | (L.) Britton, Sterns & Poggenb. | Primulaceae | 8 |
| Lysimachia thyrsiflora | L. | Primulaceae | 8 |
| Lythrum alatum | Pursh | Lythraceae | 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 |
| Malaxis unifolia | Michx. | Orchidaceae | 8 |
| Malus coronaria | (L.) Mill. | Rosaceae | 8 |
| Malus ioensis | (Alph.Wood) Britton | Rosaceae | 8 |
| Matricaria discoidea | DC. | Asteraceae | 8 |
| Medeola virginiana | L. | Liliaceae | 8 |
| Melica nitens | (Scribn.) Nutt. ex Piper | Poaceae | 8 |
| Menispermum canadense | L. | Menispermaceae | 8 |
| Mentha canadensis | L. | Lamiaceae | 8 |
| Menyanthes trifoliata | L. | Menyanthaceae | 8 |
| Mertensia virginica | (L.) Pers. ex Link | Boraginaceae | 8 |
| Micranthes pensylvanica | (L.) Haw. | Saxifragaceae | 8 |
| Milium effusum | L. | Poaceae | 8 |
| Mimulus ringens | L. | Phrymaceae | 8 |
| Mirabilis albida | (Walter) Heimerl | Nyctaginaceae | 8 |
| Mitchella repens | L. | Rubiaceae | 8 |
| Mitella diphylla | L. | Saxifragaceae | 8 |
| Mitella nuda | L. | Saxifragaceae | 8 |
| Moehringia lateriflora | (L.) Fenzl | Caryophyllaceae | 8 |
| Moehringia macrophylla | (Hook.) Fenzl | Caryophyllaceae | 8 |
| Mollugo verticillata | L. | Molluginaceae | 8 |
| Monarda fistulosa | L. | Lamiaceae | 8 |
| Monarda punctata | L. | Lamiaceae | 8 |
| Moneses uniflora | (L.) A.Gray | Ericaceae | 8 |
| Monotropa uniflora | L. | Ericaceae | 8 |
| Morus rubra | L. | Moraceae | 8 |
| Muenchhusia laevis | (All.) M.M.Hanes & R.L.Barrett | Malvaceae | 8 |
| Muenchhusia moscheutos | (L.) M.M.Hanes & R.L.Barrett | Malvaceae | 8 |
| Muhlenbergia asperifolia | (Nees & Meyen ex Trin.) Parodi | Poaceae | 8 |
| Muhlenbergia cuspidata | (Torr. ex Hook.) Rydb. | Poaceae | 8 |
| Muhlenbergia frondosa | (Poir.) Fernald | Poaceae | 8 |
| Muhlenbergia glomerata | (Willd.) Trin. | Poaceae | 8 |
| Muhlenbergia mexicana | (L.) 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 |
| Muhlenbergia schreberi | J.F.Gmel. | Poaceae | 8 |
| Muhlenbergia sylvatica | Torr. | Poaceae | 8 |
| Muhlenbergia tenuiflora | (Willd.) Britton, Sterns & Poggenb. | Poaceae | 8 |
| Muhlenbergia uniflora | (Muhl.) Fernald | Poaceae | 8 |
| Myosotis laxa | Lehm. | Boraginaceae | 8 |
| Myosotis verna | Nutt. | Boraginaceae | 8 |
| Myrica gale | L. | Myricaceae | 8 |
| Myriophyllum alterniflorum | DC. | Haloragaceae | 8 |
| Myriophyllum farwellii | Morong | Haloragaceae | 8 |
| Myriophyllum heterophyllum | Michx. | Haloragaceae | 8 |
| Myriophyllum sibiricum | Kom. | Haloragaceae | 8 |
| Myriophyllum verticillatum | L. | Haloragaceae | 8 |
| Myriopteris lanosa | (Michx.) Grusz & Windham | Pteridaceae | 8 |
| Nabalus albus | (L.) Hook. | Asteraceae | 8 |
| Nabalus crepidineus | (Michx.) DC. | Asteraceae | 8 |
| Nabalus racemosus | (Michx.) Hook. | Asteraceae | 8 |
| Najas flexilis | (Willd.) Rostk. & W.L.E.Schmidt | Hydrocharitaceae | 8 |
| Najas guadalupensis | (Spreng.) Magnus | Hydrocharitaceae | 8 |
| Najas marina | L. | Hydrocharitaceae | 8 |
| Napaea dioica | L. | Malvaceae | 8 |
| Nassella viridula | (Trin.) Barkworth | Poaceae | 8 |
| Nelumbo lutea | (Willd.) Pers. | Nelumbonaceae | 8 |
| Neottia convallarioides | (Sw.) Rich. | Orchidaceae | 8 |
| Neottia cordata | (L.) Rich. | Orchidaceae | 8 |
| Nothocalais cuspidata | (Pursh) Greene | Asteraceae | 8 |
| Nuphar advena | (Aiton) W.T.Aiton | Nymphaeaceae | 8 |
| Nuphar microphylla | Fernald | Nymphaeaceae | 8 |
| Nuphar variegata | Engelm. ex Durand | Nymphaeaceae | 8 |
| Nuttallanthus canadensis | (L.) D.A.Sutton | Plantaginaceae | 8 |
| Nymphaea odorata | Aiton | Nymphaeaceae | 8 |
| Nyssa sylvatica | Marshall | Nyssaceae | 8 |
| Oenothera biennis | L. | Onagraceae | 8 |
| Oenothera clelandii | W.Dietr., P.H.Raven & W.L.Wagner | Onagraceae | 8 |
| Oenothera filiformis | (Small) W.L.Wagner & Hoch | Onagraceae | 8 |
| Oenothera gaura | W.L.Wagner & Hoch | Onagraceae | 8 |
| Oenothera laciniata | Hill | Onagraceae | 8 |
| Oenothera nuttallii | Torr. & A.Gray | Onagraceae | 8 |
| Oenothera oakesiana | (A.Gray) J.W.Robbins ex S.Watson | Onagraceae | 8 |
| Oenothera parviflora | L. | Onagraceae | 8 |
| Oenothera perennis | L. | Onagraceae | 8 |
| Oenothera pilosella | Raf. | Onagraceae | 8 |
| Oenothera rhombipetala | Nutt. ex Torr. & A.Gray | Onagraceae | 8 |
| Oenothera serrulata | Nutt. | Onagraceae | 8 |
| Oenothera villosa | Thunb. | Onagraceae | 8 |
| Onoclea sensibilis | L. | Onocleaceae | 8 |
| Ophioglossum pusillum | Raf. | Ophioglossaceae | 8 |
| Ophioglossum vulgatum | L. | Ophioglossaceae | 8 |
| Opuntia cespitosa | Raf. | Cactaceae | 8 |
| Opuntia fragilis | (Nutt.) Haw. | Cactaceae | 8 |
| Opuntia macrorhiza | Engelm. | Cactaceae | 8 |
| Orobanche fasciculata | Nutt. | Orobanchaceae | 8 |
| Orobanche ludoviciana | Nutt. | Orobanchaceae | 8 |
| Orobanche uniflora | L. | Orobanchaceae | 8 |
| Orthilia secunda | (L.) House | Ericaceae | 8 |
| Oryzopsis asperifolia | Michx. | Poaceae | 8 |
| Osmorhiza berteroi | DC. | Apiaceae | 8 |
| Osmorhiza claytonii | C.B.Clarke | Apiaceae | 8 |
| Osmorhiza longistylis | DC. | Apiaceae | 8 |
| Osmunda spectabilis | Willd. | Osmundaceae | 8 |
| Osmundastrum cinnamomeum | (L.) C.Presl | Osmundaceae | 8 |
| Ostrya virginiana | (Mill.) K.Koch | Betulaceae | 8 |
| Oxalis dillenii | Jacq. | Oxalidaceae | 8 |
| Oxalis montana | Raf. | Oxalidaceae | 8 |
| Oxalis stricta | L. | Oxalidaceae | 8 |
| Oxalis violacea | L. | Oxalidaceae | 8 |
| Oxybaphus nyctagineus | (Michx.) Sweet | Nyctaginaceae | 8 |
| Oxypolis rigidior | (L.) Raf. | Apiaceae | 8 |
| Oxytropis campestris | (L.) DC. | Fabaceae | 8 |
| Packera aurea | (L.) Á.Löve & D.Löve | Asteraceae | 8 |
| Packera indecora | (Greene) Á.Löve & D.Löve | Asteraceae | 8 |
| Packera paupercula | (Michx.) Á.Löve & D.Löve | Asteraceae | 8 |
| Packera plattensis | (Nutt.) W.A.Weber & Á.Löve | Asteraceae | 8 |
| Packera pseudaurea | (Rydb.) W.A.Weber & Á.Löve | Asteraceae | 8 |
| Panax quinquefolius | L. | Araliaceae | 8 |
| Panax trifolius | L. | Araliaceae | 8 |
| Panicum capillare | L. | Poaceae | 8 |
| Panicum dichotomiflorum | Michx. | Poaceae | 8 |
| Panicum flexile | (Gatt.) Scribn. | Poaceae | 8 |
| Panicum virgatum | L. | Poaceae | 8 |
| Parietaria pensylvanica | Muhl. ex Willd. | Urticaceae | 8 |
| Parnassia glauca | Raf. | Celastraceae | 8 |
| Parnassia palustris | L. | Celastraceae | 8 |
| Parnassia parviflora | DC. | Celastraceae | 8 |
| Paronychia canadensis | (L.) Alph.Wood | Caryophyllaceae | 8 |
| Paronychia fastigiata | (Raf.) Fernald | Caryophyllaceae | 8 |
| Parthenium integrifolium | L. | Asteraceae | 8 |
| Parthenocissus quinquefolia | (L.) Planch. | Vitaceae | 8 |
| Paspalum setaceum | Michx. | Poaceae | 8 |
| Patis racemosa | (Sm.) Romasch., P.M.Peterson & Soreng | Poaceae | 8 |
| Pedicularis canadensis | L. | Orobanchaceae | 8 |
| Pedicularis lanceolata | Michx. | Orobanchaceae | 8 |
| Pediomelum argophyllum | (Pursh) J.W.Grimes | Fabaceae | 8 |
| Pediomelum esculentum | (Pursh) Rydb. | Fabaceae | 8 |
| Pediomelum tenuiflorum | (Pursh) A.N.Egan | Fabaceae | 8 |
| Pellaea atropurpurea | (L.) Link | Pteridaceae | 8 |
| Pellaea glabella | Mett. | Pteridaceae | 8 |
| Peltandra virginica | (L.) Schott | Araceae | 8 |
| Penstemon bradburyi | Pursh | Plantaginaceae | 8 |
| Penstemon digitalis | Nutt. ex Sims | Plantaginaceae | 8 |
| Penstemon gracilis | Nutt. | Plantaginaceae | 8 |
| Penstemon hirsutus | (L.) Willd. | Plantaginaceae | 8 |
| Penstemon pallidus | Small | Plantaginaceae | 8 |
| Penstemon tubaeflorus | Nutt. | Plantaginaceae | 8 |
| Penthorum sedoides | L. | Penthoraceae | 8 |
| Persicaria amphibia | (L.) Delarbre | Polygonaceae | 8 |
| Persicaria arifolia | (L.) Haraldson | Polygonaceae | 8 |
| Persicaria hydropiperoides | (Michx.) Small | Polygonaceae | 8 |
| Persicaria lapathifolia | (L.) Delarbre | Polygonaceae | 8 |
| Persicaria pensylvanica | (L.) M.Gómez | Polygonaceae | 8 |
| Persicaria punctata | Small | Polygonaceae | 8 |
| Persicaria sagittata | (L.) H.Gross | Polygonaceae | 8 |
| Persicaria virginiana | (L.) Gaertn. | Polygonaceae | 8 |
| Petasites frigidus | (L.) Fr. | Asteraceae | 8 |
| Phacelia distans | Benth. | Hydrophyllaceae | 8 |
| Phalaris arundinacea | L. | Poaceae | 8 |
| Phegopteris connectilis | (Michx.) Watt | Thelypteridaceae | 8 |
| Phemeranthus rugospermus | (Holz.) Kiger | Montiaceae | 8 |
| Phlox bifida | L.C.Beck | Polemoniaceae | 8 |
| Phlox divaricata | L. | Polemoniaceae | 8 |
| Phlox glaberrima | L. | Polemoniaceae | 8 |
| Phlox pilosa | L. | Polemoniaceae | 8 |
| Phlox subulata | L. | Polemoniaceae | 8 |
| Phragmites australis | (Cav.) Steud. | Poaceae | 8 |
| Phryma leptostachya | L. | Phrymaceae | 8 |
| Phyla lanceolata | (Michx.) Greene | Verbenaceae | 8 |
| Physalis heterophylla | Nees | Solanaceae | 8 |
| Physalis longifolia | Nutt. | Solanaceae | 8 |
| Physalis pubescens | L. | Solanaceae | 8 |
| Physalis virginiana | Mill. | Solanaceae | 8 |
| Physaria ludoviciana | (Nutt.) O'Kane & Al-Shehbaz | Brassicaceae | 8 |
| Physocarpus intermedius | (Rydb.) C.K.Schneid. | Rosaceae | 8 |
| Physocarpus opulifolius | (L.) Maxim. | Rosaceae | 8 |
| Physostegia virginiana | (L.) Benth. | Lamiaceae | 8 |
| Phytolacca americana | L. | Phytolaccaceae | 8 |
| Picea glauca | (Moench) Voss | Pinaceae | 8 |
| Picea mariana | Britton, Sterns & Poggenb. | Pinaceae | 8 |
| Pilea fontana | (Lunell) Rydb. | Urticaceae | 8 |
| Pilea pumila | A.Gray | Urticaceae | 8 |
| Pinguicula vulgaris | L. | Lentibulariaceae | 8 |
| Pinus banksiana | Lamb. | Pinaceae | 8 |
| Pinus resinosa | Aiton | Pinaceae | 8 |
| Pinus strobus | L. | Pinaceae | 8 |
| Piptatheropsis pungens | (Torr. ex Spreng.) Romasch., P.M.Peterson & Soreng | Poaceae | 8 |
| Plagiobothrys scouleri | (Hook. & Arn.) I.M.Johnst. | Boraginaceae | 8 |
| Plantago cordata | Lam. | Plantaginaceae | 8 |
| Plantago patagonica | Jacq. | Plantaginaceae | 8 |
| Plantago rugelii | Decne. | Plantaginaceae | 8 |
| Plantago virginica | L. | Plantaginaceae | 8 |
| Platanthera aquilonis | Sheviak | Orchidaceae | 8 |
| Platanthera ciliaris | (L.) Lindl. | Orchidaceae | 8 |
| Platanthera clavellata | (Michx.) Luer | Orchidaceae | 8 |
| Platanthera dilatata | (Pursh) Lindl. ex L.C.Beck | Orchidaceae | 8 |
| Platanthera flava | (L.) Lindl. | Orchidaceae | 8 |
| Platanthera hookeri | (Torr.) Lindl. | Orchidaceae | 8 |
| Platanthera huronensis | Lindl. | Orchidaceae | 8 |
| Platanthera lacera | (Michx.) G.Don | Orchidaceae | 8 |
| Platanthera leucophaea | (Nutt.) Lindl. | Orchidaceae | 8 |
| Platanthera obtusata | (Banks ex Pursh) Lindl. | Orchidaceae | 8 |
| Platanthera orbiculata | (Pursh) Lindl. | Orchidaceae | 8 |
| Platanthera psycodes | (L.) Lindl. | Orchidaceae | 8 |
| Platanus occidentalis | L. | Platanaceae | 8 |
| Poa alsodes | A.Gray | 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 sylvestris | A.Gray | Poaceae | 8 |
| Podophyllum peltatum | L. | Berberidaceae | 8 |
| Pogonia ophioglossoides | (L.) Ker Gawl. | Orchidaceae | 8 |
| Polemonium reptans | L. | Polemoniaceae | 8 |
| Polygala senega | L. | Polygalaceae | 8 |
| Polygonatum biflorum | (Walter) Elliott | Asparagaceae | 8 |
| Polygonatum pubescens | (Willd.) Pursh | Asparagaceae | 8 |
| Polygonella articulata | Meisn. | Polygonaceae | 8 |
| Polygonum achoreum | S.F.Blake | Polygonaceae | 8 |
| Polygonum aviculare | L. | Polygonaceae | 8 |
| Polygonum tenue | Michx. | Polygonaceae | 8 |
| Polymnia canadensis | L. | Asteraceae | 8 |
| Polypodium virginianum | L. | Polypodiaceae | 8 |
| Polystichum acrostichoides | (Michx.) Schott | Dryopteridaceae | 8 |
| Polystichum braunii | (Spenn.) Fée | Dryopteridaceae | 8 |
| Polystichum lonchitis | (L.) Roth | Dryopteridaceae | 8 |
| Polytaenia nuttallii | DC. | Apiaceae | 8 |
| Pontederia cordata | L. | Pontederiaceae | 8 |
| Populus balsamifera | L. | Salicaceae | 8 |
| Populus deltoides | W.Bartram ex Marshall | Salicaceae | 8 |
| Populus grandidentata | Michx. | Salicaceae | 8 |
| Populus tremuloides | Michx. | Salicaceae | 8 |
| Potamogeton alpinus | Balb. | Potamogetonaceae | 8 |
| Potamogeton amplifolius | Tuck. | Potamogetonaceae | 8 |
| Potamogeton berchtoldii | Fieber | Potamogetonaceae | 8 |
| Potamogeton diversifolius | Raf. | Potamogetonaceae | 8 |
| Potamogeton epihydrus | Raf. | Potamogetonaceae | 8 |
| Potamogeton foliosus | Raf. | Potamogetonaceae | 8 |
| Potamogeton friesii | Rupr. | Potamogetonaceae | 8 |
| Potamogeton gramineus | L. | Potamogetonaceae | 8 |
| Potamogeton hillii | Morong | Potamogetonaceae | 8 |
| Potamogeton illinoensis | Morong | Potamogetonaceae | 8 |
| Potamogeton natans | L. | Potamogetonaceae | 8 |
| Potamogeton nodosus | Poir. | Potamogetonaceae | 8 |
| Potamogeton obtusifolius | Mert. & W.D.J.Koch | Potamogetonaceae | 8 |
| Potamogeton perfoliatus | L. | Potamogetonaceae | 8 |
| Potamogeton praelongus | Wulfen | Potamogetonaceae | 8 |
| Potamogeton pusillus | L. | Potamogetonaceae | 8 |
| Potamogeton richardsonii | Rydb. | Potamogetonaceae | 8 |
| Potamogeton robbinsii | Oakes | Potamogetonaceae | 8 |
| Potamogeton spirillus | Tuck. | Potamogetonaceae | 8 |
| Potamogeton strictifolius | A.Benn. | Potamogetonaceae | 8 |
| Potamogeton vaseyi | J.W.Robbins | Potamogetonaceae | 8 |
| Potamogeton zosteriformis | Fernald | Potamogetonaceae | 8 |
| Potentilla gracilis | Douglas ex Hook. | Rosaceae | 8 |
| Potentilla norvegica | L. | Rosaceae | 8 |
| Potentilla rivalis | Nutt. | Rosaceae | 8 |
| Potentilla simplex | Michx. | Rosaceae | 8 |
| Primula fassettii | A.R.Mast & Reveal | Primulaceae | 8 |
| Primula meadia | (L.) A.R.Mast & Reveal | Primulaceae | 8 |
| Primula mistassinica | Michx. | Primulaceae | 8 |
| Proserpinaca palustris | L. | Haloragaceae | 8 |
| Prunella vulgaris | L. | Lamiaceae | 8 |
| Prunus americana | Marshall | Rosaceae | 8 |
| Prunus nigra | Aiton | Rosaceae | 8 |
| Prunus pensylvanica | L.f. | Rosaceae | 8 |
| Prunus pumila | L. | Rosaceae | 8 |
| Prunus serotina | Ehrh. | Rosaceae | 8 |
| Prunus susquehanae | Willd. | Rosaceae | 8 |
| Prunus virginiana | L. | Rosaceae | 8 |
| Pseudognaphalium macounii | (Greene) Kartesz | Asteraceae | 8 |
| Ptelea trifoliata | L. | Rutaceae | 8 |
| Pterospora andromedea | Nutt. | Ericaceae | 8 |
| Puccinellia nuttalliana | (Schult.) Hitchc. | Poaceae | 8 |
| Pulsatilla nuttalliana | (DC.) Spreng. | Ranunculaceae | 8 |
| Pycnanthemum tenuifolium | Schrad. | Lamiaceae | 8 |
| Pycnanthemum virginianum | (L.) T.Durand & B.D.Jacks. ex B.L.Rob. & Fernald | Lamiaceae | 8 |
| Pyrola americana | Sweet | Ericaceae | 8 |
| Pyrola asarifolia | Michx. | Ericaceae | 8 |
| Pyrola chlorantha | Sw. | Ericaceae | 8 |
| Pyrola elliptica | Nutt. | Ericaceae | 8 |
| Pyrola minor | L. | Ericaceae | 8 |
| Quercus alba | L. | Fagaceae | 8 |
| Quercus bicolor | Willd. | Fagaceae | 8 |
| Quercus coccinea | Münchh. | Fagaceae | 8 |
| Quercus ellipsoidalis | E.J.Hill | Fagaceae | 8 |
| Quercus macrocarpa | Michx. | Fagaceae | 8 |
| Quercus muehlenbergii | Engelm. | Fagaceae | 8 |
| Quercus palustris | Münchh. | Fagaceae | 8 |
| Quercus rubra | L. | Fagaceae | 8 |
| Quercus velutina | Lam. | Fagaceae | 8 |
| Ranunculus abortivus | L. | Ranunculaceae | 8 |
| Ranunculus carolinianus | DC. | Ranunculaceae | 8 |
| Ranunculus fascicularis | Muhl. ex Bigelow | Ranunculaceae | 8 |
| Ranunculus flabellaris | Raf. | Ranunculaceae | 8 |
| Ranunculus flammula | L. | Ranunculaceae | 8 |
| Ranunculus gmelinii | DC. | Ranunculaceae | 8 |
| Ranunculus hispidus | Michx. | Ranunculaceae | 8 |
| Ranunculus lapponicus | L. | Ranunculaceae | 8 |
| Ranunculus longirostris | Godr. | Ranunculaceae | 8 |
| Ranunculus minimus | E.H.L.Krause | Ranunculaceae | 8 |
| Ranunculus pensylvanicus | L.f. | Ranunculaceae | 8 |
| Ranunculus recurvatus | Poir. | Ranunculaceae | 8 |
| Ranunculus reptans | L. | Ranunculaceae | 8 |
| Ranunculus rhomboideus | Goldie | Ranunculaceae | 8 |
| Ranunculus sceleratus | L. | Ranunculaceae | 8 |
| Ranunculus trichophyllus | Chaix | Ranunculaceae | 8 |
| Ratibida columnifera | (Nutt.) Wooton & Standl. | Asteraceae | 8 |
| Ratibida pinnata | (Vent.) Barnhart | Asteraceae | 8 |
| Rhamnus alnifolia | L'Hér. | Rhamnaceae | 8 |
| Rhamnus lanceolata | Pursh | Rhamnaceae | 8 |
| Rhexia virginica | L. | Melastomataceae | 8 |
| Rhododendron groenlandicum | (Oeder) Kron & Judd | Ericaceae | 8 |
| Rhododendron lapponicum | (L.) Wahlenb. | Ericaceae | 8 |
| Rhus aromatica | Aiton | Anacardiaceae | 8 |
| Rhus copallinum | L. | Anacardiaceae | 8 |
| Rhus glabra | L. | Anacardiaceae | 8 |
| Rhus typhina | L. | Anacardiaceae | 8 |
| Rhynchospora alba | (L.) Vahl | Cyperaceae | 8 |
| Rhynchospora capillacea | Torr. | Cyperaceae | 8 |
| Rhynchospora capitellata | (Michx.) Vahl | Cyperaceae | 8 |
| Rhynchospora fusca | (L.) W.T.Aiton | Cyperaceae | 8 |
| Ribes americanum | Mill. | Grossulariaceae | 8 |
| Ribes aureum | Pursh | Grossulariaceae | 8 |
| Ribes cynosbati | L. | Grossulariaceae | 8 |
| Ribes glandulosum | Weber | Grossulariaceae | 8 |
| Ribes hirtellum | Michx. | Grossulariaceae | 8 |
| Ribes hudsonianum | Richardson | Grossulariaceae | 8 |
| Ribes lacustre | (Pers.) Poir. | Grossulariaceae | 8 |
| Ribes missouriense | Nutt. | Grossulariaceae | 8 |
| Ribes oxyacanthoides | L. | Grossulariaceae | 8 |
| Ribes triste | Pall. | Grossulariaceae | 8 |
| Rorippa palustris | (L.) Besser | Brassicaceae | 8 |
| Rorippa sessiliflora | (Nutt.) Hitchc. | Brassicaceae | 8 |
| Rosa acicularis | Lindl. | Rosaceae | 8 |
| Rosa arkansana | Porter | Rosaceae | 8 |
| Rosa blanda | Aiton | Rosaceae | 8 |
| Rosa carolina | L. | Rosaceae | 8 |
| Rosa palustris | Marshall | Rosaceae | 8 |
| Rosa setigera | Michx. | Rosaceae | 8 |
| Rosa woodsii | Lindl. | Rosaceae | 8 |
| Rotala ramosior | (L.) Koehne | Lythraceae | 8 |
| Rubus allegheniensis | Porter | Rosaceae | 8 |
| Rubus canadensis | L. | Rosaceae | 8 |
| Rubus flagellaris | Willd. | Rosaceae | 8 |
| Rubus hispidus | L. | Rosaceae | 8 |
| Rubus idaeus | L. | Rosaceae | 8 |
| Rubus occidentalis | L. | Rosaceae | 8 |
| Rubus odoratus | L. | Rosaceae | 8 |
| Rubus parviflorus | Nutt. | Rosaceae | 8 |
| Rubus pubescens | Raf. | Rosaceae | 8 |
| Rudbeckia fulgida | Aiton | Asteraceae | 8 |
| Rudbeckia hirta | L. | Asteraceae | 8 |
| Rudbeckia laciniata | L. | Asteraceae | 8 |
| Rudbeckia subtomentosa | Pursh | Asteraceae | 8 |
| Rudbeckia triloba | L. | Asteraceae | 8 |
| Ruellia humilis | Nutt. | Acanthaceae | 8 |
| Rumex altissimus | Alph.Wood | Polygonaceae | 8 |
| Rumex britannica | L. | Polygonaceae | 8 |
| Rumex maritimus | L. | Polygonaceae | 8 |
| Rumex triangulivalvis | (Danser) Rech.f. | Polygonaceae | 8 |
| Rumex venosus | Pursh | Polygonaceae | 8 |
| Rumex verticillatus | L. | Polygonaceae | 8 |
| Ruppia cirrhosa | (Petagna) Grande | Ruppiaceae | 8 |
| Sabatia angularis | (L.) Pursh | Gentianaceae | 8 |
| Sabulina dawsonensis | (Britton) Rydb. | Caryophyllaceae | 8 |
| Sabulina michauxii | (Fenzl) Dillenb. & Kadereit | Caryophyllaceae | 8 |
| Sabulina patula | (Michx.) Small ex Rydb. | Caryophyllaceae | 8 |
| Sagittaria brevirostra | Mack. & Bush | Alismataceae | 8 |
| Sagittaria cristata | Engelm. | Alismataceae | 8 |
| Sagittaria cuneata | E.Sheld. | Alismataceae | 8 |
| Sagittaria graminea | Michx. | Alismataceae | 8 |
| Sagittaria latifolia | Willd. | Alismataceae | 8 |
| Sagittaria montevidensis | Cham. & Schltdl. | Alismataceae | 8 |
| Sagittaria rigida | Pursh | Alismataceae | 8 |
| Salix amygdaloides | Andersson | Salicaceae | 8 |
| Salix bebbiana | Sarg. | Salicaceae | 8 |
| Salix candida | Flüggé ex Willd. | Salicaceae | 8 |
| Salix cordata | Michx. | Salicaceae | 8 |
| Salix discolor | Muhl. | Salicaceae | 8 |
| Salix eriocephala | Michx. | Salicaceae | 8 |
| Salix humilis | Marshall | Salicaceae | 8 |
| Salix interior | Rowlee | Salicaceae | 8 |
| Salix lucida | Muhl. | Salicaceae | 8 |
| Salix myricoides | Muhl. | Salicaceae | 8 |
| Salix nigra | Marshall | Salicaceae | 8 |
| Salix pedicellaris | Pursh | Salicaceae | 8 |
| Salix pellita | (Andersson) Bebb | Salicaceae | 8 |
| Salix petiolaris | Sm. | Salicaceae | 8 |
| Salix planifolia | Pursh | Salicaceae | 8 |
| Salix pyrifolia | Andersson | Salicaceae | 8 |
| Salix sericea | Marshall | Salicaceae | 8 |
| Salix serissima | (L.H.Bailey ex Arthur) Fernald | Salicaceae | 8 |
| Salvia reflexa | Hornem. | Lamiaceae | 8 |
| Sambucus canadensis | L. | Viburnaceae | 8 |
| Sambucus racemosa | L. | Viburnaceae | 8 |
| Samolus parviflorus | Raf. | Primulaceae | 8 |
| Sanguinaria canadensis | L. | Papaveraceae | 8 |
| Sanicula canadensis | L. | Apiaceae | 8 |
| Sanicula marilandica | L. | Apiaceae | 8 |
| Sanicula odorata | (Raf.) K.M.Pryer & L.R.Phillippe | Apiaceae | 8 |
| Sanicula trifoliata | E.P.Bicknell | Apiaceae | 8 |
| Sarracenia purpurea | L. | Sarraceniaceae | 8 |
| Saururus cernuus | L. | Saururaceae | 8 |
| Sceptridium dissectum | (Spreng.) Lyon | Ophioglossaceae | 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 |
| Schoenoplectiella purshiana | (Fernald) Lye | Cyperaceae | 8 |
| Schoenoplectiella smithii | (A.Gray) Hayas. | Cyperaceae | 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 subterminalis | (Torr.) Soják | Cyperaceae | 8 |
| Schoenoplectus tabernaemontani | (C.C.Gmel.) Palla | Cyperaceae | 8 |
| Schoenoplectus torreyi | (Olney) Palla | Cyperaceae | 8 |
| Scirpus atrocinctus | Fernald | Cyperaceae | 8 |
| Scirpus atrovirens | Willd. | Cyperaceae | 8 |
| Scirpus cyperinus | (L.) Kunth | Cyperaceae | 8 |
| Scirpus georgianus | R.M.Harper | Cyperaceae | 8 |
| Scirpus hattorianus | Makino | Cyperaceae | 8 |
| Scirpus microcarpus | J.Presl & C.Presl | Cyperaceae | 8 |
| Scirpus pedicellatus | Fernald | Cyperaceae | 8 |
| Scirpus pendulus | Muhl. | Cyperaceae | 8 |
| Scleria triglomerata | Michx. | Cyperaceae | 8 |
| Scleria verticillata | Muhl. ex Willd. | Cyperaceae | 8 |
| Scrophularia lanceolata | Pursh | Scrophulariaceae | 8 |
| Scrophularia marilandica | L. | Scrophulariaceae | 8 |
| Scutellaria galericulata | L. | Lamiaceae | 8 |
| Scutellaria incana | Biehler | Lamiaceae | 8 |
| Scutellaria lateriflora | L. | Lamiaceae | 8 |
| Scutellaria ovata | Hill | Lamiaceae | 8 |
| Scutellaria parvula | Michx. | Lamiaceae | 8 |
| Selaginella eclipes | W.R.Buck | Selaginellaceae | 8 |
| Selaginella rupestris | (L.) Spring | Selaginellaceae | 8 |
| Selaginella spinulosa | A.Braun ex Döll | Selaginellaceae | 8 |
| Senna hebecarpa | (Fernald) H.S.Irwin & Barneby | Fabaceae | 8 |
| Senna marilandica | (L.) Link | Fabaceae | 8 |
| Shepherdia argentea | (Pursh) Nutt. | Elaeagnaceae | 8 |
| Shepherdia canadensis | (L.) Nutt. | Elaeagnaceae | 8 |
| Sibbaldia tridentata | (Aiton) Paule & Soják | Rosaceae | 8 |
| Sicyos angulatus | L. | Cucurbitaceae | 8 |
| Silene antirrhina | L. | Caryophyllaceae | 8 |
| Silene stellata | W.T.Aiton | Caryophyllaceae | 8 |
| Silene virginica | L. | Caryophyllaceae | 8 |
| Silphium integrifolium | Michx. | Asteraceae | 8 |
| Silphium laciniatum | L. | Asteraceae | 8 |
| Silphium perfoliatum | L. | Asteraceae | 8 |
| Silphium terebinthinaceum | Jacq. | Asteraceae | 8 |
| Sisyrinchium albidum | Raf. | Iridaceae | 8 |
| Sisyrinchium angustifolium | Mill. | Iridaceae | 8 |
| Sisyrinchium atlanticum | E.P.Bicknell | Iridaceae | 8 |
| Sisyrinchium campestre | E.P.Bicknell | Iridaceae | 8 |
| Sisyrinchium montanum | Greene | Iridaceae | 8 |
| Sisyrinchium mucronatum | Michx. | Iridaceae | 8 |
| Sitobolium punctilobulum | (Michx.) Desv. | Dennstaedtiaceae | 8 |
| Sium suave | Walter | Apiaceae | 8 |
| Smilax ecirrhata | (Engelm. ex Kunth) S.Watson | Smilacaceae | 8 |
| Smilax illinoensis | Mangaly | Smilacaceae | 8 |
| Smilax tamnoides | L. | Smilacaceae | 8 |
| Solanum carolinense | L. | Solanaceae | 8 |
| Solanum emulans | Raf. | Solanaceae | 8 |
| Solidago altissima | L. | Asteraceae | 8 |
| Solidago bicolor | L. | Asteraceae | 8 |
| Solidago caesia | L. | Asteraceae | 8 |
| Solidago canadensis | L. | Asteraceae | 8 |
| Solidago flexicaulis | L. | Asteraceae | 8 |
| Solidago gigantea | Aiton | Asteraceae | 8 |
| Solidago gillmanii | (A.Gray) E.S.Steele | Asteraceae | 8 |
| Solidago hispida | Muhl. ex Willd. | Asteraceae | 8 |
| Solidago juncea | Aiton | Asteraceae | 8 |
| Solidago missouriensis | Nutt. | Asteraceae | 8 |
| Solidago nemoralis | Aiton | Asteraceae | 8 |
| Solidago ohioensis | Riddell | Asteraceae | 8 |
| Solidago patula | Muhl. ex Willd. | Asteraceae | 8 |
| Solidago ptarmicoides | (Torr. & A.Gray) B.Boivin | Asteraceae | 8 |
| Solidago riddellii | Frank | Asteraceae | 8 |
| Solidago rigida | L. | Asteraceae | 8 |
| Solidago rigidiuscula | (Torr. & A.Gray) Porter | Asteraceae | 8 |
| Solidago rugosa | Mill. | Asteraceae | 8 |
| Solidago sciaphila | E.S.Steele | Asteraceae | 8 |
| Solidago speciosa | Nutt. | Asteraceae | 8 |
| Solidago uliginosa | Nutt. | Asteraceae | 8 |
| Solidago ulmifolia | Muhl. ex Willd. | Asteraceae | 8 |
| Sorbus americana | Marshall | Rosaceae | 8 |
| Sorbus decora | (Sarg.) C.K.Schneid. | Rosaceae | 8 |
| Sorghastrum nutans | (L.) Nash | Poaceae | 8 |
| Sparganium americanum | Nutt. | Typhaceae | 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 |
| 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 tomentosa | L. | Rosaceae | 8 |
| Spiranthes incurva | (Jenn.) M.C.Pace | Orchidaceae | 8 |
| Spiranthes lacera | (Raf.) Raf. | Orchidaceae | 8 |
| Spiranthes lucida | (H.H.Eaton) Ames | Orchidaceae | 8 |
| Spiranthes magnicamporum | Sheviak | Orchidaceae | 8 |
| Spiranthes ovalis | Lindl. | Orchidaceae | 8 |
| Spiranthes romanzoffiana | Cham. | Orchidaceae | 8 |
| Spirodela polyrhiza | (L.) Schleid. | Araceae | 8 |
| Sporobolus clandestinus | (Biehler) Hitchc. | Poaceae | 8 |
| Sporobolus compositus | (Poir.) Merr. | Poaceae | 8 |
| Sporobolus cryptandrus | (Torr.) A.Gray | Poaceae | 8 |
| Sporobolus heterolepis | (A.Gray) A.Gray | Poaceae | 8 |
| Sporobolus michauxianus | (Hitchc.) P.M.Peterson & Saarela | Poaceae | 8 |
| Sporobolus neglectus | Nash | Poaceae | 8 |
| Sporobolus rigidus | (Buckley) P.M.Peterson | Poaceae | 8 |
| Sporobolus vaginiflorus | (Torr. ex A.Gray) Alph.Wood | Poaceae | 8 |
| Stachys hispida | Pursh | Lamiaceae | 8 |
| Stachys pilosa | Nutt. | Lamiaceae | 8 |
| Stachys tenuifolia | Willd. | Lamiaceae | 8 |
| Staphylea trifolia | L. | Staphyleaceae | 8 |
| Stellaria borealis | Bigelow | Caryophyllaceae | 8 |
| Stellaria crassifolia | Ehrh. | Caryophyllaceae | 8 |
| Stellaria longifolia | Muhl. ex Willd. | Caryophyllaceae | 8 |
| Stellaria longipes | Goldie | Caryophyllaceae | 8 |
| Streptopus amplexifolius | (L.) DC. | Liliaceae | 8 |
| Streptopus lanceolatus | (Aiton) Reveal | Liliaceae | 8 |
| Strophostyles leiosperma | (Torr. & A.Gray) Piper | Fabaceae | 8 |
| Stuckenia filiformis | (Pers.) Börner | Potamogetonaceae | 8 |
| Stuckenia pectinata | (L.) Börner | Potamogetonaceae | 8 |
| Stylophorum diphyllum | (Michx.) Nutt. | Papaveraceae | 8 |
| Suaeda calceoliformis | (Hook.) Moq. | Chenopodiaceae | 8 |
| Sullivantia sullivantii | (Torr. & A.Gray) Britton | Saxifragaceae | 8 |
| Symphoricarpos albus | (L.) S.F.Blake | Caprifoliaceae | 8 |
| Symphoricarpos occidentalis | (R.Br.) Hook. | Caprifoliaceae | 8 |
| Symphoricarpos orbiculatus | Moench | Caprifoliaceae | 8 |
| Symphyotrichum boreale | (Torr. & A.Gray) Á.Löve & D.Löve | Asteraceae | 8 |
| Symphyotrichum ciliatum | (Ledeb.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum cordifolium | (L.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum drummondii | (Lindl.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum dumosum | (L.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum ericoides | (L.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum falcatum | (Lindl.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum laeve | (L.) Á.Löve & D.Löve | Asteraceae | 8 |
| Symphyotrichum lanceolatum | (Willd.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum novae-angliae | (L.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum oblongifolium | (Nutt.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum ontarionis | (Wiegand) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum pilosum | (Willd.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum praealtum | (Poir.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum prenanthoides | (Muhl. ex Willd.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum racemosum | (Elliott) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum robynsianum | (J.Rousseau) Brouillet & Labrecque | Asteraceae | 8 |
| Symphyotrichum sericeum | (Vent.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum shortii | (Lindl.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum urophyllum | (Lindl.) G.L.Nesom | Asteraceae | 8 |
| Symplocarpus foetidus | (L.) Salisb. ex W.P.C.Barton | Araceae | 8 |
| Taenidia integerrima | (L.) Drude | Apiaceae | 8 |
| Tanacetum bipinnatum | Sch.Bip. | Asteraceae | 8 |
| Taxus canadensis | Marshall | Taxaceae | 8 |
| Tephroseris palustris | Fourr. | Asteraceae | 8 |
| Tephrosia virginiana | (L.) Pers. | Fabaceae | 8 |
| Teucrium canadense | L. | Lamiaceae | 8 |
| Thacla natans | (Pall.) Deyl & Soják | Ranunculaceae | 8 |
| Thalictrum dasycarpum | Fisch., C.A.Mey. & Avé-Lall. | Ranunculaceae | 8 |
| Thalictrum dioicum | L. | Ranunculaceae | 8 |
| Thalictrum revolutum | DC. | Ranunculaceae | 8 |
| Thalictrum venulosum | Trel. | Ranunculaceae | 8 |
| Thaspium chapmanii | (J.M.Coult. & Rose) Small | Apiaceae | 8 |
| Thaspium trifoliatum | (L.) A.Gray | Apiaceae | 8 |
| Thelypteris palustris | Schott | Thelypteridaceae | 8 |
| Thuja occidentalis | L. | Cupressaceae | 8 |
| Tiarella stolonifera | G.L.Nesom | Saxifragaceae | 8 |
| Tilia americana | L. | Malvaceae | 8 |
| Tomostima reptans | (Lam.) Al-Shehbaz, M.Koch & Jordon-Thaden | Brassicaceae | 8 |
| Toxicodendron radicans | (L.) Kuntze | Anacardiaceae | 8 |
| Toxicodendron vernix | Kuntze | Anacardiaceae | 8 |
| Tradescantia bracteata | Small | Commelinaceae | 8 |
| Tradescantia occidentalis | (Britton) Smyth | Commelinaceae | 8 |
| Tradescantia ohiensis | Raf. | Commelinaceae | 8 |
| Tradescantia virginiana | L. | Commelinaceae | 8 |
| Triantha glutinosa | (Michx.) Baker | Tofieldiaceae | 8 |
| Trichogalium boreale | (L.) Fourr. | Rubiaceae | 8 |
| Trichogalium circaezans | (Michx.) Kadereit & Schneew. | Rubiaceae | 8 |
| Trichogalium lanceolatum | (Torr. & A.Gray) Kadereit & Schneew. | Rubiaceae | 8 |
| Trichophorum alpinum | (L.) Pers. | Cyperaceae | 8 |
| Trichophorum cespitosum | (L.) Hartm. | Cyperaceae | 8 |
| Tridens flavus | (L.) Hitchc. | Poaceae | 8 |
| Triglochin maritima | L. | Juncaginaceae | 8 |
| Triglochin palustris | L. | Juncaginaceae | 8 |
| Trillium cernuum | L. | Melanthiaceae | 8 |
| Trillium flexipes | Raf. | Melanthiaceae | 8 |
| Trillium grandiflorum | (Michx.) Salisb. | Melanthiaceae | 8 |
| Trillium nivale | Riddell | Melanthiaceae | 8 |
| Trillium recurvatum | L.C.Beck | Melanthiaceae | 8 |
| Triodanis perfoliata | (L.) Nieuwl. | Campanulaceae | 8 |
| Triosteum aurantiacum | E.P.Bicknell | Caprifoliaceae | 8 |
| Triosteum perfoliatum | L. | Caprifoliaceae | 8 |
| Triphora trianthophoros | (Sw.) Rydb. | Orchidaceae | 8 |
| Triplasis purpurea | (Walter) Chapm. | Poaceae | 8 |
| Tsuga canadensis | (L.) Carrière | Pinaceae | 8 |
| Turritis glabra | L. | Brassicaceae | 8 |
| Typha angustifolia | L. | Typhaceae | 8 |
| Typha latifolia | L. | Typhaceae | 8 |
| Ulmus americana | L. | Ulmaceae | 8 |
| Ulmus rubra | Muhl. | Ulmaceae | 8 |
| Ulmus thomasii | Sarg. | Ulmaceae | 8 |
| Urtica gracilis | Aiton | Urticaceae | 8 |
| Utricularia cornuta | Michx. | Lentibulariaceae | 8 |
| Utricularia geminiscapa | Benj. | Lentibulariaceae | 8 |
| Utricularia gibba | L. | Lentibulariaceae | 8 |
| Utricularia intermedia | Hayne | Lentibulariaceae | 8 |
| Utricularia macrorhiza | Leconte | Lentibulariaceae | 8 |
| Utricularia minor | L. | Lentibulariaceae | 8 |
| Utricularia purpurea | Walter | Lentibulariaceae | 8 |
| Utricularia resupinata | B.D.Greene ex Bigelow | Lentibulariaceae | 8 |
| Uvularia grandiflora | Sm. | Colchicaceae | 8 |
| Uvularia sessilifolia | L. | Colchicaceae | 8 |
| Vaccinium angustifolium | Aiton | Ericaceae | 8 |
| Vaccinium cespitosum | Michx. | Ericaceae | 8 |
| Vaccinium macrocarpon | Aiton | Ericaceae | 8 |
| Vaccinium myrtilloides | Michx. | Ericaceae | 8 |
| Vaccinium oxycoccos | L. | Ericaceae | 8 |
| Vaccinium pallidum | Aiton | Ericaceae | 8 |
| Vaccinium vitis-idaea | L. | Ericaceae | 8 |
| Valeriana edulis | Nutt. | Caprifoliaceae | 8 |
| Valeriana uliginosa | (Torr. & A.Gray) Rydb. | Caprifoliaceae | 8 |
| Vallisneria americana | Michx. | Hydrocharitaceae | 8 |
| Verbena bracteata | Cav. ex Lag. & Rodr. | Verbenaceae | 8 |
| Verbena canadensis | (L.) Britton | Verbenaceae | 8 |
| Verbena hastata | L. | Verbenaceae | 8 |
| Verbena simplex | Lehm. | Verbenaceae | 8 |
| Verbena stricta | Vent. | Verbenaceae | 8 |
| Verbena urticifolia | L. | Verbenaceae | 8 |
| Verbesina alternifolia | (L.) Britton ex Kearney | Asteraceae | 8 |
| Vernonia fasciculata | Michx. | Asteraceae | 8 |
| Veronica americana | (Raf.) Schwein. ex Benth. | Plantaginaceae | 8 |
| Veronica bullii | (Eaton) M.M.Mart.Ort. & Albach | Plantaginaceae | 8 |
| Veronica catenata | Pennell | Plantaginaceae | 8 |
| Veronica peregrina | L. | Plantaginaceae | 8 |
| Veronica scutellata | L. | Plantaginaceae | 8 |
| Veronica serpyllifolia | L. | Plantaginaceae | 8 |
| Veronicastrum virginicum | (L.) Farw. | Plantaginaceae | 8 |
| Viburnum acerifolium | L. | Viburnaceae | 8 |
| Viburnum cassinoides | L. | Viburnaceae | 8 |
| Viburnum edule | (Michx.) Raf. | Viburnaceae | 8 |
| Viburnum lentago | L. | Viburnaceae | 8 |
| Viburnum opulus | L. | Viburnaceae | 8 |
| Viburnum prunifolium | L. | Viburnaceae | 8 |
| Viburnum rafinesqueanum | Schult. | Viburnaceae | 8 |
| Viburnum recognitum | Fernald | Viburnaceae | 8 |
| Vicia americana | Muhl. ex Willd. | Fabaceae | 8 |
| Vicia caroliniana | Walter | Fabaceae | 8 |
| Viola adunca | Sm. | Violaceae | 8 |
| Viola affinis | Leconte | Violaceae | 8 |
| Viola blanda | Willd. | Violaceae | 8 |
| Viola canadensis | L. | Violaceae | 8 |
| Viola cucullata | Aiton | Violaceae | 8 |
| Viola labradorica | Schrank | Violaceae | 8 |
| Viola lanceolata | L. | Violaceae | 8 |
| Viola macloskeyi | F.E.Lloyd | Violaceae | 8 |
| Viola missouriensis | Greene | Violaceae | 8 |
| Viola nephrophylla | Greene | Violaceae | 8 |
| Viola pedata | L. | Violaceae | 8 |
| Viola pedatifida | G.Don | Violaceae | 8 |
| Viola primulifolia | L. | Violaceae | 8 |
| Viola pubescens | Aiton | Violaceae | 8 |
| Viola renifolia | A.Gray | Violaceae | 8 |
| Viola rostrata | Pursh | Violaceae | 8 |
| Viola sagittata | Aiton | Violaceae | 8 |
| Viola selkirkii | Pursh ex Goldie | Violaceae | 8 |
| Viola sororia | Willd. | Violaceae | 8 |
| Viola striata | Aiton | Violaceae | 8 |
| Vitis aestivalis | Michx. | Vitaceae | 8 |
| Vitis labrusca | L. | Vitaceae | 8 |
| Vitis riparia | Michx. | Vitaceae | 8 |
| Waldsteinia fragarioides | (Michx.) Tratt. | Rosaceae | 8 |
| Wolffia borealis | (Engelm.) Landolt | Araceae | 8 |
| Wolffia brasiliensis | Wedd. | Araceae | 8 |
| Wolffia columbiana | H.Karst. | Araceae | 8 |
| Woodsia ilvensis | (L.) R.Br. | Woodsiaceae | 8 |
| Woodsia obtusa | (Sw.) Torr. | Woodsiaceae | 8 |
| Woodsia oregana | D.C.Eaton | Woodsiaceae | 8 |
| Xanthium orientale | L. | Asteraceae | 8 |
| Xanthium strumarium | L. | Asteraceae | 8 |
| Xyris difformis | Chapm. | Xyridaceae | 8 |
| Xyris montana | Ries | Xyridaceae | 8 |
| Xyris torta | Sm. | Xyridaceae | 8 |
| Yucca flaccida | Haw. | Asparagaceae | 8 |
| Zannichellia palustris | L. | Potamogetonaceae | 8 |
| Zanthoxylum americanum | Mill. | Rutaceae | 8 |
| Zizania aquatica | L. | Poaceae | 8 |
| Zizania palustris | L. | Poaceae | 8 |
| Zizia aptera | (A.Gray) Fernald | Apiaceae | 8 |
| Botrychium pallidum | W.H.Wagner | Ophioglossaceae | 7 |
| Carex backii | Boott | Cyperaceae | 7 |
| Carex merritt-fernaldii | Mack. | Cyperaceae | 7 |
| Corispermum americanum | (Nutt.) Nutt. | Chenopodiaceae | 7 |
| Crataegus jonesiae | Sarg. | Rosaceae | 7 |
| Didiplis diandra | (Nutt. ex DC.) Alph.Wood | Lythraceae | 7 |
| Festuca saximontana | Rydb. | Poaceae | 7 |
| Isoetes lacustris | L. | Isoetaceae | 7 |
| Neottia auriculata | (Wiegand) Szlach. | Orchidaceae | 7 |
| Scirpus pallidus | (Britton) Fernald | Cyperaceae | 7 |
| Aristida basiramea | Vasey | Poaceae | 6 |
| Bacopa rotundifolia | (Michx.) Wettst. | Plantaginaceae | 6 |
| Carex conoidea | Willd. | Cyperaceae | 6 |
| Eleocharis intermedia | Schult. | Cyperaceae | 6 |
| Eragrostis capillaris | (L.) Nees | Poaceae | 6 |
| Juncus brachycephalus | (Engelm.) Buchenau | Juncaceae | 6 |
| Muhlenbergia sobolifera | (Muhl. ex Willd.) Trin. | Poaceae | 6 |
| Polygonum careyi | Olney | Polygonaceae | 6 |
| Polygonum ramosissimum | Michx. | Polygonaceae | 6 |
| Sparganium androcladum | (Engelm.) Morong | Typhaceae | 6 |
| Asclepias lanuginosa | Nutt. | Apocynaceae | 5 |
| Carex oederi | Retz. | Cyperaceae | 5 |
| Carex ormostachya | Wiegand | Cyperaceae | 5 |
| Eleocharis flavescens | (Poir.) Urb. | Cyperaceae | 5 |
| Juncus greenei | Oakes & Tuck. | Juncaceae | 5 |
| Juncus vaseyi | Engelm. | Juncaceae | 5 |
| Myriophyllum tenellum | Bigelow | Haloragaceae | 5 |
| Panicum philadelphicum | Bernh. ex Nees | Poaceae | 5 |
| Poa wolfii | Scribn. | Poaceae | 5 |
| Potamogeton confervoides | Rchb. | Potamogetonaceae | 5 |
| Rhynchospora scirpoides | (Torr.) Griseb. | Cyperaceae | 5 |
| Silene nivea | (Nutt.) Muhl. ex DC. | Caryophyllaceae | 5 |
| Carex laeviconica | Dewey | Cyperaceae | 4 |
| Carex oligocarpa | Willd. | Cyperaceae | 4 |
| Carex torreyi | Tuck. | Cyperaceae | 4 |
| Cyperus hemidrummondii | Goetgh. | Cyperaceae | 4 |
| Fuirena pumila | (Torr.) Spreng. | Cyperaceae | 4 |
| Lechea stricta | Legg. ex Britton | Cistaceae | 4 |
| Littorella americana | Fernald | Plantaginaceae | 4 |
| Ludwigia polycarpa | Short & R.Peter | Onagraceae | 4 |
| Potamogeton bicupulatus | Fernald | Potamogetonaceae | 4 |
| Potamogeton oakesianus | J.W.Robbins | Potamogetonaceae | 4 |
| Schoenoplectiella hallii | (A.Gray) Lye | Cyperaceae | 4 |
| Solidago mollis | Bartl. | Asteraceae | 4 |
| Spiranthes casei | Catling & Cruise | Orchidaceae | 4 |
| Trichophorum clintonii | (A.Gray) S.G.Sm. | Cyperaceae | 4 |
| Carex echinodes | (Fernald) P.Rothr., Reznicek & Hipp | Cyperaceae | 3 |
| Carex lupuliformis | Sartwell ex Dewey | Cyperaceae | 3 |
| Chenopodium desiccatum | A.Nelson | Chenopodiaceae | 3 |
| Erysimum inconspicuum | (S.Watson) MacMill. | Brassicaceae | 3 |
| Potamogeton pulcher | Tuck. | Potamogetonaceae | 3 |
| Pteridium latiusculum | Hieron. | Dennstaedtiaceae | 3 |
| Sparganium glomeratum | (Laest. ex Beurl.) Beurl. | Typhaceae | 3 |