| Abies balsamea | (L.) Mill. | Pinaceae | 8 |
| Acalypha gracilens | A.Gray | Euphorbiaceae | 8 |
| Acalypha rhomboidea | Raf. | Euphorbiaceae | 8 |
| Acalypha virginica | L. | 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 |
| Acorus calamus | L. | Acoraceae | 8 |
| Actaea pachypoda | Elliott | Ranunculaceae | 8 |
| Actaea racemosa | L. | Ranunculaceae | 8 |
| Actaea rubra | (Aiton) Willd. | Ranunculaceae | 8 |
| Adiantum pedatum | L. | Pteridaceae | 8 |
| Adlumia fungosa | (Aiton) Greene ex Britton, Sterns & Poggenb. | Papaveraceae | 8 |
| Agalinis decemloba | (Greene) Pennell | Orobanchaceae | 8 |
| Agalinis maritima | (Raf.) Raf. | Orobanchaceae | 8 |
| Agalinis purpurea | (L.) Pennell | Orobanchaceae | 8 |
| Agalinis tenuifolia | (Vahl) Raf. | Orobanchaceae | 8 |
| Agastache nepetoides | (L.) Kuntze | Lamiaceae | 8 |
| Agastache scrophulariifolia | (Willd.) Kuntze | Lamiaceae | 8 |
| Ageratina altissima | (L.) R.M.King & H.Rob. | Asteraceae | 8 |
| Ageratina aromatica | (L.) Spach | 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 subcordatum | Raf. | Alismataceae | 8 |
| Alisma triviale | Pursh | Alismataceae | 8 |
| Allium canadense | L. | Amaryllidaceae | 8 |
| Allium schoenoprasum | L. | Amaryllidaceae | 8 |
| Allium tricoccum | Aiton | Amaryllidaceae | 8 |
| Alnus incana | (L.) Moench | Betulaceae | 8 |
| Alnus serrulata | (Aiton) Willd. | Betulaceae | 8 |
| Alopecurus aequalis | Sobol. | Poaceae | 8 |
| Alopecurus carolinianus | Walter | Poaceae | 8 |
| Amaranthus pumilus | Raf. | Amaranthaceae | 8 |
| Amaranthus tuberculatus | (Moq.) J.D.Sauer | Amaranthaceae | 8 |
| Amauropelta noveboracensis | (L.) S.E.Fawc. & A.R.Sm. | Thelypteridaceae | 8 |
| Ambrosia artemisiifolia | L. | Asteraceae | 8 |
| Ambrosia bidentata | Michx. | Asteraceae | 8 |
| Ambrosia psilostachya | DC. | Asteraceae | 8 |
| Ambrosia trifida | L. | Asteraceae | 8 |
| Amelanchier arborea | (F.Michx.) Fernald | Rosaceae | 8 |
| Amelanchier canadensis | (L.) Medik. | Rosaceae | 8 |
| Amelanchier laevis | Wiegand | Rosaceae | 8 |
| Amelanchier nantucketensis | E.P.Bicknell | Rosaceae | 8 |
| Amelanchier sanguinea | (Pursh) DC. | Rosaceae | 8 |
| Amelanchier stolonifera | Wiegand | Rosaceae | 8 |
| Amphicarpaea bracteata | (L.) Fernald | Fabaceae | 8 |
| Anaphalis margaritacea | (L.) Benth. & Hook.f. | Asteraceae | 8 |
| Anchistea virginica | (L.) C.Presl | Blechnaceae | 8 |
| Andersonglossum boreale | (Fernald) Jim.Mejías, J.I.Cohen & Naczi | Boraginaceae | 8 |
| Andersonglossum virginianum | (L.) J.I.Cohen | Boraginaceae | 8 |
| Andromeda polifolia | L. | Ericaceae | 8 |
| Andropogon virginicus | L. | Poaceae | 8 |
| Anemonastrum canadense | (L.) Mosyakin | Ranunculaceae | 8 |
| Anemone cylindrica | A.Gray | Ranunculaceae | 8 |
| Anemone quinquefolia | L. | Ranunculaceae | 8 |
| Anemone virginiana | L. | Ranunculaceae | 8 |
| Anemonella thalictroides | Spach | Ranunculaceae | 8 |
| Angelica atropurpurea | L. | Apiaceae | 8 |
| Angelica lucida | L. | Apiaceae | 8 |
| Angelica venenosa | (J.Greenway) Fernald | 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 |
| 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 |
| Argentina pacifica | (Howell) Rydb. | Rosaceae | 8 |
| Arisaema dracontium | (L.) Schott | Araceae | 8 |
| Arisaema pusillum | (Peck) Nash | Araceae | 8 |
| Arisaema stewardsonii | Britton | Araceae | 8 |
| Arisaema triphyllum | (L.) Schott | Araceae | 8 |
| Aristida longespica | Poir. | Poaceae | 8 |
| Aristida oligantha | Michx. | Poaceae | 8 |
| Aristida purpurascens | Poir. | Poaceae | 8 |
| Aristida tuberculosa | Nutt. | Poaceae | 8 |
| Aristolochia serpentaria | L. | Aristolochiaceae | 8 |
| Aronia arbutifolia | (L.) Pers. | Rosaceae | 8 |
| Aronia melanocarpa | (Michx.) Elliott | Rosaceae | 8 |
| Artemisia campestris | L. | Asteraceae | 8 |
| Artemisia ludoviciana | Nutt. | Asteraceae | 8 |
| Artemisia stelleriana | Besser | Asteraceae | 8 |
| Asarum canadense | L. | Aristolochiaceae | 8 |
| Asarum reflexum | E.P.Bicknell | Aristolochiaceae | 8 |
| Asclepias amplexicaulis | Sm. | Apocynaceae | 8 |
| Asclepias exaltata | L. | Apocynaceae | 8 |
| Asclepias incarnata | L. | Apocynaceae | 8 |
| Asclepias purpurascens | L. | Apocynaceae | 8 |
| Asclepias quadrifolia | Jacq. | Apocynaceae | 8 |
| Asclepias syriaca | L. | Apocynaceae | 8 |
| Asclepias tuberosa | L. | Apocynaceae | 8 |
| Asclepias variegata | L. | Apocynaceae | 8 |
| Asclepias verticillata | L. | Apocynaceae | 8 |
| Asclepias viridiflora | Raf. | Apocynaceae | 8 |
| Asplenium montanum | Willd. | Aspleniaceae | 8 |
| Asplenium pinnatifidum | Nutt. | Aspleniaceae | 8 |
| Asplenium platyneuron | (L.) Britton, Sterns & Poggenb. | Aspleniaceae | 8 |
| Asplenium rhizophyllum | L. | Aspleniaceae | 8 |
| Asplenium ruta-muraria | L. | Aspleniaceae | 8 |
| Asplenium trichomanes | L. | Aspleniaceae | 8 |
| Aster subulatus | Michx. | Asteraceae | 8 |
| Astragalus canadensis | L. | Fabaceae | 8 |
| Athyrium angustum | (Willd.) C.Presl | Athyriaceae | 8 |
| Athyrium asplenioides | (Michx.) Desv. | Athyriaceae | 8 |
| Atriplex patula | L. | Chenopodiaceae | 8 |
| Atriplex prostrata | Boucher ex DC. | Chenopodiaceae | 8 |
| Aureolaria flava | (L.) Farw. | Orobanchaceae | 8 |
| Aureolaria pedicularia | (L.) Raf. ex Farw. | Orobanchaceae | 8 |
| Aureolaria virginica | (L.) Pennell | Orobanchaceae | 8 |
| Avenella flexuosa | (L.) Drejer | Poaceae | 8 |
| Azolla caroliniana | Willd. | Salviniaceae | 8 |
| Baccharis halimifolia | L. | Asteraceae | 8 |
| Baptisia australis | (L.) R.Br. | Fabaceae | 8 |
| Baptisia tinctoria | (L.) R.Br. | Fabaceae | 8 |
| Bartonia paniculata | (Michx.) Muhl. | Gentianaceae | 8 |
| Bartonia virginica | (L.) Britton, Sterns & Poggenb. | Gentianaceae | 8 |
| Betula alleghaniensis | Britton | Betulaceae | 8 |
| Betula lenta | L. | Betulaceae | 8 |
| Betula nigra | L. | Betulaceae | 8 |
| Betula papyrifera | Marshall | Betulaceae | 8 |
| Betula populifolia | Marshall | Betulaceae | 8 |
| Betula pumila | L. | Betulaceae | 8 |
| Bidens alba | DC. | Asteraceae | 8 |
| Bidens beckii | Torr. ex Spreng. | Asteraceae | 8 |
| Bidens bipinnata | L. | 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 laevis | (L.) Britton, Sterns & Poggenb. | 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 |
| Boehmeria cylindrica | (L.) Sw. | Urticaceae | 8 |
| Bolboschoenus fluviatilis | (Torr.) Soják | Cyperaceae | 8 |
| Bolboschoenus maritimus | (L.) Palla | Cyperaceae | 8 |
| Bolboschoenus robustus | (Pursh) Soják | Cyperaceae | 8 |
| Boltonia asteroides | L'Hér. | Asteraceae | 8 |
| Borodinia canadensis | (L.) 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 matricariifolium | (Retz.) A.Braun ex W.D.J.Koch | Ophioglossaceae | 8 |
| Botrychium simplex | E.Hitchc. | Ophioglossaceae | 8 |
| Botrychium tenebrosum | A.A.Eaton | Ophioglossaceae | 8 |
| Botrypus virginianus | (L.) Michx. | Ophioglossaceae | 8 |
| Bouteloua curtipendula | (Michx.) Torr. | 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 |
| Cabomba caroliniana | A.Gray | Cabombaceae | 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 |
| Callitriche heterophylla | Pursh | Plantaginaceae | 8 |
| Callitriche palustris | L. | Plantaginaceae | 8 |
| Callitriche terrestris | Raf. | Plantaginaceae | 8 |
| Calopogon tuberosus | (L.) Britton, Sterns & Poggenb. | Orchidaceae | 8 |
| Caltha palustris | L. | Ranunculaceae | 8 |
| Calystegia sepium | (L.) R.Br. | Convolvulaceae | 8 |
| Calystegia silvatica | Griseb. | Convolvulaceae | 8 |
| Calystegia spithamaea | (L.) Pursh | Convolvulaceae | 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 abscondita | Mack. | Cyperaceae | 8 |
| Carex albicans | Willd. ex Spreng. | Cyperaceae | 8 |
| Carex albolutescens | Schwein. | Cyperaceae | 8 |
| Carex albursina | E.Sheld. | Cyperaceae | 8 |
| Carex alopecoidea | Tuck. | Cyperaceae | 8 |
| Carex amphibola | Steud. | Cyperaceae | 8 |
| Carex annectens | (E.P.Bicknell) E.P.Bicknell | Cyperaceae | 8 |
| Carex aquatilis | Wahlenb. | Cyperaceae | 8 |
| Carex arctata | Boott | Cyperaceae | 8 |
| Carex atlantica | L.H.Bailey | Cyperaceae | 8 |
| Carex aurea | Nutt. | Cyperaceae | 8 |
| Carex barrattii | Torr. ex Schwein. | Cyperaceae | 8 |
| Carex bebbii | (L.H.Bailey) Olney ex Fernald | Cyperaceae | 8 |
| Carex bicknellii | Britton & A.Br. | Cyperaceae | 8 |
| Carex billingsii | (O.W.Knight) Kirschb. | 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 bullata | Willd. | Cyperaceae | 8 |
| Carex bushii | Mack. | Cyperaceae | 8 |
| Carex buxbaumii | Wahlenb. | Cyperaceae | 8 |
| Carex canescens | L. | Cyperaceae | 8 |
| Carex castanea | Wahlenb. | Cyperaceae | 8 |
| Carex cephaloidea | (Dewey) Dewey ex Boott | Cyperaceae | 8 |
| Carex cephalophora | Muhl. ex Willd. | Cyperaceae | 8 |
| Carex collinsii | Nutt. | Cyperaceae | 8 |
| Carex communis | L.H.Bailey | Cyperaceae | 8 |
| Carex comosa | Boott | 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 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 festucacea | Willd. | Cyperaceae | 8 |
| Carex flava | L. | Cyperaceae | 8 |
| Carex foenea | Willd. | Cyperaceae | 8 |
| Carex folliculata | L. | Cyperaceae | 8 |
| Carex glaucodea | Tuck. ex Olney | Cyperaceae | 8 |
| Carex gracilescens | Steud. | Cyperaceae | 8 |
| Carex gracillima | Schwein. | Cyperaceae | 8 |
| Carex granularis | Muhl. ex Willd. | Cyperaceae | 8 |
| Carex grayi | J.Carey | Cyperaceae | 8 |
| Carex grisea | Wahlenb. | Cyperaceae | 8 |
| Carex gynandra | Schwein. | Cyperaceae | 8 |
| Carex hirsutella | Mack. | Cyperaceae | 8 |
| Carex hirtifolia | Mack. | Cyperaceae | 8 |
| Carex hitchcockiana | Dewey | Cyperaceae | 8 |
| Carex hormathodes | Fernald | Cyperaceae | 8 |
| Carex hystericina | Muhl. ex Willd. | Cyperaceae | 8 |
| Carex interior | L.H.Bailey | Cyperaceae | 8 |
| Carex intumescens | Rudge | 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 leptalea | Wahlenb. | Cyperaceae | 8 |
| Carex leptonervia | (Fernald) Fernald | Cyperaceae | 8 |
| Carex limosa | L. | 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 molesta | Mack. | Cyperaceae | 8 |
| Carex muehlenbergii | Schkuhr ex Willd. | Cyperaceae | 8 |
| Carex nigra | (L.) Reichard | Cyperaceae | 8 |
| Carex nigromarginata | Schwein. | Cyperaceae | 8 |
| Carex normalis | Mack. | Cyperaceae | 8 |
| Carex novae-angliae | Schwein. | Cyperaceae | 8 |
| Carex pallescens | L. | Cyperaceae | 8 |
| Carex pauciflora | Lightf. | 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 polymorpha | Muhl. | 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 retroflexa | Muhl. ex Willd. | Cyperaceae | 8 |
| Carex retrorsa | Schwein. | Cyperaceae | 8 |
| Carex rosea | Willd. | Cyperaceae | 8 |
| Carex scabrata | Schwein. | Cyperaceae | 8 |
| Carex scoparia | Schkuhr ex Willd. | Cyperaceae | 8 |
| Carex siccata | Dewey | Cyperaceae | 8 |
| Carex silicea | Olney | Cyperaceae | 8 |
| Carex sparganioides | Muhl. ex Willd. | Cyperaceae | 8 |
| Carex sprengelii | Dewey ex Spreng. | Cyperaceae | 8 |
| Carex squarrosa | L. | Cyperaceae | 8 |
| Carex sterilis | Willd. | Cyperaceae | 8 |
| Carex stipata | Muhl. ex Willd. | Cyperaceae | 8 |
| Carex striatula | Michx. | Cyperaceae | 8 |
| Carex stricta | Lam. | Cyperaceae | 8 |
| Carex styloflexa | Buckley | Cyperaceae | 8 |
| Carex swanii | (Fernald) Mack. | Cyperaceae | 8 |
| Carex tenera | Dewey | Cyperaceae | 8 |
| Carex tetanica | Schkuhr | Cyperaceae | 8 |
| Carex tincta | (Fernald) Fernald | Cyperaceae | 8 |
| Carex tonsa | (Fernald) E.P.Bicknell | Cyperaceae | 8 |
| Carex torta | Boott ex Tuck. | 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 utriculata | Boott | Cyperaceae | 8 |
| Carex vesicaria | L. | Cyperaceae | 8 |
| Carex vestita | Willd. | Cyperaceae | 8 |
| Carex virescens | Muhl. ex Willd. | Cyperaceae | 8 |
| Carex vulpinoidea | Michx. | Cyperaceae | 8 |
| Carex willdenowii | Willd. | 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 |
| Carya tomentosa | (Lam.) Nutt. | Juglandaceae | 8 |
| Castanea dentata | Borkh. | Fagaceae | 8 |
| Castilleja coccinea | (L.) Spreng. | Orobanchaceae | 8 |
| Catalpa speciosa | (Warder) Engelm. | Bignoniaceae | 8 |
| Caulophyllum thalictroides | (L.) Michx. | Berberidaceae | 8 |
| Ceanothus americanus | L. | Rhamnaceae | 8 |
| Celastrus scandens | L. | Celastraceae | 8 |
| Celtis occidentalis | L. | Cannabaceae | 8 |
| Cephalanthus occidentalis | L. | Rubiaceae | 8 |
| Cerastium nutans | Raf. | Caryophyllaceae | 8 |
| Ceratophyllum demersum | L. | Ceratophyllaceae | 8 |
| Ceratophyllum echinatum | A.Gray | Ceratophyllaceae | 8 |
| Cercis canadensis | L. | Fabaceae | 8 |
| Chamaecrista fasciculata | (Michx.) Greene | Fabaceae | 8 |
| Chamaecyparis thyoides | (L.) Britton, Sterns & Poggenb. | Cupressaceae | 8 |
| Chamaedaphne calyculata | (L.) Moench | Ericaceae | 8 |
| Chamaelirium luteum | (L.) A.Gray | Melanthiaceae | 8 |
| Chelone glabra | L. | Plantaginaceae | 8 |
| Chenopodium album | L. | Chenopodiaceae | 8 |
| Chenopodium berlandieri | Moq. | Chenopodiaceae | 8 |
| Chenopodium rubrum | L. | Chenopodiaceae | 8 |
| Chimaphila maculata | (L.) Pursh | Ericaceae | 8 |
| Chimaphila umbellata | (L.) W.P.C.Barton | Ericaceae | 8 |
| Chloris verticillata | Nutt. | Poaceae | 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 discolor | (Muhl. ex Willd.) Spreng. | Asteraceae | 8 |
| Cirsium horridulum | Michx. | Asteraceae | 8 |
| Cirsium muticum | Michx. | Asteraceae | 8 |
| Cirsium pumilum | 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 |
| Clethra alnifolia | L. | Clethraceae | 8 |
| Clintonia borealis | (Aiton) Raf. | Liliaceae | 8 |
| Coleataenia longifolia | (Torr.) Soreng | Poaceae | 8 |
| Coleataenia rigidula | (Bosc ex Nees) LeBlond | Poaceae | 8 |
| Collinsonia canadensis | L. | Lamiaceae | 8 |
| Collomia linearis | Nutt. | Polemoniaceae | 8 |
| Comandra umbellata | (L.) Nutt. | Santalaceae | 8 |
| Comarum palustre | L. | Rosaceae | 8 |
| Comptonia peregrina | (L.) Coult. | Myricaceae | 8 |
| Conioselinum chinense | (L.) Britton, Sterns & Poggenb. | Apiaceae | 8 |
| Conopholis americana | (L.) Wallr. | Orobanchaceae | 8 |
| Coptis trifolia | (L.) Salisb. | Ranunculaceae | 8 |
| Corallorhiza maculata | Raf. | Orchidaceae | 8 |
| Corallorhiza odontorhiza | (Willd.) Nutt. | Orchidaceae | 8 |
| Corallorhiza trifida | Châtel. | Orchidaceae | 8 |
| Coreopsis grandiflora | Hogg ex Sweet | Asteraceae | 8 |
| Coreopsis pubescens | Elliott | Asteraceae | 8 |
| Coreopsis tinctoria | Nutt. | Asteraceae | 8 |
| Coreopsis tripteris | L. | Asteraceae | 8 |
| Cornus alternifolia | L.f. | Cornaceae | 8 |
| Cornus amomum | Mill. | Cornaceae | 8 |
| Cornus canadensis | L. | Cornaceae | 8 |
| Cornus florida | L. | Cornaceae | 8 |
| Cornus obliqua | Raf. | Cornaceae | 8 |
| Cornus racemosa | Lam. | Cornaceae | 8 |
| Cornus rugosa | Lam. | Cornaceae | 8 |
| Cornus sericea | L. | Cornaceae | 8 |
| Corylus americana | Walter | Betulaceae | 8 |
| Corylus cornuta | Marshall | Betulaceae | 8 |
| Coryphopteris simulata | (Davenp.) S.E.Fawc. | Thelypteridaceae | 8 |
| Crataegus chrysocarpa | Ashe | Rosaceae | 8 |
| Crataegus coccinea | L. | Rosaceae | 8 |
| Crataegus crus-galli | L. | Rosaceae | 8 |
| Crataegus flabellata | (Bosc ex Spach) K.Koch | Rosaceae | 8 |
| Crataegus fluviatilis | Sarg. | Rosaceae | 8 |
| Crataegus fretalis | Sarg. | Rosaceae | 8 |
| Crataegus holmesiana | Ashe | Rosaceae | 8 |
| Crataegus intricata | Lange | Rosaceae | 8 |
| Crataegus iracunda | Beadle | Rosaceae | 8 |
| Crataegus irrasa | Sarg. | Rosaceae | 8 |
| Crataegus macracantha | (Lindl.) Lodd. ex Loudon | Rosaceae | 8 |
| Crataegus macrosperma | Ashe | 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 suborbiculata | Sarg. | Rosaceae | 8 |
| Crepidomanes intricatum | (Farrar) Ebihara & Weakley | Hymenophyllaceae | 8 |
| Crocanthemum bicknellii | (Fernald) Janch. | Cistaceae | 8 |
| Crocanthemum canadense | (L.) Britton | Cistaceae | 8 |
| Crotalaria sagittalis | L. | Fabaceae | 8 |
| Croton michauxii | G.L.Webster | Euphorbiaceae | 8 |
| Cryptogramma stelleri | (S.G.Gmel.) Prantl | Pteridaceae | 8 |
| Cryptotaenia canadensis | (L.) DC. | Apiaceae | 8 |
| Cuphea viscosissima | Jacq. | Lythraceae | 8 |
| Cuscuta cephalanthi | Engelm. | Convolvulaceae | 8 |
| Cuscuta compacta | Juss. ex Choisy | Convolvulaceae | 8 |
| Cuscuta coryli | Engelm. | Convolvulaceae | 8 |
| Cuscuta gronovii | Willd. | Convolvulaceae | 8 |
| Cuscuta indecora | Choisy | Convolvulaceae | 8 |
| Cuscuta pentagona | Engelm. | Convolvulaceae | 8 |
| Cyperus bipartitus | Torr. | Cyperaceae | 8 |
| Cyperus dentatus | Torr. | Cyperaceae | 8 |
| Cyperus diandrus | Torr. | Cyperaceae | 8 |
| Cyperus esculentus | L. | Cyperaceae | 8 |
| Cyperus filicinus | Vahl | Cyperaceae | 8 |
| Cyperus grayi | Torr. | Cyperaceae | 8 |
| Cyperus lupulinus | (Biehler) Marcks | Cyperaceae | 8 |
| Cyperus odoratus | L. | 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 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 tenuis | (Michx.) Desv. | Cystopteridaceae | 8 |
| Dactylorhiza viridis | (L.) R.M.Bateman, Pridgeon & M.W.Chase | Orchidaceae | 8 |
| Danthonia compressa | Austin | Poaceae | 8 |
| Danthonia spicata | (L.) Roem. & Schult. | Poaceae | 8 |
| Dasiphora fruticosa | (L.) Rydb. | Rosaceae | 8 |
| Decodon verticillatus | (L.) Elliott | Lythraceae | 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 |
| Desmodium canescens | (L.) DC. | Fabaceae | 8 |
| Desmodium marilandicum | (L.) DC. | Fabaceae | 8 |
| Dicentra canadensis | (Goldie) Walp. | Papaveraceae | 8 |
| Dicentra cucullaria | (L.) Bernh. | Papaveraceae | 8 |
| Dichanthelium acuminatum | (Sw.) Gould & C.A.Clark | Poaceae | 8 |
| Dichanthelium boscii | (Poir.) Gould & C.A.Clark | Poaceae | 8 |
| Dichanthelium clandestinum | (L.) Gould | Poaceae | 8 |
| Dichanthelium commutatum | (Schult.) Gould | 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 lindheimeri | (Nash) Gould | Poaceae | 8 |
| Dichanthelium linearifolium | (Scribn.) Gould | Poaceae | 8 |
| Dichanthelium microcarpon | (Muhl. ex Elliott) Mohlenbr. | Poaceae | 8 |
| Dichanthelium ovale | (Elliott) Gould & C.A.Clark | Poaceae | 8 |
| Dichanthelium polyanthes | (Schult.) Mohlenbr. | Poaceae | 8 |
| Dichanthelium portoricense | (Desv.) B.F.Hansen & Wunderlin | Poaceae | 8 |
| Dichanthelium scabriusculum | (Elliott) Gould & C.A.Clark | Poaceae | 8 |
| Dichanthelium scoparium | (Lam.) Gould | Poaceae | 8 |
| Dichanthelium sphaerocarpon | (Elliott) Gould | Poaceae | 8 |
| Dichanthelium xanthophysum | (A.Gray) Freckmann | Poaceae | 8 |
| Diervilla lonicera | Mill. | Caprifoliaceae | 8 |
| Digitaria cognata | (Schult.) Pilg. | Poaceae | 8 |
| Digitaria filiformis | (L.) Koeler | Poaceae | 8 |
| Diodia virginiana | L. | Rubiaceae | 8 |
| Dioscorea villosa | L. | Dioscoreaceae | 8 |
| Diospyros virginiana | L. | Ebenaceae | 8 |
| Diphasiastrum digitatum | (Dill. ex A.Braun) Holub | Lycopodiaceae | 8 |
| Diphasiastrum tristachyum | (Pursh) Holub | Lycopodiaceae | 8 |
| Diplachne fusca | (L.) P.Beauv. | Poaceae | 8 |
| Diplaziopsis pycnocarpa | (Spreng.) M.G.Price | Diplaziopsidaceae | 8 |
| Dirca palustris | L. | Thymelaeaceae | 8 |
| Distichlis spicata | (L.) Greene | Poaceae | 8 |
| Doellingeria infirma | (Michx.) Greene | Asteraceae | 8 |
| Doellingeria umbellata | (Mill.) Nees | Asteraceae | 8 |
| Dracocephalum parviflorum | Nutt. | Lamiaceae | 8 |
| Drosera intermedia | Hayne | Droseraceae | 8 |
| Drosera rotundifolia | L. | Droseraceae | 8 |
| Dryopteris campyloptera | Clarkson | Dryopteridaceae | 8 |
| Dryopteris carthusiana | (Vill.) H.P.Fuchs | Dryopteridaceae | 8 |
| Dryopteris cristata | (L.) A.Gray | 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 |
| Echinacea pallida | (Nutt.) Nutt. | Asteraceae | 8 |
| Echinochloa muricata | (P.Beauv.) Fernald | Poaceae | 8 |
| Echinochloa walteri | (Pursh) A.Heller | Poaceae | 8 |
| Echinocystis lobata | (Michx.) Torr. & A.Gray | Cucurbitaceae | 8 |
| Eclipta prostrata | (L.) L. | Asteraceae | 8 |
| Elatine americana | (Pursh) Arn. | Elatinaceae | 8 |
| Eleocharis acicularis | (L.) Roem. & Schult. | Cyperaceae | 8 |
| Eleocharis diandra | S.H.Wright | Cyperaceae | 8 |
| Eleocharis elliptica | Kunth | Cyperaceae | 8 |
| Eleocharis engelmannii | Steud. | Cyperaceae | 8 |
| Eleocharis equisetoides | (Elliott) Torr. | Cyperaceae | 8 |
| Eleocharis erythropoda | Steud. | 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 robbinsii | Oakes | Cyperaceae | 8 |
| Eleocharis rostellata | (Torr.) Torr. | Cyperaceae | 8 |
| Eleocharis tuberculosa | (Michx.) Roem. & Schult. | Cyperaceae | 8 |
| Ellisia nyctelea | (L.) L. | Hydrophyllaceae | 8 |
| Elodea canadensis | Michx. | Hydrocharitaceae | 8 |
| Elodea nuttallii | (Planch.) H.St.John | Hydrocharitaceae | 8 |
| Elymus canadensis | L. | Poaceae | 8 |
| Elymus hystrix | L. | Poaceae | 8 |
| Elymus macgregorii | R.E.Brooks & J.J.N.Campb. | Poaceae | 8 |
| Elymus riparius | Wiegand | Poaceae | 8 |
| Elymus villosus | Muhl. ex Willd. | Poaceae | 8 |
| Elymus violaceus | (Hornem.) J.Feilberg | Poaceae | 8 |
| Elymus virginicus | L. | Poaceae | 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 |
| Erechtites hieraciifolius | (L.) Raf. ex DC. | Asteraceae | 8 |
| Erigeron annuus | (L.) Desf. | Asteraceae | 8 |
| Erigeron canadensis | L. | 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 |
| Eriocaulon parkeri | B.L.Rob. | Eriocaulaceae | 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 |
| Erythranthe moschata | (Douglas ex Lindl.) G.L.Nesom | Phrymaceae | 8 |
| Erythronium americanum | Ker Gawl. | Liliaceae | 8 |
| Euonymus atropurpureus | Jacq. | Celastraceae | 8 |
| Eupatorium altissimum | L. | Asteraceae | 8 |
| Eupatorium capillifolium | (Lam.) Small ex Porter & Britton | Asteraceae | 8 |
| Eupatorium hyssopifolium | L. | Asteraceae | 8 |
| Eupatorium perfoliatum | L. | Asteraceae | 8 |
| Eupatorium pilosum | Walter | Asteraceae | 8 |
| Eupatorium rotundifolium | L. | Asteraceae | 8 |
| Eupatorium serotinum | Michx. | Asteraceae | 8 |
| Eupatorium sessilifolium | L. | Asteraceae | 8 |
| Euphorbia corollata | L. | Euphorbiaceae | 8 |
| Euphorbia glyptosperma | Engelm. | Euphorbiaceae | 8 |
| Euphorbia ipecacuanhae | L. | Euphorbiaceae | 8 |
| Euphorbia maculata | L. | Euphorbiaceae | 8 |
| Euphorbia nutans | Lag. | Euphorbiaceae | 8 |
| Euphorbia polygonifolia | L. | Euphorbiaceae | 8 |
| Euphorbia vermiculata | Raf. | Euphorbiaceae | 8 |
| Eurybia divaricata | (L.) G.L.Nesom | Asteraceae | 8 |
| Eurybia macrophylla | (L.) Cass. | Asteraceae | 8 |
| Eurybia radula | (Aiton) G.L.Nesom | Asteraceae | 8 |
| Eurybia schreberi | (Nees) Nees | Asteraceae | 8 |
| Eurybia spectabilis | (Aiton) G.L.Nesom | Asteraceae | 8 |
| Eurybia surculosa | (Michx.) G.L.Nesom | Asteraceae | 8 |
| Euthamia caroliniana | (L.) Greene ex Porter & Britton | Asteraceae | 8 |
| Euthamia weakleyi | G.L.Nesom | Asteraceae | 8 |
| Eutrochium dubium | (Willd. ex Poir.) E.E.Lamont | Asteraceae | 8 |
| Eutrochium fistulosum | (Barratt) E.E.Lamont | 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 octoflora | Walter | Poaceae | 8 |
| Festuca rubra | L. | Poaceae | 8 |
| Festuca subverticillata | (Pers.) E.B.Alexeev | Poaceae | 8 |
| Fimbristylis autumnalis | (L.) Roem. & Schult. | Cyperaceae | 8 |
| Floerkea proserpinacoides | Willd. | Limnanthaceae | 8 |
| Fragaria vesca | L. | Rosaceae | 8 |
| Fragaria virginiana | Mill. | Rosaceae | 8 |
| Fraxinus americana | L. | Oleaceae | 8 |
| Fraxinus nigra | Marshall | Oleaceae | 8 |
| Fraxinus pennsylvanica | Marshall | Oleaceae | 8 |
| Fuirena squarrosa | Michx. | Cyperaceae | 8 |
| Gaillardia aristata | Pursh | Asteraceae | 8 |
| Galearis spectabilis | (L.) Raf. | Orchidaceae | 8 |
| Galium obtusum | Bigelow | Rubiaceae | 8 |
| Galium pilosum | Aiton | Rubiaceae | 8 |
| Galium trifidum | L. | Rubiaceae | 8 |
| Galium triflorum | Michx. | Rubiaceae | 8 |
| Gamochaeta purpurea | (L.) Cabrera | Asteraceae | 8 |
| Gaultheria hispidula | (L.) Muhl. ex Bigelow | Ericaceae | 8 |
| Gaultheria procumbens | L. | Ericaceae | 8 |
| Gaylussacia baccata | (Wangenh.) K.Koch | Ericaceae | 8 |
| Gaylussacia bigeloviana | (Fernald) Sorrie & Weakley | Ericaceae | 8 |
| Gaylussacia frondosa | (L.) Torr. & A.Gray | Ericaceae | 8 |
| Gentiana andrewsii | Griseb. | Gentianaceae | 8 |
| Gentiana clausa | Raf. | Gentianaceae | 8 |
| Gentianella quinquefolia | (L.) Small | Gentianaceae | 8 |
| Gentianopsis crinita | (Froel.) Ma | Gentianaceae | 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 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 melicaria | (Michx.) F.T.Hubb. | Poaceae | 8 |
| Glyceria obtusa | (Muhl.) Trin. | Poaceae | 8 |
| Glyceria septentrionalis | Hitchc. | Poaceae | 8 |
| Glyceria striata | (Lam.) Hitchc. | Poaceae | 8 |
| Glycyrrhiza lepidota | Pursh | Fabaceae | 8 |
| Gnaphalium uliginosum | L. | Asteraceae | 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 |
| Greeneochloa coarctata | (Eaton) P.M.Peterson, Soreng, Romasch. & Barberá | Poaceae | 8 |
| Grindelia squarrosa | (Pursh) Dunal | Asteraceae | 8 |
| Gymnocarpium dryopteris | (L.) Newman | Cystopteridaceae | 8 |
| Gymnocladus dioicus | (L.) K.Koch | Fabaceae | 8 |
| Hackelia virginiana | (L.) I.M.Johnst. | Boraginaceae | 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 |
| Helianthus debilis | Nutt. | 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 microcephalus | Torr. & A.Gray | Asteraceae | 8 |
| Helianthus mollis | Lam. | 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 |
| Heteranthera dubia | (Jacq.) MacMill. | Pontederiaceae | 8 |
| Heteranthera reniformis | Ruiz & Pav. | Pontederiaceae | 8 |
| Heterotheca subaxillaris | (Lam.) Britton & Rusby | Asteraceae | 8 |
| Heuchera americana | L. | Saxifragaceae | 8 |
| Hexasepalum teres | (Walter) J.H.Kirkbr. | Rubiaceae | 8 |
| Hieracium gronovii | L. | Asteraceae | 8 |
| Hieracium lachenalii | Suter | Asteraceae | 8 |
| Hieracium paniculatum | L. | Asteraceae | 8 |
| Hieracium scabrum | Michx. | Asteraceae | 8 |
| Hieracium umbellatum | L. | Asteraceae | 8 |
| Hieracium venosum | L. | Asteraceae | 8 |
| Honckenya peploides | (L.) Ehrh. | Caryophyllaceae | 8 |
| Hottonia inflata | Elliott | Primulaceae | 8 |
| Houstonia caerulea | L. | Rubiaceae | 8 |
| Hudsonia ericoides | L. | Cistaceae | 8 |
| Hudsonia tomentosa | Nutt. | Cistaceae | 8 |
| Humulus americanus | Nutt. | Cannabaceae | 8 |
| Huperzia lucidula | (Michx.) Trevis. | Lycopodiaceae | 8 |
| Huperzia selago | (L.) Bernh. ex Schrank & Mart. | Lycopodiaceae | 8 |
| Hydrastis canadensis | L. | Ranunculaceae | 8 |
| Hydrocotyle americana | L. | Araliaceae | 8 |
| Hydrocotyle umbellata | L. | Araliaceae | 8 |
| Hydrocotyle verticillata | Thunb. | Araliaceae | 8 |
| Hydrogalium claytonii | (Michx.) Kadereit & Schneew. | Rubiaceae | 8 |
| Hydrogalium labradoricum | (Wiegand) Kadereit & Schneew. | Rubiaceae | 8 |
| Hydrogalium palustre | (L.) Kadereit & Schneew. | Rubiaceae | 8 |
| Hydrophyllum virginianum | L. | Hydrophyllaceae | 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 majus | (A.Gray) Britton | Hypericaceae | 8 |
| Hypericum mutilum | L. | Hypericaceae | 8 |
| Hypericum prolificum | L. | Hypericaceae | 8 |
| Hypericum punctatum | Lam. | Hypericaceae | 8 |
| Hypericum virginicum | L. | Hypericaceae | 8 |
| Hypopitys monotropa | Crantz | Ericaceae | 8 |
| Hypoxis hirsuta | (L.) Coville | Hypoxidaceae | 8 |
| Ilex glabra | (L.) A.Gray | Aquifoliaceae | 8 |
| Ilex laevigata | (Pursh) A.Gray | Aquifoliaceae | 8 |
| Ilex montana | Torr. & A.Gray | Aquifoliaceae | 8 |
| Ilex mucronata | (L.) M.Powell, Savol. & S.Andrews | Aquifoliaceae | 8 |
| Ilex opaca | Aiton | Aquifoliaceae | 8 |
| Ilex verticillata | (L.) A.Gray | Aquifoliaceae | 8 |
| Impatiens capensis | Meerb. | Balsaminaceae | 8 |
| Impatiens pallida | Nutt. | Balsaminaceae | 8 |
| Ionactis linariifolia | (L.) Greene | Asteraceae | 8 |
| Ipomoea pandurata | G.Mey. | Convolvulaceae | 8 |
| Iris prismatica | Pursh | Iridaceae | 8 |
| Iris versicolor | L. | Iridaceae | 8 |
| Isoetes echinospora | Durieu | Isoetaceae | 8 |
| Isoetes septentrionalis | D.F.Brunt. | Isoetaceae | 8 |
| Isotria medeoloides | (Pursh) Raf. | Orchidaceae | 8 |
| Isotria verticillata | (Muhl. ex Willd.) Raf. | Orchidaceae | 8 |
| Iva frutescens | L. | Asteraceae | 8 |
| Juglans cinerea | L. | Juglandaceae | 8 |
| Juglans nigra | L. | Juglandaceae | 8 |
| Juncus acuminatus | Michx. | Juncaceae | 8 |
| Juncus anthelatus | (Wiegand) R.E.Brooks & Whittem. | Juncaceae | 8 |
| Juncus articulatus | L. | Juncaceae | 8 |
| Juncus brachycarpus | Engelm. | Juncaceae | 8 |
| Juncus bufonius | L. | Juncaceae | 8 |
| Juncus canadensis | J.Gay ex Laharpe | Juncaceae | 8 |
| Juncus dichotomus | Elliott | Juncaceae | 8 |
| Juncus diffusissimus | Buckley | Juncaceae | 8 |
| Juncus dudleyi | Wiegand | Juncaceae | 8 |
| Juncus effusus | L. | Juncaceae | 8 |
| Juncus gerardi | Loisel. | Juncaceae | 8 |
| Juncus marginatus | Rostk. | Juncaceae | 8 |
| Juncus militaris | Bigelow | Juncaceae | 8 |
| Juncus nodosus | L. | Juncaceae | 8 |
| Juncus pelocarpus | E.Mey. | Juncaceae | 8 |
| Juncus pylaei | Laharpe | Juncaceae | 8 |
| Juncus tenuis | Willd. | Juncaceae | 8 |
| Juncus tweedyi | Rydb. | Juncaceae | 8 |
| Juniperus communis | L. | Cupressaceae | 8 |
| Juniperus virginiana | L. | Cupressaceae | 8 |
| Kalmia angustifolia | L. | Ericaceae | 8 |
| Kalmia latifolia | L. | Ericaceae | 8 |
| Kalmia polifolia | Wangenh. | Ericaceae | 8 |
| Kellochloa verrucosa | (Muhl.) Lizarazu, Nicola & Scataglini | 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 hirsuta | Muhl. ex Nutt. | Asteraceae | 8 |
| Laportea canadensis | (L.) Wedd. | Urticaceae | 8 |
| Larix laricina | (Du Roi) K.Koch | Pinaceae | 8 |
| Lathyrus japonicus | Willd. | Fabaceae | 8 |
| Lathyrus palustris | L. | Fabaceae | 8 |
| Lechea intermedia | Legg. ex Britton | Cistaceae | 8 |
| Lechea maritima | Legg. ex Britton | Cistaceae | 8 |
| Lechea minor | L. | Cistaceae | 8 |
| Lechea mucronata | Raf. | Cistaceae | 8 |
| Lechea racemulosa | Michx. | Cistaceae | 8 |
| Lechea tenuifolia | Michx. | Cistaceae | 8 |
| Leersia oryzoides | (L.) Sw. | Poaceae | 8 |
| Leersia virginica | Willd. | Poaceae | 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 hirta | (L.) Hornem. | Fabaceae | 8 |
| Lespedeza repens | (L.) W.P.C.Barton | Fabaceae | 8 |
| Lespedeza stuevei | Nutt. | Fabaceae | 8 |
| Lespedeza virginica | (L.) Britton | Fabaceae | 8 |
| Liatris scariosa | (L.) Willd. | Asteraceae | 8 |
| Liatris spicata | (L.) Willd. | Asteraceae | 8 |
| Lilaeopsis chinensis | (L.) Kuntze | Apiaceae | 8 |
| Lilium canadense | L. | Liliaceae | 8 |
| Lilium philadelphicum | L. | Liliaceae | 8 |
| Lilium superbum | L. | Liliaceae | 8 |
| Limonium carolinianum | (Walter) Britton | Plumbaginaceae | 8 |
| Limosella australis | R.Br. | Plantaginaceae | 8 |
| Lindera benzoin | (L.) Blume | Lauraceae | 8 |
| Lindernia dubia | (L.) Pennell | Linderniaceae | 8 |
| Linnaea borealis | L. | Caprifoliaceae | 8 |
| Linum medium | (Planch.) Britton | Linaceae | 8 |
| Linum striatum | Walter | Linaceae | 8 |
| Linum sulcatum | Riddell | Linaceae | 8 |
| Linum virginianum | L. | Linaceae | 8 |
| Liparis liliifolia | (L.) Rich. ex Lindl. | Orchidaceae | 8 |
| Liparis loeselii | (L.) Rich. | Orchidaceae | 8 |
| Liquidambar styraciflua | L. | Altingiaceae | 8 |
| Liriodendron tulipifera | L. | Magnoliaceae | 8 |
| Lithospermum parviflorum | Weakley, Witsell & D.Estes | Boraginaceae | 8 |
| Lithospermum virginianum | L. | 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 sempervirens | L. | Caprifoliaceae | 8 |
| Lonicera villosa | (Michx.) Schult. | Caprifoliaceae | 8 |
| Lorinseria areolata | (L.) C.Presl | Blechnaceae | 8 |
| Ludwigia alternifolia | L. | Onagraceae | 8 |
| Ludwigia palustris | (L.) Elliott | Onagraceae | 8 |
| Lupinus perennis | L. | Fabaceae | 8 |
| Lupinus polyphyllus | Lindl. | Fabaceae | 8 |
| Luzula acuminata | Raf. | Juncaceae | 8 |
| Luzula bulbosa | (Alph.Wood) Smyth & L.C.R.Smyth | Juncaceae | 8 |
| Luzula echinata | (Small) F.J.Herm. | Juncaceae | 8 |
| Luzula multiflora | (Ehrh.) Lej. | Juncaceae | 8 |
| Luzula parviflora | (Ehrh.) Desv. | Juncaceae | 8 |
| Lycopodiella alopecuroides | (L.) Cranfill | Lycopodiaceae | 8 |
| Lycopodiella appressa | (Chapm.) Cranfill | Lycopodiaceae | 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 amplectens | Raf. | Lamiaceae | 8 |
| Lycopus rubellus | Moench | Lamiaceae | 8 |
| Lycopus uniflorus | Michx. | Lamiaceae | 8 |
| Lycopus virginicus | L. | Lamiaceae | 8 |
| Lygodium palmatum | (Bernh.) Sw. | Lygodiaceae | 8 |
| Lyonia ligustrina | (L.) DC. | Ericaceae | 8 |
| Lyonia mariana | (L.) D.Don | Ericaceae | 8 |
| Lysimachia borealis | (Raf.) U.Manns & Anderb. | Primulaceae | 8 |
| Lysimachia ciliata | L. | Primulaceae | 8 |
| Lysimachia hybrida | Michx. | 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 |
| Lythrum lineare | L. | Lythraceae | 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 |
| Malaxis unifolia | Michx. | Orchidaceae | 8 |
| Matricaria discoidea | DC. | Asteraceae | 8 |
| Medeola virginiana | L. | Liliaceae | 8 |
| Melanthium hybridum | Walter | Melanthiaceae | 8 |
| Menispermum canadense | L. | Menispermaceae | 8 |
| Mentha canadensis | L. | Lamiaceae | 8 |
| Menyanthes trifoliata | L. | Menyanthaceae | 8 |
| Micranthes pensylvanica | (L.) Haw. | Saxifragaceae | 8 |
| Micranthes virginiensis | Small | Saxifragaceae | 8 |
| Mikania scandens | (L.) Willd. | Asteraceae | 8 |
| Milium effusum | L. | Poaceae | 8 |
| Mimulus alatus | Aiton | Phrymaceae | 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 clinopodia | L. | Lamiaceae | 8 |
| Monarda didyma | L. | Lamiaceae | 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 moscheutos | (L.) M.M.Hanes & R.L.Barrett | Malvaceae | 8 |
| Muhlenbergia capillaris | (Lam.) Trin. | Poaceae | 8 |
| Muhlenbergia frondosa | (Poir.) Fernald | Poaceae | 8 |
| Muhlenbergia glomerata | (Willd.) Trin. | Poaceae | 8 |
| Muhlenbergia mexicana | (L.) Trin. | 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 |
| Myrica pensylvanica | Mirb. | Myricaceae | 8 |
| Myriophyllum alterniflorum | DC. | Haloragaceae | 8 |
| Myriophyllum farwellii | Morong | Haloragaceae | 8 |
| Myriophyllum heterophyllum | Michx. | Haloragaceae | 8 |
| Myriophyllum humile | (Raf.) Morong | Haloragaceae | 8 |
| Myriophyllum pinnatum | (Walter) Britton, Sterns & Poggenb. | 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 altissimus | (L.) Hook. | Asteraceae | 8 |
| Nabalus serpentaria | (Pursh) Hook. | Asteraceae | 8 |
| Nabalus trifoliolatus | Cass. | Asteraceae | 8 |
| Najas flexilis | (Willd.) Rostk. & W.L.E.Schmidt | Hydrocharitaceae | 8 |
| Najas guadalupensis | (Spreng.) Magnus | Hydrocharitaceae | 8 |
| Nelumbo lutea | (Willd.) Pers. | Nelumbonaceae | 8 |
| Neottia cordata | (L.) Rich. | Orchidaceae | 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 |
| Nymphoides cordata | (Elliott) Fernald | Menyanthaceae | 8 |
| Nyssa sylvatica | Marshall | Nyssaceae | 8 |
| Oclemena acuminata | (Michx.) Greene | Asteraceae | 8 |
| Oclemena nemoralis | (Aiton) Greene | Asteraceae | 8 |
| Oenothera biennis | L. | Onagraceae | 8 |
| Oenothera fruticosa | L. | Onagraceae | 8 |
| Oenothera gaura | W.L.Wagner & Hoch | Onagraceae | 8 |
| Oenothera laciniata | Hill | 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 tetragona | Roth | 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 humifusa | (Raf.) Raf. | Cactaceae | 8 |
| Oreojuncus trifidus | (L.) Záv.Drábk. & Kirschner | Juncaceae | 8 |
| Orobanche uniflora | L. | Orobanchaceae | 8 |
| Orontium aquaticum | L. | Araceae | 8 |
| Orthilia secunda | (L.) House | Ericaceae | 8 |
| Oryzopsis asperifolia | Michx. | Poaceae | 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 florida | Salisb. | Oxalidaceae | 8 |
| Oxalis montana | Raf. | Oxalidaceae | 8 |
| Oxalis stricta | L. | Oxalidaceae | 8 |
| Oxalis violacea | L. | Oxalidaceae | 8 |
| Oxybaphus nyctagineus | (Michx.) Sweet | Nyctaginaceae | 8 |
| Packera anonyma | (Wood) W.A.Weber & Á.Löve | Asteraceae | 8 |
| Packera aurea | (L.) Á.Löve & D.Löve | Asteraceae | 8 |
| Panax quinquefolius | L. | Araliaceae | 8 |
| Panax trifolius | L. | Araliaceae | 8 |
| Panicum amarum | Elliott | Poaceae | 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 |
| 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 laeve | Michx. | Poaceae | 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 |
| Pellaea atropurpurea | (L.) Link | Pteridaceae | 8 |
| Pellaea glabella | Mett. | Pteridaceae | 8 |
| Peltandra virginica | (L.) Schott | Araceae | 8 |
| Penstemon calycosus | Small | Plantaginaceae | 8 |
| Penstemon hirsutus | (L.) Willd. | Plantaginaceae | 8 |
| Penstemon laevigatus | Aiton | Plantaginaceae | 8 |
| Penstemon pallidus | Small | 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 robustior | (Small) E.P.Bicknell | Polygonaceae | 8 |
| Persicaria sagittata | (L.) H.Gross | Polygonaceae | 8 |
| Persicaria virginiana | (L.) Gaertn. | Polygonaceae | 8 |
| Petasites frigidus | (L.) Fr. | Asteraceae | 8 |
| Phacelia linearis | (Pursh) Holz. | Hydrophyllaceae | 8 |
| Phacelia purshii | Buckley | Hydrophyllaceae | 8 |
| Phalaris arundinacea | L. | Poaceae | 8 |
| Phaseolus polystachios | (L.) Britton, Sterns & Poggenb. | Fabaceae | 8 |
| Phegopteris connectilis | (Michx.) Watt | Thelypteridaceae | 8 |
| Phegopteris excelsior | N.R.Patel & A.V.Gilman | Thelypteridaceae | 8 |
| Phlox divaricata | L. | Polemoniaceae | 8 |
| Phlox drummondii | Hook. | Polemoniaceae | 8 |
| Phlox maculata | L. | Polemoniaceae | 8 |
| Phlox paniculata | L. | Polemoniaceae | 8 |
| Phlox pilosa | L. | Polemoniaceae | 8 |
| Phlox subulata | L. | Polemoniaceae | 8 |
| Phragmites australis | (Cav.) Steud. | Poaceae | 8 |
| Phryma leptostachya | L. | Phrymaceae | 8 |
| Physalis longifolia | Nutt. | Solanaceae | 8 |
| Physalis virginiana | Mill. | Solanaceae | 8 |
| Physocarpus opulifolius | (L.) Maxim. | Rosaceae | 8 |
| Physostegia virginiana | (L.) Benth. | Lamiaceae | 8 |
| Phytolacca americana | L. | Phytolaccaceae | 8 |
| Picea mariana | Britton, Sterns & Poggenb. | Pinaceae | 8 |
| Picea rubens | Sarg. | Pinaceae | 8 |
| Pilea fontana | (Lunell) Rydb. | Urticaceae | 8 |
| Pilea pumila | A.Gray | Urticaceae | 8 |
| Pinus echinata | Mill. | Pinaceae | 8 |
| Pinus resinosa | Aiton | Pinaceae | 8 |
| Pinus rigida | Mill. | Pinaceae | 8 |
| Pinus strobus | L. | Pinaceae | 8 |
| Piptatheropsis pungens | (Torr. ex Spreng.) Romasch., P.M.Peterson & Soreng | Poaceae | 8 |
| Piptochaetium avenaceum | (L.) Parodi | Poaceae | 8 |
| Pityopsis falcata | Nutt. | Asteraceae | 8 |
| Plantago aristata | Michx. | Plantaginaceae | 8 |
| Plantago maritima | L. | Plantaginaceae | 8 |
| Plantago rugelii | Decne. | Plantaginaceae | 8 |
| Plantago virginica | L. | Plantaginaceae | 8 |
| Platanthera aquilonis | Sheviak | Orchidaceae | 8 |
| Platanthera blephariglottis | (Willd.) Lindl. | Orchidaceae | 8 |
| Platanthera ciliaris | (L.) Lindl. | Orchidaceae | 8 |
| Platanthera clavellata | (Michx.) Luer | Orchidaceae | 8 |
| Platanthera flava | (L.) Lindl. | Orchidaceae | 8 |
| Platanthera grandiflora | (Bigelow) Lindl. | Orchidaceae | 8 |
| Platanthera hookeri | (Torr.) Lindl. | Orchidaceae | 8 |
| Platanthera huronensis | Lindl. | Orchidaceae | 8 |
| Platanthera lacera | (Michx.) G.Don | Orchidaceae | 8 |
| Platanthera orbiculata | (Pursh) Lindl. | Orchidaceae | 8 |
| Platanthera psycodes | (L.) Lindl. | Orchidaceae | 8 |
| Platanus occidentalis | L. | Platanaceae | 8 |
| Pluchea odorata | (L.) Cass. | Asteraceae | 8 |
| Poa alsodes | A.Gray | Poaceae | 8 |
| Poa nemoralis | L. | Poaceae | 8 |
| Poa palustris | L. | Poaceae | 8 |
| Poa pratensis | L. | 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 glaucum | Nutt. | Polygonaceae | 8 |
| Polygonum tenue | Michx. | Polygonaceae | 8 |
| Polymnia canadensis | L. | Asteraceae | 8 |
| Polypodium appalachianum | Haufler & Windham | Polypodiaceae | 8 |
| Polypodium virginianum | L. | Polypodiaceae | 8 |
| Polystichum acrostichoides | (Michx.) Schott | Dryopteridaceae | 8 |
| Polystichum braunii | (Spenn.) Fée | Dryopteridaceae | 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 heterophylla | L. | Salicaceae | 8 |
| Populus tremuloides | Michx. | Salicaceae | 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 canadensis | L. | Rosaceae | 8 |
| Potentilla norvegica | L. | Rosaceae | 8 |
| Potentilla pulcherrima | Lehm. | Rosaceae | 8 |
| Potentilla simplex | Michx. | Rosaceae | 8 |
| Proserpinaca intermedia | Mack. | Haloragaceae | 8 |
| Proserpinaca palustris | L. | Haloragaceae | 8 |
| Prunella vulgaris | L. | Lamiaceae | 8 |
| Prunus americana | Marshall | Rosaceae | 8 |
| Prunus maritima | Marshall | Rosaceae | 8 |
| Prunus nigra | Aiton | Rosaceae | 8 |
| Prunus pensylvanica | L.f. | 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 |
| Pteridium aquilinum | (L.) Kuhn | Dennstaedtiaceae | 8 |
| Ptilimnium capillaceum | (Michx.) Raf. | Apiaceae | 8 |
| Pycnanthemum incanum | (L.) Michx. | Lamiaceae | 8 |
| Pycnanthemum muticum | (Michx.) Pers. | Lamiaceae | 8 |
| Pycnanthemum tenuifolium | Schrad. | Lamiaceae | 8 |
| Pycnanthemum verticillatum | (Michx.) Pers. | Lamiaceae | 8 |
| Pycnanthemum virginianum | (L.) T.Durand & B.D.Jacks. ex B.L.Rob. & Fernald | Lamiaceae | 8 |
| Pyrola americana | Sweet | Ericaceae | 8 |
| Pyrola chlorantha | Sw. | Ericaceae | 8 |
| Pyrola elliptica | Nutt. | Ericaceae | 8 |
| Quercus alba | L. | Fagaceae | 8 |
| Quercus bicolor | Willd. | Fagaceae | 8 |
| Quercus coccinea | Münchh. | Fagaceae | 8 |
| Quercus ilicifolia | Wangenh. | Fagaceae | 8 |
| Quercus macrocarpa | Michx. | Fagaceae | 8 |
| Quercus montana | Willd. | Fagaceae | 8 |
| Quercus muehlenbergii | Engelm. | Fagaceae | 8 |
| Quercus palustris | Münchh. | Fagaceae | 8 |
| Quercus prinoides | Willd. | Fagaceae | 8 |
| Quercus rubra | L. | Fagaceae | 8 |
| Quercus stellata | Wangenh. | Fagaceae | 8 |
| Quercus velutina | Lam. | Fagaceae | 8 |
| Ranunculus abortivus | L. | Ranunculaceae | 8 |
| Ranunculus allegheniensis | Britton | Ranunculaceae | 8 |
| Ranunculus fascicularis | Muhl. ex Bigelow | Ranunculaceae | 8 |
| Ranunculus flabellaris | Raf. | Ranunculaceae | 8 |
| Ranunculus flammula | L. | Ranunculaceae | 8 |
| Ranunculus hispidus | Michx. | Ranunculaceae | 8 |
| Ranunculus micranthus | Nutt. | Ranunculaceae | 8 |
| Ranunculus pensylvanicus | L.f. | Ranunculaceae | 8 |
| Ranunculus recurvatus | Poir. | Ranunculaceae | 8 |
| Ranunculus reptans | L. | Ranunculaceae | 8 |
| Ranunculus sceleratus | L. | Ranunculaceae | 8 |
| Ranunculus trichophyllus | Chaix | Ranunculaceae | 8 |
| Rhamnus alnifolia | L'Hér. | Rhamnaceae | 8 |
| Rhexia virginica | L. | Melastomataceae | 8 |
| Rhododendron canadense | (L.) Torr. | Ericaceae | 8 |
| Rhododendron groenlandicum | (Oeder) Kron & Judd | Ericaceae | 8 |
| Rhododendron maximum | L. | Ericaceae | 8 |
| Rhododendron periclymenoides | (Michx.) Shinners | Ericaceae | 8 |
| Rhododendron viscosum | (L.) Torr. | 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 |
| Rhynchospora macrostachya | Torr. ex A.Gray | Cyperaceae | 8 |
| Ribes americanum | Mill. | Grossulariaceae | 8 |
| Ribes cynosbati | L. | Grossulariaceae | 8 |
| Ribes glandulosum | Weber | Grossulariaceae | 8 |
| Ribes hirtellum | Michx. | Grossulariaceae | 8 |
| Ribes lacustre | (Pers.) Poir. | Grossulariaceae | 8 |
| Ribes missouriense | Nutt. | Grossulariaceae | 8 |
| Ribes rotundifolium | Michx. | Grossulariaceae | 8 |
| Ribes triste | Pall. | Grossulariaceae | 8 |
| Rorippa palustris | (L.) Besser | Brassicaceae | 8 |
| Rosa carolina | L. | Rosaceae | 8 |
| Rosa nitida | Willd. | Rosaceae | 8 |
| Rosa palustris | Marshall | Rosaceae | 8 |
| Rosa setigera | Michx. | Rosaceae | 8 |
| Rosa virginiana | Mill. | Rosaceae | 8 |
| Rotala ramosior | (L.) Koehne | Lythraceae | 8 |
| Rubus allegheniensis | Porter | Rosaceae | 8 |
| Rubus canadensis | L. | Rosaceae | 8 |
| Rubus cuneifolius | Pursh | 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 pubescens | Raf. | Rosaceae | 8 |
| Rubus repens | (L.) Kuntze | 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 |
| Rumex altissimus | Alph.Wood | Polygonaceae | 8 |
| Rumex britannica | L. | Polygonaceae | 8 |
| Rumex maritimus | L. | Polygonaceae | 8 |
| Rumex triangulivalvis | (Danser) Rech.f. | Polygonaceae | 8 |
| Rumex verticillatus | L. | Polygonaceae | 8 |
| Ruppia maritima | L. | Ruppiaceae | 8 |
| Sabatia stellaris | Pursh | Gentianaceae | 8 |
| Sabulina michauxii | (Fenzl) Dillenb. & Kadereit | Caryophyllaceae | 8 |
| Sagina decumbens | (Elliott) Torr. & A.Gray | Caryophyllaceae | 8 |
| Sagittaria cuneata | E.Sheld. | Alismataceae | 8 |
| Sagittaria engelmanniana | J.G.Sm. | Alismataceae | 8 |
| Sagittaria graminea | Michx. | Alismataceae | 8 |
| Sagittaria latifolia | Willd. | Alismataceae | 8 |
| Sagittaria rigida | Pursh | Alismataceae | 8 |
| Salicornia pacifica | Standl. | Chenopodiaceae | 8 |
| Salix bebbiana | Sarg. | Salicaceae | 8 |
| Salix candida | Flüggé ex Willd. | 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 nigra | Marshall | Salicaceae | 8 |
| Salix pedicellaris | Pursh | Salicaceae | 8 |
| Salix petiolaris | Sm. | Salicaceae | 8 |
| Salix sericea | Marshall | Salicaceae | 8 |
| Salix serissima | (L.H.Bailey ex Arthur) Fernald | Salicaceae | 8 |
| Salvia lyrata | L. | Lamiaceae | 8 |
| Sambucus canadensis | L. | Viburnaceae | 8 |
| Sambucus racemosa | L. | Viburnaceae | 8 |
| Samolus parviflorus | Raf. | Primulaceae | 8 |
| Sanguinaria canadensis | L. | Papaveraceae | 8 |
| Sanguisorba canadensis | L. | Rosaceae | 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 |
| Sassafras albidum | (Nutt.) Nees | Lauraceae | 8 |
| Sceptridium biternatum | (Savigny) Lyon | Ophioglossaceae | 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 littorale | (Nash) E.P.Bicknell | 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 americanus | (Pers.) Volkart | 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 |
| Scirpus polyphyllus | Vahl | Cyperaceae | 8 |
| Scleria pauciflora | Muhl. ex Willd. | 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 integrifolia | L. | Lamiaceae | 8 |
| Scutellaria lateriflora | L. | Lamiaceae | 8 |
| Scutellaria parvula | Michx. | Lamiaceae | 8 |
| Sedum ternatum | Michx. | Crassulaceae | 8 |
| Selaginella apoda | Spring | Selaginellaceae | 8 |
| Selaginella eclipes | W.R.Buck | Selaginellaceae | 8 |
| Selaginella rupestris | (L.) Spring | Selaginellaceae | 8 |
| Senna hebecarpa | (Fernald) H.S.Irwin & Barneby | Fabaceae | 8 |
| Senna marilandica | (L.) Link | Fabaceae | 8 |
| Sericocarpus asteroides | (L.) Britton, Sterns & Poggenb. | Asteraceae | 8 |
| Sericocarpus linifolius | Britton, Sterns & Poggenb. | Asteraceae | 8 |
| Setaria parviflora | (Poir.) Kerguélen | Poaceae | 8 |
| Sibbaldia tridentata | (Aiton) Paule & Soják | Rosaceae | 8 |
| Sicyos angulatus | L. | Cucurbitaceae | 8 |
| Silene antirrhina | L. | Caryophyllaceae | 8 |
| Silene caroliniana | Walter | Caryophyllaceae | 8 |
| Silene stellata | W.T.Aiton | Caryophyllaceae | 8 |
| Silphium perfoliatum | L. | Asteraceae | 8 |
| Sisyrinchium angustifolium | Mill. | Iridaceae | 8 |
| Sisyrinchium atlanticum | E.P.Bicknell | Iridaceae | 8 |
| Sisyrinchium fuscatum | 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 glauca | Walter | Smilacaceae | 8 |
| Smilax rotundifolia | L. | Smilacaceae | 8 |
| Smilax tamnoides | L. | Smilacaceae | 8 |
| Solanum carolinense | L. | Solanaceae | 8 |
| Solanum emulans | Raf. | Solanaceae | 8 |
| Solidago altissima | L. | Asteraceae | 8 |
| Solidago arguta | Aiton | Asteraceae | 8 |
| Solidago bicolor | L. | Asteraceae | 8 |
| Solidago caesia | L. | Asteraceae | 8 |
| Solidago canadensis | L. | Asteraceae | 8 |
| Solidago erecta | Herb.Banks ex Pursh | Asteraceae | 8 |
| Solidago flexicaulis | L. | Asteraceae | 8 |
| Solidago gigantea | Aiton | Asteraceae | 8 |
| Solidago hispida | Muhl. ex Willd. | Asteraceae | 8 |
| Solidago juncea | Aiton | Asteraceae | 8 |
| Solidago latissimifolia | Mill. | Asteraceae | 8 |
| Solidago nemoralis | Aiton | Asteraceae | 8 |
| Solidago odora | Aiton | Asteraceae | 8 |
| Solidago patula | Muhl. ex Willd. | Asteraceae | 8 |
| Solidago ptarmicoides | (Torr. & A.Gray) B.Boivin | Asteraceae | 8 |
| Solidago puberula | Nutt. | Asteraceae | 8 |
| Solidago rigida | L. | Asteraceae | 8 |
| Solidago rugosa | Mill. | Asteraceae | 8 |
| Solidago sempervirens | L. | Asteraceae | 8 |
| Solidago speciosa | Nutt. | Asteraceae | 8 |
| Solidago squarrosa | Muhl. | 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 |
| Spergularia canadensis | (Pers.) G.Don | Caryophyllaceae | 8 |
| Spergularia marina | (L.) Besser | Caryophyllaceae | 8 |
| Sphenopholis intermedia | (Rydb.) Rydb. | Poaceae | 8 |
| Sphenopholis nitida | (Biehler) Scribn. | Poaceae | 8 |
| Sphenopholis obtusata | (Michx.) Scribn. | Poaceae | 8 |
| Sphenopholis pensylvanica | (L.) Hitchc. | Poaceae | 8 |
| Spinulum annotinum | (L.) A.Haines | Lycopodiaceae | 8 |
| Spiraea alba | Du Roi | Rosaceae | 8 |
| Spiraea tomentosa | L. | Rosaceae | 8 |
| Spiranthes arcisepala | M.C.Pace | Orchidaceae | 8 |
| Spiranthes cernua | (L.) Rich. | Orchidaceae | 8 |
| Spiranthes lacera | (Raf.) Raf. | Orchidaceae | 8 |
| Spiranthes lucida | (H.H.Eaton) Ames | Orchidaceae | 8 |
| Spiranthes ochroleuca | (Rydb.) Rydb. | Orchidaceae | 8 |
| Spiranthes romanzoffiana | Cham. | Orchidaceae | 8 |
| Spiranthes tuberosa | Raf. | Orchidaceae | 8 |
| Spiranthes vernalis | Engelm. & A.Gray | Orchidaceae | 8 |
| Spirodela polyrhiza | (L.) Schleid. | Araceae | 8 |
| Sporobolus alterniflorus | (Loisel.) P.M.Peterson & Saarela | Poaceae | 8 |
| Sporobolus clandestinus | (Biehler) Hitchc. | Poaceae | 8 |
| Sporobolus compositus | (Poir.) Merr. | Poaceae | 8 |
| Sporobolus contractus | Hitchc. | Poaceae | 8 |
| Sporobolus cryptandrus | (Torr.) A.Gray | Poaceae | 8 |
| Sporobolus cynosuroides | (L.) P.M.Peterson & Saarela | 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 pumilus | (Roth) P.M.Peterson & Saarela | Poaceae | 8 |
| Sporobolus vaginiflorus | (Torr. ex A.Gray) Alph.Wood | Poaceae | 8 |
| Stachys pilosa | Nutt. | Lamiaceae | 8 |
| Stachys tenuifolia | Willd. | Lamiaceae | 8 |
| Stellaria borealis | Bigelow | Caryophyllaceae | 8 |
| Stellaria corei | Shinners | Caryophyllaceae | 8 |
| Stellaria longifolia | Muhl. ex Willd. | Caryophyllaceae | 8 |
| Streptopus amplexifolius | (L.) DC. | Liliaceae | 8 |
| Streptopus lanceolatus | (Aiton) Reveal | Liliaceae | 8 |
| Stuckenia pectinata | (L.) Börner | Potamogetonaceae | 8 |
| Suaeda calceoliformis | (Hook.) Moq. | Chenopodiaceae | 8 |
| Suaeda linearis | (Elliott) Moq. | Chenopodiaceae | 8 |
| Suaeda maritima | (L.) Dumort. | Chenopodiaceae | 8 |
| Symphoricarpos albus | (L.) S.F.Blake | Caprifoliaceae | 8 |
| Symphyotrichum cordifolium | (L.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum dumosum | (L.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum ericoides | (L.) 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 novi-belgii | (L.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum patens | (Aiton) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum phlogifolium | (Muhl. ex Willd.) 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 tenuifolium | (L.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum undulatum | (L.) G.L.Nesom | Asteraceae | 8 |
| Symplocarpus foetidus | (L.) Salisb. ex W.P.C.Barton | Araceae | 8 |
| Taenidia integerrima | (L.) Drude | Apiaceae | 8 |
| Taxus canadensis | Marshall | Taxaceae | 8 |
| Tephrosia virginiana | (L.) Pers. | Fabaceae | 8 |
| Teucrium canadense | L. | Lamiaceae | 8 |
| Thalictrum dioicum | L. | Ranunculaceae | 8 |
| Thalictrum pubescens | Pursh | Ranunculaceae | 8 |
| Thalictrum revolutum | DC. | Ranunculaceae | 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 ohiensis | Raf. | Commelinaceae | 8 |
| Tradescantia virginiana | L. | Commelinaceae | 8 |
| Trichogalium boreale | (L.) Fourr. | Rubiaceae | 8 |
| Trichogalium lanceolatum | (Torr. & A.Gray) Kadereit & Schneew. | Rubiaceae | 8 |
| Trichophorum alpinum | (L.) Pers. | Cyperaceae | 8 |
| Trichophorum planifolium | (Spreng.) Palla | Cyperaceae | 8 |
| Trichostema dichotomum | L. | Lamiaceae | 8 |
| Trichostema setaceum | Houtt. | Lamiaceae | 8 |
| Tridens flavus | (L.) Hitchc. | Poaceae | 8 |
| Triglochin maritima | L. | Juncaginaceae | 8 |
| Trillium cernuum | L. | Melanthiaceae | 8 |
| Trillium erectum | L. | Melanthiaceae | 8 |
| Trillium grandiflorum | (Michx.) Salisb. | Melanthiaceae | 8 |
| Trillium undulatum | Willd. | Melanthiaceae | 8 |
| Triodanis perfoliata | (L.) Nieuwl. | Campanulaceae | 8 |
| Triosteum angustifolium | L. | Caprifoliaceae | 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 |
| Tripsacum dactyloides | (L.) L. | Poaceae | 8 |
| Trollius laxus | Salisb. | Ranunculaceae | 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 |
| 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 radiata | Small | Lentibulariaceae | 8 |
| Utricularia resupinata | B.D.Greene ex Bigelow | Lentibulariaceae | 8 |
| Utricularia striata | Leconte ex Torr. | Lentibulariaceae | 8 |
| Uvularia grandiflora | Sm. | Colchicaceae | 8 |
| Uvularia perfoliata | L. | Colchicaceae | 8 |
| Uvularia sessilifolia | L. | Colchicaceae | 8 |
| Vaccinium angustifolium | Aiton | Ericaceae | 8 |
| Vaccinium corymbosum | L. | Ericaceae | 8 |
| Vaccinium macrocarpon | Aiton | Ericaceae | 8 |
| Vaccinium myrtilloides | Michx. | Ericaceae | 8 |
| Vaccinium oxycoccos | L. | Ericaceae | 8 |
| Vaccinium pallidum | Aiton | Ericaceae | 8 |
| Vaccinium stamineum | L. | Ericaceae | 8 |
| Vaccinium vitis-idaea | L. | Ericaceae | 8 |
| Valeriana umbilicata | (Sull.) Christenh. & Byng | Caprifoliaceae | 8 |
| Vallisneria americana | Michx. | Hydrocharitaceae | 8 |
| Veratrum viride | Aiton | Melanthiaceae | 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 |
| Vernonia noveboracensis | (L.) Michx. | Asteraceae | 8 |
| Veronica americana | (Raf.) Schwein. ex Benth. | 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 dentatum | L. | Viburnaceae | 8 |
| Viburnum lantanoides | Michx. | Viburnaceae | 8 |
| Viburnum lentago | L. | Viburnaceae | 8 |
| Viburnum nudum | L. | Viburnaceae | 8 |
| Viburnum opulus | L. | Viburnaceae | 8 |
| Viburnum prunifolium | L. | Viburnaceae | 8 |
| Viburnum rafinesqueanum | Schult. | Viburnaceae | 8 |
| Viburnum recognitum | Fernald | Viburnaceae | 8 |
| Viola affinis | Leconte | Violaceae | 8 |
| Viola blanda | Willd. | Violaceae | 8 |
| Viola canadensis | L. | Violaceae | 8 |
| Viola cucullata | Aiton | Violaceae | 8 |
| Viola hastata | Michx. | Violaceae | 8 |
| Viola hirsutula | Brainerd | Violaceae | 8 |
| Viola labradorica | Schrank | Violaceae | 8 |
| Viola lanceolata | L. | Violaceae | 8 |
| Viola macloskeyi | F.E.Lloyd | Violaceae | 8 |
| Viola nephrophylla | Greene | Violaceae | 8 |
| Viola palmata | L. | Violaceae | 8 |
| Viola pedata | L. | Violaceae | 8 |
| Viola primulifolia | L. | Violaceae | 8 |
| Viola pubescens | Aiton | Violaceae | 8 |
| Viola renifolia | A.Gray | Violaceae | 8 |
| Viola rostrata | Pursh | Violaceae | 8 |
| Viola rotundifolia | Michx. | Violaceae | 8 |
| Viola sagittata | Aiton | Violaceae | 8 |
| Viola sororia | Willd. | Violaceae | 8 |
| Viola striata | Aiton | Violaceae | 8 |
| Viola subsinuata | Greene | Violaceae | 8 |
| Vitis aestivalis | Michx. | Vitaceae | 8 |
| Vitis labrusca | L. | Vitaceae | 8 |
| Vitis riparia | Michx. | Vitaceae | 8 |
| Waldsteinia fragarioides | (Michx.) Tratt. | Rosaceae | 8 |
| Wisteria frutescens | (L.) Poir. | Fabaceae | 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 |
| Xanthium orientale | L. | Asteraceae | 8 |
| Xanthium spinosum | L. | Asteraceae | 8 |
| Xyris difformis | Chapm. | Xyridaceae | 8 |
| Xyris montana | Ries | Xyridaceae | 8 |
| Xyris smalliana | Nash | Xyridaceae | 8 |
| Xyris torta | Sm. | Xyridaceae | 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 |
| Zostera marina | L. | Zosteraceae | 8 |
| Bromus marginatus | Nees ex Steud. | Poaceae | 7 |
| Carex merritt-fernaldii | Mack. | Cyperaceae | 7 |
| Carex reznicekii | Werier | Cyperaceae | 7 |
| Hypericum adpressum | W.P.C.Barton | Hypericaceae | 7 |
| Isoetes lacustris | L. | Isoetaceae | 7 |
| Atriplex cristata | Humb. & Bonpl. ex Willd. | Chenopodiaceae | 6 |
| Carex alata | Torr. | Cyperaceae | 6 |
| Carex appalachica | J.M.Webber & P.W.Ball | Cyperaceae | 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 |
| Plantago pusilla | Nutt. | Plantaginaceae | 6 |
| Podostemum ceratophyllum | Michx. | Podostemaceae | 6 |
| Polygonum careyi | Olney | Polygonaceae | 6 |
| Polygonum ramosissimum | Michx. | Polygonaceae | 6 |
| Sparganium androcladum | (Engelm.) Morong | Typhaceae | 6 |
| Stachys hyssopifolia | Michx. | Lamiaceae | 6 |
| Carex oederi | Retz. | Cyperaceae | 5 |
| Carex ormostachya | Wiegand | Cyperaceae | 5 |
| Crocanthemum propinquum | (E.P.Bicknell) E.P.Bicknell | Cistaceae | 5 |
| Eleocharis flavescens | (Poir.) Urb. | Cyperaceae | 5 |
| Juncus greenei | Oakes & Tuck. | Juncaceae | 5 |
| Myriophyllum tenellum | Bigelow | Haloragaceae | 5 |
| Panicum philadelphicum | Bernh. ex Nees | Poaceae | 5 |
| Potamogeton confervoides | Rchb. | Potamogetonaceae | 5 |
| Rhynchospora scirpoides | (Torr.) Griseb. | Cyperaceae | 5 |
| Carex oligocarpa | Willd. | Cyperaceae | 4 |
| Carex seorsa | Howe | Cyperaceae | 4 |
| Helanthium tenellum | (Mart. ex Schult.f.) Britton | Alismataceae | 4 |
| Juncus subcaudatus | (Engelm.) Coville & S.F.Blake | Juncaceae | 4 |
| Ludwigia polycarpa | Short & R.Peter | Onagraceae | 4 |
| Potamogeton bicupulatus | Fernald | Potamogetonaceae | 4 |
| Potamogeton oakesianus | J.W.Robbins | Potamogetonaceae | 4 |
| Pycnanthemum clinopodioides | Torr. & A.Gray | Lamiaceae | 4 |
| Pycnanthemum torreyi | Benth. | Lamiaceae | 4 |
| Sabatia dodecandra | (L.) Britton, Sterns & Poggenb. | Gentianaceae | 4 |
| Sagittaria subulata | (L.) Buchenau | Alismataceae | 4 |
| Scirpus expansus | Fernald | Cyperaceae | 4 |
| Carex lupuliformis | Sartwell ex Dewey | Cyperaceae | 3 |
| Carex mesochorea | Mack. | Cyperaceae | 3 |
| Chenopodium desiccatum | A.Nelson | Chenopodiaceae | 3 |
| Oenothera nutans | G.F.Atk. & Bartlett | Onagraceae | 3 |
| Potamogeton pulcher | Tuck. | Potamogetonaceae | 3 |
| Pteridium latiusculum | Hieron. | Dennstaedtiaceae | 3 |
| Sagittaria filiformis | J.G.Sm. | Alismataceae | 3 |