| Abdra brachycarpa | Greene | Brassicaceae | 8 |
| Abronia fragrans | Nutt. ex Hook. | Nyctaginaceae | 8 |
| Abronia micrantha | Torr. | Nyctaginaceae | 8 |
| Acaciella angustissima | (Mill.) Britton & Rose | Fabaceae | 8 |
| Acalypha deamii | (Weath.) H.E.Ahles | Euphorbiaceae | 8 |
| Acalypha monococca | (Engelm. ex A.Gray) Lill.W.Mill. & Gandhi | Euphorbiaceae | 8 |
| Acalypha persimilis | Müll.Arg. | Euphorbiaceae | 8 |
| Acalypha rhomboidea | Raf. | Euphorbiaceae | 8 |
| Acalypha virginica | L. | Euphorbiaceae | 8 |
| Acer negundo | L. | Sapindaceae | 8 |
| Acer saccharinum | L. | Sapindaceae | 8 |
| Acer saccharum | Marshall | Sapindaceae | 8 |
| Acorus calamus | L. | Acoraceae | 8 |
| Actaea pachypoda | Elliott | Ranunculaceae | 8 |
| Adiantum pedatum | L. | Pteridaceae | 8 |
| Aesculus glabra | Willd. | Sapindaceae | 8 |
| Agalinis aspera | (Douglas ex Benth.) Britton | Orobanchaceae | 8 |
| Agalinis auriculata | (Michx.) S.F.Blake | Orobanchaceae | 8 |
| Agalinis densiflora | (Benth.) S.F.Blake | Orobanchaceae | 8 |
| Agalinis fasciculata | (Elliott) Raf. | Orobanchaceae | 8 |
| Agalinis gattingeri | (Small) Small ex Britton & A.Br. | Orobanchaceae | 8 |
| Agalinis heterophylla | (Nutt.) Small ex Britton | 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 |
| Agrimonia gryposepala | Wallr. | Rosaceae | 8 |
| Agrimonia parviflora | Aiton | Rosaceae | 8 |
| Agrimonia pubescens | Wallr. | Rosaceae | 8 |
| Agrimonia rostellata | Wallr. | Rosaceae | 8 |
| Agrostis hyemalis | (Walter) Britton, Sterns & Poggenb. | Poaceae | 8 |
| Agrostis perennans | (Walter) Tuck. | Poaceae | 8 |
| Alisma subcordatum | Raf. | Alismataceae | 8 |
| Alisma triviale | Pursh | Alismataceae | 8 |
| Allium canadense | L. | Amaryllidaceae | 8 |
| Allium drummondii | Regel | Amaryllidaceae | 8 |
| Allium stellatum | Nutt. ex Ker Gawl. | Amaryllidaceae | 8 |
| Allium textile | A.Nelson & J.F.Macbr. | Amaryllidaceae | 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 acanthicarpa | Hook. | Asteraceae | 8 |
| Ambrosia artemisiifolia | L. | Asteraceae | 8 |
| Ambrosia bidentata | Michx. | Asteraceae | 8 |
| Ambrosia confertiflora | DC. | Asteraceae | 8 |
| Ambrosia grayi | (A.Nelson) Shinners | Asteraceae | 8 |
| Ambrosia psilostachya | DC. | Asteraceae | 8 |
| Ambrosia trifida | L. | Asteraceae | 8 |
| Amelanchier alnifolia | (Nutt.) Nutt. ex M.Roem. | Rosaceae | 8 |
| Amelanchier arborea | (F.Michx.) Fernald | Rosaceae | 8 |
| Amelanchier humilis | Wiegand | Rosaceae | 8 |
| Ammannia auriculata | Willd. | Lythraceae | 8 |
| Ammannia coccinea | Rottb. | Lythraceae | 8 |
| Ammannia robusta | Heer & Regel | Lythraceae | 8 |
| Ammoselinum butleri | (Engelm. ex S.Watson) J.M.Coult. & Rose | Apiaceae | 8 |
| Ammoselinum popei | Torr. & A.Gray | Apiaceae | 8 |
| Amorpha canescens | Pursh | Fabaceae | 8 |
| Amorpha nana | Nutt. | Fabaceae | 8 |
| Ampelopsis cordata | Michx. | Vitaceae | 8 |
| Amphicarpaea bracteata | (L.) Fernald | Fabaceae | 8 |
| Amsonia tabernaemontana | Walter | Apocynaceae | 8 |
| Andropogon hallii | Hack. | Poaceae | 8 |
| Andropogon virginicus | L. | Poaceae | 8 |
| Androsace occidentalis | Pursh | Primulaceae | 8 |
| Anemonastrum canadense | (L.) Mosyakin | Ranunculaceae | 8 |
| Anemone berlandieri | Pritz. | Ranunculaceae | 8 |
| Anemone caroliniana | Walter | Ranunculaceae | 8 |
| Anemone cylindrica | A.Gray | Ranunculaceae | 8 |
| Anemone virginiana | L. | Ranunculaceae | 8 |
| Anemonella thalictroides | Spach | Ranunculaceae | 8 |
| Anemopsis californica | (Nutt.) Hook. & Arn. | Saururaceae | 8 |
| Antennaria howellii | Greene | Asteraceae | 8 |
| Antennaria neglecta | Greene | Asteraceae | 8 |
| Antennaria parlinii | Fernald | Asteraceae | 8 |
| Apios americana | Medik. | Fabaceae | 8 |
| Aplectrum hyemale | (Muhl. ex Willd.) Torr. | Orchidaceae | 8 |
| Apocynum cannabinum | L. | Apocynaceae | 8 |
| Aquarius cordifolius | (L.) Christenh. & Byng | Alismataceae | 8 |
| Aquilegia canadensis | L. | Ranunculaceae | 8 |
| Aralia racemosa | L. | Araliaceae | 8 |
| Argemone polyanthemos | (Fedde) Ownbey | Papaveraceae | 8 |
| Argemone squarrosa | Greene | Papaveraceae | 8 |
| Argyrochosma dealbata | (Pursh) Windham | Pteridaceae | 8 |
| Arisaema dracontium | (L.) Schott | Araceae | 8 |
| Arisaema triphyllum | (L.) Schott | Araceae | 8 |
| Aristida adscensionis | L. | Poaceae | 8 |
| Aristida desmantha | Trin. & Rupr. | Poaceae | 8 |
| Aristida divaricata | Humb. & Bonpl. ex Willd. | Poaceae | 8 |
| Aristida longespica | Poir. | Poaceae | 8 |
| Aristida oligantha | Michx. | Poaceae | 8 |
| Aristida purpurascens | Poir. | Poaceae | 8 |
| Aristida purpurea | Nutt. | Poaceae | 8 |
| Aristolochia serpentaria | L. | Aristolochiaceae | 8 |
| Aristolochia tomentosa | Sims | Aristolochiaceae | 8 |
| Arnoglossum atriplicifolium | (L.) H.Rob. | Asteraceae | 8 |
| Arnoglossum plantagineum | Raf. | Asteraceae | 8 |
| Aronia arbutifolia | (L.) Pers. | Rosaceae | 8 |
| Artemisia campestris | L. | Asteraceae | 8 |
| Artemisia carruthii | Alph.Wood ex J.H.Carruth | Asteraceae | 8 |
| Artemisia dracunculus | L. | Asteraceae | 8 |
| Artemisia filifolia | Torr. | Asteraceae | 8 |
| Artemisia frigida | Willd. | Asteraceae | 8 |
| Artemisia ludoviciana | Nutt. | Asteraceae | 8 |
| Asarum canadense | L. | Aristolochiaceae | 8 |
| Asarum reflexum | E.P.Bicknell | Aristolochiaceae | 8 |
| Asclepias amplexicaulis | Sm. | Apocynaceae | 8 |
| Asclepias arenaria | Torr. | Apocynaceae | 8 |
| Asclepias asperula | (Decne.) Woodson | Apocynaceae | 8 |
| Asclepias engelmanniana | Woodson | Apocynaceae | 8 |
| Asclepias hirtella | (Pennell) Woodson | Apocynaceae | 8 |
| Asclepias incarnata | L. | Apocynaceae | 8 |
| Asclepias latifolia | (Torr.) Raf. | Apocynaceae | 8 |
| Asclepias meadii | Torr. ex A.Gray | Apocynaceae | 8 |
| Asclepias pumila | (A.Gray) Vail | Apocynaceae | 8 |
| Asclepias purpurascens | L. | Apocynaceae | 8 |
| Asclepias quadrifolia | Jacq. | Apocynaceae | 8 |
| Asclepias speciosa | Torr. | Apocynaceae | 8 |
| Asclepias stenophylla | A.Gray | Apocynaceae | 8 |
| Asclepias subverticillata | (A.Gray) Vail | 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 |
| Asclepias viridis | Walter | Apocynaceae | 8 |
| Asimina triloba | (L.) Dunal | Annonaceae | 8 |
| Asplenium platyneuron | (L.) Britton, Sterns & Poggenb. | Aspleniaceae | 8 |
| Asplenium resiliens | Kunze | Aspleniaceae | 8 |
| Asplenium rhizophyllum | L. | Aspleniaceae | 8 |
| Asplenium trichomanes | L. | Aspleniaceae | 8 |
| Astragalus bisulcatus | (Hook.) A.Gray | Fabaceae | 8 |
| Astragalus canadensis | L. | Fabaceae | 8 |
| Astragalus ceramicus | E.Sheld. | Fabaceae | 8 |
| Astragalus crassicarpus | Nutt. | Fabaceae | 8 |
| Astragalus distortus | Torr. & A.Gray | Fabaceae | 8 |
| Astragalus gracilis | Nutt. | Fabaceae | 8 |
| Astragalus hyalinus | M.E.Jones | Fabaceae | 8 |
| Astragalus lotiflorus | Hook. | Fabaceae | 8 |
| Astragalus missouriensis | Nutt. | Fabaceae | 8 |
| Astragalus mollissimus | Torr. | Fabaceae | 8 |
| Astragalus nuttallianus | DC. | Fabaceae | 8 |
| Astragalus pectinatus | (Hook.) Douglas ex G.Don | Fabaceae | 8 |
| Astragalus plattensis | Nutt. | Fabaceae | 8 |
| Astragalus racemosus | Pursh | Fabaceae | 8 |
| Astragalus sericoleucus | A.Gray | Fabaceae | 8 |
| Astragalus spatulatus | E.Sheld. | Fabaceae | 8 |
| Astranthium ciliatum | (Raf.) G.L.Nesom | Asteraceae | 8 |
| Athyrium asplenioides | (Michx.) Desv. | Athyriaceae | 8 |
| Atriplex argentea | Nutt. | Chenopodiaceae | 8 |
| Atriplex canescens | (Pursh) Nutt. | Chenopodiaceae | 8 |
| Atriplex patula | L. | Chenopodiaceae | 8 |
| Aureolaria grandiflora | (Benth.) Pennell | Orobanchaceae | 8 |
| Azolla caroliniana | Willd. | Salviniaceae | 8 |
| Azolla filiculoides | Lam. | Salviniaceae | 8 |
| Baccharis salicina | Torr. & A.Gray | Asteraceae | 8 |
| Baccharis wrightii | A.Gray | Asteraceae | 8 |
| Baptisia australis | (L.) R.Br. | Fabaceae | 8 |
| Baptisia lactea | (Raf.) Thieret | Fabaceae | 8 |
| Baptisia leucophaea | Nutt. | Fabaceae | 8 |
| Beckmannia syzigachne | (Steud.) Fernald | Poaceae | 8 |
| Berlandiera lyrata | Benth. | Asteraceae | 8 |
| Berlandiera texana | DC. | Asteraceae | 8 |
| Berula erecta | (Huds.) Coville | Apiaceae | 8 |
| Betula nigra | L. | Betulaceae | 8 |
| Betula pumila | L. | Betulaceae | 8 |
| Bidens bipinnata | L. | Asteraceae | 8 |
| Bidens cernua | L. | Asteraceae | 8 |
| Bidens connata | Muhl. ex Willd. | Asteraceae | 8 |
| Bidens frondosa | L. | Asteraceae | 8 |
| Bidens polylepis | S.F.Blake | 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 |
| Bletia spicata | (Walter) Sosa & M.W.Chase | Orchidaceae | 8 |
| Blitum nuttallianum | Schult. | Chenopodiaceae | 8 |
| Boehmeria cylindrica | (L.) Sw. | Urticaceae | 8 |
| Bolboschoenus fluviatilis | (Torr.) Soják | Cyperaceae | 8 |
| Bolboschoenus maritimus | (L.) Palla | 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 |
| Bothriochloa torreyana | (Steud.) Scrivanti & Anton | Poaceae | 8 |
| Botrypus virginianus | (L.) Michx. | Ophioglossaceae | 8 |
| Bouteloua barbata | Lag. | Poaceae | 8 |
| Bouteloua curtipendula | (Michx.) Torr. | Poaceae | 8 |
| Bouteloua dactyloides | (Nutt.) Columbus | Poaceae | 8 |
| Bouteloua eriopoda | (Torr.) Torr. | Poaceae | 8 |
| Bouteloua gracilis | (Kunth) Lag. ex Griffiths | Poaceae | 8 |
| Bouteloua hirsuta | Lag. | Poaceae | 8 |
| Brachyelytrum erectum | (Schreb.) P.Beauv. | Poaceae | 8 |
| Bradburia pilosa | (Nutt.) Semple | Asteraceae | 8 |
| Brasenia schreberi | J.F.Gmel. | Cabombaceae | 8 |
| Brickellia grandiflora | Nutt. | Asteraceae | 8 |
| Bromus latiglumis | (Shear) Hitchc. | Poaceae | 8 |
| Bromus nottowayanus | Fernald | Poaceae | 8 |
| Bromus pubescens | Muhl. ex Willd. | Poaceae | 8 |
| Buchnera americana | L. | Orobanchaceae | 8 |
| Bulbostylis capillaris | (L.) Kunth ex C.B.Clarke | Cyperaceae | 8 |
| Calamagrostis canadensis | (Michx.) P.Beauv. | Poaceae | 8 |
| Calamagrostis inexpansa | A.Gray | Poaceae | 8 |
| Calamagrostis stricta | (Timm) Koeler | Poaceae | 8 |
| Callirhoe alcaeoides | (Michx.) A.Gray | Malvaceae | 8 |
| Callirhoe digitata | Nutt. | Malvaceae | 8 |
| Callirhoe involucrata | (Torr. & A.Gray) A.Gray | Malvaceae | 8 |
| Callirhoe leiocarpa | R.F.Martin | Malvaceae | 8 |
| Callitriche heterophylla | Pursh | Plantaginaceae | 8 |
| Callitriche terrestris | Raf. | Plantaginaceae | 8 |
| Calopogon oklahomensis | D.H.Goldman | Orchidaceae | 8 |
| Calycocarpum lyonii | (Pursh) Nutt. ex A.Gray | Menispermaceae | 8 |
| Calystegia sepium | (L.) R.Br. | Convolvulaceae | 8 |
| Calystegia silvatica | Griseb. | Convolvulaceae | 8 |
| Camassia angusta | (Engelm. & A.Gray) Blank. | Asparagaceae | 8 |
| Camassia scilloides | (Raf.) Cory | Asparagaceae | 8 |
| Campanula americana | L. | Campanulaceae | 8 |
| Campsis radicans | (L.) Bureau | Bignoniaceae | 8 |
| Cardamine bulbosa | (Schreb. ex Muhl.) Britton, Sterns & Poggenb. | Brassicaceae | 8 |
| Cardamine concatenata | (Michx.) O.Schwarz | Brassicaceae | 8 |
| Cardamine parviflora | L. | Brassicaceae | 8 |
| Cardamine pensylvanica | Muhl. ex Willd. | Brassicaceae | 8 |
| Carex albicans | Willd. ex Spreng. | Cyperaceae | 8 |
| Carex annectens | (E.P.Bicknell) E.P.Bicknell | Cyperaceae | 8 |
| Carex aquatilis | Wahlenb. | Cyperaceae | 8 |
| Carex aureolensis | Steud. | Cyperaceae | 8 |
| Carex austrina | Mack. | Cyperaceae | 8 |
| Carex bicknellii | Britton & A.Br. | Cyperaceae | 8 |
| Carex blanda | Dewey | Cyperaceae | 8 |
| Carex brevior | (Dewey) Mack. ex Lunell | Cyperaceae | 8 |
| Carex bushii | Mack. | Cyperaceae | 8 |
| Carex buxbaumii | Wahlenb. | Cyperaceae | 8 |
| Carex caroliniana | Schwein. | Cyperaceae | 8 |
| Carex cephalophora | Muhl. ex Willd. | Cyperaceae | 8 |
| Carex conjuncta | Boott | Cyperaceae | 8 |
| Carex corrugata | Fernald | Cyperaceae | 8 |
| Carex crawei | Dewey ex Torr. | Cyperaceae | 8 |
| Carex cristatella | Britton | Cyperaceae | 8 |
| Carex crus-corvi | Shuttlew. ex Kunze | Cyperaceae | 8 |
| Carex davisii | Schwein. & Torr. | Cyperaceae | 8 |
| Carex duriuscula | C.A.Mey. | Cyperaceae | 8 |
| Carex emoryi | Dewey | Cyperaceae | 8 |
| Carex festucacea | Willd. | Cyperaceae | 8 |
| Carex filifolia | Nutt. | Cyperaceae | 8 |
| Carex flaccosperma | Dewey | Cyperaceae | 8 |
| Carex frankii | Kunth | 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 hirsutella | Mack. | Cyperaceae | 8 |
| Carex hirtifolia | Mack. | Cyperaceae | 8 |
| Carex hitchcockiana | Dewey | Cyperaceae | 8 |
| Carex hyalinolepis | Steud. | Cyperaceae | 8 |
| Carex hystericina | Muhl. ex Willd. | Cyperaceae | 8 |
| Carex inops | L.H.Bailey | Cyperaceae | 8 |
| Carex interior | L.H.Bailey | Cyperaceae | 8 |
| Carex jamesii | Schwein. | Cyperaceae | 8 |
| Carex leavenworthii | Dewey | Cyperaceae | 8 |
| Carex lupulina | Muhl. ex Willd. | Cyperaceae | 8 |
| Carex meadii | Dewey | Cyperaceae | 8 |
| Carex microdonta | Torr. | 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 pellita | Muhl. ex Willd. | Cyperaceae | 8 |
| Carex praegracilis | W.Boott | Cyperaceae | 8 |
| Carex radiata | (Wahlenb.) Small | Cyperaceae | 8 |
| Carex retroflexa | Muhl. ex Willd. | Cyperaceae | 8 |
| Carex rosea | Willd. | Cyperaceae | 8 |
| Carex scoparia | Schkuhr ex Willd. | Cyperaceae | 8 |
| Carex shortiana | Dewey & Torr. | Cyperaceae | 8 |
| Carex sparganioides | Muhl. ex Willd. | Cyperaceae | 8 |
| Carex squarrosa | L. | Cyperaceae | 8 |
| Carex stipata | Muhl. ex Willd. | Cyperaceae | 8 |
| Carex stricta | Lam. | Cyperaceae | 8 |
| Carex swanii | (Fernald) Mack. | Cyperaceae | 8 |
| Carex tenera | Dewey | Cyperaceae | 8 |
| Carex texensis | (Torr. ex L.H.Bailey) L.H.Bailey | Cyperaceae | 8 |
| Carex tribuloides | Wahlenb. | Cyperaceae | 8 |
| Carex umbellata | Willd. | Cyperaceae | 8 |
| Carex vulpinoidea | Michx. | Cyperaceae | 8 |
| Carpinus caroliniana | Walter | Betulaceae | 8 |
| Carya cordiformis | (Wangenh.) K.Koch | Juglandaceae | 8 |
| Carya glabra | (Mill.) Sweet | Juglandaceae | 8 |
| Carya illinoinensis | (Wangenh.) K.Koch | Juglandaceae | 8 |
| Carya laciniosa | (F.Michx.) G.Don | Juglandaceae | 8 |
| Carya ovata | (Mill.) K.Koch | Juglandaceae | 8 |
| Carya texana | Buckley | Juglandaceae | 8 |
| Carya tomentosa | (Lam.) Nutt. | Juglandaceae | 8 |
| Castilleja citrina | Pennell | Orobanchaceae | 8 |
| Castilleja coccinea | (L.) Spreng. | Orobanchaceae | 8 |
| Castilleja purpurea | (Nutt.) G.Don | Orobanchaceae | 8 |
| Castilleja sessiliflora | Pursh | Orobanchaceae | 8 |
| Catalpa speciosa | (Warder) Engelm. | Bignoniaceae | 8 |
| Caulophyllum thalictroides | (L.) Michx. | Berberidaceae | 8 |
| Ceanothus americanus | L. | Rhamnaceae | 8 |
| Ceanothus herbaceus | Raf. | Rhamnaceae | 8 |
| Celastrus scandens | L. | Celastraceae | 8 |
| Celtis laevigata | Willd. | Cannabaceae | 8 |
| Celtis occidentalis | L. | Cannabaceae | 8 |
| Celtis reticulata | Torr. | Cannabaceae | 8 |
| Celtis tenuifolia | Nutt. | Cannabaceae | 8 |
| Cenchrus echinatus | L. | Poaceae | 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 |
| Chaerophyllum tainturieri | Hook. | Apiaceae | 8 |
| Chaetopappa asteroides | (Nutt.) DC. | Asteraceae | 8 |
| Chaetopappa ericoides | (Torr.) G.L.Nesom | Asteraceae | 8 |
| Chamaecrista fasciculata | (Michx.) Greene | Fabaceae | 8 |
| Chamaecrista nictitans | (L.) Moench | Fabaceae | 8 |
| Chamaesaracha coniodes | (Moric. ex Dunal) Benth. & Hook.f. ex B.D.Jacks. | Solanaceae | 8 |
| Chasmanthium latifolium | (Michx.) H.O.Yates | Poaceae | 8 |
| Chenopodium berlandieri | Moq. | Chenopodiaceae | 8 |
| Chenopodium fremontii | S.Watson | Chenopodiaceae | 8 |
| Chenopodium incanum | (S.Watson) A.Heller | Chenopodiaceae | 8 |
| Chenopodium leptophyllum | (Nutt. ex Moq.) B.D.Jacks. | Chenopodiaceae | 8 |
| Chenopodium rubrum | L. | Chenopodiaceae | 8 |
| Chloris cucullata | Bisch. | Poaceae | 8 |
| Chloris verticillata | Nutt. | Poaceae | 8 |
| Chloris virgata | Sw. | Poaceae | 8 |
| Chrysopsis villosa | (Pursh) Nutt. ex DC. | Asteraceae | 8 |
| Cicuta bulbifera | L. | Apiaceae | 8 |
| Cicuta maculata | L. | Apiaceae | 8 |
| Cinna arundinacea | L. | Poaceae | 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 ochrocentrum | A.Gray | Asteraceae | 8 |
| Cirsium undulatum | (Nutt.) Spreng. | Asteraceae | 8 |
| Cissus trifoliata | (L.) L. | Vitaceae | 8 |
| Claytonia virginica | L. | Montiaceae | 8 |
| Clematis catesbyana | Pursh | Ranunculaceae | 8 |
| Clematis fremontii | S.Watson | Ranunculaceae | 8 |
| Clematis pitcheri | Torr. & A.Gray | Ranunculaceae | 8 |
| Clematis virginiana | L. | Ranunculaceae | 8 |
| Cleome dodecandra | L. | Cleomaceae | 8 |
| Cleomella serrulata | (Pursh) Roalson & J.C.Hall | Cleomaceae | 8 |
| Clinopodium arkansanum | (Nutt.) House | Lamiaceae | 8 |
| Clitoria mariana | L. | Fabaceae | 8 |
| Coleataenia anceps | (Michx.) Soreng | Poaceae | 8 |
| Coleataenia rigidula | (Bosc ex Nees) LeBlond | Poaceae | 8 |
| Collinsia verna | Nutt. | Plantaginaceae | 8 |
| Collinsia violacea | Nutt. | Plantaginaceae | 8 |
| Comandra umbellata | (L.) Nutt. | Santalaceae | 8 |
| Commelina erecta | L. | Commelinaceae | 8 |
| Commelina virginica | L. | Commelinaceae | 8 |
| Conoclinium coelestinum | DC. | Asteraceae | 8 |
| Convolvulus equitans | Benth. | Convolvulaceae | 8 |
| Conyza ramosissima | Cronquist | Asteraceae | 8 |
| Corallorhiza odontorhiza | (Willd.) Nutt. | Orchidaceae | 8 |
| Corallorhiza wisteriana | Conrad | Orchidaceae | 8 |
| Coreopsis grandiflora | Hogg ex Sweet | Asteraceae | 8 |
| Coreopsis lanceolata | L. | Asteraceae | 8 |
| Coreopsis pubescens | Elliott | Asteraceae | 8 |
| Coreopsis tinctoria | Nutt. | Asteraceae | 8 |
| Coreopsis tripteris | L. | Asteraceae | 8 |
| Cornus drummondii | C.A.Mey. | Cornaceae | 8 |
| Cornus florida | L. | Cornaceae | 8 |
| Cornus obliqua | Raf. | Cornaceae | 8 |
| Cornus sericea | L. | Cornaceae | 8 |
| Corydalis aurea | Willd. | Papaveraceae | 8 |
| Corydalis curvisiliqua | (A.Gray) Engelm. ex A.Gray | Papaveraceae | 8 |
| Corydalis flavula | (Raf.) DC. | Papaveraceae | 8 |
| Corydalis micrantha | (Engelm. ex A.Gray) A.Gray ex J.M.Coult. | Papaveraceae | 8 |
| Corylus americana | Walter | Betulaceae | 8 |
| Crataegus berberifolia | Torr. & A.Gray | Rosaceae | 8 |
| Crataegus calpodendron | (Ehrh.) Medik. | Rosaceae | 8 |
| Crataegus coccinioides | Ashe | Rosaceae | 8 |
| Crataegus crus-galli | L. | Rosaceae | 8 |
| Crataegus macracantha | (Lindl.) Lodd. ex Loudon | Rosaceae | 8 |
| Crataegus mollis | (Torr. & A.Gray) Scheele | Rosaceae | 8 |
| Crataegus pruinosa | (H.L.Wendl.) K.Koch | Rosaceae | 8 |
| Crataegus viridis | L. | Rosaceae | 8 |
| Crocanthemum bicknellii | (Fernald) Janch. | Cistaceae | 8 |
| Croptilon hookerianum | (Torr. & A.Gray) House | Asteraceae | 8 |
| Crotalaria sagittalis | L. | Fabaceae | 8 |
| Croton capitatus | Michx. | Euphorbiaceae | 8 |
| Croton glandulosus | L. | Euphorbiaceae | 8 |
| Croton lindheimerianus | Scheele | Euphorbiaceae | 8 |
| Croton michauxii | G.L.Webster | Euphorbiaceae | 8 |
| Croton monanthogynus | Michx. | Euphorbiaceae | 8 |
| Croton texensis | (Klotzsch) Müll.Arg. | Euphorbiaceae | 8 |
| Cryptantha crassisepala | (Torr. & A.Gray) Greene | Boraginaceae | 8 |
| Cryptantha minima | Rydb. | Boraginaceae | 8 |
| Cryptotaenia canadensis | (L.) DC. | Apiaceae | 8 |
| Cucurbita foetidissima | Kunth | Cucurbitaceae | 8 |
| Cunila origanoides | (L.) Britton | Lamiaceae | 8 |
| Cuphea viscosissima | Jacq. | Lythraceae | 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 |
| Cuscuta umbellata | Kunth | Convolvulaceae | 8 |
| Cyclanthera naudiniana | Cogn. | Cucurbitaceae | 8 |
| Cylindropuntia imbricata | (Haw.) F.M.Knuth | Cactaceae | 8 |
| Cymopterus glomeratus | (Nutt.) DC. | Apiaceae | 8 |
| Cynanchum laeve | (Michx.) Pers. | Apocynaceae | 8 |
| Cyperus acuminatus | Torr. & Hook. | Cyperaceae | 8 |
| Cyperus bipartitus | Torr. | Cyperaceae | 8 |
| Cyperus diandrus | Torr. | Cyperaceae | 8 |
| Cyperus echinatus | (L.) Alph.Wood | Cyperaceae | 8 |
| Cyperus esculentus | L. | Cyperaceae | 8 |
| Cyperus flavescens | L. | Cyperaceae | 8 |
| Cyperus lupulinus | (Biehler) Marcks | Cyperaceae | 8 |
| Cyperus odoratus | L. | Cyperaceae | 8 |
| Cyperus pseudovegetus | Steud. | Cyperaceae | 8 |
| Cyperus squarrosus | L. | Cyperaceae | 8 |
| Cyperus strigosus | L. | Cyperaceae | 8 |
| Cyperus subsquarrosus | (Muhl.) Bauters | Cyperaceae | 8 |
| Cyperus surinamensis | Rottb. | Cyperaceae | 8 |
| Cypripedium parviflorum | Salisb. | Orchidaceae | 8 |
| Cystopteris fragilis | (L.) Bernh. | Cystopteridaceae | 8 |
| Cystopteris protrusa | (Weath.) Blasdell | Cystopteridaceae | 8 |
| Cystopteris tennesseensis | Shaver | Cystopteridaceae | 8 |
| Cystopteris tenuis | (Michx.) Desv. | Cystopteridaceae | 8 |
| Dalea aurea | Nutt. ex Pursh | Fabaceae | 8 |
| Dalea candida | Willd. | Fabaceae | 8 |
| Dalea cylindriceps | Barneby | Fabaceae | 8 |
| Dalea enneandra | Nutt. | Fabaceae | 8 |
| Dalea lanata | Spreng. | Fabaceae | 8 |
| Dalea leporina | (Aiton) Bullock | Fabaceae | 8 |
| Dalea multiflora | (Nutt.) Shinners | Fabaceae | 8 |
| Dalea nana | Torr. ex A.Gray | Fabaceae | 8 |
| Dalea purpurea | Vent. | Fabaceae | 8 |
| Dalea tenuifolia | (A.Gray) Shinners | Fabaceae | 8 |
| Dalea villosa | (Nutt.) Spreng. | Fabaceae | 8 |
| Danthonia spicata | (L.) Roem. & Schult. | Poaceae | 8 |
| Dasistoma macrophylla | (Nutt.) Raf. | Orobanchaceae | 8 |
| Daucus pusillus | Michx. | Apiaceae | 8 |
| Delphinium carolinianum | Walter | Ranunculaceae | 8 |
| Delphinium tricorne | Michx. | Ranunculaceae | 8 |
| Descurainia pinnata | (Walter) Britton | Brassicaceae | 8 |
| Desmanthus cooleyi | (Eaton) Trel. ex Branner & Coville | Fabaceae | 8 |
| Desmanthus illinoensis | (Michx.) MacMill. ex B.L.Rob. & Fernald | Fabaceae | 8 |
| Desmanthus leptolobus | Torr. & A.Gray | Fabaceae | 8 |
| Desmodium canadense | (L.) DC. | Fabaceae | 8 |
| Desmodium canescens | (L.) DC. | Fabaceae | 8 |
| Desmodium glabellum | (Michx.) DC. | Fabaceae | 8 |
| Desmodium illinoense | A.Gray | Fabaceae | 8 |
| Desmodium sessilifolium | (Torr. ex M.A.Curtis) Torr. & A.Gray | Fabaceae | 8 |
| Dianthera americana | L. | Acanthaceae | 8 |
| Diaperia prolifera | (Nutt. ex DC.) Nutt. | Asteraceae | 8 |
| Diarrhena americana | P.Beauv. | Poaceae | 8 |
| Dicentra cucullaria | (L.) Bernh. | Papaveraceae | 8 |
| Dichanthelium boscii | (Poir.) Gould & C.A.Clark | Poaceae | 8 |
| Dichanthelium clandestinum | (L.) Gould | Poaceae | 8 |
| Dichanthelium depauperatum | (Muhl.) 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 oligosanthes | (Schult.) Gould | Poaceae | 8 |
| Dichanthelium praecocius | (Hitchc. & Chase) Mohlenbr. | Poaceae | 8 |
| Dichanthelium scoparium | (Lam.) Gould | Poaceae | 8 |
| Dichanthelium sphaerocarpon | (Elliott) Gould | Poaceae | 8 |
| Dicliptera brachiata | Spreng. | Acanthaceae | 8 |
| Dieteria canescens | (Pursh) Nutt. | Asteraceae | 8 |
| Digitaria cognata | (Schult.) Pilg. | Poaceae | 8 |
| Digitaria filiformis | (L.) Koeler | Poaceae | 8 |
| Dimorphocarpa candicans | (Raf.) Rollins | Brassicaceae | 8 |
| Diodia virginiana | L. | Rubiaceae | 8 |
| Dioscorea villosa | L. | Dioscoreaceae | 8 |
| Diospyros virginiana | L. | Ebenaceae | 8 |
| Diplachne fusca | (L.) P.Beauv. | Poaceae | 8 |
| Diplaziopsis pycnocarpa | (Spreng.) M.G.Price | Diplaziopsidaceae | 8 |
| Distichlis spicata | (L.) Greene | Poaceae | 8 |
| Ditaxis humilis | (Engelm. & A.Gray) Pax | Euphorbiaceae | 8 |
| Ditaxis mercurialina | (Nutt.) J.M.Coult. | Euphorbiaceae | 8 |
| Drosera brevifolia | Pursh | Droseraceae | 8 |
| Drymocallis arguta | (Pursh) Rydb. | Rosaceae | 8 |
| Dryopteris marginalis | (L.) A.Gray | Dryopteridaceae | 8 |
| Dyssodia papposa | (Vent.) Hitchc. | Asteraceae | 8 |
| Echinacea angustifolia | DC. | Asteraceae | 8 |
| Echinacea atrorubens | (Nutt.) Nutt. | Asteraceae | 8 |
| Echinacea pallida | (Nutt.) Nutt. | Asteraceae | 8 |
| Echinacea purpurea | (L.) Moench | Asteraceae | 8 |
| Echinochloa muricata | (P.Beauv.) Fernald | 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 atropurpurea | (Retz.) J.Presl & C.Presl | Cyperaceae | 8 |
| Eleocharis compressa | Sull. | Cyperaceae | 8 |
| Eleocharis engelmannii | Steud. | Cyperaceae | 8 |
| Eleocharis erythropoda | Steud. | Cyperaceae | 8 |
| Eleocharis macrostachya | Britton | Cyperaceae | 8 |
| Eleocharis montevidensis | Kunth | 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 rostellata | (Torr.) Torr. | Cyperaceae | 8 |
| Elephantopus carolinianus | Raeusch. | Asteraceae | 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 elymoides | (Raf.) Swezey | Poaceae | 8 |
| Elymus hystrix | L. | Poaceae | 8 |
| Elymus longifolius | (J.G.Sm.) Gould | Poaceae | 8 |
| Elymus macgregorii | R.E.Brooks & J.J.N.Campb. | 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 |
| Engelmannia peristenia | (Raf.) Goodman & C.A.Lawson | Asteraceae | 8 |
| Epilobium ciliatum | Raf. | Onagraceae | 8 |
| Epilobium coloratum | Muhl. ex Willd. | Onagraceae | 8 |
| Epilobium leptophyllum | Raf. | Onagraceae | 8 |
| Equisetum arvense | L. | Equisetaceae | 8 |
| Equisetum hyemale | L. | Equisetaceae | 8 |
| Equisetum laevigatum | A.Braun | Equisetaceae | 8 |
| Eragrostis curtipedicellata | Buckley | Poaceae | 8 |
| Eragrostis hypnoides | (Lam.) Britton, Sterns & Poggenb. | Poaceae | 8 |
| Eragrostis intermedia | Hitchc. | Poaceae | 8 |
| Eragrostis pectinacea | (Michx.) Nees | Poaceae | 8 |
| Eragrostis reptans | (Michx.) Nees | Poaceae | 8 |
| Eragrostis secundiflora | J.Presl | Poaceae | 8 |
| Eragrostis sessilispica | Buckley | Poaceae | 8 |
| Eragrostis spectabilis | (Pursh) Steud. | Poaceae | 8 |
| Eragrostis trichodes | (Nutt.) Alph.Wood | Poaceae | 8 |
| Erechtites hieraciifolius | (L.) Raf. ex DC. | Asteraceae | 8 |
| Ericameria nauseosa | (Pursh) G.L.Nesom & G.I.Baird | Asteraceae | 8 |
| Erigenia bulbosa | (Michx.) Nutt. | Apiaceae | 8 |
| Erigeron bellidiastrum | Nutt. | Asteraceae | 8 |
| Erigeron canadensis | L. | Asteraceae | 8 |
| Erigeron flagellaris | A.Gray | Asteraceae | 8 |
| Erigeron modestus | A.Gray | Asteraceae | 8 |
| Erigeron philadelphicus | L. | Asteraceae | 8 |
| Erigeron pulchellus | Michx. | Asteraceae | 8 |
| Erigeron pumilus | Nutt. | Asteraceae | 8 |
| Erigeron strigosus | Muhl. ex Willd. | Asteraceae | 8 |
| Erigeron tracyi | Greene | Asteraceae | 8 |
| Eriochloa contracta | Hitchc. | Poaceae | 8 |
| Eriochloa sericea | (Scheele) Munro ex Vasey | Poaceae | 8 |
| Eriocoma hymenoides | (Roem. & Schult.) Rydb. | Poaceae | 8 |
| Eriogonum alatum | Torr. | Polygonaceae | 8 |
| Eriogonum annuum | Nutt. | Polygonaceae | 8 |
| Eriogonum helichrysoides | (Gand.) Prain | Polygonaceae | 8 |
| Eriogonum jamesii | Benth. | Polygonaceae | 8 |
| Eriogonum lachnogynum | Torr. ex Benth. | Polygonaceae | 8 |
| Eriogonum longifolium | Nutt. | Polygonaceae | 8 |
| Erioneuron pilosum | (Buckley) Nash | Poaceae | 8 |
| Eryngium leavenworthii | Torr. & A.Gray | Apiaceae | 8 |
| Eryngium prostratum | Nutt. ex DC. | Apiaceae | 8 |
| Eryngium yuccifolium | Michx. | Apiaceae | 8 |
| Erysimum asperum | (Nutt.) DC. | Brassicaceae | 8 |
| Erythranthe geyeri | (Torr.) G.L.Nesom | Phrymaceae | 8 |
| Erythronium albidum | Nutt. | Liliaceae | 8 |
| Erythronium mesochoreum | Knerr | Liliaceae | 8 |
| Erythronium rostratum | W.Wolf | Liliaceae | 8 |
| Euonymus atropurpureus | Jacq. | Celastraceae | 8 |
| Eupatorium altissimum | L. | Asteraceae | 8 |
| Eupatorium perfoliatum | L. | Asteraceae | 8 |
| Eupatorium serotinum | Michx. | Asteraceae | 8 |
| Eupatorium sessilifolium | L. | Asteraceae | 8 |
| Euphorbia carunculata | Waterf. | Euphorbiaceae | 8 |
| Euphorbia corollata | L. | Euphorbiaceae | 8 |
| Euphorbia dentata | Michx. | Euphorbiaceae | 8 |
| Euphorbia fendleri | Torr. & A.Gray | 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 humistrata | Engelm. ex A.Gray | Euphorbiaceae | 8 |
| Euphorbia lata | Engelm. | Euphorbiaceae | 8 |
| Euphorbia longicruris | Scheele | Euphorbiaceae | 8 |
| Euphorbia maculata | L. | Euphorbiaceae | 8 |
| Euphorbia marginata | Pursh | Euphorbiaceae | 8 |
| Euphorbia missurica | Raf. | Euphorbiaceae | 8 |
| Euphorbia nutans | Lag. | Euphorbiaceae | 8 |
| Euphorbia prostrata | Aiton | Euphorbiaceae | 8 |
| Euphorbia serpens | Kunth | Euphorbiaceae | 8 |
| Euphorbia spathulata | Lam. | Euphorbiaceae | 8 |
| Euphorbia stictospora | Engelm. | Euphorbiaceae | 8 |
| Euploca convolvulacea | Nutt. | Heliotropiaceae | 8 |
| Euploca tenella | (Torr.) Feuillet & Halse | Heliotropiaceae | 8 |
| Eurybia paludosa | (Aiton) G.L.Nesom | Asteraceae | 8 |
| Eustoma russellianum | (Hook.) G.Don | Gentianaceae | 8 |
| Euthamia gymnospermoides | Greene | Asteraceae | 8 |
| Eutrochium maculatum | (L.) E.E.Lamont | Asteraceae | 8 |
| Eutrochium purpureum | (L.) E.E.Lamont | Asteraceae | 8 |
| Evolvulus nuttallianus | Schult. | Convolvulaceae | 8 |
| Facelis retusa | (Lam.) Sch.Bip. | Asteraceae | 8 |
| Fallopia scandens | (L.) Holub | Polygonaceae | 8 |
| Festuca kingii | (S.Watson) Cassidy | Poaceae | 8 |
| Festuca octoflora | Walter | Poaceae | 8 |
| Festuca rubra | L. | Poaceae | 8 |
| Festuca subverticillata | (Pers.) E.B.Alexeev | Poaceae | 8 |
| Festuca versuta | Beal | Poaceae | 8 |
| Fimbristylis autumnalis | (L.) Roem. & Schult. | Cyperaceae | 8 |
| Fimbristylis dichotoma | (L.) Vahl | Cyperaceae | 8 |
| Fimbristylis puberula | (Michx.) Vahl | Cyperaceae | 8 |
| Fimbristylis vahlii | (Lam.) Link | Cyperaceae | 8 |
| Forestiera acuminata | (Michx.) Poir. | Oleaceae | 8 |
| Fragaria virginiana | Mill. | Rosaceae | 8 |
| Fraxinus americana | L. | Oleaceae | 8 |
| Fraxinus pennsylvanica | Marshall | Oleaceae | 8 |
| Fraxinus quadrangulata | Michx. | Oleaceae | 8 |
| Froelichia floridana | (Nutt.) Moq. | Amaranthaceae | 8 |
| Froelichia gracilis | (Hook.) Moq. | Amaranthaceae | 8 |
| Fuirena simplex | Vahl | Cyperaceae | 8 |
| Gaillardia aestivalis | (Walter) H.Rock | Asteraceae | 8 |
| Gaillardia pulchella | Foug. | Asteraceae | 8 |
| Gaillardia suavis | (A.Gray & Engelm.) Britton & Rusby | Asteraceae | 8 |
| Galactia regularis | (L.) Britton, Sterns & Poggenb. | Fabaceae | 8 |
| Galactia volubilis | (L.) Britton | Fabaceae | 8 |
| Galearis spectabilis | (L.) Raf. | Orchidaceae | 8 |
| Galium obtusum | Bigelow | Rubiaceae | 8 |
| Galium pilosum | Aiton | Rubiaceae | 8 |
| Galium triflorum | Michx. | Rubiaceae | 8 |
| Galium virgatum | Nutt. | Rubiaceae | 8 |
| Gamochaeta argyrinea | G.L.Nesom | Asteraceae | 8 |
| Gamochaeta purpurea | (L.) Cabrera | Asteraceae | 8 |
| Gentiana alba | Muhl. ex J.McNab | Gentianaceae | 8 |
| Gentiana puberulenta | J.S.Pringle | Gentianaceae | 8 |
| Gentianella quinquefolia | (L.) Small | Gentianaceae | 8 |
| Geranium carolinianum | L. | Geraniaceae | 8 |
| Geranium maculatum | L. | Geraniaceae | 8 |
| Geum canadense | Jacq. | Rosaceae | 8 |
| Geum laciniatum | Murray | Rosaceae | 8 |
| Geum vernum | (Raf.) Torr. & A.Gray | Rosaceae | 8 |
| Giliastrum acerosum | (A.Gray) Rydb. | Polemoniaceae | 8 |
| Gillenia stipulata | (Muhl. ex Willd.) Nutt. | Rosaceae | 8 |
| Gleditsia triacanthos | L. | Fabaceae | 8 |
| Glyceria striata | (Lam.) Hitchc. | Poaceae | 8 |
| Glycyrrhiza lepidota | Pursh | Fabaceae | 8 |
| Gnaphalium uliginosum | L. | Asteraceae | 8 |
| Gonolobus suberosus | (L.) R.Br. | Apocynaceae | 8 |
| Gratiola neglecta | Torr. | Plantaginaceae | 8 |
| Gratiola virginiana | L. | Plantaginaceae | 8 |
| Grindelia ciliata | (Nutt.) Spreng. | Asteraceae | 8 |
| Grindelia lanceolata | Nutt. | Asteraceae | 8 |
| Grindelia squarrosa | (Pursh) Dunal | Asteraceae | 8 |
| Gutierrezia dracunculoides | (DC.) O.Hoffm. | Asteraceae | 8 |
| Gutierrezia sarothrae | (Pursh) Britton & Rusby | Asteraceae | 8 |
| Gymnocladus dioicus | (L.) K.Koch | Fabaceae | 8 |
| Gymnopogon ambiguus | (Michx.) Britton, Sterns & Poggenb. | Poaceae | 8 |
| Hackelia virginiana | (L.) I.M.Johnst. | Boraginaceae | 8 |
| Halerpestes cymbalaria | Greene | Ranunculaceae | 8 |
| Hedeoma drummondii | Benth. | Lamiaceae | 8 |
| Hedeoma hispida | Pursh | Lamiaceae | 8 |
| Hedeoma pulegioides | (L.) Pers. | Lamiaceae | 8 |
| Hedysarum boreale | Nutt. | Fabaceae | 8 |
| Helenium amarum | (Raf.) H.Rock | Asteraceae | 8 |
| Helenium autumnale | L. | Asteraceae | 8 |
| Helianthus ciliaris | DC. | 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 nuttallii | Torr. & A.Gray | Asteraceae | 8 |
| Helianthus occidentalis | Riddell | Asteraceae | 8 |
| Helianthus pauciflorus | Nutt. | Asteraceae | 8 |
| Helianthus petiolaris | Nutt. | Asteraceae | 8 |
| Helianthus salicifolius | A.Dietr. | Asteraceae | 8 |
| Helianthus strumosus | L. | Asteraceae | 8 |
| Helianthus tuberosus | L. | Asteraceae | 8 |
| Heliopsis helianthoides | Sweet | Asteraceae | 8 |
| Heliotropium curassavicum | L. | Heliotropiaceae | 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 |
| Heteranthera limosa | (Sw.) Willd. | Pontederiaceae | 8 |
| Heterotheca canescens | (DC.) Shinners | Asteraceae | 8 |
| Heterotheca subaxillaris | (Lam.) Britton & Rusby | Asteraceae | 8 |
| Heuchera richardsonii | R.Br. | Saxifragaceae | 8 |
| Hexasepalum teres | (Walter) J.H.Kirkbr. | Rubiaceae | 8 |
| Hieracium gronovii | L. | Asteraceae | 8 |
| Hieracium longipilum | Torr. ex Hook. | Asteraceae | 8 |
| Hilaria jamesii | (Torr.) Benth. | Poaceae | 8 |
| Hoffmannseggia drepanocarpa | A.Gray | Fabaceae | 8 |
| Hoffmannseggia glauca | (Ortega) Eifert | Fabaceae | 8 |
| Hopia obtusa | (Kunth) Zuloaga & Morrone | Poaceae | 8 |
| Hordeum jubatum | L. | Poaceae | 8 |
| Houstonia pusilla | Schoepf | Rubiaceae | 8 |
| Humulus americanus | Nutt. | Cannabaceae | 8 |
| Humulus neomexicanus | (A.Nelson & Cockerell) Rydb. | Cannabaceae | 8 |
| Hybanthus concolor | Spreng. | Violaceae | 8 |
| Hydrocotyle ranunculoides | L.f. | Araliaceae | 8 |
| Hydrophyllum appendiculatum | Michx. | Hydrophyllaceae | 8 |
| Hydrophyllum virginianum | L. | Hydrophyllaceae | 8 |
| Hylodesmum glutinosum | (Muhl. ex Willd.) H.Ohashi & R.R.Mill | Fabaceae | 8 |
| Hymenopappus filifolius | Hook. | Asteraceae | 8 |
| Hymenopappus flavescens | A.Gray | Asteraceae | 8 |
| Hymenopappus scabiosaeus | L'Hér. | Asteraceae | 8 |
| Hymenopappus tenuifolius | Pursh | Asteraceae | 8 |
| Hymenoxys odorata | DC. | Asteraceae | 8 |
| Hypericum ascyron | L. | Hypericaceae | 8 |
| Hypericum drummondii | (Grev. & Hook.) Torr. & A.Gray | Hypericaceae | 8 |
| Hypericum gymnanthum | Engelm. & A.Gray | Hypericaceae | 8 |
| Hypericum hypericoides | (L.) Crantz | Hypericaceae | 8 |
| Hypericum majus | (A.Gray) Britton | Hypericaceae | 8 |
| Hypericum mutilum | L. | Hypericaceae | 8 |
| Hypericum punctatum | Lam. | Hypericaceae | 8 |
| Hypericum sphaerocarpum | Michx. | Hypericaceae | 8 |
| Hypopitys monotropa | Crantz | Ericaceae | 8 |
| Hypoxis hirsuta | (L.) Coville | Hypoxidaceae | 8 |
| Ilex decidua | Walter | Aquifoliaceae | 8 |
| Impatiens capensis | Meerb. | Balsaminaceae | 8 |
| Impatiens pallida | Nutt. | Balsaminaceae | 8 |
| Indigofera miniata | Ortega | Fabaceae | 8 |
| Iodanthus pinnatifidus | Steud. | Brassicaceae | 8 |
| Ionactis linariifolia | (L.) Greene | Asteraceae | 8 |
| Ipomoea coccinea | L. | Convolvulaceae | 8 |
| Ipomoea lacunosa | L. | Convolvulaceae | 8 |
| Ipomoea leptophylla | Torr. | Convolvulaceae | 8 |
| Ipomoea pandurata | G.Mey. | Convolvulaceae | 8 |
| Ipomopsis laxiflora | (J.M.Coult.) V.E.Grant | Polemoniaceae | 8 |
| Ipomopsis longiflora | (Torr.) V.E.Grant | Polemoniaceae | 8 |
| Ipomopsis rubra | (L.) Wherry | Polemoniaceae | 8 |
| Ipomopsis spicata | (Nutt.) V.E.Grant | Polemoniaceae | 8 |
| Iris brevicaulis | Raf. | Iridaceae | 8 |
| Iris virginica | L. | Iridaceae | 8 |
| Isoetes butleri | Engelm. | Isoetaceae | 8 |
| Isolepis carinata | Hook. & Arn. ex Torr. | Cyperaceae | 8 |
| Iva annua | L. | Asteraceae | 8 |
| Iva axillaris | Pursh | Asteraceae | 8 |
| Juglans microcarpa | Berland. | Juglandaceae | 8 |
| Juglans nigra | L. | Juglandaceae | 8 |
| Juncus acuminatus | Michx. | Juncaceae | 8 |
| Juncus anthelatus | (Wiegand) R.E.Brooks & Whittem. | Juncaceae | 8 |
| Juncus balticus | Willd. | Juncaceae | 8 |
| Juncus biflorus | Elliott | Juncaceae | 8 |
| Juncus brachycarpus | Engelm. | Juncaceae | 8 |
| Juncus bufonius | L. | Juncaceae | 8 |
| Juncus diffusissimus | Buckley | Juncaceae | 8 |
| Juncus dudleyi | Wiegand | Juncaceae | 8 |
| Juncus effusus | L. | Juncaceae | 8 |
| Juncus gerardi | Loisel. | Juncaceae | 8 |
| Juncus interior | Wiegand | Juncaceae | 8 |
| Juncus marginatus | Rostk. | Juncaceae | 8 |
| Juncus scirpoides | Lam. | Juncaceae | 8 |
| Juncus tenuis | Willd. | Juncaceae | 8 |
| Juncus torreyi | Coville | Juncaceae | 8 |
| Juncus validus | Coville | Juncaceae | 8 |
| Juniperus virginiana | L. | Cupressaceae | 8 |
| Kallstroemia parviflora | Norton | Zygophyllaceae | 8 |
| Koeleria macrantha | (Ledeb.) Schult. | Poaceae | 8 |
| Krameria lanceolata | Torr. | Krameriaceae | 8 |
| Krascheninnikovia ceratoides | (L.) Gueldenst. | Chenopodiaceae | 8 |
| Krigia biflora | (Walter) S.F.Blake | Asteraceae | 8 |
| Krigia cespitosa | (Raf.) K.L.Chambers | Asteraceae | 8 |
| Krigia dandelion | (L.) Nutt. | Asteraceae | 8 |
| Krigia occidentalis | Nutt. | Asteraceae | 8 |
| Lactuca canadensis | L. | Asteraceae | 8 |
| Lactuca floridana | (L.) Gaertn. | Asteraceae | 8 |
| Lactuca ludoviciana | (Nutt.) Riddell | Asteraceae | 8 |
| Lactuca oblongifolia | Nutt. | Asteraceae | 8 |
| Ladeania lanceolata | (Pursh) Reveal & A.N.Egan | Fabaceae | 8 |
| Laportea canadensis | (L.) Wedd. | Urticaceae | 8 |
| Lappula occidentalis | (S.Watson) Greene | Boraginaceae | 8 |
| Lathyrus decaphyllus | Pursh | Fabaceae | 8 |
| Lathyrus pusillus | Elliott | Fabaceae | 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 minuta | Kunth | Araceae | 8 |
| Lemna trisulca | L. | Araceae | 8 |
| Lemna turionifera | Landolt | Araceae | 8 |
| Lepidium austrinum | Small | Brassicaceae | 8 |
| Lepidium densiflorum | Schrad. | Brassicaceae | 8 |
| Lepidium oblongum | Small | Brassicaceae | 8 |
| Lepidium virginicum | L. | Brassicaceae | 8 |
| Leptochloa panicea | (Retz.) Ohwi | Poaceae | 8 |
| Lespedeza capitata | Michx. | Fabaceae | 8 |
| Lespedeza repens | (L.) W.P.C.Barton | Fabaceae | 8 |
| Lespedeza violacea | (L.) Pers. | Fabaceae | 8 |
| Lespedeza virginica | (L.) Britton | Fabaceae | 8 |
| Leucospora multifida | (Michx.) Nutt. | Plantaginaceae | 8 |
| Liatris aspera | Michx. | Asteraceae | 8 |
| Liatris cylindracea | Michx. | Asteraceae | 8 |
| Liatris punctata | Hook. | Asteraceae | 8 |
| Liatris pycnostachya | Michx. | Asteraceae | 8 |
| Liatris spicata | (L.) Willd. | Asteraceae | 8 |
| Liatris squarrosa | (L.) Willd. | Asteraceae | 8 |
| Lilium michiganense | Farw. | Liliaceae | 8 |
| Limnosciadium pinnatum | (DC.) Mathias & Constance | Apiaceae | 8 |
| Lindera benzoin | (L.) Blume | Lauraceae | 8 |
| Lindernia dubia | (L.) Pennell | Linderniaceae | 8 |
| Linum berlandieri | Hook. | Linaceae | 8 |
| Linum compactum | A.Nelson | Linaceae | 8 |
| Linum hudsonioides | Planch. | Linaceae | 8 |
| Linum lewisii | Pursh | Linaceae | 8 |
| Linum medium | (Planch.) Britton | Linaceae | 8 |
| Linum pratense | (Norton) Small | Linaceae | 8 |
| Linum rigidum | Pursh | Linaceae | 8 |
| Linum sulcatum | Riddell | Linaceae | 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 |
| Lobelia appendiculata | A.DC. | Campanulaceae | 8 |
| Lobelia cardinalis | L. | Campanulaceae | 8 |
| Lobelia inflata | L. | Campanulaceae | 8 |
| Lobelia siphilitica | L. | Campanulaceae | 8 |
| Lobelia spicata | Lam. | Campanulaceae | 8 |
| Loeflingia squarrosa | Nutt. | Caryophyllaceae | 8 |
| Lomatium foeniculaceum | (Nutt.) J.M.Coult. & Rose | Apiaceae | 8 |
| Lomatium orientale | J.M.Coult. & Rose | Apiaceae | 8 |
| Lonicera dioica | L. | Caprifoliaceae | 8 |
| Lonicera flava | Sims | Caprifoliaceae | 8 |
| Lonicera sempervirens | L. | Caprifoliaceae | 8 |
| Lorandersonia baileyi | (Wooton & Standl.) Urbatsch, R.P.Roberts & Neubig | Asteraceae | 8 |
| Ludwigia alternifolia | L. | Onagraceae | 8 |
| Ludwigia palustris | (L.) Elliott | Onagraceae | 8 |
| Ludwigia peploides | (Kunth) P.H.Raven | Onagraceae | 8 |
| Ludwigia repens | J.R.Forst. | Onagraceae | 8 |
| Lupinus pusillus | Pursh | Fabaceae | 8 |
| Luzula bulbosa | (Alph.Wood) Smyth & L.C.R.Smyth | Juncaceae | 8 |
| Luzula echinata | (Small) F.J.Herm. | Juncaceae | 8 |
| Lycopodiella appressa | (Chapm.) Cranfill | Lycopodiaceae | 8 |
| Lycopus americanus | Muhl. ex W.P.C.Barton | Lamiaceae | 8 |
| Lycopus asper | Greene | Lamiaceae | 8 |
| Lycopus rubellus | Moench | Lamiaceae | 8 |
| Lycopus uniflorus | Michx. | Lamiaceae | 8 |
| Lycopus virginicus | L. | Lamiaceae | 8 |
| Lygodesmia juncea | (Pursh) Sweet | Asteraceae | 8 |
| Lysimachia ciliata | L. | Primulaceae | 8 |
| Lysimachia hybrida | Michx. | Primulaceae | 8 |
| Lysimachia minima | (L.) U.Manns & Anderb. | Primulaceae | 8 |
| Lysimachia thyrsiflora | L. | Primulaceae | 8 |
| Lythrum alatum | Pursh | Lythraceae | 8 |
| Lythrum californicum | Torr. & A.Gray | Lythraceae | 8 |
| Machaeranthera tanacetifolia | (Kunth) Nees | Asteraceae | 8 |
| Maianthemum racemosum | (L.) Link | Asparagaceae | 8 |
| Maianthemum stellatum | (L.) Link | Asparagaceae | 8 |
| Malaxis unifolia | Michx. | Orchidaceae | 8 |
| Malus coronaria | (L.) Mill. | Rosaceae | 8 |
| Malus ioensis | (Alph.Wood) Britton | Rosaceae | 8 |
| Malvastrum hispidum | (Pursh) Hochr. | Malvaceae | 8 |
| Malvella leprosa | (Ortega) Krapov. | Malvaceae | 8 |
| Marshallia caespitosa | Nutt. ex DC. | Asteraceae | 8 |
| Marsilea vestita | Hook. & Grev. | Marsileaceae | 8 |
| Matricaria discoidea | DC. | Asteraceae | 8 |
| Mecardonia acuminata | (Walter) Small | Plantaginaceae | 8 |
| Melampodium leucanthum | Torr. & A.Gray | Asteraceae | 8 |
| Melanthium virginicum | L. | Melanthiaceae | 8 |
| Melica nitens | (Scribn.) Nutt. ex Piper | Poaceae | 8 |
| Melothria pendula | L. | Cucurbitaceae | 8 |
| Menispermum canadense | L. | Menispermaceae | 8 |
| Mentha canadensis | L. | Lamiaceae | 8 |
| Mentzelia decapetala | (Sims) Urb. | Loasaceae | 8 |
| Mentzelia nuda | (Pursh) Torr. & A.Gray | Loasaceae | 8 |
| Mentzelia oligosperma | Nutt. ex Sims | Loasaceae | 8 |
| Mertensia virginica | (L.) Pers. ex Link | Boraginaceae | 8 |
| Micranthes texana | (Buckley) Small | Saxifragaceae | 8 |
| Mimosa borealis | A.Gray | Fabaceae | 8 |
| Mimosa nuttallii | (Raspail) B.L.Turner | Fabaceae | 8 |
| Mimulus alatus | Aiton | Phrymaceae | 8 |
| Mimulus ringens | L. | Phrymaceae | 8 |
| Mirabilis albida | (Walter) Heimerl | Nyctaginaceae | 8 |
| Mirabilis glabra | (S.Watson) Standl. | Nyctaginaceae | 8 |
| Mirabilis linearis | (Pursh) Heimerl | Nyctaginaceae | 8 |
| Mollugo verticillata | L. | Molluginaceae | 8 |
| Monarda bradburyana | L.C.Beck | Lamiaceae | 8 |
| Monarda citriodora | Cerv. ex Lag. | Lamiaceae | 8 |
| Monarda clinopodioides | A.Gray | Lamiaceae | 8 |
| Monarda fistulosa | L. | Lamiaceae | 8 |
| Monarda pectinata | Nutt. | Lamiaceae | 8 |
| Monarda punctata | L. | Lamiaceae | 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 alopecuroides | (Griseb.) P.M.Peterson & Columbus | Poaceae | 8 |
| Muhlenbergia arenicola | Buckley | Poaceae | 8 |
| Muhlenbergia asperifolia | (Nees & Meyen ex Trin.) Parodi | Poaceae | 8 |
| Muhlenbergia bushii | R.W.Pohl | Poaceae | 8 |
| Muhlenbergia capillaris | (Lam.) Trin. | Poaceae | 8 |
| Muhlenbergia cuspidata | (Torr. ex Hook.) Rydb. | Poaceae | 8 |
| Muhlenbergia frondosa | (Poir.) Fernald | Poaceae | 8 |
| Muhlenbergia mexicana | (L.) Trin. | Poaceae | 8 |
| Muhlenbergia multiflora | Columbus | Poaceae | 8 |
| Muhlenbergia paniculata | (Nutt.) P.M.Peterson | Poaceae | 8 |
| Muhlenbergia racemosa | (Michx.) Britton, Sterns & Poggenb. | Poaceae | 8 |
| Muhlenbergia schreberi | J.F.Gmel. | Poaceae | 8 |
| Muhlenbergia sylvatica | Torr. | Poaceae | 8 |
| Muhlenbergia torreyi | (Kunth) Hitchc. ex Bush | Poaceae | 8 |
| Munroa squarrosa | (Nutt.) Torr. | Poaceae | 8 |
| Myosotis verna | Nutt. | Boraginaceae | 8 |
| Myriophyllum heterophyllum | Michx. | Haloragaceae | 8 |
| Myriophyllum pinnatum | (Walter) Britton, Sterns & Poggenb. | Haloragaceae | 8 |
| Myriophyllum sibiricum | Kom. | Haloragaceae | 8 |
| Myriopteris alabamensis | (Buckley) Grusz & Windham | Pteridaceae | 8 |
| Myriopteris lanosa | (Michx.) Grusz & Windham | Pteridaceae | 8 |
| Myriopteris tomentosa | (Link) Fée | Pteridaceae | 8 |
| Najas guadalupensis | (Spreng.) Magnus | Hydrocharitaceae | 8 |
| Nama stevensii | C.L.Hitchc. | Namaceae | 8 |
| Nassella viridula | (Trin.) Barkworth | Poaceae | 8 |
| Neltuma glandulosa | (Torr.) Britton & Rose | Fabaceae | 8 |
| Nelumbo lutea | (Willd.) Pers. | Nelumbonaceae | 8 |
| Nemastylis geminiflora | Nutt. | Iridaceae | 8 |
| Nephroia carolina | (L.) L.Lian & Wei Wang | Menispermaceae | 8 |
| Neptunia lutea | (Leavenw.) Benth. | Fabaceae | 8 |
| Nothocalais cuspidata | (Pursh) Greene | Asteraceae | 8 |
| Nothoscordum bivalve | (L.) Britton | Amaryllidaceae | 8 |
| Nuphar advena | (Aiton) W.T.Aiton | Nymphaeaceae | 8 |
| Nuttallanthus canadensis | (L.) D.A.Sutton | Plantaginaceae | 8 |
| Nuttallanthus texanus | (Scheele) D.A.Sutton | Plantaginaceae | 8 |
| Nymphaea odorata | Aiton | Nymphaeaceae | 8 |
| Nyssa sylvatica | Marshall | Nyssaceae | 8 |
| Odontostephana decipiens | Alexander | Apocynaceae | 8 |
| Oenothera albicaulis | Nutt. ex Pursh | Onagraceae | 8 |
| Oenothera biennis | L. | Onagraceae | 8 |
| Oenothera canescens | Torr. | Onagraceae | 8 |
| Oenothera capillifolia | Scheele | Onagraceae | 8 |
| Oenothera cinerea | (Wooton & Standl.) W.L.Wagner & Hoch | Onagraceae | 8 |
| Oenothera curtiflora | W.L.Wagner & Hoch | Onagraceae | 8 |
| Oenothera elata | Kunth | Onagraceae | 8 |
| Oenothera engelmannii | (Small) Munz | Onagraceae | 8 |
| Oenothera filiformis | (Small) W.L.Wagner & Hoch | Onagraceae | 8 |
| Oenothera glaucifolia | W.L.Wagner & Hoch | Onagraceae | 8 |
| Oenothera grandis | Smyth | Onagraceae | 8 |
| Oenothera hartwegii | Benth. | Onagraceae | 8 |
| Oenothera howardii | (A.Nelson) M.E.Jones ex Prain | Onagraceae | 8 |
| Oenothera jamesii | Torr. & A.Gray | Onagraceae | 8 |
| Oenothera laciniata | Hill | Onagraceae | 8 |
| Oenothera lavandulifolia | Torr. & A.Gray | Onagraceae | 8 |
| Oenothera linifolia | Nutt. | Onagraceae | 8 |
| Oenothera macrocarpa | Nutt. | Onagraceae | 8 |
| Oenothera pallida | Lindl. | Onagraceae | 8 |
| Oenothera rhombipetala | Nutt. ex Torr. & A.Gray | Onagraceae | 8 |
| Oenothera serrulata | Nutt. | Onagraceae | 8 |
| Oenothera speciosa | Nutt. | Onagraceae | 8 |
| Oenothera suffrutescens | (Ser.) W.L.Wagner & Hoch | Onagraceae | 8 |
| Oenothera triloba | Nutt. | Onagraceae | 8 |
| Oenothera villosa | Thunb. | Onagraceae | 8 |
| Onoclea sensibilis | L. | Onocleaceae | 8 |
| Ophioglossum engelmannii | Prantl | Ophioglossaceae | 8 |
| Ophioglossum vulgatum | L. | Ophioglossaceae | 8 |
| Opuntia cymochila | Engelm. & J.M.Bigelow | Cactaceae | 8 |
| Opuntia fragilis | (Nutt.) Haw. | Cactaceae | 8 |
| Opuntia macrorhiza | Engelm. | Cactaceae | 8 |
| Opuntia phaeacantha | Engelm. | Cactaceae | 8 |
| Opuntia polyacantha | Haw. | Cactaceae | 8 |
| Opuntia tortispina | Engelm. & J.M.Bigelow | Cactaceae | 8 |
| Orbexilum pedunculatum | (Mill.) Rydb. | Fabaceae | 8 |
| Oreocarya suffruticosa | (Torr.) Greene | Boraginaceae | 8 |
| Oreocarya thyrsiflora | Greene | Boraginaceae | 8 |
| Orobanche fasciculata | Nutt. | Orobanchaceae | 8 |
| Orobanche ludoviciana | Nutt. | Orobanchaceae | 8 |
| Orobanche uniflora | L. | Orobanchaceae | 8 |
| Osmorhiza claytonii | C.B.Clarke | Apiaceae | 8 |
| Osmorhiza longistylis | DC. | Apiaceae | 8 |
| Osmunda spectabilis | Willd. | Osmundaceae | 8 |
| Ostrya virginiana | (Mill.) K.Koch | Betulaceae | 8 |
| Oxalis dillenii | Jacq. | Oxalidaceae | 8 |
| Oxalis stricta | L. | Oxalidaceae | 8 |
| Oxalis violacea | L. | Oxalidaceae | 8 |
| Oxybaphus nyctagineus | (Michx.) Sweet | Nyctaginaceae | 8 |
| Oxytropis lambertii | Pursh | Fabaceae | 8 |
| Oxytropis sericea | Nutt. | Fabaceae | 8 |
| Packera cana | (Hook.) W.A.Weber & Á.Löve | Asteraceae | 8 |
| Packera glabella | (Poir.) C.Jeffrey | Asteraceae | 8 |
| Packera plattensis | (Nutt.) W.A.Weber & Á.Löve | Asteraceae | 8 |
| Packera pseudaurea | (Rydb.) W.A.Weber & Á.Löve | Asteraceae | 8 |
| Packera tampicana | (DC.) C.Jeffrey | Asteraceae | 8 |
| Palafoxia rosea | (Bush) Cory | Asteraceae | 8 |
| Palafoxia sphacelata | (Nutt. ex Torr.) Cory | Asteraceae | 8 |
| Panax quinquefolius | 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 |
| Paronychia canadensis | (L.) Alph.Wood | Caryophyllaceae | 8 |
| Paronychia fastigiata | (Raf.) Fernald | Caryophyllaceae | 8 |
| Paronychia jamesii | Torr. & A.Gray | Caryophyllaceae | 8 |
| Parthenium integrifolium | L. | Asteraceae | 8 |
| Parthenocissus quinquefolia | (L.) Planch. | Vitaceae | 8 |
| Paspalum distichum | L. | Poaceae | 8 |
| Paspalum floridanum | Michx. | Poaceae | 8 |
| Paspalum laeve | Michx. | Poaceae | 8 |
| Paspalum pubiflorum | Rupr. ex E.Fourn. | Poaceae | 8 |
| Paspalum repens | P.J.Bergius | Poaceae | 8 |
| Paspalum setaceum | Michx. | Poaceae | 8 |
| Passiflora incarnata | L. | Passifloraceae | 8 |
| Passiflora lutea | L. | Passifloraceae | 8 |
| Pectis angustifolia | Torr. | Asteraceae | 8 |
| Pedicularis canadensis | L. | Orobanchaceae | 8 |
| Pediomelum argophyllum | (Pursh) J.W.Grimes | Fabaceae | 8 |
| Pediomelum cuspidatum | (Pursh) Rydb. | Fabaceae | 8 |
| Pediomelum digitatum | (Nutt.) Isely | Fabaceae | 8 |
| Pediomelum esculentum | (Pursh) Rydb. | Fabaceae | 8 |
| Pediomelum hypogaeum | (Nutt.) Rydb. | Fabaceae | 8 |
| Pediomelum linearifolium | (Torr. & A.Gray) J.W.Grimes | Fabaceae | 8 |
| Pediomelum tenuiflorum | (Pursh) A.N.Egan | Fabaceae | 8 |
| Pelecyphora missouriensis | (Sweet) D.Aquino & Dan.Sánchez | Cactaceae | 8 |
| Pelecyphora vivipara | (Nutt.) D.Aquino & Dan.Sánchez | Cactaceae | 8 |
| Pellaea atropurpurea | (L.) Link | Pteridaceae | 8 |
| Pellaea glabella | Mett. | Pteridaceae | 8 |
| Peltandra virginica | (L.) Schott | Araceae | 8 |
| Penstemon albidus | Nutt. | Plantaginaceae | 8 |
| Penstemon ambiguus | Torr. | Plantaginaceae | 8 |
| Penstemon angustifolius | Nutt. ex Pursh | Plantaginaceae | 8 |
| Penstemon bradburyi | Pursh | Plantaginaceae | 8 |
| Penstemon buckleyi | Pennell | Plantaginaceae | 8 |
| Penstemon cobaea | Nutt. | Plantaginaceae | 8 |
| Penstemon digitalis | Nutt. ex Sims | Plantaginaceae | 8 |
| Penstemon fendleri | Torr. & A.Gray | Plantaginaceae | 8 |
| Penstemon jamesii | Benth. | Plantaginaceae | 8 |
| Penstemon pallidus | Small | Plantaginaceae | 8 |
| Penstemon tubaeflorus | Nutt. | Plantaginaceae | 8 |
| Penthorum sedoides | L. | Penthoraceae | 8 |
| Perideridia americana | (Nutt. ex DC.) Rchb. ex Steud. | Apiaceae | 8 |
| Persicaria amphibia | (L.) Delarbre | Polygonaceae | 8 |
| Persicaria bicornis | (Raf.) Nieuwl. | 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 |
| Phacelia gilioides | Brand | Hydrophyllaceae | 8 |
| Phacelia hirsuta | Nutt. | Hydrophyllaceae | 8 |
| Phacelia integrifolia | Torr. | Hydrophyllaceae | 8 |
| Phalaris arundinacea | L. | Poaceae | 8 |
| Phalaris caroliniana | Walter | Poaceae | 8 |
| Phemeranthus calycinus | (Engelm.) Kiger | Montiaceae | 8 |
| Phemeranthus parviflorus | (Nutt.) Kiger | Montiaceae | 8 |
| Phemeranthus rugospermus | (Holz.) Kiger | Montiaceae | 8 |
| Phlox andicola | (Britton) E.E.Nelson | Polemoniaceae | 8 |
| Phlox bifida | L.C.Beck | Polemoniaceae | 8 |
| Phlox divaricata | L. | Polemoniaceae | 8 |
| Phlox paniculata | L. | Polemoniaceae | 8 |
| Phlox pilosa | L. | Polemoniaceae | 8 |
| Phoradendron leucarpum | (Raf.) Reveal & M.C.Johnst. | Santalaceae | 8 |
| Phragmites australis | (Cav.) Steud. | Poaceae | 8 |
| Phryma leptostachya | L. | Phrymaceae | 8 |
| Phyla cuneifolia | (Torr.) Greene | Verbenaceae | 8 |
| Phyla lanceolata | (Michx.) Greene | Verbenaceae | 8 |
| Phyla nodiflora | (L.) Greene | Verbenaceae | 8 |
| Phyllanthus caroliniensis | Walter | Phyllanthaceae | 8 |
| Phyllanthus warnockii | G.L.Webster | Phyllanthaceae | 8 |
| Physalis hederifolia | A.Gray | Solanaceae | 8 |
| Physalis longifolia | Nutt. | Solanaceae | 8 |
| Physalis pubescens | L. | Solanaceae | 8 |
| Physalis pumila | Nutt. | Solanaceae | 8 |
| Physalis virginiana | Mill. | Solanaceae | 8 |
| Physaria fendleri | (A.Gray) O'Kane & Al-Shehbaz | Brassicaceae | 8 |
| Physaria gordonii | (A.Gray) O'Kane & Al-Shehbaz | Brassicaceae | 8 |
| Physaria ludoviciana | (Nutt.) O'Kane & Al-Shehbaz | Brassicaceae | 8 |
| Physaria ovalifolia | (Rydb.) O'Kane & Al-Shehbaz | Brassicaceae | 8 |
| Physocarpus intermedius | (Rydb.) C.K.Schneid. | Rosaceae | 8 |
| Physocarpus opulifolius | (L.) Maxim. | Rosaceae | 8 |
| Physostegia angustifolia | Fernald | Lamiaceae | 8 |
| Physostegia virginiana | (L.) Benth. | Lamiaceae | 8 |
| Phytolacca americana | L. | Phytolaccaceae | 8 |
| Picradeniopsis oppositifolia | (Nutt.) Rydb. | Asteraceae | 8 |
| Pilea pumila | A.Gray | Urticaceae | 8 |
| Pilularia americana | A.Br. | Marsileaceae | 8 |
| Planodes virginicum | (L.) Greene | Brassicaceae | 8 |
| Plantago aristata | Michx. | Plantaginaceae | 8 |
| Plantago elongata | Pursh | Plantaginaceae | 8 |
| Plantago heterophylla | Nutt. | Plantaginaceae | 8 |
| Plantago patagonica | Jacq. | Plantaginaceae | 8 |
| Plantago rhodosperma | Decne. | Plantaginaceae | 8 |
| Plantago rugelii | Decne. | Plantaginaceae | 8 |
| Plantago virginica | L. | Plantaginaceae | 8 |
| Plantago wrightiana | Decne. | Plantaginaceae | 8 |
| Platanthera lacera | (Michx.) G.Don | Orchidaceae | 8 |
| Platanus occidentalis | L. | Platanaceae | 8 |
| Plectocephalus americanus | (Nutt.) D.Don | Asteraceae | 8 |
| Pleopeltis michauxiana | (Weath.) Hickey & Sprunt | Polypodiaceae | 8 |
| Pluchea odorata | (L.) Cass. | Asteraceae | 8 |
| Poa arachnifera | Torr. | Poaceae | 8 |
| Poa pratensis | L. | Poaceae | 8 |
| Poa sylvestris | A.Gray | Poaceae | 8 |
| Podophyllum peltatum | L. | Berberidaceae | 8 |
| Polemonium reptans | L. | Polemoniaceae | 8 |
| Polygala senega | L. | Polygalaceae | 8 |
| Polygonatum biflorum | (Walter) Elliott | Asparagaceae | 8 |
| Polygonum achoreum | S.F.Blake | Polygonaceae | 8 |
| Polygonum aviculare | L. | Polygonaceae | 8 |
| Polygonum tenue | Michx. | Polygonaceae | 8 |
| Polymnia canadensis | L. | Asteraceae | 8 |
| Polystichum acrostichoides | (Michx.) Schott | Dryopteridaceae | 8 |
| Polytaenia nuttallii | DC. | Apiaceae | 8 |
| Pomaria jamesii | (Torr. & A.Gray) Walp. | Fabaceae | 8 |
| Pombalia verticillata | (Ortega) Paula-Souza | Violaceae | 8 |
| Pontederia cordata | L. | Pontederiaceae | 8 |
| Populus deltoides | W.Bartram ex Marshall | Salicaceae | 8 |
| Portulaca pilosa | L. | Portulacaceae | 8 |
| Potamogeton amplifolius | Tuck. | Potamogetonaceae | 8 |
| Potamogeton diversifolius | Raf. | Potamogetonaceae | 8 |
| Potamogeton foliosus | Raf. | Potamogetonaceae | 8 |
| Potamogeton gramineus | L. | Potamogetonaceae | 8 |
| Potamogeton illinoensis | Morong | Potamogetonaceae | 8 |
| Potamogeton natans | L. | Potamogetonaceae | 8 |
| Potamogeton nodosus | Poir. | Potamogetonaceae | 8 |
| Potamogeton pusillus | L. | Potamogetonaceae | 8 |
| Potamogeton zosteriformis | Fernald | Potamogetonaceae | 8 |
| Potentilla norvegica | L. | Rosaceae | 8 |
| Potentilla rivalis | Nutt. | Rosaceae | 8 |
| Potentilla simplex | Michx. | Rosaceae | 8 |
| Potentilla supina | L. | Rosaceae | 8 |
| Primula meadia | (L.) A.R.Mast & Reveal | Primulaceae | 8 |
| Proboscidea louisianica | (Mill.) Thell. | Martyniaceae | 8 |
| Prunella vulgaris | L. | Lamiaceae | 8 |
| Prunus americana | Marshall | Rosaceae | 8 |
| Prunus angustifolia | Marshall | Rosaceae | 8 |
| Prunus gracilis | Engelm. & A.Gray | Rosaceae | 8 |
| Prunus mexicana | S.Watson | Rosaceae | 8 |
| Prunus pumila | L. | Rosaceae | 8 |
| Prunus rivularis | Scheele | Rosaceae | 8 |
| Prunus serotina | Ehrh. | Rosaceae | 8 |
| Prunus virginiana | L. | Rosaceae | 8 |
| Psilostrophe villosa | Rydb. ex Britton | Asteraceae | 8 |
| Ptelea trifoliata | L. | Rutaceae | 8 |
| Pteridium aquilinum | (L.) Kuhn | Dennstaedtiaceae | 8 |
| Ptilimnium nuttallii | (DC.) Britton | Apiaceae | 8 |
| Puccinellia nuttalliana | (Schult.) Hitchc. | Poaceae | 8 |
| Pycnanthemum albescens | Torr. & A.Gray | 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 |
| Pyrrhopappus carolinianus | (Walter) DC. | Asteraceae | 8 |
| Quercus alba | L. | Fagaceae | 8 |
| Quercus bicolor | Willd. | Fagaceae | 8 |
| Quercus imbricaria | Michx. | Fagaceae | 8 |
| Quercus macrocarpa | Michx. | Fagaceae | 8 |
| Quercus marilandica | (L.) Münchh. | Fagaceae | 8 |
| Quercus muehlenbergii | Engelm. | Fagaceae | 8 |
| Quercus palustris | Münchh. | Fagaceae | 8 |
| Quercus rubra | L. | Fagaceae | 8 |
| Quercus shumardii | Buckley | Fagaceae | 8 |
| Quercus stellata | Wangenh. | Fagaceae | 8 |
| Quercus velutina | Lam. | Fagaceae | 8 |
| Quincula lobata | (Torr.) Raf. | Solanaceae | 8 |
| Ranunculus abortivus | L. | Ranunculaceae | 8 |
| Ranunculus carolinianus | DC. | Ranunculaceae | 8 |
| Ranunculus fascicularis | Muhl. ex Bigelow | Ranunculaceae | 8 |
| Ranunculus flabellaris | Raf. | Ranunculaceae | 8 |
| Ranunculus hispidus | Michx. | Ranunculaceae | 8 |
| Ranunculus micranthus | Nutt. | Ranunculaceae | 8 |
| Ranunculus minimus | E.H.L.Krause | Ranunculaceae | 8 |
| Ranunculus recurvatus | Poir. | 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 |
| Ratibida tagetes | (E.James) Barnhart | Asteraceae | 8 |
| Rhamnus lanceolata | Pursh | Rhamnaceae | 8 |
| Rhus aromatica | Aiton | Anacardiaceae | 8 |
| Rhus copallinum | L. | Anacardiaceae | 8 |
| Rhus glabra | L. | Anacardiaceae | 8 |
| Rhynchospora capitellata | (Michx.) Vahl | Cyperaceae | 8 |
| Rhynchospora harveyi | W.Boott | Cyperaceae | 8 |
| Rhynchospora macrostachya | Torr. ex A.Gray | Cyperaceae | 8 |
| Rhynchospora recognita | (Gale) Kral | Cyperaceae | 8 |
| Ribes aureum | Pursh | Grossulariaceae | 8 |
| Ribes missouriense | Nutt. | Grossulariaceae | 8 |
| Rorippa curvipes | Greene | Brassicaceae | 8 |
| Rorippa palustris | (L.) Besser | Brassicaceae | 8 |
| Rorippa sessiliflora | (Nutt.) Hitchc. | Brassicaceae | 8 |
| Rosa arkansana | Porter | Rosaceae | 8 |
| Rosa carolina | L. | Rosaceae | 8 |
| Rosa foliolosa | Nutt. | Rosaceae | 8 |
| Rosa setigera | Michx. | Rosaceae | 8 |
| Rosa woodsii | Lindl. | Rosaceae | 8 |
| Rotala ramosior | (L.) Koehne | Lythraceae | 8 |
| Rottboellia campestris | Nutt. | Poaceae | 8 |
| Rubus allegheniensis | Porter | Rosaceae | 8 |
| Rubus flagellaris | Willd. | Rosaceae | 8 |
| Rubus occidentalis | L. | Rosaceae | 8 |
| Rubus trivialis | Michx. | Rosaceae | 8 |
| Rudbeckia amplexicaulis | Vahl | 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 |
| Ruellia strepens | L. | Acanthaceae | 8 |
| Rumex altissimus | Alph.Wood | Polygonaceae | 8 |
| Rumex hastatulus | Baldwin | 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 |
| Sabatia campestris | Nutt. | Gentianaceae | 8 |
| Sabulina michauxii | (Fenzl) Dillenb. & Kadereit | Caryophyllaceae | 8 |
| Sabulina patula | (Michx.) Small ex Rydb. | Caryophyllaceae | 8 |
| Sagina decumbens | (Elliott) Torr. & A.Gray | Caryophyllaceae | 8 |
| Sagittaria brevirostra | Mack. & Bush | Alismataceae | 8 |
| Sagittaria cuneata | E.Sheld. | Alismataceae | 8 |
| Sagittaria graminea | Michx. | Alismataceae | 8 |
| Sagittaria latifolia | Willd. | Alismataceae | 8 |
| Sagittaria longiloba | Engelm. ex J.G.Sm. | Alismataceae | 8 |
| Sagittaria montevidensis | Cham. & Schltdl. | Alismataceae | 8 |
| Sagittaria rigida | Pursh | Alismataceae | 8 |
| Salicornia rubra | A.Nelson | Chenopodiaceae | 8 |
| Salix amygdaloides | Andersson | Salicaceae | 8 |
| Salix caroliniana | Michx. | Salicaceae | 8 |
| Salix eriocephala | Michx. | Salicaceae | 8 |
| Salix humilis | Marshall | Salicaceae | 8 |
| Salix interior | Rowlee | Salicaceae | 8 |
| Salix nigra | Marshall | Salicaceae | 8 |
| Salvia azurea | Lam. ex Vahl | Lamiaceae | 8 |
| Salvia lyrata | L. | Lamiaceae | 8 |
| Salvia reflexa | Hornem. | Lamiaceae | 8 |
| Sambucus canadensis | L. | Viburnaceae | 8 |
| Samolus ebracteatus | Kunth | Primulaceae | 8 |
| Samolus parviflorus | Raf. | Primulaceae | 8 |
| Sanguinaria canadensis | L. | Papaveraceae | 8 |
| Sanguisorba annua | (Nutt. ex Hook.) Torr. & A.Gray | Rosaceae | 8 |
| Sanicula canadensis | L. | Apiaceae | 8 |
| Sanicula marilandica | L. | Apiaceae | 8 |
| Sanicula odorata | (Raf.) K.M.Pryer & L.R.Phillippe | Apiaceae | 8 |
| Sapindus drummondii | Hook. & Arn. | Sapindaceae | 8 |
| Sassafras albidum | (Nutt.) Nees | Lauraceae | 8 |
| Saururus cernuus | L. | Saururaceae | 8 |
| Sceptridium dissectum | (Spreng.) Lyon | Ophioglossaceae | 8 |
| Schizachyrium scoparium | (Michx.) Nash | Poaceae | 8 |
| Schoenoplectus acutus | (Muhl. ex Bigelow) Á.Löve & D.Löve | Cyperaceae | 8 |
| Schoenoplectus americanus | (Pers.) Volkart | Cyperaceae | 8 |
| Schoenoplectus californicus | (C.A.Mey.) Soják | Cyperaceae | 8 |
| Schoenoplectus heterochaetus | (Chase) Soják | Cyperaceae | 8 |
| Schoenoplectus pungens | (Vahl) Palla | Cyperaceae | 8 |
| Schoenoplectus tabernaemontani | (C.C.Gmel.) Palla | Cyperaceae | 8 |
| Scirpus atrovirens | Willd. | Cyperaceae | 8 |
| Scirpus georgianus | R.M.Harper | Cyperaceae | 8 |
| Scirpus pendulus | Muhl. | Cyperaceae | 8 |
| Scleria pauciflora | Muhl. ex Willd. | Cyperaceae | 8 |
| Scleria triglomerata | Michx. | Cyperaceae | 8 |
| Scrophularia lanceolata | Pursh | Scrophulariaceae | 8 |
| Scrophularia marilandica | L. | Scrophulariaceae | 8 |
| Scutellaria brittonii | Porter | Lamiaceae | 8 |
| Scutellaria drummondii | Benth. | Lamiaceae | 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 |
| Sedum nuttallii | Torr. & E.James ex Eaton | Crassulaceae | 8 |
| Sedum pulchellum | Michx. | Crassulaceae | 8 |
| Selaginella rupestris | (L.) Spring | Selaginellaceae | 8 |
| Selenia aurea | Nutt. | Brassicaceae | 8 |
| Senecio flaccidus | Less. | Asteraceae | 8 |
| Senecio integerrimus | Nutt. | Asteraceae | 8 |
| Senna marilandica | (L.) Link | Fabaceae | 8 |
| Sesuvium maritimum | (Walter) Britton, Sterns & Poggenb. | Aizoaceae | 8 |
| Setaria parviflora | (Poir.) Kerguélen | Poaceae | 8 |
| Shepherdia argentea | (Pursh) Nutt. | Elaeagnaceae | 8 |
| Sicyos angulatus | L. | Cucurbitaceae | 8 |
| Sideroxylon lanuginosum | Michx. | Sapotaceae | 8 |
| Silene antirrhina | L. | Caryophyllaceae | 8 |
| Silene caroliniana | Walter | Caryophyllaceae | 8 |
| Silene regia | Sims | 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 radula | Nutt. | Asteraceae | 8 |
| Sisyrinchium angustifolium | Mill. | Iridaceae | 8 |
| Sisyrinchium campestre | E.P.Bicknell | Iridaceae | 8 |
| Sisyrinchium ensigerum | E.P.Bicknell | Iridaceae | 8 |
| Sisyrinchium montanum | Greene | Iridaceae | 8 |
| Sisyrinchium pruinosum | E.P.Bicknell | Iridaceae | 8 |
| Sium suave | Walter | Apiaceae | 8 |
| Smallanthus uvedalia | (L.) Mack. | Asteraceae | 8 |
| Smilax bona-nox | L. | Smilacaceae | 8 |
| Smilax ecirrhata | (Engelm. ex Kunth) S.Watson | Smilacaceae | 8 |
| Smilax rotundifolia | L. | Smilacaceae | 8 |
| Smilax tamnoides | L. | Smilacaceae | 8 |
| Solanum carolinense | L. | Solanaceae | 8 |
| Solanum dimidiatum | Raf. | Solanaceae | 8 |
| Solanum elaeagnifolium | Cav. | Solanaceae | 8 |
| Solanum emulans | Raf. | Solanaceae | 8 |
| Solanum rostratum | Dunal | Solanaceae | 8 |
| Solanum triflorum | Nutt. | Solanaceae | 8 |
| Solidago altissima | L. | Asteraceae | 8 |
| Solidago arguta | Aiton | Asteraceae | 8 |
| Solidago canadensis | L. | Asteraceae | 8 |
| Solidago flexicaulis | L. | Asteraceae | 8 |
| Solidago gigantea | Aiton | Asteraceae | 8 |
| Solidago missouriensis | Nutt. | Asteraceae | 8 |
| Solidago nemoralis | Aiton | Asteraceae | 8 |
| Solidago petiolaris | Aiton | Asteraceae | 8 |
| Solidago radula | Nutt. | Asteraceae | 8 |
| Solidago rigida | L. | Asteraceae | 8 |
| Solidago rigidiuscula | (Torr. & A.Gray) Porter | Asteraceae | 8 |
| Solidago ulmifolia | Muhl. ex Willd. | Asteraceae | 8 |
| Sophora nuttalliana | B.L.Turner | Fabaceae | 8 |
| Sorghastrum nutans | (L.) Nash | Poaceae | 8 |
| Sorghastrum secundum | (Elliott) Nash | Poaceae | 8 |
| Sparganium americanum | Nutt. | Typhaceae | 8 |
| Sparganium eurycarpum | Engelm. | Typhaceae | 8 |
| Spermacoce glabra | Michx. | Rubiaceae | 8 |
| Spermolepis inermis | (Nutt. ex DC.) Mathias & Constance | Apiaceae | 8 |
| Sphaeralcea coccinea | (Nutt.) Rydb. | Malvaceae | 8 |
| Sphaeralcea fendleri | A.Gray | Malvaceae | 8 |
| Sphenopholis intermedia | (Rydb.) Rydb. | Poaceae | 8 |
| Sphenopholis obtusata | (Michx.) Scribn. | Poaceae | 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 tuberosa | Raf. | Orchidaceae | 8 |
| Spiranthes vernalis | Engelm. & A.Gray | Orchidaceae | 8 |
| Spirodela polyrhiza | (L.) Schleid. | Araceae | 8 |
| Sporobolus airoides | (Torr.) Torr. | Poaceae | 8 |
| Sporobolus arenicola | P.M.Peterson | Poaceae | 8 |
| Sporobolus clandestinus | (Biehler) Hitchc. | Poaceae | 8 |
| Sporobolus compositus | (Poir.) Merr. | Poaceae | 8 |
| Sporobolus cryptandrus | (Torr.) A.Gray | Poaceae | 8 |
| Sporobolus flexuosus | (Vasey) Rydb. | Poaceae | 8 |
| Sporobolus giganteus | Nash | Poaceae | 8 |
| Sporobolus heterolepis | (A.Gray) A.Gray | Poaceae | 8 |
| Sporobolus hookerianus | P.M.Peterson & Saarela | Poaceae | 8 |
| Sporobolus michauxianus | (Hitchc.) P.M.Peterson & Saarela | Poaceae | 8 |
| Sporobolus neglectus | Nash | Poaceae | 8 |
| Sporobolus pyramidatus | (Lam.) Hitchc. | Poaceae | 8 |
| Sporobolus rigidus | (Buckley) P.M.Peterson | Poaceae | 8 |
| Sporobolus vaginiflorus | (Torr. ex A.Gray) Alph.Wood | Poaceae | 8 |
| Stachys latidens | Small | Lamiaceae | 8 |
| Stachys pilosa | Nutt. | Lamiaceae | 8 |
| Stachys tenuifolia | Willd. | Lamiaceae | 8 |
| Stanleya pinnata | (Pursh) Britton | Brassicaceae | 8 |
| Stenaria nigricans | (Lam.) Terrell | Rubiaceae | 8 |
| Stenotus armerioides | Nutt. | Asteraceae | 8 |
| Stephanomeria pauciflora | (Torr.) A.Nelson | Asteraceae | 8 |
| Stillingia sylvatica | L. | Euphorbiaceae | 8 |
| Streptanthus hyacinthoides | Hook. | Brassicaceae | 8 |
| Strophostyles leiosperma | (Torr. & A.Gray) Piper | Fabaceae | 8 |
| Strophostyles umbellata | (Muhl. ex Willd.) Britton | Fabaceae | 8 |
| Stuckenia pectinata | (L.) Börner | Potamogetonaceae | 8 |
| Stylisma pickeringii | (Torr. ex M.A.Curtis) A.Gray | Convolvulaceae | 8 |
| Suaeda calceoliformis | (Hook.) Moq. | Chenopodiaceae | 8 |
| Symphoricarpos occidentalis | (R.Br.) Hook. | Caprifoliaceae | 8 |
| Symphoricarpos orbiculatus | Moench | Caprifoliaceae | 8 |
| Symphyotrichum anomalum | (Engelm.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum ciliatum | (Ledeb.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum drummondii | (Lindl.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum ericoides | (L.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum falcatum | (Lindl.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum fendleri | (A.Gray) 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 patens | (Aiton) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum pilosum | (Willd.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum praealtum | (Poir.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum sericeum | (Vent.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum turbinellum | (Lindl.) G.L.Nesom | Asteraceae | 8 |
| Symphyotrichum urophyllum | (Lindl.) G.L.Nesom | Asteraceae | 8 |
| Taenidia integerrima | (L.) Drude | Apiaceae | 8 |
| Tephrosia virginiana | (L.) Pers. | Fabaceae | 8 |
| Tetraneuris acaulis | Greene | Asteraceae | 8 |
| Tetraneuris linearifolia | Greene | Asteraceae | 8 |
| Tetraneuris scaposa | (DC.) Greene | Asteraceae | 8 |
| Teucrium canadense | L. | Lamiaceae | 8 |
| Teucrium laciniatum | Torr. | Lamiaceae | 8 |
| Thalictrum dasycarpum | Fisch., C.A.Mey. & Avé-Lall. | Ranunculaceae | 8 |
| Thalictrum dioicum | L. | Ranunculaceae | 8 |
| Thaspium chapmanii | (J.M.Coult. & Rose) Small | Apiaceae | 8 |
| Thelesperma filifolium | (Hook.) A.Gray | Asteraceae | 8 |
| Thelesperma megapotamicum | (Spreng.) Kuntze | Asteraceae | 8 |
| Thelypteris palustris | Schott | Thelypteridaceae | 8 |
| Tidestromia lanuginosa | (Nutt.) Standl. | Amaranthaceae | 8 |
| Tilia americana | L. | Malvaceae | 8 |
| Tomostima cuneifolia | (Nutt. ex Torr. & A.Gray) Al-Shehbaz, M.Koch & Jordon-Thaden | Brassicaceae | 8 |
| Tomostima reptans | (Lam.) Al-Shehbaz, M.Koch & Jordon-Thaden | Brassicaceae | 8 |
| Townsendia exscapa | (Richardson) Porter | Asteraceae | 8 |
| Toxicodendron pubescens | Mill. | Anacardiaceae | 8 |
| Toxicodendron radicans | (L.) Kuntze | Anacardiaceae | 8 |
| Toxicoscordion nuttallii | (A.Gray) Rydb. | Melanthiaceae | 8 |
| Tradescantia bracteata | Small | Commelinaceae | 8 |
| Tradescantia occidentalis | (Britton) Smyth | Commelinaceae | 8 |
| Tradescantia ohiensis | Raf. | Commelinaceae | 8 |
| Tradescantia tharpii | E.S.Anderson & Woodson | Commelinaceae | 8 |
| Tragia betonicifolia | Nutt. | Euphorbiaceae | 8 |
| Tragia ramosa | Torr. | Euphorbiaceae | 8 |
| Trichogalium circaezans | (Michx.) Kadereit & Schneew. | Rubiaceae | 8 |
| Tridens albescens | (Vasey) Wooton & Standl. | Poaceae | 8 |
| Tridens flavus | (L.) Hitchc. | Poaceae | 8 |
| Tridens strictus | (Nutt.) Nash | Poaceae | 8 |
| Tridentopsis mutica | (Torr.) P.M.Peterson | Poaceae | 8 |
| Trifolium reflexum | L. | Fabaceae | 8 |
| Triglochin maritima | L. | Juncaginaceae | 8 |
| Trillium sessile | L. | Melanthiaceae | 8 |
| Trillium viridescens | Nutt. | Melanthiaceae | 8 |
| Triodanis holzingeri | McVaugh | Campanulaceae | 8 |
| Triodanis lamprosperma | McVaugh | Campanulaceae | 8 |
| Triodanis leptocarpa | Nieuwl. | Campanulaceae | 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 |
| Typha angustifolia | L. | Typhaceae | 8 |
| Typha domingensis | Pers. | Typhaceae | 8 |
| Typha latifolia | L. | Typhaceae | 8 |
| Ulmus alata | Michx. | Ulmaceae | 8 |
| Ulmus americana | L. | Ulmaceae | 8 |
| Ulmus rubra | Muhl. | Ulmaceae | 8 |
| Ulmus thomasii | Sarg. | Ulmaceae | 8 |
| Urtica chamaedryoides | Pursh | Urticaceae | 8 |
| Urtica gracilis | Aiton | Urticaceae | 8 |
| Utricularia gibba | L. | Lentibulariaceae | 8 |
| Utricularia macrorhiza | Leconte | Lentibulariaceae | 8 |
| Uvularia grandiflora | Sm. | Colchicaceae | 8 |
| Vaccinium arboreum | Marshall | Ericaceae | 8 |
| Vaccinium pallidum | Aiton | Ericaceae | 8 |
| Vaccinium stamineum | L. | Ericaceae | 8 |
| Valeriana amarella | (Lindh. ex Engelm.) Christenh. & Byng | Caprifoliaceae | 8 |
| Verbena bipinnatifida | (Nutt.) Schauer | Verbenaceae | 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 |
| Verbesina helianthoides | Michx. | Asteraceae | 8 |
| Verbesina virginica | L. | Asteraceae | 8 |
| Vernonia arkansana | DC. | Asteraceae | 8 |
| Vernonia baldwinii | Torr. | Asteraceae | 8 |
| Vernonia fasciculata | Michx. | Asteraceae | 8 |
| Vernonia gigantea | (Walter) Trel. | Asteraceae | 8 |
| Vernonia missurica | Raf. | Asteraceae | 8 |
| Veronica americana | (Raf.) Schwein. ex Benth. | Plantaginaceae | 8 |
| Veronica catenata | Pennell | Plantaginaceae | 8 |
| Veronica peregrina | L. | Plantaginaceae | 8 |
| Veronica serpyllifolia | L. | Plantaginaceae | 8 |
| Veronicastrum virginicum | (L.) Farw. | Plantaginaceae | 8 |
| Vesper montanus | (Torr. & A.Gray) R.L.Hartm. & G.L.Nesom | Apiaceae | 8 |
| Viburnum prunifolium | L. | Viburnaceae | 8 |
| Viburnum rufidulum | Raf. | Viburnaceae | 8 |
| Vicia americana | Muhl. ex Willd. | Fabaceae | 8 |
| Viola lanceolata | L. | Violaceae | 8 |
| Viola missouriensis | Greene | Violaceae | 8 |
| Viola nephrophylla | Greene | Violaceae | 8 |
| Viola nuttallii | Pursh | Violaceae | 8 |
| Viola palmata | L. | Violaceae | 8 |
| Viola pedata | L. | Violaceae | 8 |
| Viola pedatifida | G.Don | Violaceae | 8 |
| Viola pubescens | Aiton | Violaceae | 8 |
| Viola rafinesquei | Greene | Violaceae | 8 |
| Viola sagittata | Aiton | Violaceae | 8 |
| Viola sororia | Willd. | Violaceae | 8 |
| Viola striata | Aiton | Violaceae | 8 |
| Viola vallicola | A.Nelson | Violaceae | 8 |
| Vitis acerifolia | Raf. | Vitaceae | 8 |
| Vitis aestivalis | Michx. | Vitaceae | 8 |
| Vitis cinerea | (Engelm.) Millardet | Vitaceae | 8 |
| Vitis riparia | Michx. | Vitaceae | 8 |
| Vitis vulpina | L. | Vitaceae | 8 |
| Wolffia borealis | (Engelm.) Landolt | Araceae | 8 |
| Wolffia brasiliensis | Wedd. | Araceae | 8 |
| Wolffia columbiana | H.Karst. | Araceae | 8 |
| Woodsia obtusa | (Sw.) Torr. | Woodsiaceae | 8 |
| Woodsia oregana | D.C.Eaton | Woodsiaceae | 8 |
| Xanthisma spinulosum | (Pursh) D.R.Morgan & R.L.Hartm. | Asteraceae | 8 |
| Xanthium orientale | L. | Asteraceae | 8 |
| Xanthium spinosum | L. | Asteraceae | 8 |
| Xanthium strumarium | L. | Asteraceae | 8 |
| Yucca arkansana | Trel. | Asparagaceae | 8 |
| Yucca flaccida | Haw. | Asparagaceae | 8 |
| Yucca glauca | Nutt. | Asparagaceae | 8 |
| Zannichellia palustris | L. | Potamogetonaceae | 8 |
| Zanthoxylum americanum | Mill. | Rutaceae | 8 |
| Zeltnera texensis | (Griseb.) G.Mans. ex J.S.Pringle | Gentianaceae | 8 |
| Zephyranthes chlorosolen | (Herb.) D.Dietr. | Amaryllidaceae | 8 |
| Zinnia grandiflora | Nutt. | Asteraceae | 8 |
| Zizania aquatica | L. | Poaceae | 8 |
| Zizania palustris | L. | Poaceae | 8 |
| Allium perdulce | S.V.Fraser | Amaryllidaceae | 7 |
| Brickellia brachyphylla | (A.Gray) A.Gray | Asteraceae | 7 |
| Bromus marginatus | Nees ex Steud. | Poaceae | 7 |
| Corispermum americanum | (Nutt.) Nutt. | Chenopodiaceae | 7 |
| Crataegus reverchonii | Sarg. | Rosaceae | 7 |
| Cyperus hortensis | (Salzm. ex Steud.) Dorr | Cyperaceae | 7 |
| Didiplis diandra | (Nutt. ex DC.) Alph.Wood | Lythraceae | 7 |
| Festuca saximontana | Rydb. | Poaceae | 7 |
| Isoetes melanopoda | J.Gay & Durieu | Isoetaceae | 7 |
| Pyrrhopappus grandiflorus | (Nutt.) Nutt. | Asteraceae | 7 |
| Scirpus pallidus | (Britton) Fernald | Cyperaceae | 7 |
| Senecio riddellii | Torr. & A.Gray | Asteraceae | 7 |
| Amaranthus arenicola | I.M.Johnst. | Amaranthaceae | 6 |
| Aristida basiramea | Vasey | Poaceae | 6 |
| Bacopa rotundifolia | (Michx.) Wettst. | Plantaginaceae | 6 |
| Calystegia macounii | (Greene) Brummitt | Convolvulaceae | 6 |
| Eragrostis capillaris | (L.) Nees | Poaceae | 6 |
| Flaveria campestris | J.R.Johnst. | Asteraceae | 6 |
| Muhlenbergia sobolifera | (Muhl. ex Willd.) Trin. | Poaceae | 6 |
| Physalis missouriensis | Mack. & Bush | Solanaceae | 6 |
| Plantago pusilla | Nutt. | Plantaginaceae | 6 |
| Platanthera praeclara | Sheviak & M.L.Bowles | Orchidaceae | 6 |
| Polygonum ramosissimum | Michx. | Polygonaceae | 6 |
| Scolochloa festucacea | (Willd.) Link | Poaceae | 6 |
| Aristida havardii | Vasey | Poaceae | 5 |
| Asclepias lanuginosa | Nutt. | Apocynaceae | 5 |
| Cleomella angustifolia | Torr. | Cleomaceae | 5 |
| Muhlenbergia andina | (Nutt.) Hitchc. | Poaceae | 5 |
| Panicum philadelphicum | Bernh. ex Nees | Poaceae | 5 |
| Scutellaria resinosa | Torr. | Lamiaceae | 5 |
| Bouteloua simplex | Lag. | Poaceae | 4 |
| Carex laeviconica | Dewey | Cyperaceae | 4 |
| Carex oligocarpa | Willd. | Cyperaceae | 4 |
| Cyperus hemidrummondii | Goetgh. | Cyperaceae | 4 |
| Cyperus setigerus | Torr. & Hook. | Cyperaceae | 4 |
| Erigeron canus | A.Gray | Asteraceae | 4 |
| Helanthium tenellum | (Mart. ex Schult.f.) Britton | Alismataceae | 4 |
| Heteranthera rotundifolia | (Kunth) Griseb. | Pontederiaceae | 4 |
| Ipomoea shumardiana | (Torr.) Shinners | Convolvulaceae | 4 |
| Ludwigia polycarpa | Short & R.Peter | Onagraceae | 4 |
| Pycnanthemum torreyi | Benth. | Lamiaceae | 4 |
| Schoenoplectiella hallii | (A.Gray) Lye | Cyperaceae | 4 |
| Solidago mollis | Bartl. | Asteraceae | 4 |
| Vernonia marginata | (Torr.) Raf. | Asteraceae | 4 |
| Carex mesochorea | Mack. | Cyperaceae | 3 |
| Carex missouriensis | P.Rothr. & Reznicek | Cyperaceae | 3 |
| Carex oklahomensis | Mack. | Cyperaceae | 3 |
| Chenopodium cycloides | A.Nelson | Chenopodiaceae | 3 |
| Chenopodium desiccatum | A.Nelson | Chenopodiaceae | 3 |
| Echinocereus reichenbachii | (Terscheck ex Walp.) J.N.Haage | Cactaceae | 3 |
| Eriocoma robusta | (Vasey) Romasch. | Poaceae | 3 |
| Erysimum inconspicuum | (S.Watson) MacMill. | Brassicaceae | 3 |
| Heteranthera missouriensis | C.N.Horn | Pontederiaceae | 3 |
| Thymophylla aurea | (A.Gray) Greene ex Britton & A.Br. | Asteraceae | 3 |
Abdra brachycarpa
Abronia fragranssnowball sand verbena
Abronia micranthasmallflower sandverbena
Acaciella angustissimaprairie acacia
Acalypha deamiiDeam's threeseed mercury
Acalypha monococcaslender threeseed mercury
Acalypha persimilispineland threeseed mercury
Acalypha rhomboideaCommon three-seeded copperleaf
Acalypha virginicaVirginia threeseed mercury
Acer negundobox elder
Acer saccharinumsilver maple
Acer saccharumsugar maple
Acorus calamusSweet Flag
Actaea pachypodawhite baneberry
Adiantum pedatumnorthern maidenhair fern
Aesculus glabraOhio buckeye
Agalinis asperatall false foxglove
Agalinis auriculataearleaf false foxglove
Agalinis densifloraOsage false foxglove
Agalinis fasciculatabeach false foxglove
Agalinis gattingeriroundstem false foxglove
Agalinis heterophyllaPrairie False Foxglove
Agalinis purpureapurple false foxglove
Agalinis tenuifoliaslenderleaf false foxglove
Agastache nepetoidesYellow Giant Hyssop
Agastache scrophulariifoliapurple giant hyssop
Ageratina altissimawhite snakeroot
Agrimonia gryposepalaCommon Agrimony
Agrimonia parvifloraHarvestlice
Agrimonia pubescensDowny Agrimony
Agrimonia rostellataWoodland Agrimony
Agrostis hyemaliswinter bentgrass
Agrostis perennansupland bentgrass
Alisma subcordatumamerican water-plantain
Alisma trivialenorthern water-plantain
Allium canadenseCanadian Meadow garlic
Allium drummondiiDrummond's Onion
Allium stellatumautumn onion
Allium textileearly onion
Alopecurus aequalisOrange Foxtail
Alopecurus carolinianusCarolina foxtail
Amaranthus blitoidesMat Amaranth
Amaranthus hypochondriacusPrince-of-Wales feather
Amaranthus tuberculatusroughfruit amaranth
Ambrosia acanthicarpaannual bursage
Ambrosia artemisiifoliacommon ragweed
Ambrosia bidentatalanceleaf ragweed
Ambrosia confertifloraweakleaf bur ragweed
