
Geranium maculatum, an Ohio native, is a relative of the common bedding geranium (Pelargonium × hortorum).
This list includes plants native and introduced to the state of Ohio, designated (N) and (I), respectively. Varieties and subspecies link to their parent species.
A
- Abies balsamea var. balsamea (I)
 - Abutilon theophrasti (I)
 - Acalypha deamii (N)
 - Acalypha gracilens (N)
 - Acalypha ostryifolia (N)
 - Acalypha rhomboidea (N)
 - Acalypha virginica (N)
 - Acer campestre (I)
 - Acer × freemanii (N)
 - Acer ginnala (I)
 - Acer negundo var. negundo (N)
 - Acer negundo var. violaceum (N)
 - Acer nigrum (N)
 - Acer palmatum (I)
 - Acer pensylvanicum (N)
 - Acer platanoides (I)
 - Acer rubrum var. rubrum (N)
 - Acer rubrum var. trilobum (N)
 - Acer saccharinum (N)
 - Acer saccharum var. saccharum (N)
 - Acer spicatum (N)
 - Acer tataricum (I)
 - Achillea millefolium var. occidentalis (N)
 - Achillea millefolium var. millefolium (I)
 - Achillea ptarmica (I)
 - Achyranthes japonica var. hachijoensis (I)
 - Acinos arvensis (I)
 - Aconitum noveboracense (N)
 - Aconitum uncinatum ssp. uncinatum (N)
 - Acorus americanus (N)
 - Acorus calamus (I)
 - Acroptilon repens (I)
 - Actaea pachypoda (N)
 - Actaea racemosa var. racemosa (N)
 - Actaea rubra ssp. rubra (N)
 - Actinidia arguta (I)
 - Adenocaulon bicolor (N)
 - Adiantum capillus-veneris (N)
 - Adiantum pedatum (N)
 - Adlumia fungosa (N)
 - Aegilops cylindrica (I)
 - Aegopodium podagraria (I)
 - Aesculus flava (N)
 - Aesculus glabra var. glabra (N)
 - Aesculus hippocastanum (I)
 - Aesculus × marylandica (N)
 - Aethusa cynapium (I)
 - Agalinis auriculata (N)
 - Agalinis gattingeri (N)
 - Agalinis paupercula var. borealis (N)
 - Agalinis paupercula var. paupercula (N)
 - Agalinis purpurea (N)
 - Agalinis skinneriana (N)
 - Agalinis tenuifolia var. macrophylla (N)
 - Agalinis tenuifolia var. parviflora (N)
 - Agalinis tenuifolia var. tenuifolia (N)
 - Agastache nepetoides (N)
 - Agastache scrophulariifolia (N)
 - Ageratina altissima var. altissima (N)
 - Ageratina aromatica var. aromatica (N)
 - Agrimonia eupatoria (I)
 - Agrimonia gryposepala (N)
 - Agrimonia microcarpa (N)
 - Agrimonia parviflora (N)
 - Agrimonia pubescens (N)
 - Agrimonia rostellata (N)
 - Agrimonia striata (N)
 - Agropyron desertorum (I)
 - Agrostemma githago (I)
 - Agrostis avenacea (I)
 - Agrostis capillaris (I)
 - Agrostis elliottiana (N)
 - Agrostis gigantea (I)
 - Agrostis hyemalis (N)
 - Agrostis perennans (N)
 - Agrostis scabra (N)
 - Agrostis stolonifera (I)
 - Ailanthus altissima (I)
 - Aira caryophyllea var. caryophyllea (I)
 - Ajuga genevensis (I)
 - Ajuga reptans (I)
 - Akebia quinata (I)
 - Albizia julibrissin (I)
 - Alcea rosea (I)
 - Aletris farinosa (N)
 - Alisma subcordatum (N)
 - Alisma triviale (N)
 - Alliaria petiolata (I)
 - Allium ampeloprasum (I)
 - Allium burdickii (N)
 - Allium canadense var. canadense (N)
 - Allium cepa (I)
 - Allium cernuum var. cernuum (N)
 - Allium porrum (I)
 - Allium sativum (I)
 - Allium schoenoprasum (I)
 - Allium schoenoprasum var. sibiricum (N)
 - Allium tricoccum (N)
 - Allium vineale ssp. vineale (I)
 - Alnus × fallacina (N)
 - Alnus glutinosa (I)
 - Alnus incana ssp. rugosa (N)
 - Alnus serrulata (N)
 - Alopecurus aequalis var. aequalis (N)
 - Alopecurus carolinianus (N)
 - Alopecurus geniculatus var. geniculatus (I)
 - Alopecurus myosuroides (I)
 - Alopecurus myosuroides (N)
 - Alopecurus pratensis (I)
 - Althaea officinalis (I)
 - Alyssum alyssoides (I)
 - Amaranthus albus (I)
 - Amaranthus blitoides (I)
 - Amaranthus blitum var. emarginatus (I)
 - Amaranthus cruentus (I)
 - Amaranthus deflexus (I)
 - Amaranthus hybridus (N)
 - Amaranthus palmeri (N)
 - Amaranthus powellii ssp. powellii (N)
 - Amaranthus retroflexus (N)
 - Amaranthus spinosus (N)
 - Amaranthus tuberculatus (N)
 - Ambrosia artemisiifolia var. elatior (N)
 - Ambrosia artemisiifolia var. elatior (I)
 - Ambrosia bidentata (N)
 - Ambrosia × helenae (N)
 - Ambrosia trifida var. trifida (N)
 - Amelanchier arborea var. arborea (N)
 - Amelanchier interior (N)
 - Amelanchier laevis (N)
 - Amelanchier sanguinea var. sanguinea (N)
 - Amelanchier stolonifera (N)
 - Ammannia coccinea (N)
 - Ammannia robusta (N)
 - Ammophila breviligulata (N)
 - Amorpha fruticosa (N)
 - Ampelopsis aconitifolia (I)
 - Ampelopsis arborea (N)
 - Ampelopsis glandulosa var. brevipedunculata (I)
 - Ampelopsis cordata (N)
 - Amphiachyris dracunculoides (N)
 - Amphicarpaea bracteata var. bracteata (N)
 - Amphicarpaea bracteata var. comosa (N)
 - Amsinckia lycopsoides (N)
 - Amsonia tabernaemontana var. salicifolia (N)
 - Anagallis arvensis ssp. foemina (N)
 - Anagallis arvensis ssp. arvensis (I)
 - Anagallis arvensis ssp. foemina (I)
 - Anagallis minima (N)
 - Anaphalis margaritacea (N)
 - Anchusa arvensis (I)
 - Anchusa azurea (I)
 - Anchusa officinalis (I)
 - Andromeda polifolia var. glaucophylla (N)
 - Andropogon gerardi (N)
 - Andropogon glomeratus var. glomeratus (N)
 - Andropogon gyrans var. gyrans (N)
 - Andropogon virginicus var. virginicus (N)
 - Androsace occidentalis (N)
 - Anemone blanda (I)
 - Anemone canadensis (N)
 - Anemone cylindrica (N)
 - Anemone quinquefolia var. bifolia (N)
 - Anemone quinquefolia var. quinquefolia (N)
 - Anemone virginiana var. virginiana (N)
 - Anethum graveolens (I)
 - Angelica atropurpurea (N)
 - Angelica venenosa (N)
 - Anoda cristata (N)
 - Antennaria howellii ssp. canadensis (N)
 - Antennaria howellii ssp. neodioica (N)
 - Antennaria howellii ssp. petaloidea (N)
 - Antennaria neglecta (N)
 - Antennaria parlinii ssp. fallax (N)
 - Antennaria parlinii ssp. parlinii (N)
 - Antennaria plantaginifolia (N)
 - Antennaria solitaria (N)
 - Antennaria virginica (N)
 - Anthemis arvensis (I)
 - Anthemis cotula (I)
 - Anthemis tinctoria (I)
 - Anthoxanthum aristatum (I)
 - Anthoxanthum odoratum ssp. odoratum (I)
 - Anthriscus caucalis (I)
 - Anthriscus sylvestris (I)
 - Anthyllis vulneraria (I)
 - Antirrhinum majus (I)
 - Apera interrupta (I)
 - Apera spica-venti (I)
 - Apios americana (N)
 - Apium graveolens var. dulce (N)
 - Apium graveolens var. dulce (I)
 - Aplectrum hyemale (N)
 - Apocynum androsaemifolium (N)
 - Apocynum cannabinum (N)
 - Apocynum × floribundum (N)
 - Aquilegia canadensis (N)
 - Aquilegia vulgaris (I)
 - Arabidopsis thaliana (I)
 - Arabis canadensis (N)
 - Arabis × divaricarpa (N)
 - Arabis drummondii (N)
 - Arabis glabra (N)
 - Arabis hirsuta var. pycnocarpa (N)
 - Arabis laevigata var. laevigata (N)
 - Arabis lyrata (N)
 - Arabis missouriensis (N)
 - Arabis patens (N)
 - Arabis shortii (N)
 - Aralia elata (I)
 - Aralia hispida (N)
 - Aralia nudicaulis (N)
 - Aralia racemosa ssp. racemosa (N)
 - Aralia spinosa (N)
 - Arctium lappa (I)
 - Arctium minus (I)
 - Arctostaphylos uva-ursi (N)
 - Arenaria serpyllifolia (I)
 - Arethusa bulbosa (N)
 - Argemone albiflora ssp. albiflora (N)
 - Argemone mexicana (N)
 - Argentina anserina (N)
 - Arisaema dracontium (N)
 - Arisaema triphyllum ssp. pusillum (N)
 - Arisaema triphyllum ssp. stewardsonii (N)
 - Arisaema triphyllum ssp. triphyllum (N)
 - Aristida dichotoma var. dichotoma (N)
 - Aristida longespica var. geniculata (N)
 - Aristida longespica var. longespica (N)
 - Aristida oligantha (N)
 - Aristida purpurascens var. purpurascens (N)
 - Aristida ramosissima (N)
 - Aristolochia clematitis (I)
 - Aristolochia serpentaria (N)
 - Aristolochia tomentosa (N)
 - Armoracia rusticana (I)
 - Arnoglossum atriplicifolium (N)
 - Arnoglossum plantagineum (N)
 - Arnoglossum reniforme (N)
 - Arnoseris minima (I)
 - Arrhenatherum elatius var. elatius (I)
 - Artemisia absinthium (I)
 - Artemisia annua (I)
 - Artemisia biennis (N)
 - Artemisia biennis var. biennis (I)
 - Artemisia campestris ssp. borealis var. borealis (N)
 - Artemisia campestris ssp. caudata (N)
 - Artemisia gmelinii (I)
 - Artemisia ludoviciana ssp. albula (N)
 - Artemisia ludoviciana ssp. ludoviciana (N)
 - Artemisia pontica (I)
 - Artemisia stelleriana (I)
 - Artemisia stelleriana (N)
 - Artemisia vulgaris (N)
 - Artemisia vulgaris var. vulgaris (I)
 - Arthraxon hispidus (I)
 - Aruncus dioicus (I)
 - Aruncus dioicus var. dioicus (N)
 - Arundinaria gigantea ssp. gigantea (N)
 - Asarum canadense (N)
 - Asclepias amplexicaulis (N)
 - Asclepias exaltata (N)
 - Asclepias hirtella (N)
 - Asclepias incarnata ssp. incarnata (N)
 - Asclepias purpurascens (N)
 - Asclepias quadrifolia (N)
 - Asclepias sullivantii (N)
 - Asclepias syriaca (N)
 - Asclepias tuberosa ssp. interior (N)
 - Asclepias tuberosa ssp. tuberosa (N)
 - Asclepias variegata (N)
 - Asclepias verticillata (N)
 - Asclepias viridiflora (N)
 - Asclepias viridis (N)
 - Asimina triloba (N)
 - Asparagus officinalis (I)
 - Asperugo procumbens (I)
 - Asplenium bradleyi (N)
 - Asplenium × clermontiae (N)
 - Asplenium × ebenoides (N)
 - Asplenium × gravesii (N)
 - Asplenium × inexpectatum (N)
 - Asplenium × kentuckiense (N)
 - Asplenium montanum (N)
 - Asplenium pinnatifidum (N)
 - Asplenium platyneuron var. platyneuron (N)
 - Asplenium resiliens (N)
 - Asplenium rhizophyllum (N)
 - Asplenium ruta-muraria var. cryptolepis (N)
 - Asplenium ruta-muraria var. lanceolum (N)
 - Asplenium trichomanes ssp. quadrivalens (N)
 - Asplenium trichomanes ssp. trichomanes (N)
 - Asplenium × trudellii (N)
 - Aster tataricus (I)
 - Astragalus canadensis var. canadensis (N)
 - Astragalus neglectus (N)
 - Athyrium filix-femina ssp. angustum (N)
 - Athyrium filix-femina ssp. asplenioides (N)
 - Atriplex hortensis (I)
 - Atriplex patula (I)
 - Atriplex prostrata (N)
 - Atriplex rosea (I)
 - Aureolaria flava var. flava (N)
 - Aureolaria flava var. macrantha (N)
 - Aureolaria levigata (N)
 - Aureolaria pedicularia var. ambigens (N)
 - Aureolaria pedicularia var. pedicularia (N)
 - Aureolaria virginica (N)
 - Aurinia saxatilis (I)
 - Avena fatua (I)
 - Avena sativa (I)
 - Azolla caroliniana (N)
 
B
- Ballota nigra var. alba (I)
 - Baptisia alba var. macrophylla (N)
 - Baptisia australis var. australis (N)
 - Baptisia tinctoria (N)
 - Barbarea verna (I)
 - Barbarea vulgaris (I)
 - Bartonia virginica (N)
 - Bassia hirsuta (I)
 - Bassia scoparia (I)
 - Beckmannia syzigachne (N)
 - Belamcanda chinensis (I)
 - Bellis perennis (I)
 - Berberis × ottawensis (N)
 - Berberis thunbergii (I)
 - Berberis vulgaris (I)
 - Berteroa incana (I)
 - Besseya bullii (N)
 - Betula alleghaniensis var. alleghaniensis (N)
 - Betula alleghaniensis var. macrolepis (N)
 - Betula lenta (N)
 - Betula nigra (N)
 - Betula papyrifera var. papyrifera (N)
 - Betula pendula (I)
 - Betula populifolia (N)
 - Betula pubescens (N)
 - Betula pubescens ssp. pubescens (I)
 - Betula pumila var. pumila (N)
 - Betula × purpusii (N)
 - Bidens aristosa (N)
 - Bidens beckii (N)
 - Bidens bipinnata (N)
 - Bidens cernua (N)
 - Bidens connata (N)
 - Bidens coronata (N)
 - Bidens discoidea (N)
 - Bidens frondosa (N)
 - Bidens laevis (N)
 - Bidens tripartita (N)
 - Bidens vulgata (N)
 - Bignonia capreolata (N)
 - Blephilia ciliata (N)
 - Blephilia hirsuta var. hirsuta (N)
 - Boehmeria cylindrica (N)
 - Boltonia asteroides var. recognita (N)
 - Borago officinalis (I)
 - Botrychium biternatum (N)
 - Botrychium dissectum (N)
 - Botrychium lanceolatum var. angustisegmentum (N)
 - Botrychium matricariifolium (N)
 - Botrychium multifidum (N)
 - Botrychium oneidense (N)
 - Botrychium simplex (N)
 - Botrychium virginianum (N)
 - Bouteloua curtipendula var. curtipendula (N)
 - Bouteloua gracilis (N)
 - Bouteloua hirsuta var. hirsuta (N)
 - Brachyelytrum erectum (N)
 - Brasenia schreberi (N)
 - Brassica juncea (I)
 - Brassica napus (I)
 - Brassica nigra (I)
 - Brassica oleracea (I)
 - Brassica rapa var. amplexicaulis (I)
 - Brassica rapa var. rapa (I)
 - Brickellia eupatorioides var. corymbulosa (N)
 - Brickellia eupatorioides var. eupatorioides (N)
 - Bromus arvensis (I)
 - Bromus briziformis (I)
 - Bromus catharticus (I)
 - Bromus ciliatus var. ciliatus (N)
 - Bromus erectus (I)
 - Bromus hordeaceus ssp. hordeaceus (I)
 - Bromus inermis (N)
 - Bromus inermis ssp. inermis var. inermis (I)
 - Bromus kalmii (N)
 - Bromus latiglumis (N)
 - Bromus nottowayanus (N)
 - Bromus pubescens (N)
 - Bromus racemosus (I)
 - Bromus secalinus var. secalinus (I)
 - Bromus sterilis (I)
 - Bromus tectorum (I)
 - Broussonetia papyrifera (I)
 - Browallia americana (I)
 - Brunnera macrophylla (I)
 - Buchnera americana (N)
 - Buddleja davidii (I)
 - Buglossoides arvensis (I)
 - Bulbostylis capillaris ssp. capillaris (N)
 - Bunias orientalis (I)
 - Bupleurum lancifolium (I)
 - Bupleurum rotundifolium (I)
 - Butomus umbellatus (I)
 - Buxus sempervirens (I)
 
C
- Cabomba caroliniana var. caroliniana (N)
 - Cakile edentula ssp. edentula var. lacustris (N)
 - Cakile edentula ssp. edentula (N)
 - Calamagrostis canadensis var. canadensis (N)
 - Calamagrostis canadensis var. macouniana (N)
 - Calamagrostis coarctata (N)
 - Calamagrostis porteri ssp. insperata (N)
 - Calamagrostis stricta ssp. inexpansa (N)
 - Calamovilfa longifolia var. magna (N)
 - Calendula officinalis (I)
 - Calla palustris (N)
 - Callitriche heterophylla ssp. heterophylla (N)
 - Callitriche palustris (N)
 - Callitriche terrestris (N)
 - Calluna vulgaris (I)
 - Calopogon tuberosus var. tuberosus (N)
 - Caltha palustris var. palustris (N)
 - Calycanthus floridus var. glaucus (N)
 - Calystegia hederacea (I)
 - Calystegia sepium ssp. americana (N)
 - Calystegia sepium ssp. angulata (N)
 - Calystegia sepium ssp. sepium (I)
 - Calystegia silvatica (I)
 - Calystegia silvatica ssp. fraterniflora (N)
 - Calystegia spithamaea ssp. spithamaea (N)
 - Camassia scilloides (N)
 - Camelina microcarpa (I)
 - Camelina sativa ssp. sativa (I)
 - Campanula aparinoides (N)
 - Campanula rapunculoides (I)
 - Campanula rotundifolia (N)
 - Campanula trachelium (I)
 - Campanulastrum americanum (N)
 - Campsis radicans (N)
 - Cannabis sativa ssp. sativa var. sativa (I)
 - Capsella bursa-pastoris (I)
 - Cardamine angustata (N)
 - Cardamine bulbifera (I)
 - Cardamine bulbosa (N)
 - Cardamine concatenata (N)
 - Cardamine diphylla (N)
 - Cardamine dissecta (N)
 - Cardamine douglassii (N)
 - Cardamine flexuosa (I)
 - Cardamine hirsuta (I)
 - Cardamine impatiens (I)
 - Cardamine maxima (N)
 - Cardamine parviflora var. arenicola (N)
 - Cardamine pensylvanica (N)
 - Cardamine pratensis var. pratensis (N)
 - Cardamine rotundifolia (N)
 - Cardaria draba (I)
 - Cardiospermum halicacabum (I)
 - Carduus acanthoides (I)
 - Carduus crispus (I)
 - Carduus nutans (I)
 - Carex aggregata (N)
 - Carex alata (N)
 - Carex albicans var. albicans (N)
 - Carex albicans var. emmonsii (N)
 - Carex albolutescens (N)
 - Carex albursina (N)
 - Carex alopecoidea (N)
 - Carex amphibola (N)
 - Carex annectens (N)
 - Carex appalachica (N)
 - Carex aquatilis var. aquatilis (N)
 - Carex arctata (N)
 - Carex argyrantha (N)
 - Carex atherodes (N)
 - Carex atlantica ssp. atlantica (N)
 - Carex atlantica ssp. capillacea (N)
 - Carex aurea (N)
 - Carex bebbii (N)
 - Carex bicknellii (N)
 - Carex blanda (N)
 - Carex brevior (N)
 - Carex bromoides ssp. bromoides (N)
 - Carex brunnescens ssp. sphaerostachya (N)
 - Carex bushii (N)
 - Carex buxbaumii (N)
 - Carex canescens ssp. canescens (N)
 - Carex canescens ssp. disjuncta (N)
 - Carex careyana (N)
 - Carex caroliniana (N)
 - Carex cephaloidea (N)
 - Carex cephalophora (N)
 - Carex communis var. communis (N)
 - Carex comosa (N)
 - Carex conjuncta (N)
 - Carex conoidea (N)
 - Carex crawei (N)
 - Carex crinita var. brevicrinis (N)
 - Carex crinita var. crinita (N)
 - Carex cristatella (N)
 - Carex crus-corvi (N)
 - Carex cryptolepis (N)
 - Carex cumberlandensis (N)
 - Carex davisii (N)
 - Carex debilis var. debilis (N)
 - Carex debilis var. rudgei (N)
 - Carex decomposita (N)
 - Carex deweyana var. deweyana (N)
 - Carex diandra (N)
 - Carex digitalis var. digitalis (N)
 - Carex disperma (N)
 - Carex eburnea (N)
 - Carex echinata ssp. echinata (N)
 - Carex emoryi (N)
 - Carex festucacea (N)
 - Carex flava (N)
 - Carex folliculata (N)
 - Carex formosa (N)
 - Carex frankii (N)
 - Carex garberi (N)
 - Carex glaucodea (N)
 - Carex gracilescens (N)
 - Carex gracillima (N)
 - Carex granularis (N)
 - Carex grayi (N)
 - Carex grisea (N)
 - Carex gynandra (N)
 - Carex haydenii (N)
 - Carex hirsutella (N)
 - Carex hirtifolia (N)
 - Carex hitchcockiana (N)
 - Carex hyalinolepis (N)
 - Carex hystericina (N)
 - Carex interior (N)
 - Carex intumescens (N)
 - Carex jamesii (N)
 - Carex juniperorum (N)
 - Carex lacustris (N)
 - Carex laevivaginata (N)
 - Carex lasiocarpa var. americana (N)
 - Carex laxiculmis var. copulata (N)
 - Carex laxiculmis var. laxiculmis (N)
 - Carex laxiflora var. laxiflora (N)
 - Carex leavenworthii (N)
 - Carex leptalea ssp. leptalea (N)
 - Carex leptonervia (N)
 - Carex limosa (N)
 - Carex longii (N)
 - Carex louisianica (N)
 - Carex lucorum var. lucorum (N)
 - Carex lupuliformis (N)
 - Carex lupulina (N)
 - Carex lurida (N)
 - Carex magellanica ssp. irrigua (N)
 - Carex meadii (N)
 - Carex merritt-fernaldii (N)
 - Carex mesochorea (N)
 - Carex molesta (N)
 - Carex muehlenbergii var. enervis (N)
 - Carex muehlenbergii var. muehlenbergii (N)
 - Carex muskingumensis (N)
 - Carex nigromarginata (N)
 - Carex normalis (N)
 - Carex oligocarpa (N)
 - Carex oligosperma var. oligosperma (N)
 - Carex pallescens (N)
 - Carex peckii (N)
 - Carex pedunculata (N)
 - Carex pellita (N)
 - Carex pensylvanica (N)
 - Carex planispicata (N)
 - Carex plantaginea (N)
 - Carex platyphylla (N)
 - Carex praegracilis (N)
 - Carex prairea (N)
 - Carex prasina (N)
 - Carex projecta (N)
 - Carex pseudocyperus (N)
 - Carex purpurifera (N)
 - Carex radiata (N)
 - Carex retroflexa (N)
 - Carex retrorsa (N)
 - Carex richardsonii (N)
 - Carex rosea (N)
 - Carex sartwellii var. sartwellii (N)
 - Carex scabrata (N)
 - Carex scoparia var. scoparia (N)
 - Carex seorsa (N)
 - Carex shortiana (N)
 - Carex siccata (N)
 - Carex sparganioides (N)
 - Carex spicata (I)
 - Carex sprengelii (N)
 - Carex squarrosa (N)
 - Carex sterilis (N)
 - Carex stipata var. maxima (N)
 - Carex stipata var. stipata (N)
 - Carex straminea (N)
 - Carex striatula (N)
 - Carex stricta (N)
 - Carex styloflexa (N)
 - Carex suberecta (N)
 - Carex × subimpressa (N)
 - Carex × sullivantii (N)
 - Carex swanii (N)
 - Carex tenera (N)
 - Carex tenuiflora (N)
 - Carex tetanica (N)
 - Carex texensis (N)
 - Carex timida (N)
 - Carex tonsa var. rugosperma (N)
 - Carex torta (N)
 - Carex tribuloides var. tribuloides (N)
 - Carex trichocarpa (N)
 - Carex trisperma var. trisperma (N)
 - Carex tuckermanii (N)
 - Carex typhina (N)
 - Carex umbellata (N)
 - Carex utriculata (N)
 - Carex vesicaria var. monile (N)
 - Carex virescens (N)
 - Carex viridula ssp. viridula (N)
 - Carex vulpinoidea var. vulpinoidea (N)
 - Carex willdenowii (N)
 - Carex woodii (N)
 - Carpinus caroliniana ssp. virginiana (N)
 - Carthamus tinctorius (I)
 - Carum carvi (I)
 - Carya alba (N)
 - Carya × brownii (N)
 - Carya cordiformis (N)
 - Carya glabra (N)
 - Carya illinoinensis (N)
 - Carya laciniosa (N)
 - Carya ovalis (N)
 - Carya ovata (N)
 - Castanea dentata (N)
 - Castanea pumila var. pumila (N)
 - Castilleja coccinea (N)
 - Catalpa bignonioides (N)
 - Catalpa ovata (I)
 - Catalpa speciosa (N)
 - Caulophyllum giganteum (N)
 - Caulophyllum thalictroides (N)
 - Ceanothus americanus (N)
 - Ceanothus herbaceus (N)
 - Celastrus orbiculatus (I)
 - Celastrus scandens (N)
 - Celosia argentea (I)
 - Celtis occidentalis (N)
 - Celtis tenuifolia (N)
 - Cenchrus longispinus (N)
 - Centaurea cyanus (I)
 - Centaurea diffusa (I)
 - Centaurea jacea (I)
 - Centaurea nigra (I)
 - Centaurea nigrescens (I)
 - Centaurea phrygia (I)
 - Centaurea scabiosa (I)
 - Centaurea solstitialis (I)
 - Centaurea stoebe ssp. micranthos (I)
 - Centaurea transalpina (N)
 - Centaurium erythraea (I)
 - Centaurium pulchellum (I)
 - Centella erecta (N)
 - Cephalanthus occidentalis (N)
 - Cerastium arvense (I)
 - Cerastium arvense ssp. strictum (N)
 - Cerastium arvense ssp. velutinum var. velutinum (N)
 - Cerastium arvense ssp. velutinum (N)
 - Cerastium brachypetalum (I)
 - Cerastium dubium (I)
 - Cerastium fontanum ssp. vulgare (I)
 - Cerastium glomeratum (I)
 - Cerastium nutans var. nutans (N)
 - Cerastium pumilum (I)
 - Cerastium semidecandrum (I)
 - Cerastium tomentosum (I)
 - Ceratocephala testiculata (I)
 - Ceratophyllum demersum (N)
 - Ceratophyllum echinatum (N)
 - Cercidiphyllum japonicum (I)
 - Cercis canadensis var. canadensis (N)
 - Chaenomeles speciosa (I)
 - Chaenorhinum minus (I)
 - Chaerophyllum procumbens var. procumbens (N)
 - Chaerophyllum procumbens var. shortii (N)
 - Chaerophyllum tainturieri var. tainturieri (N)
 - Chaiturus marrubiastrum (I)
 - Chamaecrista fasciculata var. fasciculata (N)
 - Chamaecrista nictitans ssp. nictitans var. nictitans (N)
 - Chamaecrista nictitans ssp. nictitans (N)
 - Chamaedaphne calyculata (N)
 - Chamaelirium luteum (N)
 - Chamaemelum mixtum (I)
 - Chamaemelum nobile (I)
 - Chamaesyce humistrata (N)
 - Chamaesyce maculata (N)
 - Chamaesyce nutans (N)
 - Chamaesyce polygonifolia (N)
 - Chamaesyce prostrata (N)
 - Chamaesyce serpens (N)
 - Chamaesyce vermiculata (N)
 - Chamerion angustifolium ssp. circumvagum (N)
 - Chasmanthium latifolium (N)
 - Chelidonium majus var. majus (I)
 - Chelone glabra (N)
 - Chenopodium album var. missouriense (N)
 - Chenopodium album var. album (I)
 - Chenopodium ambrosioides var. ambrosioides (I)
 - Chenopodium berlandieri var. bushianum (N)
 - Chenopodium berlandieri var. zschackii (N)
 - Chenopodium botrys (I)
 - Chenopodium capitatum (N)
 - Chenopodium glaucum (I)
 - Chenopodium glaucum (N)
 - Chenopodium humile (I)
 - Chenopodium humile (N)
 - Chenopodium incanum var. incanum (N)
 - Chenopodium murale (I)
 - Chenopodium polyspermum var. acutifolium (I)
 - Chenopodium pratericola (N)
 - Chenopodium pumilio (I)
 - Chenopodium simplex (N)
 - Chenopodium standleyanum (N)
 - Chenopodium subglabrum (N)
 - Chenopodium urbicum (I)
 - Chenopodium vulvaria (I)
 - Chimaphila maculata (N)
 - Chimaphila umbellata ssp. cisatlantica (N)
 - Chionanthus virginicus (N)
 - Chloris verticillata (N)
 - Chloris virgata (N)
 - Chorispora tenella (I)
 - Chrysanthemum × morifolium (I)
 - Chrysogonum virginianum var. virginianum (N)
 - Chrysopsis mariana (N)
 - Chrysosplenium americanum (N)
 - Cichorium intybus (I)
 - Cicuta bulbifera (N)
 - Cicuta maculata var. maculata (N)
 - Cinna arundinacea (N)
 - Cinna latifolia (N)
 - Circaea alpina ssp. alpina (N)
 - Circaea × intermedia (N)
 - Circaea lutetiana ssp. canadensis (N)
 - Cirsium altissimum (N)
 - Cirsium arvense (I)
 - Cirsium canescens (N)
 - Cirsium carolinianum (N)
 - Cirsium discolor (N)
 - Cirsium muticum (N)
 - Cirsium pumilum (N)
 - Cirsium vulgare (I)
 - Citrullus lanatus var. lanatus (I)
 - Cladium mariscoides (N)
 - Cladrastis kentukea (N)
 - Clarkia pulchella (N)
 - Claytonia caroliniana var. caroliniana (N)
 - Claytonia virginica var. virginica (N)
 - Clematis occidentalis var. occidentalis (N)
 - Clematis terniflora (I)
 - Clematis viorna (N)
 - Clematis virginiana (N)
 - Cleome hassleriana (I)
 - Cleome serrulata (N)
 - Clinopodium arkansanum (N)
 - Clinopodium vulgare (N)
 - Clintonia borealis (N)
 - Clintonia umbellulata (N)
 - Clitoria mariana (N)
 - Coix lacryma-jobi (I)
 - Collinsia verna (N)
 - Collinsonia canadensis (N)
 - Collinsonia verticillata (N)
 - Collomia linearis (N)
 - Colutea arborescens (I)
 - Comandra umbellata ssp. umbellata (N)
 - Comarum palustre (N)
 - Commelina communis (I)
 - Commelina diffusa var. diffusa (N)
 - Commelina virginica (N)
 - Comptonia peregrina (N)
 - Conioselinum chinense (N)
 - Conium maculatum (I)
 - Conoclinium coelestinum (N)
 - Conopholis americana (N)
 - Conringia orientalis (I)
 - Consolida ajacis (I)
 - Consolida regalis (I)
 - Convallaria majalis (I)
 - Convolvulus arvensis (I)
 - Conyza canadensis var. canadensis (N)
 - Conyza canadensis var. pusilla (N)
 - Conyza ramosissima (N)
 - Coptis trifolia (N)
 - Corallorhiza maculata var. maculata (N)
 - Corallorhiza odontorhiza var. odontorhiza (N)
 - Corallorhiza trifida (N)
 - Corallorhiza wisteriana (N)
 - Coreopsis grandiflora var. harveyana (N)
 - Coreopsis lanceolata (N)
 - Coreopsis major (N)
 - Coreopsis tinctoria var. tinctoria (N)
 - Coreopsis tripteris (N)
 - Coreopsis verticillata (N)
 - Coriandrum sativum (I)
 - Corispermum americanum var. americanum (N)
 - Corispermum pallasii (I)
 - Corispermum pallasii (N)
 - Cornus alternifolia (N)
 - Cornus amomum (N)
 - Cornus × arnoldiana (N)
 - Cornus canadensis (N)
 - Cornus drummondii (N)
 - Cornus florida (N)
 - Cornus obliqua (N)
 - Cornus racemosa (N)
 - Cornus rugosa (N)
 - Cornus sericea ssp. sericea (N)
 - Coronilla scorpioides (I)
 - Coronopus didymus (I)
 - Corydalis aurea (N)
 - Corydalis flavula (N)
 - Corydalis sempervirens (N)
 - Corylus americana (N)
 - Corylus cornuta var. cornuta (N)
 - Cosmos bipinnatus (I)
 - Cotinus coggygria (I)
 - Cotoneaster divaricatus (I)
 - Cotoneaster simonsii (I)
 - Crataegus × anomala (N)
 - Crataegus apiomorpha (N)
 - Crataegus arborea (N)
 - Crataegus ater (N)
 - Crataegus beata (N)
 - Crataegus brainerdii (N)
 - Crataegus calpodendron (N)
 - Crataegus chrysocarpa var. chrysocarpa (N)
 - Crataegus coleae (N)
 - Crataegus compacta (N)
 - Crataegus compta (N)
 - Crataegus corusca (N)
 - Crataegus crus-galli (N)
 - Crataegus disperma (N)
 - Crataegus dissona (N)
 - Crataegus engelmannii (N)
 - Crataegus flabellata (N)
 - Crataegus holmesiana (N)
 - Crataegus × hudsonica (N)
 - Crataegus × immanis (N)
 - Crataegus indicens (N)
 - Crataegus intricata (N)
 - Crataegus iracunda (N)
 - Crataegus irrasa (N)
 - Crataegus jesupii (N)
 - Crataegus lucorum (N)
 - Crataegus macrosperma (N)
 - Crataegus margarettiae (N)
 - Crataegus mollis (N)
 - Crataegus monogyna (I)
 - Crataegus nitida (N)
 - Crataegus pedicellata (N)
 - Crataegus pennsylvanica (N)
 - Crataegus persimilis (N)
 - Crataegus phaenopyrum (N)
 - Crataegus pringlei (N)
 - Crataegus prona (N)
 - Crataegus pruinosa (N)
 - Crataegus punctata (N)
 - Crataegus scabrida (N)
 - Crataegus schuettei (N)
 - Crataegus submollis (N)
 - Crataegus suborbiculata (N)
 - Crataegus succulenta (N)
 - Crataegus tanuphylla (N)
 - Crataegus uniflora (N)
 - Crepis biennis (I)
 - Crepis capillaris (I)
 - Crepis nicaeensis (I)
 - Crepis pulchra (I)
 - Crepis setosa (I)
 - Crepis tectorum (I)
 - Crotalaria sagittalis (N)
 - Croton capitatus var. capitatus (N)
 - Croton glandulosus var. septentrionalis (N)
 - Croton monanthogynus (N)
 - Cruciata pedemontana (I)
 - Crypsis schoenoides (I)
 - Cryptotaenia canadensis (N)
 - Cucumis melo (I)
 - Cucumis sativus (I)
 - Cucurbita foetidissima (N)
 - Cucurbita maxima (I)
 - Cucurbita pepo (N)
 - Cucurbita pepo var. pepo (I)
 - Cunila origanoides (N)
 - Cuphea viscosissima (N)
 - Cuscuta cephalanthi (N)
 - Cuscuta compacta var. compacta (N)
 - Cuscuta coryli (N)
 - Cuscuta epilinum (I)
 - Cuscuta epithymum (I)
 - Cuscuta glomerata (N)
 - Cuscuta gronovii var. gronovii (N)
 - Cuscuta pentagona var. pentagona (N)
 - Cuscuta polygonorum (N)
 - Cuscuta suaveolens (I)
 - Cyclachaena xanthifolia (N)
 - Cycloloma atriplicifolium (N)
 - Cydonia oblonga (I)
 - Cymbalaria muralis (I)
 - Cynanchum laeve (N)
 - Cynanchum louiseae (I)
 - Cynodon dactylon (I)
 - Cynoglossum officinale (I)
 - Cynoglossum virginianum var. boreale (N)
 - Cynoglossum virginianum var. virginianum (N)
 - Cynosurus cristatus (I)
 - Cynosurus echinatus (I)
 - Cyperus acuminatus (N)
 - Cyperus amuricus (I)
 - Cyperus bipartitus (N)
 - Cyperus compressus (N)
 - Cyperus diandrus (N)
 - Cyperus echinatus (N)
 - Cyperus erythrorhizos (N)
 - Cyperus esculentus (N)
 - Cyperus esculentus var. leptostachyus (I)
 - Cyperus flavescens (N)
 - Cyperus houghtonii (N)
 - Cyperus iria (I)
 - Cyperus lancastriensis (N)
 - Cyperus lupulinus ssp. lupulinus (N)
 - Cyperus lupulinus ssp. macilentus (N)
 - Cyperus odoratus (N)
 - Cyperus refractus (N)
 - Cyperus retrofractus (N)
 - Cyperus schweinitzii (N)
 - Cyperus squarrosus (N)
 - Cyperus strigosus (N)
 - Cypripedium acaule (N)
 - Cypripedium × andrewsii var. andrewsii (N)
 - Cypripedium × andrewsii var. landonii (N)
 - Cypripedium candidum (N)
 - Cypripedium parviflorum var. parviflorum (N)
 - Cypripedium parviflorum var. pubescens (N)
 - Cypripedium reginae (N)
 - Cyrtomium falcatum (I)
 - Cystopteris bulbifera (N)
 - Cystopteris fragilis (N)
 - Cystopteris × illinoensis (N)
 - Cystopteris protrusa (N)
 - Cystopteris tennesseensis (N)
 - Cystopteris tenuis (N)
 - Cystopteris × wagneri (N)
 - Cytisus scoparius var. scoparius (I)
 
D
- Dactylis glomerata ssp. glomerata (I)
 - Dactyloctenium aegyptium (I)
 - Dactylorhiza viridis (N)
 - Dalea leporina (N)
 - Dalea purpurea var. purpurea (N)
 - Dalibarda repens (N)
 - Danthonia compressa (N)
 - Danthonia spicata (N)
 - Daphne mezereum (I)
 - Dasiphora fruticosa ssp. floribunda (N)
 - Dasistoma macrophylla (N)
 - Datura stramonium (I)
 - Datura wrightii (N)
 - Daucus carota (I)
 - Decodon verticillatus (N)
 - Delphinium exaltatum (N)
 - Delphinium tricorne (N)
 - Dennstaedtia punctilobula (N)
 - Deparia acrostichoides (N)
 - Deschampsia cespitosa (N)
 - Deschampsia danthonioides (N)
 - Deschampsia flexuosa var. flexuosa (N)
 - Descurainia pinnata ssp. brachycarpa (N)
 - Descurainia sophia (I)
 - Desmanthus illinoensis (N)
 - Desmodium canadense (N)
 - Desmodium canescens (N)
 - Desmodium ciliare var. ciliare (N)
 - Desmodium cuspidatum var. cuspidatum (N)
 - Desmodium cuspidatum var. longifolium (N)
 - Desmodium glutinosum (N)
 - Desmodium illinoense (N)
 - Desmodium laevigatum (N)
 - Desmodium marilandicum (N)
 - Desmodium nudiflorum (N)
 - Desmodium obtusum (N)
 - Desmodium paniculatum var. paniculatum (N)
 - Desmodium pauciflorum (N)
 - Desmodium perplexum (N)
 - Desmodium rotundifolium (N)
 - Desmodium sessilifolium (N)
 - Desmodium viridiflorum (N)
 - Dianthus armeria (I)
 - Dianthus barbatus (I)
 - Dianthus deltoides (I)
 - Dianthus plumarius (I)
 - Diarrhena americana (N)
 - Diarrhena obovata (N)
 - Dicentra canadensis (N)
 - Dicentra cucullaria (N)
 - Dicentra eximia (N)
 - Dichanthelium acuminatum var. acuminatum (N)
 - Dichanthelium acuminatum var. fasciculatum (N)
 - Dichanthelium acuminatum var. lindheimeri (N)
 - Dichanthelium boreale (N)
 - Dichanthelium boscii (N)
 - Dichanthelium clandestinum (N)
 - Dichanthelium commutatum (N)
 - Dichanthelium depauperatum (N)
 - Dichanthelium dichotomum var. dichotomum (N)
 - Dichanthelium latifolium (N)
 - Dichanthelium laxiflorum (N)
 - Dichanthelium leibergii (N)
 - Dichanthelium linearifolium (N)
 - Dichanthelium longiligulatum (N)
 - Dichanthelium meridionale (N)
 - Dichanthelium oligosanthes var. oligosanthes (N)
 - Dichanthelium oligosanthes var. scribnerianum (N)
 - Dichanthelium ovale var. addisonii (N)
 - Dichanthelium sabulorum var. patulum (N)
 - Dichanthelium sabulorum var. thinium (N)
 - Dichanthelium sphaerocarpon var. isophyllum (N)
 - Dichanthelium sphaerocarpon var. sphaerocarpon (N)
 - Dichanthelium spretum (N)
 - Dichanthelium villosissimum var. praecocius (N)
 - Dichondra carolinensis (N)
 - Diervilla lonicera (N)
 - Digitalis grandiflora (I)
 - Digitalis lanata (I)
 - Digitalis lutea (I)
 - Digitalis purpurea ssp. purpurea (I)
 - Digitaria ciliaris (N)
 - Digitaria cognata (N)
 - Digitaria filiformis (N)
 - Digitaria ischaemum (I)
 - Digitaria sanguinalis (N)
 - Diodia teres var. teres (N)
 - Diodia virginiana var. virginiana (N)
 - Dioscorea polystachya (I)
 - Dioscorea quaternata (N)
 - Dioscorea villosa (N)
 - Diospyros virginiana (N)
 - Diplazium pycnocarpon (N)
 - Diplotaxis muralis (I)
 - Diplotaxis tenuifolia (I)
 - Dipsacus fullonum (I)
 - Dipsacus laciniatus (I)
 - Dipsacus sativus (I)
 - Dirca palustris (N)
 - Distichlis spicata (N)
 - Dodecatheon meadia ssp. meadia (N)
 - Doellingeria infirma (N)
 - Doellingeria umbellata var. umbellata (N)
 - Draba brachycarpa (N)
 - Draba cuneifolia var. cuneifolia (N)
 - Draba reptans (N)
 - Draba verna (I)
 - Dracocephalum parviflorum (N)
 - Drosera intermedia (N)
 - Drosera rotundifolia var. rotundifolia (N)
 - Dryopteris × benedictii (N)
 - Dryopteris × boottii (N)
 - Dryopteris carthusiana (N)
 - Dryopteris clintoniana (N)
 - Dryopteris cristata (N)
 - Dryopteris goldieana (N)
 - Dryopteris intermedia (N)
 - Dryopteris marginalis (N)
 - Dryopteris × mickelii (N)
 - Dryopteris × neowherryi (N)
 - Dryopteris × pittsfordensis (N)
 - Dryopteris × slossoniae (N)
 - Dryopteris × triploidea (N)
 - Dryopteris × uliginosa (N)
 - Duchesnea indica (I)
 - Dulichium arundinaceum var. arundinaceum (N)
 - Dyssodia papposa (N)
 
E
- Echinacea purpurea (N)
 - Echinochloa crus-galli (I)
 - Echinochloa frumentacea (I)
 - Echinochloa muricata var. microstachya (N)
 - Echinochloa muricata var. muricata (N)
 - Echinochloa walteri (N)
 - Echinocystis lobata (N)
 - Echinodorus berteroi (N)
 - Echium vulgare (I)
 - Eclipta prostrata (N)
 - Egeria densa (I)
 - Elaeagnus angustifolia (I)
 - Elaeagnus multiflora (I)
 - Elaeagnus umbellata var. parvifolia (I)
 - Elatine brachysperma (N)
 - Eleocharis acicularis var. acicularis (N)
 - Eleocharis compressa var. compressa (N)
 - Eleocharis elliptica (N)
 - Eleocharis engelmannii (N)
 - Eleocharis erythropoda (N)
 - Eleocharis geniculata (N)
 - Eleocharis intermedia (N)
 - Eleocharis obtusa (N)
 - Eleocharis olivacea var. olivacea (N)
 - Eleocharis ovata (N)
 - Eleocharis palustris var. palustris (N)
 - Eleocharis parvula (N)
 - Eleocharis quadrangulata (N)
 - Eleocharis quinqueflora (N)
 - Eleocharis rostellata (N)
 - Eleocharis tenuis var. tenuis (N)
 - Eleocharis tenuis var. verrucosa (N)
 - Eleocharis wolfii (N)
 - Elephantopus carolinianus (N)
 - Eleusine indica (I)
 - Ellisia nyctelea (N)
 - Elodea canadensis (N)
 - Elodea nuttallii (N)
 - Elymus canadensis (N)
 - Elymus hystrix var. bigeloviana (N)
 - Elymus hystrix var. hystrix (N)
 - Elymus repens (I)
 - Elymus riparius (N)
 - Elymus submuticus (N)
 - Elymus trachycaulus ssp. subsecundus (N)
 - Elymus trachycaulus ssp. trachycaulus (N)
 - Elymus villosus (N)
 - Elymus virginicus var. virginicus (N)
 - Enemion biternatum (N)
 - Epifagus virginiana (N)
 - Epigaea repens (N)
 - Epilobium ciliatum ssp. ciliatum (N)
 - Epilobium ciliatum ssp. glandulosum (N)
 - Epilobium coloratum (N)
 - Epilobium hirsutum (I)
 - Epilobium leptophyllum (N)
 - Epilobium parviflorum (I)
 - Epilobium strictum (N)
 - Epilobium × wisconsinense (N)
 - Epipactis helleborine (I)
 - Equisetum arvense (N)
 - Equisetum × ferrissii (N)
 - Equisetum fluviatile (N)
 - Equisetum hyemale var. affine (N)
 - Equisetum laevigatum (N)
 - Equisetum × mackaii (N)
 - Equisetum × nelsonii (N)
 - Equisetum sylvaticum (N)
 - Equisetum variegatum var. variegatum (N)
 - Eragrostis capillaris (N)
 - Eragrostis cilianensis (I)
 - Eragrostis curvula (I)
 - Eragrostis frankii (N)
 - Eragrostis hirsuta (N)
 - Eragrostis hypnoides (N)
 - Eragrostis minor (I)
 - Eragrostis pectinacea var. miserrima (N)
 - Eragrostis pectinacea var. pectinacea (N)
 - Eragrostis pilosa (N)
 - Eragrostis spectabilis (N)
 - Eragrostis trichodes (N)
 - Eranthis hyemalis (I)
 - Erechtites hieraciifolia var. hieraciifolia (N)
 - Erica tetralix (I)
 - Erigenia bulbosa (N)
 - Erigeron annuus (N)
 - Erigeron philadelphicus var. philadelphicus (N)
 - Erigeron pulchellus var. brauniae (N)
 - Erigeron pulchellus var. pulchellus (N)
 - Erigeron strigosus var. strigosus (N)
 - Eriocaulon aquaticum (N)
 - Eriochloa contracta (N)
 - Eriophorum gracile var. gracile (N)
 - Eriophorum virginicum (N)
 - Eriophorum viridicarinatum (N)
 - Erodium cicutarium ssp. cicutarium (I)
 - Erucastrum gallicum (I)
 - Eryngium yuccifolium var. yuccifolium (N)
 - Erysimum capitatum var. capitatum (N)
 - Erysimum cheiranthoides (I)
 - Erysimum inconspicuum var. inconspicuum (N)
 - Erysimum repandum (I)
 - Erythronium albidum (N)
 - Erythronium americanum ssp. americanum (N)
 - Erythronium rostratum (N)
 - Eschscholzia californica ssp. californica (N)
 - Eubotrys recurva (N)
 - Euonymus alatus var. alatus (I)
 - Euonymus americanus (N)
 - Euonymus atropurpureus var. atropurpureus (N)
 - Euonymus europaeus (I)
 - Euonymus fortunei var. radicans (I)
 - Euonymus obovatus (N)
 - Eupatoriadelphus fistulosus (N)
 - Eupatoriadelphus maculatus var. maculatus (N)
 - Eupatorium album var. album (N)
 - Eupatorium altissimum (N)
 - Eupatorium godfreyanum (N) (a hybrid of Eupatorium rotundifolium and Eupatorium sessilifolium)
 - Eupatorium hyssopifolium var. laciniatum (N)
 - Eupatorium perfoliatum var. perfoliatum (N)
 - Eupatorium purpureum var. purpureum (N)
 - Eupatorium rotundifolium var. ovatum (N)
 - Eupatorium rotundifolium var. rotundifolium (N)
 - Eupatorium serotinum (N)
 - Eupatorium sessilifolium var. sessilifolium (N)
 - Euphorbia commutata (N)
 - Euphorbia corollata (N)
 - Euphorbia cyathophora (N)
 - Euphorbia cyparissias (I)
 - Euphorbia davidii (I)
 - Euphorbia dentata (I)
 - Euphorbia dentata var. dentata (N)
 - Euphorbia esula var. esula (I)
 - Euphorbia falcata (I)
 - Euphorbia helioscopia (I)
 - Euphorbia lathyris (I)
 - Euphorbia marginata (N)
 - Euphorbia peplus (I)
 - Euphorbia platyphyllos (I)
 - Euphorbia purpurea (N)
 - Euphorbia spathulata (N)
 - Eurybia divaricata (N)
 - Eurybia macrophylla (N)
 - Eurybia schreberi (N)
 - Eurybia surculosa (N)
 - Euthamia graminifolia var. graminifolia (N)
 - Euthamia gymnospermoides (N)
 
F
- Fagopyrum esculentum (I)
 - Fagus grandifolia (N)
 - Fagus sylvatica (I)
 - Fatoua villosa (I)
 - Festuca brevipila (I)
 - Festuca filiformis (I)
 - Festuca rubra (I)
 - Festuca rubra ssp. rubra (N)
 - Festuca subverticillata (N)
 - Filago vulgaris (I)
 - Filipendula rubra (N)
 - Filipendula ulmaria ssp. ulmaria (I)
 - Fimbristylis autumnalis (N)
 - Fleischmannia incarnata (N)
 - Floerkea proserpinacoides (N)
 - Foeniculum vulgare (I)
 - Fontanesia phillyreoides ssp. fortunei (I)
 - Forsythia × intermedia (I)
 - Forsythia suspensa (I)
 - Fragaria vesca ssp. americana (N)
 - Fragaria vesca ssp. vesca (N)
 - Fragaria virginiana ssp. grayana (N)
 - Fragaria virginiana ssp. virginiana (N)
 - Frangula alnus (I)
 - Frangula alnus (N)
 - Frangula caroliniana (N)
 - Frasera caroliniensis (N)
 - Fraxinus americana (N)
 - Fraxinus excelsior (I)
 - Fraxinus nigra (N)
 - Fraxinus pennsylvanica (N)
 - Fraxinus profunda (N)
 - Fraxinus quadrangulata (N)
 - Froelichia floridana var. campestris (N)
 - Froelichia gracilis (N)
 - Fumaria officinalis ssp. officinalis (I)
 
G
- Gaillardia pulchella var. pulchella (N)
 - Galactia volubilis (N)
 - Galanthus elwesii (I)
 - Galanthus nivalis (I)
 - Galax urceolata (N)
 - Galearis spectabilis (N)
 - Galeopsis bifida (I)
 - Galeopsis ladanum var. ladanum (I)
 - Galeopsis tetrahit var. tetrahit (I)
 - Galinsoga parviflora (I)
 - Galinsoga quadriradiata (I)
 - Galium aparine (N)
 - Galium asprellum (N)
 - Galium boreale (N)
 - Galium circaezans var. hypomalacum (N)
 - Galium concinnum (N)
 - Galium labradoricum (N)
 - Galium lanceolatum (N)
 - Galium mollugo (I)
 - Galium obtusum ssp. obtusum (N)
 - Galium odoratum (I)
 - Galium palustre (N)
 - Galium pilosum var. pilosum (N)
 - Galium tinctorium (N)
 - Galium trifidum ssp. trifidum (N)
 - Galium triflorum (N)
 - Galium verum var. verum (I)
 - Gamochaeta purpurea (N)
 - Gaultheria hispidula (N)
 - Gaultheria procumbens (N)
 - Gaura biennis (N)
 - Gaura longiflora (N)
 - Gaura mollis (N)
 - Gaylussacia baccata (N)
 - Genista tinctoria (I)
 - Gentiana alba (N)
 - Gentiana andrewsii var. andrewsii (N)
 - Gentiana × billingtonii (N)
 - Gentiana clausa (N)
 - Gentiana puberulenta (N)
 - Gentiana saponaria var. saponaria (N)
 - Gentiana villosa (N)
 - Gentianella quinquefolia ssp. occidentalis (N)
 - Gentianopsis crinita (N)
 - Gentianopsis virgata ssp. victorinii (N)
 - Gentianopsis virgata ssp. virgata (N)
 - Geranium bicknellii (N)
 - Geranium carolinianum var. carolinianum (N)
 - Geranium columbinum (I)
 - Geranium dissectum (I)
 - Geranium maculatum (N)
 - Geranium molle (I)
 - Geranium pusillum (I)
 - Geranium robertianum (I)
 - Geranium robertianum ssp. robertianum (N)
 - Geranium sanguineum (I)
 - Geum aleppicum (N)
 - Geum canadense var. canadense (N)
 - Geum laciniatum var. laciniatum (N)
 - Geum rivale (N)
 - Geum urbanum (I)
 - Geum vernum (N)
 - Geum virginianum (N)
 - Gilia capitata ssp. capitata (N)
 - Gillenia stipulata (N)
 - Gillenia trifoliata (N)
 - Gladiolus × gandavensis (I)
 - Glandularia canadensis (N)
 - Glandularia × hybrida (I)
 - Glebionis segetum (I)
 - Glechoma hederacea (I)
 - Gleditsia triacanthos (N)
 - Glyceria acutiflora (N)
 - Glyceria borealis (N)
 - Glyceria canadensis (N)
 - Glyceria grandis var. grandis (N)
 - Glyceria melicaria (N)
 - Glyceria septentrionalis (N)
 - Glyceria striata (N)
 - Glycine max (I)
 - Gnaphalium uliginosum (I)
 - Gomphrena globosa (I)
 - Goodyera pubescens (N)
 - Goodyera repens (N)
 - Goodyera tesselata (N)
 - Gratiola neglecta (N)
 - Gratiola virginiana var. virginiana (N)
 - Gratiola viscidula (N)
 - Grindelia lanceolata var. lanceolata (N)
 - Grindelia squarrosa var. serrulata (N)
 - Grindelia squarrosa var. squarrosa (N)
 - Guizotia abyssinica (I)
 - Gutierrezia texana var. texana (N)
 - Gymnocarpium appalachianum (N)
 - Gymnocarpium × brittonianum (N)
 - Gymnocarpium dryopteris (N)
 - Gymnocladus dioicus (N)
 - Gymnopogon ambiguus (N)
 - Gypsophila paniculata (I)
 - Gypsophila scorzonerifolia (I)
 
H
- Hackelia deflexa var. americana (N)
 - Hackelia virginiana (N)
 - Halesia tetraptera var. tetraptera (N)
 - Hamamelis virginiana (N)
 - Hasteola suaveolens (N)
 - Hedeoma hispida (N)
 - Hedeoma pulegioides (N)
 - Hedera helix (I)
 - Helenium amarum var. amarum (N)
 - Helenium autumnale var. autumnale (N)
 - Helenium flexuosum (N)
 - Helianthemum bicknellii (N)
 - Helianthemum canadense (N)
 - Helianthus × ambiguus (N)
 - Helianthus angustifolius (N)
 - Helianthus annuus (N)
 - Helianthus × brevifolius (N)
 - Helianthus × cinereus (N)
 - Helianthus decapetalus (N)
 - Helianthus divaricatus (N)
 - Helianthus × divariserratus (N)
 - Helianthus × doronicoides (N)
 - Helianthus giganteus (N)
 - Helianthus × glaucus (N)
 - Helianthus grosseserratus (N)
 - Helianthus hirsutus (N)
 - Helianthus × intermedius (N)
 - Helianthus × kellermanii (N)
 - Helianthus × laetiflorus (N)
 - Helianthus × luxurians (N)
 - Helianthus maximiliani (N)
 - Helianthus microcephalus (N)
 - Helianthus mollis (N)
 - Helianthus × multiflorus (N)
 - Helianthus occidentalis ssp. occidentalis (N)
 - Helianthus petiolaris ssp. petiolaris (N)
 - Helianthus salicifolius (N)
 - Helianthus strumosus (N)
 - Helianthus tuberosus (N)
 - Heliopsis helianthoides var. helianthoides (N)
 - Heliopsis helianthoides var. occidentalis (N)
 - Heliotropium europaeum (I)
 - Heliotropium indicum (I)
 - Helleborus viridis (I)
 - Hemerocallis fulva (I)
 - Hemerocallis lilioasphodelus (I)
 - Hepatica nobilis var. acuta (N)
 - Hepatica nobilis var. obtusa (N)
 - Heracleum maximum (N)
 - Hesperis matronalis (I)
 - Hesperostipa spartea (N)
 - Heteranthera dubia (N)
 - Heteranthera reniformis (N)
 - Heterotheca camporum var. camporum (N)
 - Heuchera americana var. americana (N)
 - Heuchera americana var. hirsuticaulis (N)
 - Heuchera americana var. hispida (N)
 - Heuchera longiflora (N)
 - Heuchera parviflora var. parviflora (N)
 - Heuchera villosa var. villosa (N)
 - Hexalectris spicata var. spicata (N)
 - Hibiscus laevis (N)
 - Hibiscus moscheutos (N)
 - Hibiscus syriacus (I)
 - Hibiscus trionum (I)
 - Hieracium aurantiacum (I)
 - Hieracium caespitosum (I)
 - Hieracium × flagellare var. flagellare (I)
 - Hieracium × floribundum (I)
 - Hieracium greenii (N)
 - Hieracium gronovii (N)
 - Hieracium kalmii var. fasciculatum (N)
 - Hieracium kalmii var. kalmii (N)
 - Hieracium longipilum (N)
 - Hieracium paniculatum (N)
 - Hieracium pilosella var. pilosella (I)
 - Hieracium piloselloides (I)
 - Hieracium scabrum var. scabrum (N)
 - Hieracium venosum (N)
 - Hierochloe hirta ssp. arctica (N)
 - Holcus lanatus (I)
 - Holosteum umbellatum (I)
 - Hordeum brachyantherum ssp. brachyantherum (N)
 - Hordeum jubatum ssp. jubatum (N)
 - Hordeum marinum ssp. gussonianum (I)
 - Hordeum pusillum (N)
 - Hordeum vulgare (I)
 - Hosta lancifolia (I)
 - Hosta ventricosa (I)
 - Hottonia inflata (N)
 - Houstonia caerulea (N)
 - Houstonia canadensis (N)
 - Houstonia longifolia (N)
 - Houstonia purpurea var. calycosa (N)
 - Houstonia purpurea var. purpurea (N)
 - Hudsonia tomentosa var. tomentosa (N)
 - Humulus japonicus (I)
 - Humulus lupulus var. lupuloides (N)
 - Humulus lupulus var. pubescens (N)
 - Humulus lupulus var. lupulus (I)
 - Huperzia × bartleyi (N)
 - Huperzia × buttersii (N)
 - Huperzia lucidula (N)
 - Huperzia porophila (N)
 - Hyacinthoides non-scripta (I)
 - Hybanthus concolor (N)
 - Hydrangea arborescens (N)
 - Hydrastis canadensis (N)
 - Hydrocotyle americana (N)
 - Hydrocotyle ranunculoides (N)
 - Hydrocotyle sibthorpioides (I)
 - Hydrocotyle umbellata (N)
 - Hydrophyllum appendiculatum (N)
 - Hydrophyllum canadense (N)
 - Hydrophyllum macrophyllum (N)
 - Hydrophyllum virginianum var. virginianum (N)
 - Hylotelephium telephioides (N)
 - Hylotelephium telephium ssp. telephium (I)
 - Hypericum ascyron (N)
 - Hypericum boreale (N)
 - Hypericum canadense (N)
 - Hypericum drummondii (N)
 - Hypericum ellipticum (N)
 - Hypericum gentianoides (N)
 - Hypericum gymnanthum (N)
 - Hypericum hypericoides ssp. multicaule (N)
 - Hypericum kalmianum (N)
 - Hypericum majus (N)
 - Hypericum mutilum (N)
 - Hypericum perforatum (I)
 - Hypericum prolificum (N)
 - Hypericum punctatum (N)
 - Hypericum sphaerocarpum (N)
 - Hypericum virgatum (N)
 - Hypochaeris glabra (I)
 - Hypochaeris radicata (I)
 - Hypoxis hirsuta (N)
 
I
- Iberis umbellata (I)
 - Ilex crenata (I)
 - Ilex mucronata (N)
 - Ilex opaca var. opaca (N)
 - Ilex verticillata (N)
 - Impatiens balsamina (I)
 - Impatiens capensis (N)
 - Impatiens pallida (N)
 - Inula helenium (I)
 - Iodanthus pinnatifidus (N)
 - Ionactis linariifolius (N)
 - Ipomoea coccinea (I)
 - Ipomoea hederacea (I)
 - Ipomoea lacunosa (N)
 - Ipomoea pandurata (N)
 - Ipomoea purpurea (I)
 - Ipomopsis rubra (N)
 - Iris brevicaulis (N)
 - Iris cristata (N)
 - Iris fulva (N)
 - Iris germanica (I)
 - Iris pseudacorus (I)
 - Iris verna var. smalliana (N)
 - Iris versicolor (N)
 - Iris virginica var. shrevei (N)
 - Isoetes appalachiana (N)
 - Isoetes engelmannii (N)
 - Isoetes tenella (N)
 - Isotria medeoloides (N)
 - Isotria verticillata (N)
 - Iva annua var. annua (N)
 
J
- Jacquemontia tamnifolia (N)
 - Jeffersonia diphylla (N)
 - Juglans cinerea (N)
 - Juglans nigra (N)
 - Juncus acuminatus (N)
 - Juncus alpinoarticulatus ssp. nodulosus (N)
 - Juncus anthelatus (N)
 - Juncus arcticus ssp. littoralis (N)
 - Juncus articulatus (N)
 - Juncus biflorus (N)
 - Juncus brachycarpus (N)
 - Juncus brachycephalus (N)
 - Juncus bufonius var. bufonius (N)
 - Juncus canadensis (N)
 - Juncus compressus (I)
 - Juncus dichotomus (N)
 - Juncus diffusissimus (N)
 - Juncus dudleyi (N)
 - Juncus effusus var. decipiens (N)
 - Juncus effusus var. pylaei (N)
 - Juncus effusus var. solutus (N)
 - Juncus gerardii var. gerardii (N)
 - Juncus greenei (N)
 - Juncus interior var. interior (N)
 - Juncus marginatus (N)
 - Juncus nodosus var. nodosus (N)
 - Juncus secundus (N)
 - Juncus × stuckeyi (N)
 - Juncus subcaudatus var. subcaudatus (N)
 - Juncus tenuis (N)
 - Juncus torreyi (N)
 - Juniperus communis var. depressa (N)
 - Juniperus virginiana var. virginiana (N)
 - Justicia americana (N)
 
K
- Kalmia latifolia (N)
 - Kerria japonica (I)
 - Kickxia elatine (I)
 - Kickxia spuria (I)
 - Koeleria macrantha (N)
 - Koelreuteria paniculata (I)
 - Krigia biflora var. biflora (N)
 - Krigia dandelion (N)
 - Krigia virginica (N)
 - Kummerowia stipulacea (I)
 - Kummerowia striata (I)
 - Kyllinga pumila (N)
 
L
- Lablab purpureus (I)
 - Lactuca biennis (N)
 - Lactuca canadensis (N)
 - Lactuca floridana var. floridana (N)
 - Lactuca floridana var. villosa (N)
 - Lactuca hirsuta var. sanguinea (N)
 - Lactuca × morssii (N)
 - Lactuca saligna (I)
 - Lactuca sativa (I)
 - Lactuca serriola (I)
 - Lactuca tatarica var. pulchella (N)
 - Lamium album (I)
 - Lamium amplexicaule (I)
 - Lamium maculatum (I)
 - Lamium purpureum var. purpureum (I)
 - Laportea canadensis (N)
 - Lappula squarrosa (I)
 - Lapsana communis (I)
 - Larix laricina (N)
 - Lathyrus japonicus var. maritimus (N)
 - Lathyrus japonicus var. parviflorus (N)
 - Lathyrus latifolius (I)
 - Lathyrus ochroleucus (N)
 - Lathyrus odoratus (I)
 - Lathyrus palustris (N)
 - Lathyrus pratensis (I)
 - Lathyrus tuberosus (I)
 - Lathyrus venosus (N)
 - Leavenworthia uniflora (N)
 - Lechea intermedia var. intermedia (N)
 - Lechea minor (N)
 - Lechea mucronata (N)
 - Lechea pulchella var. moniliformis (N)
 - Lechea pulchella var. pulchella (N)
 - Lechea racemulosa (N)
 - Lechea tenuifolia (N)
 - Ledum groenlandicum (N)
 - Leersia lenticularis (N)
 - Leersia oryzoides (N)
 - Leersia virginica (N)
 - Lemna minor (N)
 - Lemna minuta (N)
 - Lemna obscura (N)
 - Lemna perpusilla (N)
 - Lemna trisulca (N)
 - Lemna turionifera (N)
 - Lemna valdiviana (N)
 - Leontodon autumnalis ssp. autumnalis (I)
 - Leontodon autumnalis ssp. pratensis (I)
 - Leontodon hispidus ssp. danubialis (I)
 - Leontodon taraxacoides ssp. taraxacoides (I)
 - Leonurus cardiaca ssp. cardiaca (I)
 - Leonurus sibiricus (I)
 - Lepidium campestre (I)
 - Lepidium densiflorum var. densiflorum (N)
 - Lepidium perfoliatum (I)
 - Lepidium ramosissimum var. bourgeauanum (N)
 - Lepidium ruderale (I)
 - Lepidium sativum (I)
 - Lepidium virginicum var. virginicum (N)
 - Leptochloa fusca ssp. fascicularis (N)
 - Leptochloa panicea ssp. brachiata (N)
 - Lespedeza × acuticarpa (N)
 - Lespedeza bicolor (I)
 - Lespedeza × brittonii (N)
 - Lespedeza capitata (N)
 - Lespedeza cuneata (I)
 - Lespedeza formosa (I)
 - Lespedeza frutescens (N)
 - Lespedeza hirta ssp. hirta (N)
 - Lespedeza × nuttallii (N)
 - Lespedeza procumbens (N)
 - Lespedeza repens (N)
 - Lespedeza thunbergii (I)
 - Lespedeza violacea (N)
 - Lespedeza virginica (N)
 - Lesquerella globosa (N)
 - Leucanthemum maximum (I)
 - Leucanthemum vulgare (I)
 - Leucojum aestivum ssp. aestivum (I)
 - Leucospora multifida (N)
 - Levisticum officinale (I)
 - Liatris aspera var. aspera (N)
 - Liatris aspera var. intermedia (N)
 - Liatris cylindracea (N)
 - Liatris punctata var. punctata (N)
 - Liatris pycnostachya var. pycnostachya (N)
 - Liatris scariosa var. nieuwlandii (N)
 - Liatris spheroidea (N)
 - Liatris spicata var. spicata (N)
 - Liatris squarrosa var. squarrosa (N)
 - Liatris squarrulosa (N)
 - Ligusticum canadense (N)
 - Ligustrum obtusifolium (I)
 - Ligustrum ovalifolium (I)
 - Ligustrum vulgare (I)
 - Lilium canadense ssp. canadense (N)
 - Lilium canadense ssp. editorum (N)
 - Lilium lancifolium (I)
 - Lilium michiganense (N)
 - Lilium philadelphicum var. andinum (N)
 - Lilium philadelphicum var. philadelphicum (N)
 - Lilium superbum (N)
 - Linaria dalmatica ssp. dalmatica (I)
 - Linaria genistifolia (I)
 - Linaria vulgaris (I)
 - Lindera benzoin var. benzoin (N)
 - Lindera benzoin var. pubescens (N)
 - Lindernia dubia var. anagallidea (N)
 - Lindernia dubia var. dubia (N)
 - Linnaea borealis ssp. americana (N)
 - Linum grandiflorum (I)
 - Linum medium var. texanum (N)
 - Linum perenne (I)
 - Linum perenne (N)
 - Linum striatum (N)
 - Linum sulcatum var. sulcatum (N)
 - Linum usitatissimum (I)
 - Linum virginianum (N)
 - Liparis liliifolia (N)
 - Liparis loeselii (N)
 - Lipocarpha drummondii (N)
 - Lipocarpha micrantha (N)
 - Liquidambar styraciflua (N)
 - Liriodendron tulipifera (N)
 - Lithospermum canescens (N)
 - Lithospermum caroliniense var. croceum (N)
 - Lithospermum latifolium (N)
 - Lithospermum officinale (I)
 - Lobelia cardinalis (N)
 - Lobelia inflata (N)
 - Lobelia kalmii (N)
 - Lobelia puberula var. simulans (N)
 - Lobelia siphilitica var. siphilitica (N)
 - Lobelia spicata var. campanulata (N)
 - Lobelia spicata var. leptostachys (N)
 - Lobelia spicata var. spicata (N)
 - Lobularia maritima (I)
 - Lorinseria areolata (N)
 - Lolium perenne ssp. multiflorum (I)
 - Lolium perenne ssp. perenne (I)
 - Lolium temulentum ssp. temulentum (I)
 - Lonicera × bella (I)
 - Lonicera canadensis (N)
 - Lonicera dioica (N)
 - Lonicera flava (N)
 - Lonicera fragrantissima (I)
 - Lonicera japonica (I)
 - Lonicera × minutiflora (I)
 - Lonicera morrowii (I)
 - Lonicera maackii (I)
 - Lonicera oblongifolia (N)
 - Lonicera reticulata (N)
 - Lonicera ruprechtiana (I)
 - Lonicera × salicifolia (I)
 - Lonicera sempervirens (N)
 - Lonicera tatarica (I)
 - Lonicera villosa var. tonsa (N)
 - Lonicera × xylosteoides (I)
 - Lonicera xylosteum (I)
 - Lotus corniculatus var. corniculatus (I)
 - Lotus glaber (I)
 - Ludwigia alternifolia (N)
 - Ludwigia decurrens (N)
 - Ludwigia leptocarpa (N)
 - Ludwigia palustris (N)
 - Ludwigia peploides (I)
 - Ludwigia peploides ssp. glabrescens (N)
 - Ludwigia polycarpa (N)
 - Lunaria annua (I)
 - Lupinus perennis ssp. perennis var. occidentalis (N)
 - Lupinus perennis ssp. perennis var. perennis (N)
 - Lupinus perennis ssp. perennis (N)
 - Luzula acuminata ssp. acuminata (N)
 - Luzula acuminata ssp. carolinae (N)
 - Luzula bulbosa (N)
 - Luzula echinata (N)
 - Luzula multiflora ssp. multiflora var. multiflora (N)
 - Luzula multiflora ssp. multiflora (N)
 - Lychnis coronaria (I)
 - Lychnis flos-cuculi (I)
 - Lychnis viscaria (I)
 - Lycium barbarum (I)
 - Lycium chinense (I)
 - Lycopodiella inundata (N)
 - Lycopodiella margueritiae (N)
 - Lycopodiella subappressa (N)
 - Lycopodium clavatum (N)
 - Lycopodium dendroideum (N)
 - Lycopodium digitatum (N)
 - Lycopodium × habereri (N)
 - Lycopodium hickeyi (N)
 - Lycopodium lagopus (N)
 - Lycopodium obscurum (N)
 - Lycopodium tristachyum (N)
 - Lycopus americanus (N)
 - Lycopus asper (N)
 - Lycopus europaeus (I)
 - Lycopus rubellus (N)
 - Lycopus × sherardii (N)
 - Lycopus uniflorus var. uniflorus (N)
 - Lycopus virginicus (N)
 - Lycoris squamigera (I)
 - Lygodium palmatum (N)
 - Lyonia ligustrina var. ligustrina (N)
 - Lysimachia ciliata (N)
 - Lysimachia lanceolata (N)
 - Lysimachia nummularia (I)
 - Lysimachia × producta (N)
 - Lysimachia punctata (I)
 - Lysimachia quadriflora (N)
 - Lysimachia quadrifolia (N)
 - Lysimachia terrestris (N)
 - Lysimachia thyrsiflora (N)
 - Lysimachia vulgaris (I)
 - Lythrum alatum var. alatum (N)
 - Lythrum hyssopifolia (I)
 - Lythrum portula (I)
 - Lythrum salicaria (I)
 
M
- Macleaya cordata (I)
 - Maclura pomifera (N)
 - Magnolia acuminata (N)
 - Magnolia fraseri (N)
 - Magnolia macrophylla (N)
 - Magnolia × soulangeana (I)
 - Magnolia stellata (I)
 - Magnolia tripetala (N)
 - Mahonia aquifolium (N)
 - Maianthemum canadense (N)
 - Maianthemum racemosum ssp. racemosum (N)
 - Maianthemum stellatum (N)
 - Maianthemum trifolium (N)
 - Malaxis unifolia (N)
 - Malus angustifolia var. angustifolia (N)
 - Malus baccata (I)
 - Malus coronaria (N)
 - Malus floribunda (I)
 - Malus ioensis var. ioensis (N)
 - Malus × platycarpa (N)
 - Malus pumila (I)
 - Malus toringo (I)
 - Malus zumi (I)
 - Malva alcea (I)
 - Malva moschata (I)
 - Malva neglecta (I)
 - Malva pusilla (I)
 - Malva sylvestris (I)
 - Malva verticillata (I)
 - Manfreda virginica (N)
 - Marrubium vulgare (I)
 - Marsilea quadrifolia (I)
 - Marsilea quadrifolia (N)
 - Matelea obliqua (N)
 - Matricaria discoidea (I)
 - Matricaria recutita (I)
 - Matteuccia struthiopteris (N)
 - Mazus pumilus (I)
 - Medeola virginiana (N)
 - Medicago lupulina (I)
 - Medicago polymorpha (I)
 - Medicago sativa ssp. falcata (I)
 - Medicago sativa ssp. sativa (I)
 - Meehania cordata (N)
 - Melampyrum lineare var. latifolium (N)
 - Melampyrum lineare var. lineare (N)
 - Melica nitens (N)
 - Melilotus altissimus (I)
 - Melilotus officinalis (I)
 - Melissa officinalis (I)
 - Menispermum canadense (N)
 - Mentha aquatica (I)
 - Mentha arvensis (N)
 - Mentha × gracilis (I)
 - Mentha × piperita (N)
 - Mentha × rotundifolia (I)
 - Mentha spicata (I)
 - Mentha suaveolens (I)
 - Mentha × villosa (I)
 - Menyanthes trifoliata (N)
 - Mercurialis annua (I)
 - Mertensia virginica (N)
 - Microstegium vimineum (I)
 - Microthlaspi perfoliatum (I)
 - Mikania scandens (N)
 - Milium effusum var. cisatlanticum (N)
 - Mimulus alatus (N)
 - Mimulus ringens var. ringens (N)
 - Minuartia michauxii var. michauxii (N)
 - Minuartia patula (N)
 - Mirabilis albida (N)
 - Mirabilis hirsuta (N)
 - Mirabilis jalapa (I)
 - Mirabilis nyctaginea (N)
 - Miscanthus sinensis (I)
 - Misopates orontium (I)
 - Mitchella repens (N)
 - Mitella diphylla (N)
 - Moehringia lateriflora (N)
 - Moehringia trinervia (I)
 - Mollugo verticillata (N)
 - Monarda clinopodia (N)
 - Monarda didyma (N)
 - Monarda fistulosa ssp. fistulosa var. fistulosa (N)
 - Monarda fistulosa ssp. fistulosa var. mollis (N)
 - Monarda fistulosa ssp. fistulosa (N)
 - Monarda media (N)
 - Monarda punctata ssp. punctata var. villicaulis (N)
 - Monarda punctata ssp. punctata (N)
 - Moneses uniflora (N)
 - Monolepis nuttalliana (N)
 - Monotropa hypopithys (N)
 - Monotropa uniflora (N)
 - Morella pensylvanica (N)
 - Morus alba (I)
 - Morus nigra (I)
 - Morus rubra var. rubra (N)
 - Muhlenbergia asperifolia (N)
 - Muhlenbergia capillaris (N)
 - Muhlenbergia × curtisetosa (N)
 - Muhlenbergia cuspidata (N)
 - Muhlenbergia frondosa (N)
 - Muhlenbergia glomerata (N)
 - Muhlenbergia mexicana (N)
 - Muhlenbergia schreberi (N)
 - Muhlenbergia sobolifera (N)
 - Muhlenbergia sylvatica (N)
 - Muhlenbergia tenuiflora (N)
 - Muscari armeniacum (I)
 - Muscari botryoides (I)
 - Muscari comosum (I)
 - Muscari neglectum (I)
 - Myagrum perfoliatum (I)
 - Myosotis arvensis (I)
 - Myosotis discolor (I)
 - Myosotis laxa (N)
 - Myosotis macrosperma (N)
 - Myosotis scorpioides (I)
 - Myosotis stricta (I)
 - Myosotis sylvatica (I)
 - Myosotis verna (N)
 - Myosoton aquaticum (I)
 - Myosurus minimus (N)
 - Myriophyllum aquaticum (I)
 - Myriophyllum heterophyllum (N)
 - Myriophyllum humile (N)
 - Myriophyllum pinnatum (N)
 - Myriophyllum sibiricum (N)
 - Myriophyllum spicatum (I)
 - Myriophyllum verticillatum (N)
 
N
- Najas flexilis (N)
 - Najas gracillima (N)
 - Najas guadalupensis ssp. guadalupensis (N)
 - Najas marina (N)
 - Najas minor (I)
 - Napaea dioica (N)
 - Narcissus × incomparabilis (I)
 - Narcissus jonquilla (I)
 - Narcissus × medioluteus (I)
 - Narcissus poeticus (I)
 - Narcissus pseudonarcissus (I)
 - Nasturtium officinale (I)
 - Navarretia intertexta ssp. propinqua (N)
 - Nelumbo lutea (N)
 - Nelumbo nucifera (I)
 - Neobeckia aquatica (N)
 - Neottia cordata var. cordata (N)
 - Nepeta cataria (I)
 - Neslia paniculata (I)
 - Nicandra physalodes (I)
 - Nicotiana alata (I)
 - Nicotiana glauca (I)
 - Nicotiana rustica (I)
 - Nicotiana tabacum (I)
 - Nigella damascena (I)
 - Nothoscordum bivalve (N)
 - Nuphar lutea ssp. advena (N)
 - Nuphar lutea ssp. variegata (N)
 - Nuttallanthus canadensis (N)
 - Nymphaea odorata ssp. odorata (N)
 - Nymphaea odorata ssp. tuberosa (N)
 - Nymphoides peltata (I)
 - Nyssa sylvatica (N)
 
O
- Obolaria virginica (N)
 - Oclemena acuminata (N)
 - Oenanthe aquatica (I)
 - Oenothera biennis (N)
 - Oenothera clelandii (N)
 - Oenothera fruticosa ssp. fruticosa (N)
 - Oenothera fruticosa ssp. glauca (N)
 - Oenothera laciniata (N)
 - Oenothera nutans (N)
 - Oenothera oakesiana (N)
 - Oenothera parviflora (N)
 - Oenothera perennis (N)
 - Oenothera pilosella ssp. pilosella (N)
 - Oenothera speciosa (N)
 - Oenothera triloba (N)
 - Oenothera villosa ssp. villosa (N)
 - Oligoneuron album (N)
 - Oligoneuron ohioense (N)
 - Oligoneuron riddellii (N)
 - Oligoneuron rigidum var. glabratum (N)
 - Oligoneuron rigidum var. rigidum (N)
 - Onoclea sensibilis (N)
 - Onopordum acanthium (I)
 - Onosmodium bejariense var. hispidissimum (N)
 - Ophioglossum engelmannii (N)
 - Ophioglossum pusillum (N)
 - Ophioglossum vulgatum (N)
 - Opuntia humifusa (N)
 - Opuntia macrorhiza var. macrorhiza (N)
 - Orbexilum onobrychis (N)
 - Orbexilum pedunculatum var. pedunculatum (N)
 - Origanum vulgare (I)
 - Ornithogalum nutans (I)
 - Ornithogalum umbellatum (I)
 - Orobanche ludoviciana ssp. ludoviciana (N)
 - Orobanche uniflora (N)
 - Orthilia secunda (N)
 - Oryzopsis asperifolia (N)
 - Osmorhiza claytonii (N)
 - Osmorhiza longistylis (N)
 - Osmunda cinnamomea var. cinnamomea (N)
 - Osmunda claytoniana (N)
 - Osmunda regalis var. spectabilis (N)
 - Ostrya virginiana var. virginiana (N)
 - Oxalis corniculata (N)
 - Oxalis dillenii (N)
 - Oxalis grandis (N)
 - Oxalis montana (N)
 - Oxalis stricta (N)
 - Oxalis violacea (N)
 - Oxydendrum arboreum (N)
 - Oxypolis rigidior (N)
 
P
- Pachysandra terminalis (I)
 - Packera anonyma (N)
 - Packera aurea (N)
 - Packera glabella (N)
 - Packera obovata (N)
 - Packera paupercula (N)
 - Packera plattensis (N)
 - Panax quinquefolius (N)
 - Panax trifolius (N)
 - Panicum anceps (N)
 - Panicum capillare (N)
 - Panicum dichotomiflorum var. dichotomiflorum (N)
 - Panicum flexile (N)
 - Panicum gattingeri (N)
 - Panicum miliaceum ssp. miliaceum (I)
 - Panicum philadelphicum (N)
 - Panicum rigidulum var. elongatum (N)
 - Panicum rigidulum var. pubescens (N)
 - Panicum rigidulum var. rigidulum (N)
 - Panicum verrucosum (N)
 - Panicum virgatum var. virgatum (N)
 - Papaver argemone (I)
 - Papaver dubium (I)
 - Papaver rhoeas (I)
 - Papaver somniferum (I)
 - Parietaria pensylvanica (N)
 - Parnassia glauca (N)
 - Paronychia canadensis (N)
 - Paronychia fastigiata var. fastigiata (N)
 - Parthenium hysterophorus (I)
 - Parthenium integrifolium var. integrifolium (N)
 - Parthenocissus quinquefolia (N)
 - Parthenocissus tricuspidata (I)
 - Parthenocissus vitacea (N)
 - Pascopyrum smithii (N)
 - Paspalum floridanum (N)
 - Paspalum fluitans (N)
 - Paspalum laeve (N)
 - Paspalum pubiflorum (N)
 - Paspalum setaceum (N)
 - Passiflora incarnata (N)
 - Passiflora lutea (N)
 - Pastinaca sativa (I)
 - Paulownia tomentosa (I)
 - Paxistima canbyi (N)
 - Pedicularis canadensis ssp. canadensis (N)
 - Pedicularis lanceolata (N)
 - Pellaea atropurpurea (N)
 - Pellaea glabella ssp. glabella (N)
 - Peltandra virginica (N)
 - Pennisetum glaucum (I)
 - Penstemon alluviorum (N)
 - Penstemon calycosus (N)
 - Penstemon canescens (N)
 - Penstemon cobaea (N)
 - Penstemon digitalis (N)
 - Penstemon grandiflorus (N)
 - Penstemon hirsutus (N)
 - Penstemon laevigatus (N)
 - Penstemon pallidus (N)
 - Penstemon tubiflorus var. tubiflorus (N)
 - Penthorum sedoides (N)
 - Perideridia americana (N)
 - Perilla frutescens var. frutescens (I)
 - Petasites hybridus (I)
 - Petrorhagia prolifera (I)
 - Petrorhagia saxifraga (I)
 - Petroselinum crispum (I)
 - Petunia × atkinsiana (I)
 - Petunia axillaris (I)
 - Phacelia bipinnatifida (N)
 - Phacelia dubia var. dubia (N)
 - Phacelia purshii (N)
 - Phacelia ranunculacea (N)
 - Phalaris arundinacea (N)
 - Phalaris canariensis (I)
 - Phalaris caroliniana (N)
 - Phaseolus coccineus (I)
 - Phaseolus polystachios var. polystachios (N)
 - Phaseolus vulgaris (I)
 - Phegopteris connectilis (N)
 - Phegopteris hexagonoptera (N)
 - Phellodendron amurense (I)
 - Philadelphus coronarius (I)
 - Philadelphus inodorus (N)
 - Philadelphus pubescens var. pubescens (N)
 - Philadelphus tomentosus (I)
 - Phleum pratense (I)
 - Phlox divaricata ssp. divaricata (N)
 - Phlox glaberrima ssp. triflora (N)
 - Phlox latifolia (N)
 - Phlox maculata ssp. maculata (N)
 - Phlox maculata ssp. pyramidalis (N)
 - Phlox paniculata (N)
 - Phlox pilosa ssp. pilosa (N)
 - Phlox stolonifera (N)
 - Phlox subulata ssp. brittonii (N)
 - Phlox subulata ssp. subulata (N)
 - Phoradendron leucarpum (N)
 - Photinia floribunda (N)
 - Photinia melanocarpa (N)
 - Phragmites australis (N)
 - Phryma leptostachya (N)
 - Phyla lanceolata (N)
 - Phyllanthus caroliniensis ssp. caroliniensis (N)
 - Physalis alkekengi (I)
 - Physalis grisea (N)
 - Physalis heterophylla var. heterophylla (N)
 - Physalis hispida (N)
 - Physalis longifolia var. longifolia (N)
 - Physalis longifolia var. subglabrata (N)
 - Physalis philadelphica var. immaculata (I)
 - Physalis pubescens var. integrifolia (N)
 - Physalis pubescens var. pubescens (N)
 - Physalis virginiana var. virginiana (N)
 - Physematium obtusum ssp. obtusa (N)
 - Physocarpus opulifolius var. intermedius (N)
 - Physocarpus opulifolius var. opulifolius (N)
 - Physostegia virginiana ssp. praemorsa (N)
 - Physostegia virginiana ssp. virginiana (N)
 - Phytolacca americana var. americana (N)
 - Picea abies (I)
 - Picris echioides (I)
 - Picris hieracioides (N)
 - Picris hieracioides ssp. hieracioides (I)
 - Pilea fontana (N)
 - Pilea pumila var. pumila (N)
 - Pimpinella saxifraga ssp. saxifraga (I)
 - Pinellia ternata (I)
 - Pinus banksiana (N)
 - Pinus echinata (N)
 - Pinus nigra (I)
 - Pinus rigida (N)
 - Pinus strobus (N)
 - Pinus sylvestris (I)
 - Pinus virginiana (N)
 - Piptatherum racemosum (N)
 - Piptochaetium avenaceum (N)
 - Pistia stratiotes (N)
 - Pityopsis graminifolia var. latifolia (N)
 - Plantago aristata (N)
 - Plantago cordata (N)
 - Plantago lanceolata (I)
 - Plantago major (I)
 - Plantago patagonica (N)
 - Plantago psyllium (I)
 - Plantago rugelii var. rugelii (N)
 - Plantago virginica (N)
 - Platanthera × andrewsii (N)
 - Platanthera aquilonis (N)
 - Platanthera blephariglottis var. blephariglottis (N)
 - Platanthera ciliaris (N)
 - Platanthera clavellata (N)
 - Platanthera flava var. herbiola (N)
 - Platanthera grandiflora (N)
 - Platanthera hookeri (N)
 - Platanthera lacera (N)
 - Platanthera leucophaea (N)
 - Platanthera orbiculata (N)
 - Platanthera peramoena (N)
 - Platanthera psycodes (N)
 - Platanus occidentalis (N)
 - Pleopeltis polypodioides ssp. michauxiana (N)
 - Pluchea camphorata (N)
 - Poa alsodes (N)
 - Poa annua (I)
 - Poa arida (N)
 - Poa bulbosa (I)
 - Poa chapmaniana (N)
 - Poa compressa (I)
 - Poa cuspidata (N)
 - Poa nemoralis (N)
 - Poa nemoralis ssp. nemoralis (I)
 - Poa paludigena (N)
 - Poa palustris (N)
 - Poa pratensis (I)
 - Poa pratensis ssp. pratensis (N)
 - Poa saltuensis (N)
 - Poa sylvestris (N)
 - Poa trivialis (I)
 - Poa wolfii (N)
 - Podophyllum peltatum (N)
 - Podostemum ceratophyllum (N)
 - Pogonia ophioglossoides (N)
 - Polanisia dodecandra ssp. dodecandra (N)
 - Polanisia dodecandra ssp. trachysperma (N)
 - Polanisia jamesii (N)
 - Polemonium caeruleum (I)
 - Polemonium reptans var. reptans (N)
 - Polemonium reptans var. villosum (N)
 - Polygala ambigua (N)
 - Polygala cruciata var. aquilonia (N)
 - Polygala curtissii (N)
 - Polygala incarnata (N)
 - Polygala paucifolia (N)
 - Polygala polygama (N)
 - Polygala sanguinea (N)
 - Polygala senega (N)
 - Polygala verticillata var. isocycla (N)
 - Polygala verticillata var. verticillata (N)
 - Polygonatum biflorum var. commutatum (N)
 - Polygonatum pubescens (N)
 - Polygonum achoreum (N)
 - Polygonum amphibium var. emersum (N)
 - Polygonum amphibium var. stipulaceum (N)
 - Polygonum arenastrum (I)
 - Polygonum arifolium (N)
 - Polygonum aviculare (I)
 - Polygonum buxiforme (N)
 - Polygonum careyi (N)
 - Polygonum cespitosum var. longisetum (I)
 - Polygonum ciliinode (N)
 - Polygonum convolvulus var. convolvulus (I)
 - Polygonum erectum (N)
 - Polygonum fowleri ssp. fowleri (N)
 - Polygonum hydropiper (I)
 - Polygonum hydropiperoides (N)
 - Polygonum lapathifolium (N)
 - Polygonum orientale (I)
 - Polygonum pensylvanicum (N)
 - Polygonum perfoliatum (I)
 - Polygonum persicaria (I)
 - Polygonum punctatum var. confertiflorum (N)
 - Polygonum punctatum var. punctatum (N)
 - Polygonum ramosissimum var. ramosissimum (N)
 - Polygonum robustius (N)
 - Polygonum sachalinense (I)
 - Polygonum sagittatum (N)
 - Polygonum scandens var. cristatum (N)
 - Polygonum scandens var. dumetorum (N)
 - Polygonum scandens var. scandens (N)
 - Polygonum scandens var. dumetorum (I)
 - Polygonum setaceum (N)
 - Polygonum tenue (N)
 - Polygonum virginianum (N)
 - Polymnia canadensis (N)
 - Polypodium appalachianum (N)
 - Polypodium virginianum (N)
 - Polystichum acrostichoides var. acrostichoides (N)
 - Pontederia cordata (N)
 - Populus alba (I)
 - Populus balsamifera ssp. balsamifera (N)
 - Populus × canadensis (N)
 - Populus × canescens (I)
 - Populus deltoides ssp. deltoides (N)
 - Populus deltoides ssp. monilifera (N)
 - Populus grandidentata (N)
 - Populus heterophylla (N)
 - Populus × jackii (N)
 - Populus nigra (I)
 - Populus × smithii (N)
 - Populus tremuloides (N)
 - Portulaca grandiflora (I)
 - Portulaca oleracea (I)
 - Portulaca oleracea (N)
 - Potamogeton amplifolius (N)
 - Potamogeton compressus (N)
 - Potamogeton crispus (I)
 - Potamogeton diversifolius (N)
 - Potamogeton epihydrus (N)
 - Potamogeton foliosus ssp. foliosus (N)
 - Potamogeton friesii (N)
 - Potamogeton gramineus (N)
 - Potamogeton × hagstroemii (N)
 - Potamogeton hillii (N)
 - Potamogeton illinoensis (N)
 - Potamogeton natans (N)
 - Potamogeton nodosus (N)
 - Potamogeton perfoliatus (N)
 - Potamogeton praelongus (N)
 - Potamogeton pulcher (N)
 - Potamogeton pusillus ssp. pusillus (N)
 - Potamogeton pusillus ssp. tenuissimus (N)
 - Potamogeton × rectifolius (N)
 - Potamogeton richardsonii (N)
 - Potamogeton robbinsii (N)
 - Potamogeton spirillus (N)
 - Potamogeton strictifolius (N)
 - Potamogeton tennesseensis (N)
 - Potamogeton vaseyi (N)
 - Potentilla argentea var. argentea (I)
 - Potentilla arguta ssp. arguta (N)
 - Potentilla canadensis var. canadensis (N)
 - Potentilla canadensis var. villosissima (N)
 - Potentilla inclinata (I)
 - Potentilla intermedia (I)
 - Potentilla norvegica ssp. monspeliensis (N)
 - Potentilla paradoxa (N)
 - Potentilla pensylvanica var. pensylvanica (N)
 - Potentilla recta (I)
 - Potentilla reptans (I)
 - Potentilla simplex (N)
 - Prenanthes alba (N)
 - Prenanthes altissima (N)
 - Prenanthes aspera (N)
 - Prenanthes crepidinea (N)
 - Prenanthes racemosa var. racemosa (N)
 - Prenanthes serpentaria (N)
 - Prenanthes trifoliolata (N)
 - Proboscidea louisianica ssp. louisianica (N)
 - Prosartes lanuginosa (N)
 - Prosartes maculata (N)
 - Proserpinaca palustris var. amblyogona (N)
 - Proserpinaca palustris var. crebra (N)
 - Prunella laciniata (I)
 - Prunella vulgaris ssp. lanceolata (N)
 - Prunus americana (N)
 - Prunus avium (I)
 - Prunus cerasifera (I)
 - Prunus cerasus (I)
 - Prunus domestica var. domestica (I)
 - Prunus hortulana (N)
 - Prunus mahaleb (I)
 - Prunus mexicana (N)
 - Prunus munsoniana (N)
 - Prunus nigra (N)
 - Prunus pensylvanica var. pensylvanica (N)
 - Prunus persica var. persica (I)
 - Prunus pumila var. pumila (N)
 - Prunus serotina var. serotina (N)
 - Prunus subhirtella (I)
 - Prunus susquehanae (N) (here considered a synonym of P. pumila)
 - Prunus tomentosa (I)
 - Prunus virginiana var. virginiana (N)
 - Psammophiliella muralis (syn. Gypsophila muralis) (I)
 - Pseudognaphalium macounii (N)
 - Pseudognaphalium obtusifolium ssp. obtusifolium (N)
 - Pseudolysimachion longifolium (I)
 - Ptelea trifoliata ssp. trifoliata var. trifoliata (N)
 - Ptelea trifoliata ssp. trifoliata (N)
 - Pteridium aquilinum var. latiusculum (N)
 - Pteridium aquilinum var. pseudocaudatum (N)
 - Puccinellia distans (N)
 - Puccinellia distans ssp. distans (I)
 - Pueraria montana var. lobata (I)
 - Pycnanthemum incanum var. incanum (N)
 - Pycnanthemum incanum var. puberulum (N)
 - Pycnanthemum muticum (N)
 - Pycnanthemum pycnanthemoides var. pycnanthemoides (N)
 - Pycnanthemum tenuifolium (N)
 - Pycnanthemum verticillatum var. pilosum (N)
 - Pycnanthemum verticillatum var. verticillatum (N)
 - Pycnanthemum virginianum (N)
 - Pyracantha coccinea (I)
 - Pyracantha coccinea (N)
 - Pyrola americana (N)
 - Pyrola asarifolia ssp. asarifolia (N)
 - Pyrola chlorantha (N)
 - Pyrola elliptica (N)
 - Pyrus calleryana (I)
 - Pyrus communis (I)
 
Q
- Quercus alba (N)
 - Quercus × bebbiana (N)
 - Quercus bicolor (N)
 - Quercus × bushii (N)
 - Quercus coccinea var. coccinea (N)
 - Quercus coccinea var. tuberculata (N)
 - Quercus × deamii (N)
 - Quercus ellipsoidalis (N)
 - Quercus × exacta (N)
 - Quercus falcata (N)
 - Quercus × fontana (N)
 - Quercus × hawkinsiae (N)
 - Quercus imbricaria (N)
 - Quercus × jackiana (N)
 - Quercus × leana (N)
 - Quercus macrocarpa var. macrocarpa (N)
 - Quercus marilandica var. marilandica (N)
 - Quercus muehlenbergii (N)
 - Quercus × mutabilis (N)
 - Quercus × palaeolithicola (N)
 - Quercus palustris (N)
 - Quercus prinus (N)
 - Quercus robur (I)
 - Quercus rubra var. ambigua (N)
 - Quercus rubra var. rubra (N)
 - Quercus × runcinata (N)
 - Quercus × saulii (N)
 - Quercus × schuettei (N)
 - Quercus shumardii var. schneckii (N)
 - Quercus shumardii var. shumardii (N)
 - Quercus stellata (N)
 - Quercus × tridentata (N)
 - Quercus velutina (N)
 
R
- Ranunculus abortivus (N)
 - Ranunculus acris var. acris (N)
 - Ranunculus acris var. acris (I)
 - Ranunculus allegheniensis (N)
 - Ranunculus ambigens (N)
 - Ranunculus arvensis (I)
 - Ranunculus bulbosus (I)
 - Ranunculus fascicularis (N)
 - Ranunculus ficaria var. bulbifera (I)
 - Ranunculus flabellaris (N)
 - Ranunculus hispidus var. caricetorum (N)
 - Ranunculus hispidus var. hispidus (N)
 - Ranunculus hispidus var. nitidus (N)
 - Ranunculus longirostris (N)
 - Ranunculus micranthus (N)
 - Ranunculus parviflorus (I)
 - Ranunculus pensylvanicus (N)
 - Ranunculus pusillus var. pusillus (N)
 - Ranunculus recurvatus var. recurvatus (N)
 - Ranunculus repens (I)
 - Ranunculus sceleratus var. sceleratus (N)
 - Raphanus raphanistrum (I)
 - Raphanus sativus (I)
 - Ratibida columnifera (N)
 - Ratibida pinnata (N)
 - Reseda alba (I)
 - Reseda lutea (I)
 - Reseda luteola (I)
 - Reynoutria japonica (syn. Polygonum cuspidatum) (I)
 - Rhamnus alnifolia (N)
 - Rhamnus cathartica (I)
 - Rhamnus davurica ssp. davurica (I)
 - Rhamnus lanceolata ssp. glabrata (N)
 - Rhamnus lanceolata ssp. lanceolata (N)
 - Rhamnus utilis (I)
 - Rheum rhabarbarum (I)
 - Rhexia virginica (N)
 - Rhododendron calendulaceum (N)
 - Rhododendron maximum (N)
 - Rhododendron periclymenoides (N)
 - Rhododendron prinophyllum (N)
 - Rhodotypos scandens (I)
 - Rhus aromatica var. arenaria (N)
 - Rhus aromatica var. aromatica (N)
 - Rhus copallinum var. latifolia (N)
 - Rhus glabra (N)
 - Rhus pulvinata (N)
 - Rhus typhina (N)
 - Rhynchospora alba (N)
 - Rhynchospora capillacea (N)
 - Rhynchospora capitellata (N)
 - Rhynchospora recognita (N)
 - Ribes americanum (N)
 - Ribes aureum var. villosum (N)
 - Ribes cynosbati (N)
 - Ribes glandulosum (N)
 - Ribes hirtellum (N)
 - Ribes missouriense (N)
 - Ribes nigrum (I)
 - Ribes oxyacanthoides ssp. oxyacanthoides (N)
 - Ribes rotundifolium (N)
 - Ribes rubrum (I)
 - Ribes triste (N)
 - Ribes uva-crispa var. sativum (I)
 - Ricinus communis (I)
 - Robinia × ambigua (N)
 - Robinia hispida var. fertilis (N)
 - Robinia hispida var. hispida (N)
 - Robinia pseudoacacia (N)
 - Robinia viscosa var. viscosa (N)
 - Rorippa palustris ssp. fernaldiana (N)
 - Rorippa palustris ssp. hispida (N)
 - Rorippa sessiliflora (N)
 - Rorippa sylvestris (I)
 - Rosa arkansana var. suffulta (N)
 - Rosa blanda var. blanda (N)
 - Rosa canina (I)
 - Rosa carolina var. carolina (N)
 - Rosa centifolia (I)
 - Rosa cinnamomea (I)
 - Rosa eglanteria (I)
 - Rosa gallica (I)
 - Rosa majalis (I)
 - Rosa micrantha (I)
 - Rosa multiflora (I)
 - Rosa nitida (N)
 - Rosa × palustriformis (N)
 - Rosa palustris (N)
 - Rosa pimpinellifolia (I)
 - Rosa × rudiuscula (N)
 - Rosa rugosa (I)
 - Rosa setigera var. setigera (N)
 - Rosa setigera var. tomentosa (N)
 - Rosa wichuraiana (I)
 - Rotala ramosior (N)
 - Rubus aboriginum (N)
 - Rubus allegheniensis var. allegheniensis (N)
 - Rubus allegheniensis var. gravesii (N)
 - Rubus alumnus (N)
 - Rubus argutus (N)
 - Rubus armeniacus (I)
 - Rubus baileyanus (N)
 - Rubus bellobatus (N)
 - Rubus canadensis (N)
 - Rubus deamii (N)
 - Rubus depavitus (N)
 - Rubus fecundus (N)
 - Rubus flagellaris (N)
 - Rubus frondosus (N)
 - Rubus hispidus (N)
 - Rubus idaeus ssp. strigosus (N)
 - Rubus idaeus ssp. idaeus (I)
 - Rubus invisus (N)
 - Rubus laciniatus (I)
 - Rubus laudatus (N)
 - Rubus meracus (N)
 - Rubus michiganensis (N)
 - Rubus multifer (N)
 - Rubus occidentalis (N)
 - Rubus odoratus var. odoratus (N)
 - Rubus pensilvanicus (N)
 - Rubus pergratus (N)
 - Rubus philadelphicus (N)
 - Rubus phoenicolasius (I)
 - Rubus plicatifolius (N)
 - Rubus prestonensis (N)
 - Rubus pubescens var. pubescens (N)
 - Rubus recurvans (N)
 - Rubus recurvicaulis (N)
 - Rubus roribaccus (N)
 - Rubus rosa (N)
 - Rubus setosus (N)
 - Rubus suus (N)
 - Rubus trivialis (N)
 - Rubus uvidus (N)
 - Rubus vagus (N)
 - Rudbeckia fulgida var. deamii (N)
 - Rudbeckia fulgida var. fulgida (N)
 - Rudbeckia fulgida var. speciosa (N)
 - Rudbeckia fulgida var. umbrosa (N)
 - Rudbeckia grandiflora var. grandiflora (N)
 - Rudbeckia hirta var. hirta (N)
 - Rudbeckia hirta var. pulcherrima (N)
 - Rudbeckia laciniata var. laciniata (N)
 - Rudbeckia triloba var. triloba (N)
 - Ruellia caroliniensis ssp. caroliniensis var. caroliniensis (N)
 - Ruellia caroliniensis ssp. caroliniensis (N)
 - Ruellia humilis (N)
 - Ruellia strepens (N)
 - Rumex acetosa (N)
 - Rumex acetosa ssp. acetosa (I)
 - Rumex acetosella (I)
 - Rumex × acutus (I)
 - Rumex × acutus (N)
 - Rumex altissimus (N)
 - Rumex conglomeratus (I)
 - Rumex crispus ssp. crispus (I)
 - Rumex maritimus (N)
 - Rumex obtusifolius (I)
 - Rumex orbiculatus var. borealis (N)
 - Rumex orbiculatus var. orbiculatus (N)
 - Rumex patientia (I)
 - Rumex salicifolius var. mexicanus (N)
 - Rumex verticillatus (N)
 - Ruppia cirrhosa (N)
 
S
- Sabatia angularis (N)
 - Saccharum alopecuroides (N)
 - Saccharum ravennae (I)
 - Sagina decumbens ssp. decumbens (N)
 - Sagina japonica (I)
 - Sagina procumbens (I)
 - Sagina procumbens (N)
 - Sagittaria australis (N)
 - Sagittaria brevirostra (N)
 - Sagittaria calycina var. calycina (N)
 - Sagittaria cuneata (N)
 - Sagittaria graminea var. graminea (N)
 - Sagittaria latifolia (N)
 - Sagittaria platyphylla (N)
 - Sagittaria rigida (N)
 - Salicornia depressa (N)
 - Salicornia maritima (N)
 - Salix alba (I)
 - Salix amygdaloides (N)
 - Salix bebbiana (N)
 - Salix candida (N)
 - Salix caprea (I)
 - Salix caroliniana (N)
 - Salix cinerea (I)
 - Salix discolor (N)
 - Salix × ehrhartiana (I)
 - Salix × ehrhartiana (N)
 - Salix eriocephala (N)
 - Salix fragilis (I)
 - Salix × glatfelteri (N)
 - Salix humilis var. humilis (N)
 - Salix humilis var. tristis (N)
 - Salix interior (N)
 - Salix lucida ssp. lucida (N)
 - Salix matsudana (I)
 - Salix myricoides var. albovestita (N)
 - Salix myricoides var. myricoides (N)
 - Salix nigra (N)
 - Salix pedicellaris (N)
 - Salix × pendulina (I)
 - Salix pentandra (I)
 - Salix petiolaris (N)
 - Salix purpurea (I)
 - Salix × rubens (I)
 - Salix sericea (N)
 - Salix serissima (N)
 - Salix viminalis (I)
 - Salsola collina (I)
 - Salsola tragus (I)
 - Salvia azurea var. grandiflora (N)
 - Salvia coccinea (N)
 - Salvia farinacea (N)
 - Salvia lyrata (N)
 - Salvia officinalis (I)
 - Salvia pratensis (I)
 - Salvia reflexa (N)
 - Salvia splendens (I)
 - Salvia × superba (I)
 - Salvia × sylvestris (I)
 - Sambucus nigra (I)
 - Sambucus nigra ssp. canadensis (N)
 - Sambucus racemosa var. racemosa (N)
 - Samolus valerandi (I)
 - Samolus valerandi ssp. parviflorus (N)
 - Sanguinaria canadensis (N)
 - Sanguisorba canadensis (N)
 - Sanguisorba minor ssp. balearica (I)
 - Sanicula canadensis var. canadensis (N)
 - Sanicula canadensis var. grandis (N)
 - Sanicula marilandica (N)
 - Sanicula odorata (N)
 - Sanicula smallii (N)
 - Sanicula trifoliata (N)
 - Saponaria officinalis (I)
 - Sarracenia purpurea ssp. purpurea (N)
 - Sassafras albidum (N)
 - Satureja hortensis (I)
 - Saururus cernuus (N)
 - Saxifraga pensylvanica (N)
 - Saxifraga virginiensis var. virginiensis (N)
 - Scabiosa columbaria (I)
 - Scandix pecten-veneris (I)
 - Schedonorus phoenix (I)
 - Schedonorus pratensis (I)
 - Scheuchzeria palustris ssp. americana (N)
 - Schizachne purpurascens (N)
 - Schizachyrium littorale (N)
 - Schizachyrium scoparium var. scoparium (N)
 - Schoenoplectus acutus var. acutus (N)
 - Schoenoplectus fluviatilis (N)
 - Schoenoplectus pungens var. pungens (N)
 - Schoenoplectus purshianus (N)
 - Schoenoplectus saximontanus (N)
 - Schoenoplectus smithii (N)
 - Schoenoplectus subterminalis (N)
 - Schoenoplectus tabernaemontani (N)
 - Schoenoplectus torreyi (N)
 - Scilla siberica (I)
 - Scirpus atrovirens (N)
 - Scirpus cyperinus (N)
 - Scirpus expansus (N)
 - Scirpus georgianus (N)
 - Scirpus hattorianus (N)
 - Scirpus pedicellatus (N)
 - Scirpus pendulus (N)
 - Scirpus polyphyllus (N)
 - Scleranthus annuus (I)
 - Scleria oligantha (N)
 - Scleria pauciflora var. caroliniana (N)
 - Scleria pauciflora var. pauciflora (N)
 - Scleria triglomerata (N)
 - Scleria verticillata (N)
 - Sclerochloa dura (I)
 - Sclerochloa dura (N)
 - Scrophularia lanceolata (N)
 - Scrophularia marilandica (N)
 - Scutellaria elliptica var. elliptica (N)
 - Scutellaria elliptica var. hirsuta (N)
 - Scutellaria galericulata (N)
 - Scutellaria incana var. incana (N)
 - Scutellaria integrifolia (N)
 - Scutellaria lateriflora var. lateriflora (N)
 - Scutellaria nervosa (N)
 - Scutellaria ovata ssp. ovata (N)
 - Scutellaria parvula var. missouriensis (N)
 - Scutellaria parvula var. parvula (N)
 - Scutellaria saxatilis (N)
 - Scutellaria serrata (N)
 - Secale cereale (I)
 - Securigera varia (I)
 - Sedum acre (I)
 - Sedum album (I)
 - Sedum dendroideum (I)
 - Sedum pulchellum (N)
 - Sedum reflexum (I)
 - Sedum sarmentosum (I)
 - Sedum sexangulare (I)
 - Sedum ternatum (N)
 - Selaginella apoda (N)
 - Selaginella eclipes (N)
 - Selaginella rupestris (N)
 - Senecio sylvaticus (I)
 - Senecio vulgaris (I)
 - Senna hebecarpa (N)
 - Senna marilandica (N)
 - Sericocarpus asteroides (N)
 - Sericocarpus linifolius (N)
 - Sesamum orientale (I)
 - Setaria faberi (I)
 - Setaria italica (I)
 - Setaria parviflora (N)
 - Setaria pumila ssp. pumila (I)
 - Setaria verticillata (I)
 - Setaria viridis var. viridis (I)
 - Shepherdia canadensis (N)
 - Sherardia arvensis (I)
 - Sibara virginica (N)
 - Sicyos angulatus (N)
 - Sida hermaphrodita (N)
 - Sida spinosa (N)
 - Silene antirrhina (N)
 - Silene armeria (I)
 - Silene caroliniana ssp. pensylvanica (N)
 - Silene caroliniana ssp. wherryi (N)
 - Silene conica (I)
 - Silene csereii (I)
 - Silene dichotoma (I)
 - Silene dioica (I)
 - Silene latifolia ssp. alba (I)
 - Silene nivea (N)
 - Silene noctiflora (I)
 - Silene nutans (I)
 - Silene regia (N)
 - Silene rotundifolia (N)
 - Silene stellata (N)
 - Silene virginica var. virginica (N)
 - Silene vulgaris (I)
 - Silphium laciniatum var. laciniatum (N)
 - Silphium perfoliatum var. perfoliatum (N)
 - Silphium terebinthinaceum var. luciae-brauniae (N)
 - Silphium terebinthinaceum var. terebinthinaceum (N)
 - Silphium trifoliatum var. latifolium (N)
 - Silphium trifoliatum var. trifoliatum (N)
 - Silybum marianum (I)
 - Sinapis alba (I)
 - Sinapis arvensis ssp. arvensis (I)
 - Sisymbrium altissimum (I)
 - Sisymbrium irio (I)
 - Sisymbrium loeselii (I)
 - Sisymbrium officinale (I)
 - Sisyrinchium albidum (N)
 - Sisyrinchium angustifolium (N)
 - Sisyrinchium atlanticum (N)
 - Sisyrinchium montanum var. crebrum (N)
 - Sisyrinchium mucronatum (N)
 - Sium suave (N)
 - Smallanthus uvedalia (N)
 - Smilax ecirrhata (N)
 - Smilax glauca (N)
 - Smilax herbacea (N)
 - Smilax illinoensis (N)
 - Smilax lasioneura (N)
 - Smilax pulverulenta (N)
 - Smilax rotundifolia (N)
 - Smilax tamnoides (N)
 - Solanum carolinense var. carolinense (N)
 - Solanum dulcamara var. dulcamara (I)
 - Solanum lycopersicum var. lycopersicum (I)
 - Solanum physalifolium (I)
 - Solanum ptychanthum (N)
 - Solanum rostratum (N)
 - Solanum triflorum (N)
 - Solanum tuberosum (I)
 - Solidago altissima (N)
 - Solidago arguta var. arguta (N)
 - Solidago bicolor (N)
 - Solidago caesia (N)
 - Solidago canadensis var. canadensis (N)
 - Solidago canadensis var. gilvocanescens (N)
 - Solidago canadensis var. hargeri (N)
 - Solidago erecta (N)
 - Solidago flexicaulis (N)
 - Solidago gigantea (N)
 - Solidago hispida var. hispida (N)
 - Solidago juncea (N)
 - Solidago nemoralis var. nemoralis (N)
 - Solidago odora var. odora (N)
 - Solidago patula var. patula (N)
 - Solidago puberula var. puberula (N)
 - Solidago rugosa ssp. aspera (N)
 - Solidago rugosa ssp. rugosa var. rugosa (N)
 - Solidago rugosa ssp. rugosa var. villosa (N)
 - Solidago rugosa ssp. rugosa (N)
 - Solidago rupestris (N)
 - Solidago sempervirens var. sempervirens (N)
 - Solidago speciosa var. rigidiuscula (N)
 - Solidago speciosa var. speciosa (N)
 - Solidago sphacelata (N)
 - Solidago squarrosa (N)
 - Solidago uliginosa var. linoides (N)
 - Solidago uliginosa var. uliginosa (N)
 - Solidago ulmifolia var. ulmifolia (N)
 - Sonchus arvensis ssp. arvensis (I)
 - Sonchus arvensis ssp. uliginosus (I)
 - Sonchus asper (I)
 - Sonchus oleraceus (I)
 - Sorbaria sorbifolia (I)
 - Sorbus aucuparia (I)
 - Sorbus decora (N)
 - Sorghastrum nutans (N)
 - Sorghum bicolor ssp. bicolor (I)
 - Sorghum halepense (I)
 - Sparganium americanum (N)
 - Sparganium androcladum (N)
 - Sparganium emersum (I)
 - Sparganium emersum (N)
 - Sparganium eurycarpum (N)
 - Spartina pectinata (N)
 - Spergula arvensis (I)
 - Spergularia maritima (I)
 - Spergularia rubra (I)
 - Spergularia salina (N)
 - Spermacoce glabra (N)
 - Sphenopholis intermedia (N)
 - Sphenopholis nitida (N)
 - Sphenopholis obtusata (N)
 - Sphenopholis × pallens (N)
 - Sphenopholis pensylvanica (N)
 - Spinacia oleracea (I)
 - Spiraea alba var. alba (N)
 - Spiraea alba var. latifolia (N)
 - Spiraea japonica var. fortunei (I)
 - Spiraea prunifolia (I)
 - Spiraea tomentosa (N)
 - Spiraea × vanhouttei (I)
 - Spiraea virginiana (N)
 - Spiranthes cernua (N)
 - Spiranthes lacera var. gracilis (N)
 - Spiranthes lacera var. lacera (N)
 - Spiranthes lucida (N)
 - Spiranthes magnicamporum (N)
 - Spiranthes ochroleuca (N)
 - Spiranthes ovalis var. erostellata (N)
 - Spiranthes romanzoffiana (N)
 - Spiranthes tuberosa (N)
 - Spiranthes vernalis (N)
 - Spirodela polyrrhiza (N)
 - Sporobolus compositus var. compositus (N)
 - Sporobolus cryptandrus (N)
 - Sporobolus heterolepis (N)
 - Sporobolus neglectus (N)
 - Sporobolus vaginiflorus var. ozarkanus (N)
 - Sporobolus vaginiflorus var. vaginiflorus (N)
 - Stachys aspera (N)
 - Stachys cordata (N)
 - Stachys germanica (I)
 - Stachys palustris (N)
 - Stachys pilosa var. arenicola (N)
 - Stachys sylvatica (I)
 - Stachys tenuifolia (N)
 - Staphylea trifolia (N)
 - Stellaria alsine (N)
 - Stellaria corei (N)
 - Stellaria graminea (I)
 - Stellaria holostea (I)
 - Stellaria longifolia var. longifolia (N)
 - Stellaria media ssp. media (I)
 - Stellaria media ssp. pallida (I)
 - Stellaria pubera (N)
 - Stenanthium gramineum var. gramineum (N)
 - Stenanthium gramineum var. robustum (N)
 - Stenaria nigricans var. nigricans (N)
 - Stenosiphon linifolius (N)
 - Streptopus lanceolatus var. lanceolatus (N)
 - Streptopus lanceolatus var. roseus (N)
 - Strophostyles helvola (N)
 - Strophostyles leiosperma (N)
 - Strophostyles umbellata (N)
 - Stuckenia filiformis ssp. alpina (N)
 - Stuckenia pectinata (N)
 - Stuckenia vaginata (N)
 - Stylophorum diphyllum (N)
 - Stylosanthes biflora (N)
 - Styphnolobium japonicum (I)
 - Styrax americanus (N)
 - Styrax grandifolius (N)
 - Suaeda calceoliformis (N)
 - Sullivantia sullivantii (N)
 - Symphoricarpos albus var. albus (N)
 - Symphoricarpos albus var. laevigatus (N)
 - Symphoricarpos occidentalis (N)
 - Symphoricarpos orbiculatus (N)
 - Symphyotrichum boreale (N)
 - Symphyotrichum ciliatum (N)
 - Symphyotrichum cordifolium (N)
 - Symphyotrichum drummondii var. drummondii (N)
 - Symphyotrichum dumosum var. strictior (N)
 - Symphyotrichum ericoides var. ericoides (N)
 - Symphyotrichum laeve var. laeve (N)
 - Symphyotrichum lanceolatum ssp. lanceolatum var. hirsuticaule (N)
 - Symphyotrichum lanceolatum ssp. lanceolatum var. interior (N)
 - Symphyotrichum lanceolatum ssp. lanceolatum var. lanceolatum (N)
 - Symphyotrichum lanceolatum ssp. lanceolatum var. latifolium (N)
 - Symphyotrichum lanceolatum ssp. lanceolatum (N)
 - Symphyotrichum lateriflorum var. lateriflorum (N)
 - Symphyotrichum lowrieanum (N)
 - Symphyotrichum novae-angliae (N)
 - Symphyotrichum oblongifolium (N)
 - Symphyotrichum ontarionis (N)
 - Symphyotrichum oolentangiense var. oolentangiense (N)
 - Symphyotrichum patens var. patens (N)
 - Symphyotrichum phlogifolium (N)
 - Symphyotrichum pilosum var. pilosum (N)
 - Symphyotrichum pilosum var. pringlei (N)
 - Symphyotrichum praealtum var. praealtum (N)
 - Symphyotrichum prenanthoides (N)
 - Symphyotrichum puniceum var. puniceum (N)
 - Symphyotrichum racemosum (N)
 - Symphyotrichum sericeum (N)
 - Symphyotrichum shortii (N)
 - Symphyotrichum subulatum (N)
 - Symphyotrichum undulatum (N)
 - Symphyotrichum urophyllum (N)
 - Symphytum asperum (I)
 - Symphytum officinale (I)
 - Symplocarpus foetidus (N)
 - Synandra hispidula (N)
 - Syringa vulgaris (I)
 
T
- Taenidia integerrima (N)
 - Tagetes erecta (I)
 - Tagetes patula (I)
 - Tamarix chinensis (I)
 - Tanacetum balsamita (I)
 - Tanacetum coccineum (I)
 - Tanacetum parthenium (I)
 - Tanacetum vulgare (I)
 - Taraxacum laevigatum (I)
 - Taraxacum officinale (N)
 - Taraxacum officinale ssp. officinale (I)
 - Taxodium distichum (N)
 - Taxus canadensis (N)
 - Taxus cuspidata (I)
 - Tephrosia virginiana (N)
 - Tetradium daniellii (I)
 - Tetragonia tetragonioides (I)
 - Tetraneuris herbacea (N)
 - Teucrium canadense var. canadense (N)
 - Teucrium canadense var. occidentale (N)
 - Thalictrum dasycarpum (N)
 - Thalictrum dioicum (N)
 - Thalictrum pubescens (N)
 - Thalictrum revolutum (N)
 - Thalictrum thalictroides (N)
 - Thaspium barbinode (N)
 - Thaspium trifoliatum var. aureum (N)
 - Thaspium trifoliatum var. trifoliatum (N)
 - Thelypteris noveboracensis (N)
 - Thelypteris palustris var. pubescens (N)
 - Thlaspi alliaceum (I)
 - Thlaspi arvense (I)
 - Thuja occidentalis (N)
 - Thymelaea passerina (I)
 - Thymelaea passerina (N)
 - Thymus praecox ssp. arcticus (I)
 - Tiarella cordifolia var. cordifolia (N)
 - Tilia americana var. americana (N)
 - Tilia americana var. heterophylla (N)
 - Tilia × europaea (I)
 - Tipularia discolor (N)
 - Torilis arvensis ssp. arvensis (N)
 - Torilis arvensis ssp. arvensis (I)
 - Torilis japonica (I)
 - Torreyochloa pallida var. pallida (N)
 - Toxicodendron radicans ssp. negundo (N)
 - Toxicodendron rydbergii (N)
 - Toxicodendron vernix (N)
 - Tradescantia ohiensis (N)
 - Tradescantia subaspera var. subaspera (N)
 - Tradescantia virginiana (N)
 - Tragopogon dubius (I)
 - Tragopogon lamottei (I)
 - Tragopogon porrifolius (I)
 - Triadenum fraseri (N)
 - Triadenum tubulosum (N)
 - Triadenum virginicum (N)
 - Triadenum walteri (N)
 - Triantha glutinosa (N)
 - Tribulus terrestris (I)
 - Trichomanes boschianum (N)
 - Trichomanes intricatum (N)
 - Trichophorum planifolium (N)
 - Trichostema brachiatum (N)
 - Trichostema dichotomum (N)
 - Trichostema setaceum (N)
 - Tridens flavus var. flavus (N)
 - Trientalis borealis ssp. borealis (N)
 - Trifolium ambiguum (I)
 - Trifolium arvense (I)
 - Trifolium aureum (I)
 - Trifolium campestre (I)
 - Trifolium dubium (I)
 - Trifolium hybridum (I)
 - Trifolium incarnatum (I)
 - Trifolium pratense (I)
 - Trifolium reflexum (N)
 - Trifolium repens (I)
 - Trifolium resupinatum (I)
 - Trifolium stoloniferum (N)
 - Triglochin maritima (N)
 - Triglochin palustris (N)
 - Trillium cernuum (N)
 - Trillium erectum (N)
 - Trillium flexipes (N)
 - Trillium grandiflorum (N)
 - Trillium nivale (N)
 - Trillium recurvatum (N)
 - Trillium sessile (N)
 - Trillium undulatum (N)
 - Triodanis perfoliata (N)
 - Triosteum angustifolium (N)
 - Triosteum aurantiacum var. aurantiacum (N)
 - Triosteum aurantiacum var. glaucescens (N)
 - Triosteum aurantiacum var. illinoense (N)
 - Triosteum perfoliatum (N)
 - Triphora trianthophora (N)
 - Triplasis purpurea (N)
 - Tripleurospermum maritimum (N)
 - Tripleurospermum maritimum ssp. maritimum (I)
 - Tripsacum dactyloides (N)
 - Triticum aestivum (I)
 - Trollius laxus ssp. laxus (N)
 - Tsuga canadensis (N)
 - Tulipa gesneriana (I)
 - Tussilago farfara (I)
 - Typha angustifolia (I)
 - Typha angustifolia (N)
 - Typha × glauca (N)
 - Typha latifolia (N)
 
U
- Ulmus americana (N)
 - Ulmus procera (I)
 - Ulmus pumila (I)
 - Ulmus rubra (N)
 - Ulmus thomasii (N)
 - Urtica chamaedryoides (N)
 - Urtica dioica ssp. gracilis (N)
 - Urtica dioica ssp. dioica (I)
 - Utricularia cornuta (N)
 - Utricularia geminiscapa (N)
 - Utricularia gibba (N)
 - Utricularia intermedia (N)
 - Utricularia macrorhiza (N)
 - Utricularia minor (N)
 - Uvularia grandiflora (N)
 - Uvularia perfoliata (N)
 - Uvularia sessilifolia (N)
 
V
- Vaccaria hispanica (I)
 - Vaccinium angustifolium (N)
 - Vaccinium corymbosum (N)
 - Vaccinium fuscatum (N)
 - Vaccinium macrocarpon (N)
 - Vaccinium myrtilloides (N)
 - Vaccinium oxycoccos (N)
 - Vaccinium pallidum (N)
 - Vaccinium simulatum (N)
 - Vaccinium stamineum (N)
 - Valeriana edulis var. ciliata (N)
 - Valeriana officinalis (I)
 - Valeriana pauciflora (N)
 - Valeriana uliginosa (N)
 - Valerianella chenopodiifolia (N)
 - Valerianella locusta (I)
 - Valerianella radiata (N)
 - Valerianella umbilicata (N)
 - Vallisneria americana (N)
 - Veratrum virginicum (N)
 - Veratrum viride (N)
 - Veratrum woodii (N)
 - Verbascum blattaria (I)
 - Verbascum phlomoides (I)
 - Verbascum phoeniceum (I)
 - Verbascum thapsus (I)
 - Verbascum virgatum (I)
 - Verbena bracteata (N)
 - Verbena × engelmannii (N)
 - Verbena hastata var. hastata (N)
 - Verbena × moechina (N)
 - Verbena simplex (N)
 - Verbena stricta (N)
 - Verbena urticifolia var. leiocarpa (N)
 - Verbena urticifolia var. urticifolia (N)
 - Verbesina alternifolia (N)
 - Verbesina helianthoides (N)
 - Verbesina occidentalis (N)
 - Verbesina virginica var. virginica (N)
 - Vernonia arkansana (N)
 - Vernonia fasciculata ssp. fasciculata (N)
 - Vernonia gigantea ssp. gigantea (N)
 - Vernonia × illinoensis (N)
 - Vernonia missurica (N)
 - Vernonia noveboracensis (N)
 - Veronica agrestis (I)
 - Veronica americana (N)
 - Veronica anagallis-aquatica (N)
 - Veronica arvensis (I)
 - Veronica austriaca ssp. teucrium (I)
 - Veronica beccabunga (I)
 - Veronica chamaedrys (I)
 - Veronica filiformis (I)
 - Veronica hederifolia (I)
 - Veronica officinalis var. officinalis (I)
 - Veronica peregrina ssp. peregrina (N)
 - Veronica peregrina ssp. xalapensis (N)
 - Veronica persica (I)
 - Veronica polita (I)
 - Veronica scutellata (N)
 - Veronica serpyllifolia (N)
 - Veronica serpyllifolia ssp. serpyllifolia (I)
 - Veronica verna (I)
 - Veronicastrum virginicum (N)
 - Viburnum acerifolium (N)
 - Viburnum buddleifolium (I)
 - Viburnum dentatum var. dentatum (N)
 - Viburnum dentatum var. venosum (N)
 - Viburnum lantana (I)
 - Viburnum lantanoides (N)
 - Viburnum lentago (N)
 - Viburnum molle (N)
 - Viburnum nudum var. cassinoides (N)
 - Viburnum opulus var. americanum (N)
 - Viburnum opulus var. opulus (I)
 - Viburnum plicatum (I)
 - Viburnum prunifolium (N)
 - Viburnum rafinesqueanum (N)
 - Viburnum recognitum (N)
 - Viburnum × rhytidophylloides (I)
 - Viburnum rufidulum (N)
 - Vicia americana ssp. americana (N)
 - Vicia caroliniana (N)
 - Vicia cracca ssp. cracca (I)
 - Vicia hirsuta (I)
 - Vicia sativa ssp. nigra (I)
 - Vicia sativa ssp. sativa (I)
 - Vicia tetrasperma (I)
 - Vicia villosa ssp. varia (I)
 - Vicia villosa ssp. villosa (I)
 - Vigna unguiculata (I)
 - Vinca major (I)
 - Vinca minor (I)
 - Viola affinis (N)
 - Viola arvensis (I)
 - Viola × bernardii (N)
 - Viola bicolor (N)
 - Viola × bissellii (N)
 - Viola blanda var. blanda (N)
 - Viola blanda var. palustriformis (N)
 - Viola × brauniae (N)
 - Viola canadensis var. canadensis (N)
 - Viola × conjugens (N)
 - Viola × consobrina (N)
 - Viola × cooperrideri (N)
 - Viola × cordifolia (N)
 - Viola cucullata (N)
 - Viola × eclipes (N)
 - Viola × filicetorum (N)
 - Viola hastata (N)
 - Viola hirsutula (N)
 - Viola labradorica (N)
 - Viola lanceolata ssp. lanceolata (N)
 - Viola macloskeyi ssp. pallens (N)
 - Viola × malteana (N)
 - Viola missouriensis (N)
 - Viola nephrophylla (N)
 - Viola odorata (I)
 - Viola × palmata (N)
 - Viola pedata (N)
 - Viola pedatifida (N)
 - Viola × populifolia (N)
 - Viola × primulifolia (N)
 - Viola pubescens var. pubescens (N)
 - Viola pubescens var. scabriuscula (N)
 - Viola × ravida (N)
 - Viola rostrata (N)
 - Viola rotundifolia (N)
 - Viola sagittata var. ovata (N)
 - Viola sagittata var. sagittata (N)
 - Viola selkirkii (N)
 - Viola × slavinii (N)
 - Viola sororia (N)
 - Viola striata (N)
 - Viola tricolor (I)
 - Viola triloba var. dilatata (N)
 - Viola triloba var. triloba (N)
 - Viola tripartita (N)
 - Viola walteri (N)
 - Viola × wittrockiana (I)
 - Vitex negundo var. heterophylla (I)
 - Vitis aestivalis var. aestivalis (N)
 - Vitis aestivalis var. bicolor (N)
 - Vitis cinerea var. baileyana (N)
 - Vitis labrusca (N)
 - Vitis riparia (N)
 - Vitis vulpina (N)
 - Vittaria appalachiana (N)
 - Vulpia bromoides (I)
 - Vulpia myuros (I)
 - Vulpia octoflora var. glauca (N)
 
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References
External links
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