List of Nebraska Plants

Browse by Genus

< Botany Home

From 'The Flora of Nebraska' by Kaul, Sutherland, and Rolfsmeier, 2011.

Year of first collection is given for most introduced species.

 

A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z

A

Abronia fragrans
Abutilon theophrasti, 1886
Acalypha ostryifolia
Acalypha rhomboidea
Acalypha virginica
Acer ginnala
Acer glabrum
Acer negundo
Acer platanoides
Acer saccharinum
Achillea millefolium
Acorus americanus
Acorus calamus, 1974
Actaea pachypoda
Actaea rubra
Adiantum pedatum
Aegilops cylindrica, 1966
Aesculus glabra v. arguta
Agalinis aspera
Agalinis purpurea
Agalinis skinneriana
Agalinis tenuifolia v. macrophylla
Agalinis tenuifolia v. parvifolia
Agastache foeniculum
Agastache nepetoides
Agastache scrophulariifolia
Ageratina altissima
Agoseris glauca
Agrimonia gryposepala
Agrimonia parviflora
Agrimonia pubescens
Agrimonia striata
Agropyron cristatum, 1961
Agrostemma githago, 1909
Agrostis exarata ssp. minor
Agrostis hyemalis
Agrostis scabra
Agrostis stolonifera, 1886
Ailanthus altissima, 1911
Alcea rosea
Alisma gramineum
Alisma triviale
Alliaria petiolata, 1975
Allium canadense v. canadense
Allium canadense v. fraseri
Allium canadense v. lavendulare
Allium cepa
Allium cernuum
Allium drummondii
Allium perdulce
Allium sativum
Allium schoenoprasum
Allium textile
Allium tricoccum v. burdickii
Allium tuberosum
Allium vineale, 1967
Alopecurus aequalis
Alopecurus arundinaceus, 1989
Alopecurus carolinianus
Alopecurus geniculatus
Alopecurus pratensis, 1968
Althaea officinalis
Alyssum alyssoides, 1890
Alyssum desertorum, 1950
Alyssum simplex, 1995
Amaranthus albus
Amaranthus arenicola
Amaranthus blitoides
Amaranthus californicus
Amaranthus cruentus, 1907
Amaranthus hybridus
Amaranthus hypochondriacus
Amaranthus palmeri
Amaranthus powellii, 1977
Amaranthus retroflexus
Amaranthus spinosus, 1881
Amaranthus tuberculatus
Ambrosia acanthicarpa
Ambrosia artemisiifolia
Ambrosia grayi
Ambrosia psilostachya
Ambrosia tomentosa
Ambrosia trifida
Amelanchier alnifolia
Amelanchier arborea
Amelanchier humilis
Ammannia auriculata
Ammannia coccinea
Ammannia robusta
Amorpha canescens
Amorpha fruticosa
Amorpha nana
Ampelopsis cordata
Amphicarpaea bracteata
Amphiscirpus nevadensis
Amsinckia intermedia, 1914
Amsinckia lycopsoides, 1906
Anagallis arvensis, 1898
Anagallis minima
Anaphalis margaritacea
Andropogon gerardii ssp. gerardii
Andropogon gerardii ssp. hallii
Andropogon x chrysocomis
Androsace occidentalis
Anemone canadensis
Anemone caroliniana
Anemone cylindrica
Anemone multifida
Anemone patens v. multifida
Anemone virginiana
Anemopsis californica, 1991
Anethum graveolens
Antennaria dimorpha
Antennaria howellii ssp. neodioica
Antennaria microphylla
Antennaria neglecta
Antennaria parlinii ssp. fallax
Antennaria parvifolia
Anthemis arvensis, 1914
Anthemis cotula, 1877
Anthriscus caucalis, 1999
Apios americana
Apocynum androsaemifolium
Apocynum cannabinum
Apocynum x floribundum
Aquilegia canadensis
Arabidopsis thaliana
Arabis canadensis
Arabis glabra
Arabis hirsuta v. pycnocarpa
Arabis holboellii v. collinsii
Arabis holboellii v. pinetorum
Arabis shortii
Aralia nudicaulis
Aralia racemosa
Arctium minus, 1885
Arctium tomentosum, 1978
Arctostaphylos uva-ursi
Arenaria lateriflora
Arenaria serpyllifolia, 1885
Argemone hispida, 1975
Argemone polyanthemos
Argyrochosma dealbata
Arisaema dracontium
Arisaema triphyllum
Aristida basiramea
Aristida curtissii
Aristida desmantha, 1892
Aristida longespica v. geniculata
Aristida oligantha
Aristida purpurascens
Aristida purpurea v. longiseta
Aristida purpurea v. robusta
Aristida tuberculosa, 1974
Armoracia rusticana,1958
Arnoglossum atriplicifolium
Arnoglossum plantagineum
Artemisia absinthium, 1995
Artemisia annua, 1990
Artemisia biennis
Artemisia campestris ssp. borealis
Artemisia campestris ssp. caudata
Artemisia cana
Artemisia carruthii
Artemisia dracunculus ssp. dracunculus
Artemisia dracunculus ssp. glauca
Artemisia filifolia
Artemisia frigida
Artemisia ludoviciana v. ludoviciana
Artemisia ludoviciana v. mexicana
Artemisia tridentata v. wyomingensis
Asarum canadense, 1950s
Asclepias amplexicaulis
Asclepias arenaria
Asclepias asperula ssp. capricornu
Asclepias engelmanniana
Asclepias incarnata
Asclepias lanuginosa
Asclepias latifolia
Asclepias pumila
Asclepias purpurascens
Asclepias speciosa
Asclepias speciosa x syriaca
Asclepias stenophylla
Asclepias sullivantii
Asclepias syriaca
Asclepias tuberosa ssp. interior
Asclepias verticillata
Asclepias viridiflora
Asclepias viridis
Asimina triloba
Asparagus officinalis
Asperugo procumbens, 1961
Asplenium platyneuron
Aster ascendens
Aster borealis
Aster brachyactis
Aster drummondii
Aster ericoides ssp. ericoides
Aster ericoides ssp. pansus
Aster falcatus ssp. commutatus
Aster fendleri
Aster laevis v. geyeri
Aster laevis v. laevis
Aster lanceolatus ssp. hesperius
Aster lanceolatus ssp. lanceolatus
Aster lateriflorus
Aster novae-angliae
Aster oblongifolius
Aster ontarionis
Aster oolentangiensis
Aster pilosus
Aster praealtus v. nebraskensis
Aster sagittifolius
Aster sericeus
Aster subulatus v. ligulatus
Aster subulatus v. subulatus
Aster urophyllus
Astragalus agrestis
Astragalus barrii
Astragalus bisulcatus
Astragalus bodinii
Astragalus canadensis
Astragalus ceramicus v. filifolius
Astragalus cicer, 1977
Astragalus crassicarpus
Astragalus drummondii
Astragalus flexuosus
Astragalus gilviflorus
Astragalus gracilis
Astragalus hyalinus
Astragalus kentrophyta
Astragalus laxmanii v. robustior
Astragalus lotiflorus
Astragalus missouriensis
Astragalus mollissimus
Astragalus pectinatus
Astragalus plattensis
Astragalus racemosus
Astragalus sericoleucus
Astragalus shortianus
Astragalus spatulatus
Astragalus tenellus
Athyrium filix-femina ssp. cyclosorum
Atriplex argentea
Atriplex canescens v. aptera
Atriplex canescens v. canescens
Atriplex dioica Raf.
Atriplex heterosperma, 1970
Atriplex hortensis, 1890s
Atriplex patula, 1934
Atriplex powellii
Atriplex prostrata, 1990s
Atriplex rosea, 1912
Atriplex suckleyi
Avena fatua v. fatua, 1962
Avena fatua v. sativa, 1886
Azolla mexicana

Return to top

B

Bacopa rotundifolia
Ballota nigra, 1983
Baptisia alba v. macrophylla
Baptisia australis v. australis
Baptisia australis v. minor
Baptisia bracteata v. leucophaea
Barbarea vulgaris, 1907
Beckmannia syzigachne
Belamcanda chinensis, 1907
Berberis repens
Berberis thunbergii, 1991
Berberis vulgaris; 1880s
Bergia texana
Berteroa incana, 1909
Berula erecta v. incisa
Besseya wyomingensis
Betula occidentalis
Betula papyrifera
Bidens aristosa v. retrorsa
Bidens bipinnata
Bidens cernua
Bidens comosa
Bidens connata v. gracilipes
Bidens connata v. petiolata
Bidens coronata
Bidens frondosa
Bidens polylepis
Bidens vulgata
Blephilia hirsuta
Boehmeria cylindrica
Bolboschoenus fluviatilis
Bolboschoenus maritimus ssp. paludosus
Boltonia asteroides v. latisquama
Boltonia asteroides v. recognita
Bothriochloa bladhii
Bothriochloa ischaemum
Bothriochloa laguroides ssp. torreyana
Botrychium campestre
Botrychium simplex
Botrychium virginianum
Bouteloua curtipendula
Bouteloua gracilis
Bouteloua hirsuta
Bouteloua simplex, 1992
Brachyelytrum erectum
Brasenia schreberi
Brassica juncea, 1890
Brassica nigra, 1875
Brassica rapa ssp. campestris, 1897
Brickellia eupatorioides v. corymbulosa
Brickellia grandiflora
Bromus biebersteinii
Bromus briziformis, 1911
Bromus carinatus
Bromus ciliatus
Bromus hordeaceus, 1892
Bromus inermis, 1902
Bromus japonicus, 1900
Bromus latiglumis
Bromus porteri
Bromus pubescens
Bromus secalinus, 1889
Bromus squarrosus, 1909
Bromus tectorum,1897
Buchloe dactyloides
Bulbostylis capillaris
Butomus umbellatus,1999

Return to top

C

Calamagrostis canadensis
Calamagrostis stricta
Calamovilfa gigantea
Calamovilfa longifolia
Callirhoe alcaeoides
Callirhoe involucrata
Callitriche hermaphroditica
Callitriche palustris
Calochortus gunnisonii
Calochortus nuttallii
Caltha palustris
Calylophus lavandulifolius
Calylophus serrulatus
Calystegia macounii
Calystegia sepium ssp. angulata
Camelina microcarpa
Camelina sativa, 1889
Campanula americana
Campanula aparinoides
Campanula rapunculoides
Campanula rotundifolia
Campsis radicans
Cannabis sativa, 1877
Capsella bursa-pastoris, 1884
Caragana arborescens
Cardamine bulbosa
Cardamine concatenata
Cardamine flexuosa
Cardamine pensylvanica
Carduus acanthoides, 1930
Carduus nutans, 1932
Carex aggregata
Carex albicans v. albicans
Carex albursina
Carex aquatilis v. substricta
Carex atherodes
Carex aurea
Carex aureolensis
Carex austrina
Carex bebbii
Carex bicknellii
Carex blanda
Carex brachyglossa
Carex brevior
Carex bushii
Carex buxbaumii
Carex cephalophora
Carex comosa
Carex conjuncta
Carex crawei
Carex crinita
Carex cristatella
Carex crus-corvi
Carex davisii
Carex diandra
Carex douglasii
Carex eburnea
Carex eleocharis
Carex emoryi
Carex filifolia
Carex frankii
Carex granularis v. haleana
Carex gravida
Carex grisea
Carex heliophila
Carex hirtifolia
Carex hitchcockiana
Carex hyalinolepis
Carex hystericina
Carex interior
Carex jamesii
Carex lacustris
Carex laeviconica
Carex laeviconica x trichocarpa
Carex lasiocarpa
Carex leavenworthii
Carex limosa
Carex lupulina
Carex meadii
Carex melanostachya, 1989
Carex mesochorea
Carex missouriensis
Carex molesta
Carex nebrascensis
Carex normalis
Carex oligocarpa
Carex parryana v. unica
Carex peckii
Carex pellita
Carex praegracilis
Carex prairea
Carex radiata
Carex rosea
Carex rossii
Carex sartwellii
Carex saximontana
Carex scoparia
Carex sparganioides
Carex sprengelii
Carex squarrosa
Carex stipata
Carex tenera v. echinodes
Carex tetanica
Carex texensis, 1991
Carex tribuloides
Carex umbellata
Carex utriculata
Carex vesicaria
Carex vulpinoidea
Carex xerantica
Carthamus tinctorius
Carya cordiformis
Carya ovata
Castilleja sessiliflora
Catabrosa aquatica
Catalpa bignonioides
Catalpa speciosa
Caulophyllum thalictroides
Ceanothus americanus v. pitcheri
Ceanothus herbaceus v. pubescens
Celastrus scandens
Celtis occidentalis
Cenchrus longispinus
Centaurea cyanus, 1892
Centaurea diffusa, 1990
Centaurea nigra, 1992
Centaurea repens, 1931
Centaurea solstitialis, 1908
Centaurea stoebe ssp. micranthos, 1917
Centaurium exaltatum
Centaurium pulchellum, 1981
Cephalanthus occidentalis
Cerastium arvense ssp. strictum
Cerastium brachypodum
Cerastium fontanum ssp. vulgare, 1890
Cerastium nutans
Cerastium semidecandrum, 1987
Ceratophyllum demersum
Cercis canadensis
Cercocarpus montanus
Chaenactis douglasii
Chaenorrhinum minus
Chaerophyllum procumbens
Chaerophyllum tainturieri
Chaetopappa ericoides
Chamaecrista fasciculata
Chamerion angustifolium
Chasmanthium latifolium, 1999
Cheilanthes feei
Chelidonium majus
Chenopodium album
Chenopodium ambrosioides, 1898
Chenopodium berlandieri
Chenopodium botrys, 1891
Chenopodium capitatum, 1891
Chenopodium cycloides
Chenopodium desiccatum
Chenopodium fremontii
Chenopodium glaucum v. glaucum, 1897
Chenopodium glaucum v. salinum
Chenopodium incanum
Chenopodium missouriense
Chenopodium pallescens
Chenopodium pratericola
Chenopodium rubrum
Chenopodium simplex
Chenopodium standleyanum
Chenopodium strictum
Chenopodium subglabrum
Chenopodium urbicum, 1889
Chloris verticillata
Chloris virgata, 1972
Chorispora tenella, 1914
Chrysothamnus viscidiflorus
Cichorium intybus, 1880
Cicuta bulbifera
Cicuta maculata v. angustifolia
Cicuta maculata v. bolanderi
Cicuta maculata v. maculata
Cinna arundinacea
Circaea lutetiana ssp. canadensis
Cirsium altissimum
Cirsium arvense, 1886
Cirsium canescens
Cirsium discolor
Cirsium flodmanii
Cirsium ochrocentrum
Cirsium undulatum
Cirsium vulgare, 1890
Claytonia virginica
Clematis fremontii
Clematis hirsutissima
Clematis ligusticifolia
Clematis pitcheri
Clematis terniflora
Clematis virginiana
Cleome hassleriana
Cleome serrulata
Cleomella angustifolia
Coeloglossum viride v. virescens
Collinsia parviflora
Collomia linearis
Comandra umbellata ssp. pallida
Comandra umbellata ssp. umbellata
Commelina communis, 1914
Commelina erecta v. angustifolia
Conioselinum chinense, 1905
Conium maculatum, 1936
Conringia orientalis, 1908
Consolida ajacis
Convallaria majalis
Convolvulus arvensis, 1889
Conyza canadensis
Conyza ramosissima
Corallorhiza maculata v. occidentalis
Corallorhiza odontorhiza
Corallorhiza striata v. flavida
Corallorhiza wisteriana
Coreopsis lanceolata
Coreopsis palmata
Coreopsis tinctoria
Corispermum americanum
Corispermum villosum
Corispermum welshii
Cornus alternifolia
Cornus amomum ssp. obliqua
Cornus drummondii
Cornus sericea
Corydalis aurea
Corydalis curvisiliqua ssp. occidentalis
Corydalis flavula
Corydalis micrantha
Corylus americana
Coryphantha missouriensis
Coryphantha vivipara
Crataegus chrysocarpa
Crataegus macracantha v. occidentalis
Crataegus mollis
Crepis atribarba
Crepis occidentalis ssp. costata
Crepis runcinata
Crepis tectorum, 1891
Crotalaria sagittalis, 1873
Croton capitatus
Croton glandulosus v. septentrionalis
Croton monanthogynus
Croton texensis
Cryptantha cana
Cryptantha celosioides
Cryptantha cinerea v. jamesii
Cryptantha fendleri
Cryptantha minima
Cryptantha thyrsiflora
Cryptotaenia canadensis
Cucurbita foetidissima
Cuphea viscosissima
Cuscuta approximata
Cuscuta campestris
Cuscuta cephalanthi
Cuscuta coryli
Cuscuta cuspidata
Cuscuta epithymum, 1903
Cuscuta glomerata
Cuscuta gronovii
Cuscuta indecora
Cuscuta polygonorum
Cuscuta umbrosa
Cyclanthera dissecta
Cycloloma atriplicifolium
Cymbalaria muralis
Cymopterus acaulis
Cymopterus montanus
Cynanchum laeve
Cynodon dactylon
Cynodon transvaalensis, 1968
Cynoglossum officinale, 1873
Cyperus acuminatus
Cyperus bipartitus
Cyperus diandrus
Cyperus difformis, 1968
Cyperus engelmannii
Cyperus erythrorhizos
Cyperus esculentus v. leptostachyus
Cyperus fuscus, 1968
Cyperus lupulinus ssp. lupulinus
Cyperus lupulinus ssp. macilentus
Cyperus lupulinus x schweinitzii
Cyperus odoratus
Cyperus schweinitzii
Cyperus squarrosus
Cyperus strigosus
Cypripedium candidum
Cypripedium parviflorum
Cystopteris bulbifera
Cystopteris fragilis
Cystopteris protrusa
Cystopteris tenuis

Return to top

D

Dactylis glomerata, 1885
Dalea aurea
Dalea candida v. candida
Dalea candida v. oligophylla
Dalea cylindriceps
Dalea enneandra
Dalea leporina
Dalea multiflora
Dalea purpurea v. arenicola
Dalea purpurea v. purpurea
Dalea villosa
Danthonia spicata
Dasistoma macrophylla
Datura stramonium, 1872
Datura wrightii
Daucus carota, 1894
Delphinium geyeri
Delphinium nuttallianum
Delphinium tricorne
Delphinium virescens
Deschampsia cespitosa, 2005
Descurainea pinnata
Descurainia sophia, 1897
Desmanthus illinoensis
Desmodium canadense
Desmodium canescens
Desmodium cuspidatum
Desmodium glutinosum
Desmodium illinoense
Desmodium paniculatum
Desmodium perplexum
Desmodium sessilifolium
Dianthus armeria, 1935
Dianthus barbatus, 1978
Diarrhena obovata
Dicentra cucullaria
Dieteria canescens v. canescens
Dieteria canescens v. glabra
Dieteria canescens v. nebraskana
Digitalis lanata, 1991
Digitaria ciliaris, 1967
Digitaria cognata
Digitaria ischaemum, 1898
Digitaria sanguinalis, 1884
Diodia teres
Dioscorea villosa
Diospyros virginiana, 1979
Diplotaxis muralis, 1916
Dipsacus fullonum, 1974
Dipsacus laciniatus, 1972
Distichlis spicata
Dodecatheon pulchellum
Doellingeria umbellata v. pubens
Draba brachycarpa
Draba cuneifolia
Draba nemorosa
Draba reptans
Dracocephalum moldavica, 1889
Dracocephalum parviflorum
Drymocallis arguta
Dryopteris carthusiana
Dryopteris cristata
Dulichium arundinaceum
Dyssodia papposa

Return to top

E

Echinacea angustifolia
Echinacea pallida
Echinacea purpurea
Echinocereus viridiflorus
Echinochloa crus-galli, 1891
Echinochloa muricata v. microstachya
Echinochloa muricata v. muricata
Echinocystis lobata
Echinodorus berteroi
Echinops sphaerocephalus, 1960s
Echium vulgare, 1888
Eclipta prostrata
Elaeagnus angustifolia
Elaeagnus umbellata, 1986
Elatine brachysperma
Elatine rubella
Eleocharis acicularis
Eleocharis atropurpurea
Eleocharis coloradoensis
Eleocharis compressa
Eleocharis elliptica
Eleocharis engelmannii
Eleocharis erythropoda
Eleocharis geniculata
Eleocharis obtusa
Eleocharis palustris
Eleocharis quinqueflora
Eleocharis rostellata
Eleocharis wolfii
Eleusine indica, 1907
Ellisia nyctelea
Elodea bifoliata
Elodea canadensis
Elodea nuttallii
Elyhordeum iowense
Elyhordeum macounii
Elyhordeum montanense
Elymus canadensis
Elymus cinereus
Elymus curvatus [disc. with E. virginicus]
Elymus elongatus, 1961
Elymus elymoides ssp. brevifolius
Elymus elymoides ssp. elymoides
Elymus hispidus, 1968
Elymus hystrix
Elymus junceus, 1973
Elymus lanceolatus ssp. albicans
Elymus lanceolatus ssp. lanceolatus
Elymus macgregorii
Elymus repens, 1905
Elymus smithii
Elymus spicatus
Elymus trachycaulus ssp. subsecundus
Elymus trachycaulus ssp. trachycaulus
Elymus villosus
Elymus virginicus
Engelmannia pinnatifida
Epilobium brachycarpum
Epilobium ciliatum
Epilobium coloratum
Epilobium leptophyllum
Equisetum arvense
Equisetum fluviatile
Equisetum hyemale v. affine
Equisetum laevigatum
Equisetum x ferrissii
Eragrostis barrelieri, 1983
Eragrostis capillaris
Eragrostis cilianensis, 1874
Eragrostis curvula, 1984
Eragrostis hypnoides
Eragrostis minor, 1969
Eragrostis pectinacea
Eragrostis pilosa v. perplexa
Eragrostis reptans
Eragrostis secundiflora ssp. oxylepis
Eragrostis spectabilis
Eragrostis trichodes
Erechtites hieraciifolius
Eremogone hookeri
Eremopyrum triticeum, 1995
Ericameria nauseosa v. graveolens
Ericameria nauseosa v. nauseosa
Ericameria nauseosa v. oreophila
Ericameria parryi v. howardii
Erigeron annuus
Erigeron bellidiastrum
Erigeron caespitosus
Erigeron canus
Erigeron divergens
Erigeron flagellaris
Erigeron lonchophyllus
Erigeron ochroleucus var. scribneri
Erigeron philadelphicus
Erigeron pumilis
Erigeron strigosus
Erigeron subtrinervis
Erigeron vetensis
Eriochloa contracta
Eriochloa villosa, 1989
Eriogonum alatum
Eriogonum annuum
Eriogonum brevicaule
Eriogonum cernuum
Eriogonum effusum
Eriogonum flavum
Eriogonum gordonii
Eriogonum pauciflorum
Eriogonum x nebraskense
Eriophorum angustifolium
Eriophorum gracile
Erodium cicutarium, 1914
Eruca vesicaria ssp. sativa, 1910
Erucastrum gallicum
Eryngium yuccifolium
Erysimum asperum
Erysimum cheiranthoides
Erysimum inconspicuum
Erysimum repandum, 1897
Erythronium albidum
Erythronium mesochoreum
Eschscholzia californica, 1980s
Euclidium syriacum, 1991
Euonymus atropurpurea
Euonymus europaea
Euonymus fortunei
Eupatorium altissimum
Eupatorium maculatum ssp. bruneri
Eupatorium perfoliatum
Eupatorium purpureum v. holzingeri
Eupatorium purpureum v. purpureum
Eupatorium serotinum
Euphorbia corollata
Euphorbia cyathophora
Euphorbia cyparissias, 1878
Euphorbia davidii
Euphorbia dentata
Euphorbia esula v. esula, 1929
Euphorbia esula v. uralensis, 1980
Euphorbia fendleri
Euphorbia geyeri
Euphorbia glyptosperma
Euphorbia hexagona
Euphorbia maculata
Euphorbia marginata
Euphorbia missurica v. missurica
Euphorbia missurica v. petaloidea
Euphorbia nutans
Euphorbia prostrata
Euphorbia robusta
Euphorbia serpens
Euphorbia serpyllifolia
Euphorbia spathulata
Euphorbia stictospora
Eustoma grandiflorum
Euthamia gymnospermoides
Euthamia occidentalis
Evax prolifera
Evolvulus nuttallianus

Return to top

F

Fagopyrum esculentum
Falcaria vulgaris, 1946
Festuca rubra
Festuca saximontana
Festuca subverticillata
Festuca trachyphylla
Filago arvensis, 1995
Fimbristylis autumnalis
Fimbristylis puberula v. interior
Fimbristylis puberula v. puberula
Fimbristylis vahlii
Foeniculum vulgare, 1892
Fragaria vesca ssp. americana
Fragaria virginiana ssp. glauca
Fragaria virginiana ssp. virginiana
Fraxinus americana
Fraxinus pennsylvanica
Fritillaria atropurpurea
Froelichia floridana
Froelichia gracilis
Fuirena simplex v. aristulata
Fumaria officinalis ssp. wirtgenii, 1980s
Fumaria vaillantii, 1995

Return to top

G

Gaillardia pulchella
Galearis spectabilis
Galega officinalis, 1935
Galeopsis bifida, 1952
Galinsoga parviflora, 1942
Galinsoga quadriradiata, 1927
Galium aparine
Galium boreale
Galium circaezans v. hypomalacum
Galium concinnum
Galium obtusum
Galium tinctorium
Galium trifidum
Galium triflorum
Galium verum, 1974
Gaura coccinea
Gaura longiflora
Gaura neomexicana ssp. coloradoensis
Gaura parviflora
Gentiana andrewsii v. dakotica
Gentiana flavida
Gentiana puberulenta
Geranium carolinianum
Geranium maculatum
Geranium pusillum, 1891
Geranium viscosissimum
Geum aleppicum
Geum canadense
Geum laciniatum v. trichocarpum
Geum vernum
Gilia pinnatifida
Glaux maritima
Glechoma hederacea, 1889
Gleditsia triacanthos
Glyceria borealis
Glyceria grandis
Glyceria striata
Glycine max
Glycyrrhiza lepidota
Gnaphalium jaliscense, 1968
Gnaphalium obtusifolium
Gnaphalium palustre
Gnaphalium purpureum
Gnaphalium stramineum, 1983
Goodyera oblongifolia
Gratiola neglecta
Grindelia ciliata, 1934
Grindelia squarrosa v. quasiperennis
Grindelia squarrosa v. serrulata
Grindelia squarrosa v. squarrosa
Gutierrezia dracunculoides
Gutierrezia sarothrae
Gymnocladus dioica
Gypsophila paniculata, 1895
Gypsophila scorzonerifolia, 1995

Return to top

H

Hackelia deflexa v. americana
Hackelia floribunda
Hackelia virginiana
Halogeton glomeratus, 1995
Hedeoma drummondii
Hedeoma hispida
Hedeoma pulegioides
Hedera helix
Helenium autumnale
Helianthemum bicknellii
Helianthus annuus
Helianthus grosseserratus
Helianthus hirsutus
Helianthus maximiliani
Helianthus mollis
Helianthus nuttallii
Helianthus pauciflorus ssp. pauciflorus
Helianthus pauciflorus ssp. subrhomboideus
Helianthus petiolaris
Helianthus tuberosus
Heliopsis helianthoides v. occidentalis
Heliotropium curassavicum v. curassavicum
Heliotropium curassavicum v. obovatum
Hemerocallis fulva
Heracleum lanatum
Hesperis matronalis, 1887
Heteranthera limosa
Heteranthera multiflora
Heterotheca latifolia, 1988
Heterotheca stenophylla v. angustifolia
Heterotheca stenophylla v. stenophylla
Heterotheca villosa v. ballardii
Heterotheca villosa v. nana
Heterotheca villosa v. villosa
Heuchera richardsonii
Hibiscus laevis
Hibiscus trionum, 1873
Hieracium kalmii v. canadense
Hieracium longipilum
Hieracium umbellatum
Hippuris vulgaris
Holosteum umbellatum, 1971
Hordeum jubatum
Hordeum murinum, 2005
Hordeum pusillum
Hordeum vulgare
Houstonia nigricans
Houstonia purpurea v. calycosa
Houstonia pusilla
Humulus japonicus, 1959
Humulus lupulus v. lupuloides
Humulus lupulus v. neomexicana
Humulus lupulus v. pubescens
Hydrophyllum appendiculatum
Hydrophyllum virginianum
Hymenopappus filifolius v. polycephalus
Hymenopappus scabiosaeus v. corymbosus
Hymenopappus tenuifolius
Hymenoxys richardsonii
Hyoscyamus niger, 1991
Hypericum majus
Hypericum mutilum
Hypericum perforatum, 1885
Hypericum punctatum
Hypericum pyramidatum
Hypericum sphaerocarpum
Hypoxis hirsuta

Return to top

I

Impatiens capensis
Impatiens pallida
Ipomoea hederacea v. hederacea, 1877
Ipomoea hederacea v. integriuscula, 2001
Ipomoea leptophylla
Ipomoea pandurata
Ipomoea purpurea
Ipomopsis congesta ssp. congesta
Ipomopsis congesta ssp. pseudotypica
Ipomopsis longiflora
Ipomopsis rubra
Ipomopsis spicata
Iris germanica group
Iris missouriensis
Iris pseudacorus, 1968
Iris versicolor
Iris virginica v. shrevei
Isoetes melanopoda
Iva annua
Iva axillaris v. axillaris
Iva axillaris v. robustior
Iva xanthiifolia

Return to top

J

Juglans nigra
Juncus acuminatus
Juncus alpinoarticulatus
Juncus arcticus v. balticus
Juncus articulatus
Juncus brachyphyllus
Juncus bufonius
Juncus canadensis
Juncus compressus, 1989
Juncus dudleyi
Juncus effusus
Juncus interior
Juncus longistylis
Juncus marginatus
Juncus nodosus
Juncus scirpoides
Juncus tenuis
Juncus torreyi
Juniperus communis v. depressa
Juniperus horizontalis
Juniperus scopulorum
Juniperus virginiana
Justicia americana, 2003

Return to top

K

Kochia scoparia, 1905
Koeleria macrantha
Krascheninnikovia lanata
Krigia caespitosa
Kummerowia stipulacea, 1969

Return to top

L

Lactuca canadensis
Lactuca floridana
Lactuca ludoviciana
Lactuca pulchella
Lactuca saligna, 1971
Lactuca seriola v. integrata
Lactuca serriola v. serriola, 1889
Lamium amplexicaule, 1878
Lamium purpureum, 1974
Laportea canadensis
Lappula cenchrusoides
Lappula redowskii v. cupulata
Lappula redowskii v. redowskii
Lappula squarrosa
Lathyrus latifolius, 1895
Lathyrus ochroleucus
Lathyrus palustris
Lathyrus polymorphus v. incanus
Lathyrus polymorphus v. polymorphus
Lathyrus tuberosus, 1967
Lechea mucronata
Lechea stricta
Lechea tenuifolia
Leersia oryzoides
Leersia virginica
Lemna gibba 
Lemna minor
Lemna minuta
Lemna perpusilla
Lemna trisulca
Lemna valdiviana
Leonurus cardiaca, 1892
Leonurus marrubiastrum, 1974
Leonurus sibiricus, 1966
Lepidium appelianum, 1927
Lepidium campestre, 1974
Lepidium chalepensis, 1940
Lepidium densiflorum
Lepidium draba, 1908
Lepidium latifolium, 1961
Lepidium oblongum
Lepidium perfoliatum, 1933
Lepidium sativum, 1893
Lepidium virginicum
Leptochloa fusca ssp. fascicularis
Leptodactylon caespitosum
Lespedeza capitata
Lespedeza cuneata, 1974
Lespedeza violacea
Leucanthemum vulgare, 1887
Leucocrinum montanum
Leucopoa kingii
Leucospora multifida
Liatris aspera
Liatris lancifolia
Liatris ligulistylis
Liatris punctata
Liatris pycnostachya
Liatris squarrosa v. glabrata
Liatris squarrosa v. hirsuta
Ligustrum obtusifolium, 1991
Ligustrum vulgare, 1983
Lilium canadense ssp. michiganense
Lilium philadelphicum
Limosella aquatica
Linaria dalmatica, 1971
Linaria vulgaris, 1883
Lindernia dubia
Linum berlandieri
Linum compactum
Linum grandiflorum
Linum perenne ssp. lewisii
Linum perenne ssp. perenne
Linum puberulum
Linum rigidum v. rigidum
Linum rigidum v. simulans
Linum sulcatum
Linum usitatissimum
Liparis loeselii
Lipocarpha aristulata
Lipocarpha drummondii
Lipocarpha micrantha
Lippia cuneifolia
Lippia lanceolata
Lithophragma parviflorum
Lithospermum arvense
Lithospermum canescens
Lithospermum caroliniense
Lithospermum incisum
Lobelia cardinalis
Lobelia inflata
Lobelia siphilitica
Lobelia spicata
Lobularia maritima
Loeflingia squarrosa var. texana, 1889
Lolium arundinaceum, 1973
Lolium perenne ssp. italicum, 1886
Lolium perenne v. perenne, 1891
Lolium pratense, 1886
Lomatium foeniculaceum v. daucifolium
Lomatium foeniculaceum v. foeniculaceum
Lomatium nuttallii
Lomatium orientale
Lonicera dioica v. glaucescens
Lonicera japonica, 1980s
Lonicera maackii, 1995
Lonicera morrowii, 1998
Lonicera tatarica, 1880s
Lonicera x bella
Lonicera x xylosteoides
Lonicera xylosteum, 1991
Lotus corniculatus, 1974
Lotus purshianus
Lotus tenuis, 1971
Ludwigia alternifolia
Ludwigia palustris
Ludwigia peploides ssp. glabrescens
Ludwigia polycarpa
Lunaria annua
Lupinus argenteus v. argenteus
Lupinus argenteus v. argophyllus
Lupinus plattensis
Lupinus pusillus
Lycium barbarum, ca 1900
Lycopus americanus
Lycopus asper
Lycopus uniflorus
Lycopus virginicus
Lygodesmia juncea
Lysimachia ciliata
Lysimachia hybrida
Lysimachia nummularia, 1996
Lysimachia punctata, 1971
Lysimachia thyrsiflora
Lythrum alatum
Lythrum salicaria, 1972

Return to top

M

Machaeranthera tanacetifolia
Maclura pomifera, 1907; cult. 1870s
Maianthemum canadense v. interius
Malva neglecta, 1889
Malva parviflora, 1902
Malva pusilla, 1889
Malva sylvestris, 1894
Marrubium vulgare, 1898
Marsilea vestita
Matricaria chamomilla
Matricaria inodora, 1905
Matricaria matricarioides, 1974
Matteuccia struthiopteris v. pensylvanica
Medicago lupulina, 1873
Medicago sativa ssp. falcata
Medicago sativa ssp. sativa
Melica nitens
Melilotus albus, 1888
Melilotus officinalis, 1885
Menispermum canadense
Mentha arvensis
Mentha spicata
Mentha x gracilis
Mentha x piperita
Mentzelia albicaulis
Mentzelia decapetala
Mentzelia multiflora
Mentzelia nuda v. stricta
Mentzelia oligosperma
Menyanthes trifoliata
Mertensia lanceolata
Mertensia virginica, 1950
Microsteris gracilis v. humilior
Mimosa quadrivalvis v. nuttallii
Mimulus alatus
Mimulus glabratus  jamesii
Mimulus guttatus
Mimulus ringens
Minuartia michauxii v. texana
Mirabilis albida
Mirabilis glabra
Mirabilis hirsuta
Mirabilis linearis
Mirabilis nyctaginea
Miscanthus sacchariflorus
Mollugo verticillata, 1878
Monarda citriodora
Monarda fistulosa v. menthifolia
Monarda fistulosa v. mollis
Monarda pectinata
Monarda punctata v. occidentalis, 1987
Monolepis nuttalliana
Monotropa hypopithys
Monotropa uniflora
Morus alba, 1920
Morus rubra
Muhlenbergia asperifolia
Muhlenbergia bushii
Muhlenbergia cuspidata
Muhlenbergia filiformis
Muhlenbergia frondosa
Muhlenbergia glomerata
Muhlenbergia mexicana
Muhlenbergia minutissima
Muhlenbergia pungens
Muhlenbergia racemosa
Muhlenbergia richardsonis
Muhlenbergia schreberi
Muhlenbergia sobolifera
Muhlenbergia sylvatica
Muhlenbergia tenuiflora
Munroa squarrosa
Muscari botryoides
Musineon divaricatum
Musineon tenuifolium
Myosotis laxa
Myosotis stricta, 1995
Myosotis verna
Myosoton aquaticum, 1974
Myosurus minimus
Myriophyllum pinnatum
Myriophyllum sibiricum
Myriophyllum spicatum, 1980
Myriophyllum verticillatum

Return to top

N

Najas flexilis
Najas guadalupensis
Najas marina
Nasturtium microphyllum, 1991
Nasturtium officinale, 1875
Navarretia intertexta v. propinqua
Nelumbo lutea
Nepeta cataria, 1873
Nicandra physalodes
Nothocalais cuspidata
Nothoscordum bivalve
Nuphar variegata
Nuttallanthus texanus
Nymphaea odorata ssp. odorata
Nymphaea odorata ssp. tuberosa

Return to top

O

Oenanthe sarmentosa, 1998
Oenothera albicaulis
Oenothera biennis v. biennis
Oenothera biennis v. canescens
Oenothera biennis v. strigosa
Oenothera caespitosa v. caespitosa
Oenothera caespitosa v. montana
Oenothera canescens
Oenothera coronopifolia
Oenothera grandis
Oenothera laciniata
Oenothera latifolia
Oenothera macrocarpa ssp. fremontii
Oenothera macrocarpa ssp. macrocarpa
Oenothera nuttallii
Oenothera perennis
Oenothera rhombipetala
Oenothera speciosa, 1915
Onoclea sensibilis
Onopordum acanthium, 1960s
Onosmodium molle v. occidentale
Oönopsis multicaulis
Ophioglossum engelmannii
Ophioglossum pusillum
Opuntia fragilis
Opuntia macrorhiza
Opuntia polyacantha
Ornithogalum umbellatum, 1951
Orobanche fasciculata
Orobanche ludoviciana
Orobanche uniflora
Orobanche riparia
Orthilia secunda
Orthocarpus luteus
Oryzopsis micrantha
Oryzopsis racemosa
Osmorhiza claytonii
Osmorhiza longistylis
Ostrya virginiana
Oxalis dillenii
Oxalis stricta
Oxalis violacea
Oxytropis lambertii
Oxytropis multiceps
Oxytropis sericea

Return to top

P

Palafoxia sphacelata
Panax quinquefolius
Panicum acuminatum
Panicum capillare
Panicum depauperatum
Panicum dichotomiflorum
Panicum latifolium
Panicum leibergii
Panicum linearifolium
Panicum miliaceum
Panicum oligosanthes v. scribnerianum
Panicum ovale v. praecocius
Panicum virgatum
Panicum wilcoxianum
Papaver rhoeas, 1980s
Parietaria pensylvanica
Paronychia canadensis
Paronychia jamesii v. depressa
Paronychia jamesii v. jamesii
Paronychia sessiliflora
Parthenocissus quinquefolia
Parthenocissus tricuspidata, 1974
Parthenocissus vitacea
Paspalum setaceum v. stramineum
Pastinaca sativa, 1890
Pectis angustifolia
Pedicularis canadensis
Pedicularis crenulata
Pedicularis lanceolata
Pediomelum argophyllum
Pediomelum cuspidatum
Pediomelum digitatum
Pediomelum esculentum
Pediomelum hypogaeum
Pediomelum linearifolium
Pellaea atropurpurea
Pellaea glabella
Penstemon albidus
Penstemon ambiguus
Penstemon angustifolius v. angustifolius
Penstemon angustifolius v. caudatus
Penstemon buckleyi
Penstemon cobaea
Penstemon digitalis
Penstemon eriantherus
Penstemon glaber
Penstemon gracilis
Penstemon grandiflorus
Penstemon haydenii
Penstemon tubaeflorus
Penthorum sedoides
Perilla frutescens, 1974
Petunia x hybrida
Phacelia hastata
Phalaris arundinacea
Phalaris canariensis, 1877
Phemeranthus calycinus
Phemeranthus parviflorus
Phemeranthus rugospermus
Philadelphus coronarius
Philadelphus pubescens
Phleum pratense, 1873
Phlox alyssifolia
Phlox andicola
Phlox divaricata ssp. laphamii
Phlox hoodii
Phlox muscoides
Phlox paniculata, 1974
Phlox pilosa ssp. fulgida
Phragmites australis
Phryma leptostachya
Physalis hederifolia v. comata
Physalis heterophylla
Physalis hispida
Physalis longifolia
Physalis missouriensis
Physalis pumila
Physalis virginiana
Physaria arenosa ssp. arenosa
Physaria arenosa ssp. argillosa
Physaria brassicoides
Physaria ludoviciana
Physaria montana
Physaria ovalifolia
Physaria reediana
Physocarpus opulifolius v. intermedius
Physostegia parviflora
Physostegia virginiana ssp. praemorsa
Physostegia virginiana ssp. virginiana
Phytolacca americana
Picradeniopsis oppositifolia
Pilea fontana
Pilea pumila
Pilularia americana
Pinus flexilis
Pinus ponderosa v. scopulorum
Plagiobothrys scouleri v. penicillatus
Plantago aristata
Plantago elongata
Plantago eriopoda
Plantago lanceolata, 1887
Plantago major, 1873
Plantago patagonica v. spinulosa
Plantago patagonica v.patagonica
Plantago rhodosperma
Plantago rugelii
Plantago virginica
Platanthera aquilonis
Platanthera praeclara
Platanus occidentalis
Poa annua, 1953
Poa arida
Poa bulbosa, 1988
Poa chapmaniana
Poa compressa, 1885
Poa fendleriana
Poa glaucifolia
Poa interior
Poa juncifolia
Poa palustris, 1890
Poa pratensis
Poa secunda
Poa sylvestris
Poa trivialis
Podophyllum peltatum
Polanisia dodecandra ssp. dodecandra
Polanisia dodecandra ssp. trachysperma
Polanisia jamesii
Polemonium reptans
Polygala alba
Polygala sanguinea
Polygala senega
Polygala verticillata v. isocycla
Polygala verticillata v. sphenostachya
Polygonatum biflorum
Polygonum achoreum
Polygonum amphibium
Polygonum aviculare ssp. aviculare
Polygonum aviculare ssp. depressum
Polygonum aviculare ssp. neglectum
Polygonum bicorne
Polygonum bungeanum, 2006
Polygonum buxiforme
Polygonum cespitosum v. longisetum, 1967
Polygonum coccineum
Polygonum convolvulus, 1879
Polygonum cuspidatum
Polygonum douglasii
Polygonum erectum
Polygonum hydropiper, 1885
Polygonum hydropiperoides v. hydropiperoides
Polygonum hydropiperoides v. opelousanum
Polygonum lapathifolium
Polygonum minus, 2000
Polygonum orientale, 1898
Polygonum pensylvanicum
Polygonum persicaria, 1885
Polygonum punctatum
Polygonum ramosissimum
Polygonum sagittatum
Polygonum sawatchense ssp. sawatchense
Polygonum scandens
Polygonum tenue
Polygonum virginianum
Polypogon interruptus
Polypogon monspeliensis, 1907
Polytaenia nuttallii
Pomaria jamesii
Populus alba
Populus angustifolia
Populus deltoides v. occidentalis
Populus tremuloides
Populus x acuminata
Populus x smithii
Portulaca grandiflora
Portulaca oleracea, 1893
Portulaca pilosa
Potamogeton amplifolius
Potamogeton crispus, 1965
Potamogeton diversifolius
Potamogeton filiformis v. alpinus
Potamogeton filiformis v. occidentalis
Potamogeton foliosus
Potamogeton friesii
Potamogeton gramineus
Potamogeton illinoensis
Potamogeton natans
Potamogeton nodosus
Potamogeton pectinatus
Potamogeton praelongus
Potamogeton pusillus
Potamogeton richardsonii
Potamogeton strictifolius
Potamogeton zosteriformis
Potentilla anserina
Potentilla argentea, 1986
Potentilla bipinnatifida
Potentilla hippiana v. effusa
Potentilla indica, 1974
Potentilla norvegica
Potentilla paradoxa
Potentilla pensylvanica
Potentilla plattensis
Potentilla recta, 1926
Potentilla rivalis
Potentilla simplex
Prenanthes aspera
Prenanthes racemosa ssp. multiflora
Proboscidea louisianica
Prosartes trachycarpa
Prunella vulgaris v. lanceolata
Prunella vulgaris v. vulgaris, 1961
Prunus americana
Prunus angustifolia
Prunus cerasus, 1992
Prunus hortulana
Prunus pumila v. besseyi
Prunus serotina
Prunus tomentosa, 1998
Prunus virginiana
Psoralidium lanceolatum
Psoralidium tenuiflorum
Ptelea trifoliolata
Pterospora andromedea
Puccinellia distans, 1983
Puccinellia nuttalliana
Pueraria montana v. lobata, 1992
Purshia tridentata
Pycnanthemum tenuifolium
Pycnanthemum verticillatum v. pilosum
Pycnanthemum virginianum
Pyrola chlorantha
Pyrola elliptica
Pyrrhopappus carolinianus
Pyrrhopappus grandiflorus
Pyrus ioensis

Return to top

Q

Quercus alba
Quercus macrocarpa
Quercus marilandica
Quercus muehlenbergii
Quercus palustris
Quercus rubra
Quercus velutina
Quercus x bushii
Quincula lobata

Return to top

R

Ranunculus abortivus
Ranunculus cymbalaria
Ranunculus fascicularis
Ranunculus flabellaris
Ranunculus glaberrimus v. ellipticus
Ranunculus hispidus v. caricetorum
Ranunculus longirostris
Ranunculus macounii
Ranunculus pensylvanicus
Ranunculus recurvatus
Ranunculus repens, 1983
Ranunculus rhomboideus
Ranunculus sceleratus v. multifidus
Ranunculus sceleratus v. sceleratus
Ranunculus subrigidus
Ranunculus testiculatus, 1971
Raphanus sativus
Ratibida columnifera
Ratibida pinnata
Ratibida tagetes
Rayjacksonia annua
Redfieldia flexuosa
Reseda lutea, 1974
Rhamnus cathartica, 1890s
Rhamnus davurica. 1987
Rhamnus frangula, 1997
Rhamnus lanceolata v. glabrata
Rhus aromatica
Rhus copallina v. latifolia
Rhus glabra
Rhus typhina, 2003
Rhynchospora capitellata
Ribes americanum
Ribes cereum v. inebrians
Ribes hirtellum
Ribes missouriense
Ribes odoratum
Ribes oxyacanthoides
Robinia hispida, 1990
Robinia pseudoacacia
Rorippa austriaca, 1961
Rorippa curvipes  v. truncata
Rorippa palustris v. fernaldiana
Rorippa palustris v. hispida
Rorippa sessiliflora
Rorippa sinuata
Rorippa sylvestris, 1991
Rorippa tenerrima
Rosa arkansana
Rosa blanda
Rosa canina, 1992
Rosa carolina
Rosa multiflora, 1974
Rosa rubiginosa
Rosa setigera v. tomentosa
Rosa woodsii
Rotala ramosior v. interior
Rubus allegheniensis
Rubus flagellaris
Rubus frondosus
Rubus laudatus
Rubus occidentalis
Rubus pubescens
Rubus rosa
Rudbeckia hirta v. pulcherrima
Rudbeckia laciniata
Rudbeckia triloba
Ruellia humilis
Ruellia strepens
Rumex acetosella, 1885
Rumex altissimus
Rumex britannica
Rumex crispus, 1889
Rumex fueginus
Rumex obtusifolius, 1892
Rumex patientia ssp. orientalis, 1890
Rumex patientia ssp. patientia, 1947
Rumex stenophyllus, 1935
Rumex triangulivalvis
Rumex venosus
Rumex verticillatus
Rumex x alexidis
Ruppia maritima
Ruppia occidentalis

Return to top

S

Sagittaria brevirostra
Sagittaria calycina
Sagittaria cuneata
Sagittaria graminea
Sagittaria latifolia
Sagittaria longiloba
Sagittaria rigida
Salicornia rubra
Salix amygdaloides
Salix bebbiana
Salix eriocephala v. eriocephala
Salix eriocephala v. famelica
Salix exigua ssp. interior
Salix fragilis
Salix humilis
Salix nigra
Salix petiolaris
Salix x pendulina
Salix x rubens
Salix x sepulcralis v. chrysocoma
Salix x sepulcralis v. sepulcralis
Salsola collina, 1977
Salsola tragus, 1889
Salvia azurea v. grandiflora
Salvia nemorosa, 1968
Salvia reflexa
Sambucus canadensis
Sanguinaria canadensis
Sanguisorba minor
Sanicula canadensis
Sanicula marilandica
Sanicula odorata
Saponaria officinalis, 1890
Sarcobatus vermiculatus
Schedonnardus paniculatus
Schizachne purpurascens
Schizachyrium scoparium ssp. neomexicanum
Schizachyrium scoparium ssp. scoparium
Schoenoplectus acutus
Schoenoplectus acutus x tabernaemontani
Schoenoplectus hallii
Schoenoplectus heterochaetus
Schoenoplectus pungens
Schoenoplectus saximontanus
Schoenoplectus tabernaemontani
Scilla sibirica
Scirpus atrovirens
Scirpus cyperinus
Scirpus microcarpus
Scirpus pallidus
Scirpus pendulus
Scleranthus annuus, 1995
Scleria triglomerata
Sclerochloa dura, 1982
Scolochloa festucacea
Scorzonera laciniata
Scrophularia lanceolata
Scrophularia marilandica
Scutellaria brittonii
Scutellaria galericulata
Scutellaria lateriflora
Scutellaria parvula v. missouriensis
Scutellaria parvula v. parvula
Secale cereale
Securigera varia, 1960s
Sedum lanceolatum
Selaginella rupestris
Senecio canus v. canus
Senecio canus. v. purshianus
Senecio glabellus
Senecio integerrimus v. integerrimus
Senecio integerrimus v. scribneri
Senecio plattensis
Senecio pseudaureus v. semicordatus
Senecio riddellii
Senecio spartioides
Senecio tridenticulatus
Senecio vulgaris, 1887
Senna marilandica
Senna obtusifolia, 1990
Setaria faberi, 1940
Setaria italica, 1876
Setaria pumila, 1886
Setaria verticillata, 1884
Setaria viridis, 1873
Shepherdia argentea
Shinnersoseris rostrata
Sibara virginica, 1992
Sicyos angulatus
Sida spinosa, 1889
Sidalcea neomexicana
Sideritis montana
Silene antirrhina
Silene dichotoma, 1908
Silene drummondii
Silene latifolia, 1891
Silene menziesii
Silene noctiflora, 1885
Silene stellata v. scabrella
Silene vulgaris, 1891
Silphium integrifolium v. laeve
Silphium laciniatum
Silphium perfoliatum
Sinapis alba, 1891
Sinapis arvensis, 1927
Sisymbrium altissimum, 1898
Sisymbrium loeselii, 1910
Sisymbrium officinale, 1886
Sisyrinchium campestre
Sisyrinchium montanum
Sium suave
Smilacina racemosa
Smilacina stellata
Smilax ecirrata
Smilax hispida
Smilax lasioneura
Solanum carolinense
Solanum dulcamara, 1895
Solanum elaeagnifolium, 1994
Solanum interius
Solanum physalifolium v. nitidibaccatum, 1992
Solanum ptychanthum
Solanum rostratum
Solanum triflorum
Solidago canadensis
Solidago flexicaulis
Solidago gigantea
Solidago missouriensis
Solidago mollis
Solidago nemoralis ssp, decemflora
Solidago petiolaris
Solidago rigida
Solidago speciosa v. rigidiuscula
Solidago ulmifolia
Sonchus arvensis v. glabrescens, 1971
Sonchus asper, 1888
Sonchus oleraceus, 1908
Sophora nuttalliana
Sorghastrum nutans
Sorghum bicolor
Sorghum bicolor ssp. drummondii
Sorghum halepense
Sparganium emersum
Sparganium eurycarpum
Spartina gracilis
Spartina pectinata
Spergularia salina, 1992
Spermolepis inermis
Sphaeralcea angustifolia v. cuspidata, 1995
Sphaeralcea coccinea
Sphenopholis obtusata v. major
Sphenopholis obtusata v. obtusata
Spiranthes cernua
Spiranthes diluvialis
Spiranthes lacera
Spiranthes magnicamporum
Spiranthes romanzoffiana
Spiranthes vernalis
Spirodela polyrrhiza
Sporobolus airoides
Sporobolus compositus
Sporobolus cryptandrus
Sporobolus heterolepis
Sporobolus neglectus
Sporobolus pyramidatus
Sporobolus texanus
Sporobolus vaginiflorus
Stachys hispida
Stachys pilosa v. arenicola
Stachys pilosa v. pilosa
Stachys tenuifolia
Stanleya pinnata
Staphylea trifolia
Stellaria longifolia
Stellaria media, 1888
Stellaria pallida, 1974
Stenosiphon linifolius
Stenotus armerioides
Stephanomeria runcinata
Stipa comata
Stipa hymenoides
Stipa hymenoides x viridula
Stipa robusta
Stipa spartea
Stipa viridula
Strophostyles helvola
Strophostyles leiosperma
Suaeda calceoliformis
Suckleya suckleyana
Symphoricarpos albus
Symphoricarpos occidentalis
Symphoricarpos orbiculatus
Syringa vulgaris

Return to top

T

Tamarix chinensis sens. lat. 1975
Tamarix parviflora
Tanacetum balsamita
Tanacetum vulgare
Taraxacum officinale, 1885
Tephrosia virginiana
Tetraneuris acaulis
Tetraneuris scaposa v. linearis
Teucrium canadense (intermediates)
Teucrium canadense v. canadense
Teucrium canadense v. occidentale
Thalictrum dasycarpum
Thalictrum venulosum
Thelesperma filifolium v. intermedium
Thelesperma megapotamicum
Thelypodium integrifolium
Thelypteris palustris v. pubescens
Thermopsis rhombifolia
Thlaspi arvense, 1890
Thymelaea passerina, 1950
Tilia americana
Torilis arvensis, 1992
Townsendia exscapa
Townsendia grandiflora
Townsendia hookeri
Toxicodendron radicans v. negundo
Toxicodendron radicans v. rydbergii
Tradescantia bracteata
Tradescantia occidentalis
Tradescantia ohiensis
Tragia ramosa
Tragopogon dubius, 1910
Tragopogon porrifolius, 1892
Tragopogon pratensis, 1891
Triadenum fraseri
Tribulus terrestris, 1896
Trichostema brachiatum
Tridens flavus
Trifolium campestre, 1974
Trifolium fragiferum, 1963
Trifolium hybridum, 1888
Trifolium incarnatum
Trifolium pratense, 1892
Trifolium reflexum
Trifolium repens, 1873
Triglochin maritima
Triglochin palustris
Trillium nivale
Triodanis biflora
Triodanis holzingeri
Triodanis leptocarpa
Triodanis perfoliata
Triosteum perfoliatum v. aurantiacum
Triosteum perfoliatum v. perfoliatum
Triphora trianthophora
Triplasis purpurea
Tripsacum dactyloides
Tripterocalyx micranthus
Triticum aestivum
Typha angustifolia
Typha domingensis
Typha latifolia
Typha x glauca

Return to top

U

Ulmus americana
Ulmus pumila, 1890s
Ulmus rubra
Ulmus thomasii
Ulmus x notha
Urtica dioica ssp. gracilis
Utricularia macrorhiza
Utricularia minor

Return to top

V

Vaccaria hispanica, 1892
Vallisneria americana
Verbascum blattaria, 1934
Verbascum thapsus, 1885
Verbena bipinnatifida
Verbena bracteata
Verbena canadensis
Verbena hastata
Verbena simplex
Verbena stricta
Verbena urticifolia
Verbesina alternifolia
Verbesina encelioides v. exauriculata
Vernonia baldwinii ssp. interior
Vernonia fasciculata ssp. corymbosa
Vernonia fasciculata ssp. fasciculata
Veronica  x lackschewitzii
Veronica americana
Veronica anagallis-aquatica, 1934
Veronica arvensis, 1974
Veronica biloba, 1989
Veronica catenata
Veronica hederifolia, 1970
Veronica peregrina v. peregrina
Veronica peregrina v. xalapensis
Veronica persica, 1878
Veronica polita, 1966
Veronicastrum virginicum
Viburnum lentago
Viburnum opulus
Vicia americana v. americana
Vicia americana v. minor
Vicia villosa v. glabrescens
Vicia villosa v. villosa
Vinca minor
Viola adunca
Viola arvensis, 1909
Viola bicolor
Viola canadensis v. rugulosa
Viola lanceolata
Viola missouriensis
Viola nephrophylla 
Viola nuttallii
Viola odorata, 1988
Viola palmata
Viola pedata
Viola pedatifida
Viola pedatifida x sororia
Viola pubescens v. eriocarpa
Viola sororia  
Viola striata, 1974
Viola tricolor, 1915
Viola vallicola
Vitis aestivalis
Vitis cinerea
Vitis riparia
Vitis vulpina
Vulpia octoflora

Return to top

W

Wolffia borealis
Wolffia brasiliensis
Wolffia columbiana
Woodsia obtusa
Woodsia oregana ssp. cathcartiana

Return to top

X

Xanthisma grindelioides
Xanthisma spinulosum v. glaberrimum
Xanthisma spinulosum v. spinulosum
Xanthium spinosum, 1934
Xanthium strumarium v. canadense
Xyris torta

Return to top

Y

Yucca filamentosa Yucca glauca

Return to top

Z

Zannichellia palustris
Zanthoxylum americanum
Zea mays
Zigadenus elegans
Zigadenus venenosus v. gramineus
Zizania palustris v. interior
Zizia aurea
Zosterella dubia