Nomenclature follows Nelson & Hartman, 1994.
To find a species, use the Find function of your browser to find the genus of interest, or select from the alphabetical list below.
[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
Abies
Abronia
Abutilon
Acer
Achillea
Aconitum
Actaea
Adenocaulon
Adiantum
Adoxa
Aegilops
Aegopodium
Agalinis
Agastache
Agoseris
Agrimonia
Agropyron
Agrostemma
Agrostis
Aira
Alcea
Aletes
Alisma
Allium
Alnus
Alopecurus
Alyssum
Amaranthus
Ambrosia
Amelanchier
Amerorchis
Ammannia
Amorpha
Amsinckia
Anaphalis
Anchusa
Andropogon
Androsace
Androstephium
Anemone
Angelica
Antennaria
Anthemis
Apera
Apocynum
Aquilegia
Arabis
Aralia
Arceuthobium
Arctium
Arctostaphylos
Arenaria
Argemone
Argyrochosma
Aristida
Armoracia
Arnica
Arrhenatherum
Artemisia
Asclepias
Asparagus
Asperugo
Aspidotis
Asplenium
Aster
Astragalus
Athyrium
Atriplex
Avena
B
Bacopa
Bahia
Balsamorhiza
Barbarea
Bassia
Beckmannia
Berberis
Berteroa
Berula
Besseya
Betula
Bidens
Botrychium
Bouteloua
Boykinia
Brassica
Braya
Brickellia
Bromus
Buchloe
Bupleurum
C
Calamagrostis
Calamovilfa
Callirhoe
Callitriche
Calochortus
Calylophus
Calypso
Calystegia
Camassia
Camelina
Camissonia
Campanula
Cannabis
Capsella
Caragana
Cardamine
Cardaria
Carduus
Carex
Carum
Castilleja
Catabrosa
Caulanthus
Ceanothus
Celastrus
Celtis
Cenchrus
Centaurea
Centaurium
Centunculus
Cerastium
Ceratophyllum
Cercocarpus
Chaenactis
Chaetopappa
Chamaechaenactis
Chamaerhodos
Cheilanthes
Chelidonium
Chenopodium
Chimaphila
Chionophila
Chloris
Chorispora
Chrysanthemum
Chrysothamnus
Cicer
Cichorium
Cicuta
Cinna
Circaea
Cirsium
Cistanthe
Clarkia
Claytonia
Clematis
Cleome
Coeloglossum
Collinsia
Collomia
Comandra
Conimitella
Conioselinum
Conium
Conringia
Convolvulus
Conyza
Corallorrhiza
Cordylanthus
Coreopsis
Corispermum
Cornus
Coronilla
Corydalis
Corylus
Coryphantha
Cosmos
Crassula
Crataegus
Crepis
Croton
Crypsis
Cryptantha
Cryptogramma
Cucurbita
Cuscuta
Cycloloma
Cymopterus
Cynoglossum
Cyperus
Cypripedium
Cystopteris
D
Dactylis
Dalea
Danthonia
Datura
Daucus
Delphinium
Deschampsia
Descurainia
Dianthus
Dicentra
Dichanthelium
Digitaria
Diphasiastrum
Diplachne
Dipsacus
Disporum
Distichlis
Dodecatheon
Douglasia
Downingia
Draba
Dracocephalum
Drosera
Dryas
Dryopteris
Dugaldia
Dyssodia
E
Echinacea
Echinocereus
Echinochloa
Echinocystis
Echium
Elaeagnus
Elatine
Eleocharis
Ellisia
Elodea
Elymus
Ephedra
Epilobium
Epipactis
Equisetum
Eragrostis
Eriastrum
Ericameria
Erigeron
Eriogonum
Eriophorum
Eriophyllum
Eritrichum
Erodium
Erucastrum
Erysimum
Erythronium
Eschscholzia
Euclidium
Eupatorium
Euphorbia
Eustoma
Euthamia
Evax
Evolvulus
F
Fagopyrum
Falcaria
Festuca
Floerkea
Forsellesia
Fragaria
Frasera
Fraxinus
Fritillaria
Froelichia
Fumaria
G
Gaillardia
Galeopsis
Galinsoga
Galium
Gaultheria
Gaura
Gayophytum
Gentiana
Gentianella
Gentianopsis
Geranium
Geum
Gilia
Glandularia
Glaux
Glecoma
Gleditsia
Glyceria
Glycyrrhiza
Gnaphalium
Goodyera
Gratiola
Grayia
Grindelia
Gutierrezia
Gymnocarpium
Gymnosteris
Gypsophila
H
Hackelia
Halenia
Halimolobos
Halogeton
Haplopappus
Harbouria
Hedeoma
Hedysarum
Helenium
Helianthella
Helianthemum
Helianthus
Helictotrichon
Heliotropium
Hemicarpha
Heracleum
Hesperis
Hesperochiron
Heterocodon
Heterotheca
Heuchera
Hieracium
Hierochloe
Hilaria
Hippuris
Holodiscus
Hordeum
Horkelia
Hulsea
Humulus
Huperzia
Hutchinsia
Hydrophyllum
Hymenopappus
Hymenoxys
Hyoscyamus
Hypericum
I
Iliamna
Ipomoea
Ipomopsis
Iris
Isatis
Isoetes
Iva
Ivesia
K
Kalmia
Kelloggia
Kelseya
Knautia
Kobresia
Kochia
Koeleria
Koenigia
Krascheninnikovia
L
Lactuca
Lallemantia
Lamium
Lappula
Larix
Lathyrus
Lavatera
Lechea
Ledum
Leersia
Lemna
Lepidium
Leptodactylon
Lesquerella
Leucocrinum
Leucopoa
Levisticum
Lewisia
Liatris
Ligusticum
Lilium
Limosella
Linanthus
Linaria
Linnaea
Linum
Listera
Lithophragma
Lithospermum
Lloydia
Lobelia
Lobularia
Loeflingia
Logfia
Lolium
Lomatium
Lomatogonium
Lonicera
Lotus
Lupinus
Luzula
Lycium
Lycopodium
Lycopus
Lygodesmia
Lysichiton
Lysimachia
Lythrum
M
Machaeranthera
Madia
Mahonia
Maianthemum
Malacothrix
Malva
Marrubium
Marsilea
Matricaria
Medicago
Melica
Melilotus
Mentha
Mentzelia
Menyanthes
Menziesia
Mertensia
Microseris
Microsteris
Mimulus
Minuartia
Mirabilis
Mitella
Moehringia
Mollugo
Monarda
Monardella
Moneses
Monolepis
Monotropa
Monroa
Montia
Montiastrum
Morus
Muhlenbergia
Musineon
Myosotis
Myosurus
Myriophyllum
N
Najas
Nama
Navarretia
Nemophila
Nepeta
Nicotiana
Nothocalais
Nuphar
O
Oenothera
Onobrychis
Onopordum
Onosmodium
Oonopsis
Ophioglossum
Opuntia
Orobanche
Orogenia
Orthilia
Orthocarpus
Oryzopsis
Osmorhiza
Ostrya
Oxalis
Oxypolis
Oxyria
Oxytheca
Oxytropis
P
Paeonia
Palafoxia
Panicum
Papaver
Parietaria
Parnassia
Paronychia
Parrya
Parthenium
Parthenocissus
Pastinaca
Paxistima
Pectis
Pectocarya
Pedicularis
Pediocactus
Pediomelum
Pellaea
Penstemon
Perideridia
Petasites
Petradoria
Petrophyton
Phacelia
Phalaris
Philadelphus
Phippsia
Phleum
Phlox
Phragmites
Phryma
Phyla
Phyllodoce
Physalis
Physaria
Physocarpus
Physostegia
Picea
Picradeniopsis
Pinus
Piperia
Plagiobothrys
Plantago
Platanthera
Platyschkuhria
Poa
Polanisia
Polemonium
Polygala
Polygonatum
Polygonum
Polypodium
Polypogon
Polystichum
Populus
Porterella
Portulaca
Potamogeton
Potentilla
Prenanthes
Primula
Proboscidea
Prunella
Prunus
Pseudostellaria
Pseudotsuga
Psilocarphus
Psoralidium
Pteridium
Pterospora
Puccinellia
Purshia
Pyrola
Pyrrocoma
Pyrus
Q
Quercus
R
Ranunculus
Raphanus
Ratibida
Redfieldia
Reseda
Rhamnus
Rheum
Rhus
Ribes
Robinia
Rorippa
Rosa
Rubus
Rudbeckia
Rumex
Ruppia
S
Sagina
Sagittaria
Salicornia
Salix
Salsola
Salvia
Sambucus
Sanguisorba
Sanicula
Saponaria
Sarcobatus
Saussurea
Saxifraga
Schedonnardus
Schizachne
Schizachyrium
Schoenocrambe
Scirpus
Scolochloa
Scorzonera
Scrophularia
Scutellaria
Secale
Sedum
Selaginella
Senecio
Setaria
Shepherdia
Shinnersoseris
Shoshonea
Sibbaldia
Sidalcea
Silene
Silphium
Sisymbrium
Sisyrinchium
Sium
Smelowskia
Smilax
Solanum
Solidago
Sonchus
Sophora
Sorbus
Sorghastrum
Sorghum
Sparganium
Spartina
Spergula
Spergularia
Sphaeralcea
Sphaeromeria
Sphaerophysa
Sphenopholis
Spiraea
Spiranthes
Spirodela
Sporobolus
Stachys
Stanleya
Stellaria
Stenogonum
Stenosiphon
Stephanomeria
Stipa
Streptanthella
Streptanthus
Streptopus
Suaeda
Subularia
Suckleya
Sullivantia
Swertia
Symphoricarpos
Synthyris
T
Tagetes
Talinum
Tamarix
Tanacetum
Taraxacum
Tetradymia
Teucrium
Thalictrum
Thelesperma
Thelypodiopsis
Thelypodium
Thermopsis
Thlaspi
Tiquilia
Tofieldia
Torreyochloa
Townsendia
Toxicodendron
Tradescantia
Tragopogon
Trautvetteria
Tribulus
Trifolium
Triglochin
Trillium
Triodanis
Tripterocalyx
Trisetum
Triteleia
Triticum
Trollius
Typha
V
Vaccaria
Vaccinium
Valeriana
Veratrum
Verbascum
Verbena
Verbesina
Veronica
Viburnum
Vicia
Viguiera
Viola
Vitis
Vulpia
X
Xanthium
Xerophyllum
Xylorhiza
Z
Zannichellia
Zea
Zigadenus
Zizia
Zuckia
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