Fabaceae
Pea Family
35 genera
184 species
94 subspecies and varieties
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Acmispon americanus
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Montana, south to Mexico
Habitat: Chiefly in sandy to rocky, exposed or wooded areas, more common at low elevations
Origin: Native
Flowers: April - September
var. americanus – Spanish-clover, American bird's-foot trefoil
Acmispon denticulatusriver-bar bird's-foot-trefoil
Origin: Native
Acmispon nevadensis
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia south to California, east to Idaho and Nevada.
Habitat: Open, disturbed areas including road cuts, balds, grasslands, and forest edges at low to moderate elevations.
Flowers: May-June
var. nevadensis – Nevada deervetch
Acmispon parviflorusshort-flower bird's-foot-trefoil
Distribution: Occurring chiefly west of the Cascades in Washington and in the Columbia River Gorge; British Columbia south to California.
Habitat: Open slopes and sandy flats, seashore into the mountains.
Origin: Native
Flowers: April-September
Alhagi maurorumcamelthorn
Distribution: East of the Cascades in Washington; south to California, east to Idaho and Texas.
Habitat: Disturbed areas in arid lands.
Origin: Introduced
Flowers: June-August
Amorpha fruticosafalse indigo-bush
Distribution: Occurring chiefly east of the Cascades crest and along the Columbia River in Washington; widely distributed throughout much of North America except extreme northwest corner.
Habitat: Disturbed areas, roadsides, wastelots, and often along streams and in canyons.
Origin: Introduced
Flowers: May-July
Astragalus agrestiscock's-head, field milk vetch, purple milk vetch
Distribution: Occurring east of the Cascades crest in Washington; widely distributed in the western, central, and northeastern regions of North America.
Habitat: Moist spots in sagebrush plains, and mountain meadows to alpine slopes.
Origin: Native
Flowers: June-August
Astragalus alpinus
Distribution: Circumpolar, arctic to sub-alpine regions, south to Okanogan County, WA, the Wallowa Mountains of Oregon, and the Rocky Mountains of Montana and Idaho.
Habitat: Open, often rocky areas.
Flowers: June - August
var. alpinus – alpine milk-vetch
Astragalus arrectushanging pod milk-vetch, Palouse milk-vetch
Origin: Native
Astragalus arthuriiArthur's milk-vetch, waha milk-vetch
Distribution: Occurring in the southeastern corner of Washington; northern foothills of the Wallowa and Blue Mountains in Oregon and Nez Perce County, Idaho.
Habitat: Dry, grassy and rocky meadows, on basalt.
Origin: Native
Flowers: May-June
Astragalus asotinensis
Distribution: Endemic to Snake River Canyon of WA and ID.
Habitat: Shrub-steppe at low to moderate elevations.
Origin: Native
Flowers: March-May
Astragalus australis
Distribution: Endemic to Olympic Mountains of Washington.
Habitat: Ridge tops and talus slopes.
Origin: Native
Flowers: June-August
var. cottonii – Cotton's milk-vetch, Cotton's milkvetch
Astragalus beckwithii
Origin: Native
Flowers: April - June
var. weiserensis – beckwith's milk-vetch
Astragalus canadensis
Origin: Native
var. brevidens – Canada milk-vetch
var. canadensis – Canada milk-vetch
var. mortonii – Morton's Canadian milkvetch
Astragalus caricinusbuckwheat milk-vetch
Distribution: Occurring east of the Cascades crest in the south-central part of Washington; Washington south to Oregon, east to Idaho.
Habitat: Grasslands, dry and sandy slopes in shrub-steppe habitat.
Origin: Native
Flowers: April-May
Astragalus cicerchickpea milk-vetch
Distribution: Scattered locations throughout Washington; distributed throughout much of western North America, and central and eastern Canada.
Habitat: Disturbed areas, often where moist or wet.
Origin: Introduced from old world.
Flowers: July-August
Astragalus collinus
Distribution: East of the Cascades, southern British Columbia south to Oregon, east to west-central Idaho along the Snake and Clearwater Rivers.
Habitat: Basaltic grasslands and sagebrush deserts.
Origin: Native
Flowers: May - June
var. collinus – hillside milk-vetch
Astragalus columbianusColumbian milk-vetch
Distribution: Occurring east of the Cascades crest in the south-central part of Washington; endemic to Washington;
Habitat: Dry, open areas in shrub-steppe.
Origin: Native
Flowers: April-May
Astragalus conjunctus
Distribution: Wasco County, Oregon, to the Blue Mountains, south along the Malheur River to the Steens, and east into Idaho
Habitat: Drier areas, moderate and higher elevations
var. rickardii – stiff milk-vetch
Astragalus cusickii
Distribution: Known only from Asotin County in Washington; Washington south to northeastern Oregon, east to Custer County, Idaho.
Habitat: Sagebrush plains to grassy or rocky slopes, often on talus.
Origin: Native
Flowers: May-July
var. cusickii – Cusick's milk vetch
Astragalus diaphanustransparent milk-vetch, John Day milk vetch
Distribution: Along the Columbia River from the mouth of the John Day river in Wasco County, Oregon, to Klickitat County, Washington.
Habitat: Gravel bars, alluvial slopes, and in thin gravelly soil overlying basaltic rock.
Origin: Native
Flowers: May - June
Astragalus falcatusRussian-sickle
Origin: Introduced
Flowers: July
Astragalus filipesbasalt milk-vetch
Distribution: Occurring east of the Cascades crest in Washington; British Columbia south to northeast California, east to Nevada and Idaho.
Habitat: Sagebrush plains and lower foothills.
Origin: Native
Flowers: May-June
Astragalus geyeri
Distribution: Southeast Oregon to California and Nevada, east through the Snake River drainage of Idaho.
Habitat: Sandy desert, especially on dunes.
Origin: Native
Flowers: June - July
var. geyeri – Geyer's milk-vetch
Astragalus hoodianusHood River milk-vetch
Distribution: Columbia River Gorge, Wasco and Hood River Counties in Oregon, Klickitat County in Washington
Habitat: Dry, open areas
Origin: Native
Flowers: April - June
Astragalus howelliiHowell's milk-vetch
Origin: Native
Flowers: April - June
Astragalus inflexusbent milk-vetch, hairy milk-vetch
Distribution: Occurring east of the Cascades crest in Washington; Washington south to Oregon, east to Idaho and Montana.
Habitat: Dry hillsides in shrub-steppe habitat.
Origin: Native
Flowers: April-July
Astragalus kentrophyta
Origin: Native
Flowers: July - September
var. douglasii – thistle milk vetch
Astragalus laxmannii
Origin: Native
var. robustior – standing milk-vetch
Astragalus leibergiiLeiberg's milk-vetch
Distribution: Endemic to Douglas, Kittitas and Chelan counties of central Washington.
Habitat: Dry hillsides and plains, commonly in sagebrush scabland on basalt.
Origin: Native
Flowers: April-June
Astragalus lentiginosus
Distribution: East of the Cascades crest in Washington; British Columbia south to California, east to Montana and Texas.
Habitat: Open areas, desert flats to subalpine slopes.
Origin: Native
Flowers: April-June
var. lentiginosus – freckled milk-vetch, specklepod milk-vetch
Astragalus lyalliiLyall's milk-vetch
Distribution: Endemic to Washington from Kittitas and Douglas counties south to Benton, east to Grant and Adams counties.
Habitat: Sagebrush and desert areas, especially on sand dunes.
Origin: Native
Flowers: May-June
Astragalus microcystislesser-bladder milk-vetch
Distribution: Northeast Washington and adjacent British Columbia, across Idaho to Montana and Wyoming
Habitat: Prairies and foothills to Ponderosa pine forests
Origin: Native
Flowers: May - July
Astragalus misellus
Distribution: Occurring east of the Cascades crest in Washington; Washington south to Oregon.
Habitat: Dry, open areas in shrub-steppe.
Origin: Native
Flowers: April-June
var. pauper – pauper milk-vetch
Astragalus miser
Distribution: Occurring chiefly east of the Cascades crest in Washington; southern British Columbia and northern Washington east to Alberta and South Dakota, and south in the Rockies to Colorado.
Habitat: Moist meadowlands to open, dry ridges, and in grasslands and foothills to above timberline in the mountains.
Origin: Native
Flowers: May-July
var. miser – weedy milk-vetch
var. serotinus – weedy milk-vetch
Astragalus pulsiferae
Distribution: Mt. Adams and Klickitat County, Washington, and the ascades and northern Sierra Nevada of California; not reported from Oregon.
Habitat: Sandy and gravelly flats in sagebrush and open pine forests on basalt.
Origin: Native
Flowers: July
var. pulsiferae – ames milk-vetch
var. suksdorfii – ames milk-vetch
Astragalus purshii
Distribution: East of the Cascades in Washington; British Columbia to California, east to the Dakotas and New Mexico.
Habitat: Prairies and sagebrush deserts, foothills and lower mountains.
Origin: Native
Flowers: April-June
var. glareosus – woolly-pod milk-vetch
var. purshii – woolly-pod milk-vetch
var. tinctus – woolly-pod milk-vetch
Astragalus reventiformisYakima milk-vetch
Distribution: East of the Cascades in Washington; Washington south to Sherman County in Oregon.
Habitat: Shrub-steppe to low, dry open forests.
Origin: Native
Flowers: April-June
Astragalus reventuslongleaf milk-vetch, Blue Mt.milk-vetch
Distribution: Occurring east of the Cascades crest in Washington; Washington south to northeastern Oregon.
Habitat: Forest openings at low to moderate elevations.
Origin: Native
Flowers: April-June
Astragalus ripariusPiper's milk-vetch
Distribution: Along the Snake River from the Clearwater to the Tucannon River, Whitman and Columbia Counties, WA, and in Nex Perce County, ID.
Habitat: Dry bluffs and canyon banks.
Origin: Native
Flowers: May - June
Astragalus robbinsii
Distribution: Alaska and British Columbia south on the east side of the Cascades to Okanogan County, Washington,east to Alberta and south in the Rockies to Colorado.
Habitat: Stream banks and alpine slopes.
Origin: Native
Flowers: June - August
var. minor – Robbin's milk-vetch
Astragalus sclerocarpusstalked-pod milk-vetch, woody-pod milk-vetch
Distribution: Along the Okanogan and Columbia Rivers from north of Kettle Falls to The Dalles
Habitat: Dunes and sandy barrens, low elevation
Origin: Native
Flowers: June
Astragalus sheldoniiSheldon's milk-vetch
Distribution: Occurring in the southeastern part of Washington; Washington south to Oregon, east to Idaho.
Habitat: Shrub-steppe and Ponderosa pine forest openings.
Origin: Native
Flowers: April-June
Astragalus sinuatuswhited milk-vetch
Distribution: Along Colockum Creek, south of Wenatchee in Chelan County, Washington.
Habitat: Among sagebrush on rocky hillsides.
Origin: Native
Flowers: May
Astragalus spaldingiiSpalding's milk-vetch
Distribution: East of the Cascades, central Washington to northeast Oregon, east to western Idaho.
Habitat: Sagebrush and grasslands in the foothills and valleys.
Origin: Native
Flowers: May - June
Astragalus speirocarpuscurve-pod milk-vetch, medic milk-vetch, spiral-pod milk-vetch
Distribution: Endemic to Washington from Kittitas County east to Grant County, south Klickitat County.
Habitat: Sagebrush desert.
Origin: Native
Flowers: April-May
Astragalus succumbenscrouching milk-vetch, sprawling milk-vetch
Distribution: Occurring east of the Cascades crest in Washington from Kittitas and Grant counties south; Washington south to Umatilla and Gilliam Counties, Oregon.
Habitat: Sagebrush deserts, sandy barrens and lower foothills.
Origin: Native
Flowers: April-June
Astragalus tenelluspulse milkvetch
Origin: Native
Astragalus tweedyiTweedy's milk-vetch
Distribution: Yakima County, Washington, south to north-central Oregon near the olumbia dn lower Deschutes Rivers
Habitat: Sagebrush plains and foothills
Origin: Native
Flowers: May - June
Astragalus whitneyi
Distribution: Occurring east of the Cascades in Washington; Washington south to California, east to Idaho and Nevada.
Habitat: High, open, rocky ridges and slopes, often in serpentine.
Origin: Native
Flowers: May-August
var. sonneanus – balloon milk-vetch
Caragana arborescensSiberian peashrub
Distribution: Occurring east of the Cascades crest in Washington; widely distributed throughout the western, central, and northeastern regions of North America.
Habitat: Disturbed areas including wastelots, roadsides, and fields.
Origin: Introduced
Flowers: April-June
Cicer arietinumchick-pea
Distribution: Sparingly introduced in eastern Washington; scattered localities in other parts of western North America.
Habitat: Disturbed areas on the edge of or near agricultural fields.
Origin: Introduced
Flowers: June-July
Colutea arborescensbladder-sennas
Distribution: Occurring east of the Cascades crest in Washington; Washington south to California, east across the southwest to the Great Plains; northeastern North America.
Habitat: Disturbed areas in including wastelots, roadsides, and fields.
Origin: Introduced from Eurasia
Flowers: May-June
Cytisus multiflorusportuguese broom, white Spanish broom
Origin: Introduced
Flowers: May - June
Cytisus scopariusScot's broom
Distribution: Distributed widely throughout much of Washington, especially in lowlands west of the Cascades crest; British Columbia south to California.
Habitat: Widespread noxious weed, usually where somewhat moist.
Origin: Introduced
Flowers: April-June
Dalea ornataBlue Mountain prairie-clover
Distribution: Distributed in the central and southeastern counties in Washington; Washington south to California, east to Idaho and Nevada.
Habitat: Dry, rocky or sandy areas, often in sagebrush, low to moderate elevations.
Origin: Native
Flowers: May-July
Galega officinalisprofessor-weed
Distribution: Occurring west of the Cascades crest in Washington; occurring in scattered locations throughout North America, though not along the southern border.
Habitat: Disturbed areas including wastelots, roadsides, and fields.
Origin: Introduced
Flowers: May-July
Genista canariensiscanary-broom
Distribution: Occurring in a few scattered locations east of the Cascades crest in Washington; Washington and California.
Habitat: Disturbed areas including wastelots and roadsides
Origin: Introduced
Flowers: April-June
Genista monspessulanaFrench-broom
Distribution: Introduced as an ornamental in Western Washington, occasionally escaping.
Habitat: Waste areas.
Origin: Introduced
Flowers: June-July
Genista tinctoriaDyer's greenweed
Origin: Introduced
Gleditsia triacanthoshoney locust
Distribution: Occurring east of the Cascades crest in Washington; native to eastern and central North America, but escaped widely throughout western North America.
Habitat: On edge of riparian zones, typically in areas with some level of disturbance.
Origin: Introduced
Flowers: April-June
Glycyrrhiza lepidotaAmerican licorice, wild licorice
Distribution: Distributed east of the Cascades in Washington; British Columbia to Ontario, south to California and Texas.
Habitat: A plant of waste places and low ground, common along streams.
Origin: Native
Flowers: May-August
Hedysarum boreale
Origin: Native
Flowers: May - August
var. mackenziei – Mackenzie's northern sweetvetch
Hedysarum occidentalewestern sweet-vetch
Distribution: Occurring in the Olympic Mountains in Washington; British Columbia south to Washington, Idaho and Utah, east to Alberta, Montana, Wyoming, and Colorado.
Habitat: Alpine and subalpine areas.
Origin: Native
Flowers: June-August
Hedysarum sulphurescensyellow sweet-vetch
Distribution: East slope of the Cascades in Washington; British Columbia to Washington, east to Alberta and Montana.
Habitat: Open forested areas.
Origin: Native
Flowers: June-August
Laburnum anagyroidesgolden chain-tree
Distribution: Occurring chiefly west of the Cascades crest at low elevations in Washington; British Columbia south to California, Utah.
Habitat: Disturbed sites often in proximity to residential development where escaped from cultivation.
Origin: Introduced
Flowers: May-June
Laedeania lanceolatawild lemonweed, lance-leaf scurf pea, scurf-pea
Distribution: East of the Cascades in Washington, mostly in the central and southcentral areas of the state; Washington south to California, east to the central regions of Canada and the U.S.
Habitat: Sagebrush steppe habitat in dry areas, often where sandy.
Origin: Native
Flowers: May-June
Lathyrus aphacayellow vetchling
Distribution: Known only from the San Juan Islands in Washington; Washington south to California, and in scattered locations in central and southern U.S.
Habitat: Disturbed ground.
Origin: Introduced
Flowers: May-July
Lathyrus bijugatusdrypark pea
Origin: Native
Lathyrus holochlorusthin-leaf vetchling
Distribution: Occurring west of the Cascades crest in Washington; Washington south to Oregon.
Habitat: Fence rows and partially cleared land.
Origin: Native
Flowers: May-July
Lathyrus japonicus
Distribution: Coastal in Washington; Alaska south to California; also along the Atlantic Coast.
Habitat: Sandy beaches, dunes, and headlands along the coast.
Flowers: May-September
var. maritimus – beach pea
Lathyrus lanszwertii
Distribution: Occurring chiefly east of the Cascades crest in Washington; Washington south to California, east to Idaho and Utah.
Habitat: Sagebrush-ponderosa pine woodland to moderate elevations in the mountains.
Origin: Native
Flowers: May-June
var. aridus – pinewoods peavine
var. lanszwertii – thick-leaved peavine
Lathyrus latifoliuseverlasting-pea
Distribution: Occurring in locations throughout much of Washington; widespread in North America.
Habitat: Found in a variety of disturbed habitats, usually where somewhat moist.
Origin: Introduced
Flowers: May-July
Lathyrus littoralisbeach peavine, silky beach vetchling
Distribution: Occurring in the coastal counties in Washington; British Columbia south to California.
Habitat: Sand dunes and sandy beaches.
Origin: Native
Flowers: May-July
Lathyrus nevadensis
Distribution: Occurring on both sides of the Cascades crest and in the southeast corner of the State; British Columbia south to California, east to Idaho.
Habitat: Open woods at moderate to mid-elevations.
Origin: Native
Flowers: May-July
var. cusickii – Cusick's pea
var. nevadensis – Sierra pea
Lathyrus ochroleucuscream pea
Distribution: Occurring east of the Cascades crest along the northern border in Washington; Alaska south to Washington, east across the northern U.S. and Canada to the Atlantic Coast.
Habitat: Moist woods, at the edge of thickets.
Origin: Native
Flowers: May-July
Lathyrus palustrismarsh pea
Distribution: Occurring along the Puget Sound and outer coast in Washington; widely distributed throughout most of North America except the Rocky Mountain and southeastern regions of the U.S.
Habitat: Chiefly in tidelands along the coast.
Origin: Native
Flowers: April-July
Lathyrus pauciflorus
Distribution: Occurring chiefly east of the Cascades crest in Washington;, Washington, south to California, east to Idaho and Arizona.
Habitat: Shrub-steppe to Ponderosa pine and higher open forests.
Origin: Native
Flowers: April-June
var. pauciflorus – few-flowered pea
Lathyrus polyphyllusleafy pea
Distribution: Occurring west of the Cascades crest in lowland Washington, and east up the Columbia River Gorge; Washington south to California.
Habitat: Prairies and open areas of low mountains.
Origin: Native
Flowers: May-July
Lathyrus pratensismeadow vetchling
Origin: Native
Flowers: May - July
Lathyrus sphaericusgrass pea
Origin: Introduced
Flowers: May - June
Lathyrus sylvestrisnarrow-leaf pea
Distribution: Occurring chiefly west of the Cascades in Washington.
Habitat: Roadsides and waste places at low elevations.
Origin: Introduced
Flowers: May-July
Lathyrus torreyiTorrey's pea
Distribution: Occurring west of the Cascades crest in Washington; Washington south to California.
Habitat: Open prairies and clearings in the woods at low elevations.
Origin: Native
Flowers: May-July
Lathyrus tuberosusearth-nut pea
Origin: Introduced
Flowers: May - July
Lathyrus vestitus
Flowers: April - June
var. ochropetalus – Pacific pea, Pacific peavine
Lotus aboriginusrosy bird's-foot-trefoil
Distribution: West of the Cascades in Washington; Washington south to California.
Habitat: Moist woods and along streams.
Origin: Native
Flowers: May-July
Lotus corniculatusgarden bird's-foot-trefoil
Distribution: Occurring on both sides of the Cascades in Washington; widely distributed throughout most of North America.
Habitat: Mesic to wet areas, typically where disturbed.
Origin: Introduced
Flowers: May-September
Lotus crassifolius
Distribution: Chiefly west of the Cascades and towards the south in Washington; south to southern California.
Habitat: Moist woods and along streams, from sea level to moderate elevations in the mountains.
Flowers: May-July
var. crassifolius – big deervetch
Lotus formosissimusseaside bird's-foot-trefoil
Distribution: From southwest Washington south, on the west side of the Cascades and in the Coast Ranges, to Monteray County, California.
Habitat: On moist soil, from near sea level to lower elevations in the mountains.
Origin: Native
Flowers: May - July
Lotus pinnatusmeadow bird's-foot-trefoil, meadow deervetch
Distribution: Northwest Washington south to central California, east along rivers to Idaho.
Habitat: Moist soil.
Origin: Native
Flowers: May - July
Lotus tenuisnarrow-leaved trefoil
Origin: Introduced
Lotus uliginosusbig lotus, big trefoil, large trefoil
Distribution: West of the Cascades in Washington; British Columbia south to California, east to Idaho; east across Canada to Nova Scotia; scattered localities in eastern U.S.
Habitat: Moist to wet disturbed areas, roadsides, abandoned lots, and coastal tidelands.
Origin: Introduced
Flowers: May-July
Lupinus albicaulissicklekeel lupine
Distribution: Chiefly west of the Cascades in Washington; Washington south to California.
Habitat: Grasslands and prairies from the lowlands to moderate elevations.
Origin: Native
Flowers: May-July
Lupinus arboreustree lupine, yellow-bush lupine
Distribution: Occurring in the western Washington lowlands and along the Pacific coast; British Columbia south to California.
Habitat: Sandy soil.
Origin: Introduced
Flowers: May-September
Lupinus arbustus
Distribution: East of the Cascades crest in Washington; British Columbia south to California, east to Montana and Utah.
Habitat: Sagebrush deserts and ponderosa pine forest openings.
Origin: Native
Flowers: May-July
ssp. arbustus – spurred lupine
ssp. calcaratus – spurred lupine
ssp. neolaxiflorus – spurred lupine
ssp. pseudoparviflorus – spurred lupine
ssp. silvicola – spurred lupine
var. montanus – spurred lupine
Lupinus argenteus
Distribution: Chiefly east of the Cascades in Washington; British Columbia south to California, east to the Dakotas and New Mexico.
Habitat: Ponderosa pine forests to subalpine ridges.
Flowers: May-July
var. argenteus – silvery lupine
Lupinus bicolorsmall-flower lupine, two-color lupine
Distribution: Chiefly west of the Cascades in Washington, but also in southeastern part of state; British Columbia south to California, east to Arizona.
Habitat: Open meadows, grasslands, prairies, and sandy riverbanks at low to moderate elevations.
Origin: Native
Flowers: April-July
Lupinus bingenensis
Distribution: East of the Cascades in Washington; mostly in the Columbia River Gorge in Washington and Oregon.
Habitat: Dry areas at low to moderate elevations in shrub-steppe to montane forest.
Origin: Native
Flowers: April-June
var. bingenensis – Bingen lupine
var. dubius – Bingen lupine
Lupinus latifolius
Distribution: In the Olympic and Cascade mountains of Washington; British Columbia south to California.
Habitat: Chiefly in forest openings at mid-elevation to subalpine meadows.
Origin: Native
Flowers: June-August
var. latifolius – broadleaf lupine
var. subalpinus – broadleaf lupine
var. thompsonianus – Suksdorf's lupine
Lupinus lepidus
Distribution: Widely distributed throughout Washington; Alaska south to California, east to the Rocky Mountains.
Habitat: Open areas from low elevations to the alpine.
Origin: Native
Flowers: June-August
var. aridus – prairie lupine
var. cusickii – elegant lupine
var. lepidus – Pacific lupine
var. lobbii – elegant lupine
Lupinus leucophyllusvelvet lupine
Distribution: Occurring east of the Cascades crest in Washington; British Columbia south to California, east to Montana, Wyoming, and Colorado.
Habitat: Shrub-steppe and ponderosa pine forests.
Flowers: June-August
var. leucophyllus – velvet lupine
var. tenuispicus – velvet lupine
Lupinus littoralisseashore lupine
Distribution: Coastal from British Columbia to California
Habitat: Near the shore along the coast
Origin: Native
Flowers: May - August
Lupinus microcarpus
Distribution: Chiefly west of the Cascades in Washington, though also known from east of Cascades; British Columbia south to California.
Habitat: Coastal bluffs, grassy balds, and other dry, open areas at low elevations.
Flowers: April-June
var. microcarpus – chick lupine
var. scopulorum – chick lupine
Lupinus oreganusOregon lupine
Distribution: West of the Cascades in Washington; south to Willamette Valley in Oregon.
Habitat: Moist to dry areas of prairies and openings in oak woodlands.
Flowers: April-June
var. kincaidii – Kincaid's lupine, Oregon lupine, sulphur lupine
Lupinus pachylobusbig-pod lupine
Origin: Introduced?
Lupinus polyphyllus
Distribution: Widely distributed throughout Washington; British Columbia south to California, east to Colorado.
Habitat: Moist areas and stream banks, low to fairly high elevations.
Origin: Native
Flowers: June-September
var. burkei – large-leaved lupine, many-leaved lupine
var. pallidipes – large-leaved lupine
var. polyphyllus – large-leaved lupine
var. prunophilus – large-leaved lupine
Lupinus pusillus
Distribution: Occurring east of the Cascades crest in south-central Washington; Washington south to California, east to the Rocky Mountains and Great Plains of Canada and the U.S.
Habitat: Shrub-steppe habitat, often where sandy.
Origin: Native
Flowers: May-June
var. intermontanus – low lupine, rusty lupine
Lupinus rivularisriver-bank lupine
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia south to California.
Habitat: Gravelly prairies, open woods and river banks at low elevations.
Origin: Native
Flowers: April-September
Lupinus sabinianusSabin's lupine
Distribution: Blue Mountains of southeast Washington; south to northeast Oregon.
Habitat: Forest openings and grasslands at low to moderate elevations.
Origin: Native
Flowers: May-June
Lupinus saxosusrock lupine
Distribution: Occurring east of the Cascades crest in Washington; Washington south to California, east to Idaho and Nevada.
Habitat: Shrub-steppe habitat.
Origin: Native
Flowers: April-May
Lupinus sericeus
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia south to Oregon, east to Alberta and south to Arizona.
Habitat: Sagebrush deserts to forest openings at moderate elevations.
Origin: Native
Flowers: May-August
var. asotinensis – Asotin silk lupine
var. fikeranus – silky lupine
var. sericeus – silky lupine
Lupinus sulphureus
Distribution: Occurring east of the Cascades crest in Washington; British Columbia south to California.
Habitat: Shrub-steppe, grassland, and open ponderosa pine forests.
Flowers: April-June
var. subsaccatus – Bingen lupine
var. sulphureus – sulphur lupine
Lupinus wyethiiWyeth's lupine
Distribution: Distributed widely throughout Washington, but chiefly east of the Cascades; British Columbia to Oregon, east to Rocky Mountains as far south as Colorado.
Habitat: Open areas from low to moderate elevations, including the subalpine.
Origin: Native
Flowers: May-July
Medicago arabicaspotted medic
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia south to California, east to Montana; also in the central, southern, and northeastern U.S.
Habitat: Disturbed areas including wastelots, roadsides and fields.
Origin: Introduced
Flowers: April-July
Medicago lupulinahop clover, black medic
Distribution: Widely distributed throughout Washington; widely distributed throughout much of North America.
Habitat: Waste places and sandy or gravelly soil.
Origin: Introduced
Flowers: April-August
Medicago minimaburr medick
Distribution: Sparingly introduced in the Pacific Coast states, and some states in the southern and eastern United States
Habitat: Escaped from cultivation
Origin: Introduced
Flowers: March - June
Medicago polymorphatoothed medick
Distribution: Introduced from Europe and found almost throughout the United States; escecially abundant west of the Cascades and Sierra Nevada.
Habitat: Waste ground and disturbed areas, mostly at low elevations.
Origin: Introduced
Flowers: March - June
Medicago sativaalfalfa, lucerne
Distribution: Introduced as a forage crop in the temperate regions of the world
Habitat: Near cultivated fields, roadsides, often on dry ground
Origin: Introduced
Flowers: June - October
Melilotus albus
Distribution: Widely distributed across Washington; widely distributed as a weed over most of the United States and southern Canada.
Habitat: Roadsides, waste ground, disturbed soil.
Origin: Introduced
Flowers: May-October
Melilotus indicussmall flowered yellow sweet clover, Indian sweet-clover
Distribution: Sparingly introduced in western Washington and Oregon, more common in California.
Habitat: Waste ground, disturbed soil.
Origin: Introduced
Flowers: May - July
Melilotus officinalisyellow sweet-clover
Distribution: Widely distributed throughout Washington; introduced throughout the United States
Habitat: Widespread weed of roadsides and waste ground.
Origin: Introduced
Flowers: May-September
Onobrychis viciifoliaholy-clover, saintfoin, sandfain
Distribution: Occasionally introduced in scattered locations throughout Washington; ranging throughout western North America and parts of central and eastern North America.
Habitat: Waste ground, disturbed soil.
Origin: Introduced
Flowers: June-August
Ononis repenscommon restharrow
Origin: Introduced
Flowers: August
Oxytropis borealis
Distribution: Alaska to Quebec, south chiefly in the Rocky Mountains to Colorado, west to the Sierra Nevada of California, the Wallowas of Oregon and the Olympics of Washington.
Habitat: Alpine and subalpine habitats.
Origin: Native
Flowers: June - August
var. viscida – sticky crazyweed
Oxytropis campestris
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska south to Oregon, east to Wisconsin and Quebec, south in the Rockies to Colorado.
Habitat: Forest openings and rocky balds from sea-level to the alpine.
Origin: Native
Flowers: May-July
var. columbiana – slender crazyweed
var. cusickii – slender crazyweed
var. gracilis – yellow-flower locoweed
var. wanapum – wanapum crazyweed
Oxytropis deflexa
Distribution: Occurring in north-central Washington; widely distributed throughout western North America and across Canada.
Habitat: Forest openings and meadows at moderate elevations in the mountains.
Origin: Native
Flowers: June-July
var. sericea – pendant-pod crazyweed
Pisum sativumgarden pea
Origin: Introduced
Robinia hispidabristly locust
Distribution: Introduced as an ornamental, occasionally escaping.
Habitat: Disturbed soil.
Origin: Introduced
Flowers: June - July
Robinia pseudoacaciablack locust
Distribution: Native to eastern United States, and widely introduced in the West
Habitat: Common around old homesteads, along river banks
Origin: Introduced
Flowers: May - June
Rupertia physodesCalifornia-tea
Distribution: West of the Cascades in Washington; Washington south to California.
Habitat: Prairie and forest edges at low elevations.
Origin: Native
Flowers: May-June
Securigera variapurple crown-vetch, crown vetch
Distribution: Occurring in scattered locations in Washington; widely distributed throughout much of North America.
Habitat: Disturbed areas including wastelots, roadsides, and fields.
Origin: Introduced
Flowers: June-August
Spartium junceumSpanish-broom
Distribution: West of the Cascades in Washington; Washington south to California
Habitat: Disturbed areas, roadsides, forest margins.
Origin: Introduced
Flowers: April-September
Sphaerophysa salsulared bladder-vetch
Distribution: Occurring east of the Cascades in Washington; widely distributed in western half of North America except for northwestern provinces and Alaska.
Habitat: Alkaline soil at low elevations.
Origin: Introduced
Flowers: May-July
Thermopsis montana
Distribution: Occurring on both sides of the Cascades in Washington; British Columbia south to California, east to the Rockies of Montana and Colorado.
Habitat: Sandy, well-drained soil to wet meadowland, low to moderate elevations.
Origin: Native
Flowers: May-August
var. montana – mountain thermopsis
var. ovata – slender goldenbanner, Hitchcock's thermopsis
Trifolium albopurpureumrancheria clover, Rancheria clover
Distribution: Known from only a few scattered locations in Washington; Washington south to California, east to Arizona.
Habitat: Coastal bluffs to forest openings at middle elevations.
Origin: Native
Flowers: May-June
Trifolium arvenserabbit-foot clover, hare's foot
Distribution: Introduced chiefly west of the Cascades in Washington; British Columbia south to Oregon.
Habitat: Uncommon in waste places and roadsides.
Origin: Introduced
Flowers: May-July
Trifolium aureumgolden clover, greater hop clover, yellow clover
Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; Alaska south to California, east to Montana and Wyoming; also occurring in most of eastern North America.
Habitat: Roadsides, railways and waste places.
Origin: Introduced
Flowers: June-September
Trifolium bifidumnotch-leaf clover, pinole clover
Origin: Native
Flowers: April - June
Trifolium campestrehop clover
Distribution: Distributed chiefly west of the Cascades in Washington; distributed widely throughout North America.
Habitat: Wastelands, roadsides, meadows, and other disturbed areas.
Origin: Introduced
Flowers: May-August
Trifolium cernuumnodding clover
Trifolium ciliolatumfoothill clover, tree clover
Distribution: Southern Washington south to Baja California west of the Cascades and Sierra Nevada, at elevations of up to several thousand feet in the south.
Habitat: Wet meadows to rather dry, sandy soil.
Origin: Native
Flowers: April - June
Trifolium cyathiferumbowl clover, cup clover
Distribution: Occurring chiefly east of the Cascades in Washington; British Columbia south to California.
Habitat: Uncommon in wet meadows to fairly dry, sandy soil, at moderate elevations.
Origin: Native
Flowers: May-July
Trifolium depauperatum
Distribution: Central Oregon to southern California; sporadic and possibly always introduced in Washington and Vancouver Island, British Columbia.
Habitat: Open areas at low elevations.
Origin: Introduced
Flowers: April - June
var. depauperatum – poverty clover
Trifolium dichotomumbranched Indian clover
Distribution: Occurring in the San Juan Islands in Washington; Willamette Valley, OR south to California.
Habitat: Open forest, sandy embankments, and grassy balds on islands.
Origin: Native
Flowers: April-June
Trifolium douglasiiDouglas' clover
Distribution: Known from Garfield, Spokane, and Whitman counties in Washington; eastern Washington south to east-central Oregon, east to eastern Idaho; disjunct in sw Oregon.
Habitat: Moist to wet areas in including open meadows, forested wetlands, and streambanks.
Origin: Native
Flowers: June-July
Trifolium dubiumleast hop clover, suckling clover
Distribution: Occurring on both sides of the Cascades crest in Washington; widely distributed throughout much of North America.
Habitat: Disturbed areas including forest openings, meadows, wastelots, roadsides, and lawns.
Origin: Introduced
Flowers: April-September
Trifolium eriocephalum
Distribution: Cascades from southern Washington to Northern California, east to Nevada, Utah and Montana
Habitat: Moderate to mid-elevations in the mountains
Origin: Native
Flowers: May - July
var. eriocephalum – woolly-head cloover
var. piperi – woolly-head clover
Trifolium fragiferumstrawberry clover
Distribution: Introduced and occasionally established in Washington, Oregon and Idaho; more common in eastern United States.
Habitat: Waste places, disturbed soil.
Origin: Introduced
Flowers: April - July
Trifolium glomeratumclustered clover
Origin: Introduced
Trifolium gracilentum
Flowers: April - June
var. gracilentum – slender clover
Trifolium hirtumrose clover
Origin: Introduced
Trifolium hybridumAlsike clover
Distribution: Introduced in Western United States
Habitat: Near cultivated fields and roadsides
Origin: Introduced
Flowers: April - September
Trifolium incarnatumcrimson clover
Distribution: Introduced, occasionally established in western Washington and Oregon.
Habitat: Wasteland, pastures, disturbed soil.
Origin: Introduced
Flowers: May - June
Trifolium latifoliumtwin clover
Distribution: Wallowa County, Oregon to Missoula, Montana.
Habitat: Moist meadows to rocky ridges.
Origin: Native
Flowers: June - August
Trifolium longipes
Distribution: Common on both sides of the Cascades in Washington; British Columbia south to California, east to the Rocky Mountains.
Habitat: Meadows and valleys, lower mountains to subalpine slopes.
Origin: Native
Flowers: May-August
var. longipes – long-stalked clover
var. multiovulatum – long-stalked clover
var. multipedunculatum – long-stalked clover
var. reflexum – long-stalked clover
Trifolium macrocephalumbig-head clover, large-head clover
Distribution: Occurring east of the Cascades crest in Washington; Washington, south through eastern Oregon, east to Idaho and Nevada.
Habitat: Shrub-steppe, sagebrush desert and ponderosa pine woodlands.
Origin: Native
Flowers: April-June
Trifolium microcephalumsmall-head clover
Distribution: Distributed widely throughout Washington; British Columbia to Baja California, east to Montana and Arizona.
Habitat: Moist meadows, sandy riverbanks and drier hillsides, coastal to mid-elevations in the mountains.
Origin: Native
Flowers: April-June
Trifolium microdonthimble clover, Valparaiso clover
Distribution: Chiefly west of the Cascades in Washington; British Columbia south to California.
Habitat: In meadows or on rocky or sandy soil at low elevations.
Origin: Native
Flowers: April-June
Trifolium oliganthumfew-flowerered clover
Distribution: West of the Cascades, from southwest British Columbia to California.
Habitat: Meadowland to dry, rocky soil at low elevations.
Origin: Native
Flowers: March-July
Trifolium plumosum
Origin: Native?
Flowers: May - August
var. amplifolium – plumed clover
var. plumosum – plumed clover
Trifolium pratensered clover
Distribution: Introduced throughout the United States; common forage crop in the Pacific Northwest
Habitat: Escaped from cultivation; found along mountain trails where horses have been used
Origin: Introduced
Flowers: June - August
Trifolium repensDutch clover, white clover
Distribution: Widely distributed throughout Washington; widely distributed throughout North America.
Habitat: Established in a variety of native habitats, such as mountain meadows
Origin: Introduced
Flowers: April-September
Trifolium resupinatumreversed clover
Origin: Native
Trifolium retusumteasel clover
Origin: Introduced
Trifolium striatumknotted clover
Trifolium subterraneumburrowing clover
Distribution: Chiefly west of the Cascades in Washington; British Columbia south to California; southeastern U.S.
Habitat: Pastures, prairies, roadsides and other open, disturbed areas at low elevations.
Origin: Introduced
Flowers: April-June
Trifolium suffocatumsuffocated clover
Origin: Introduced
Trifolium thompsoniiThompson's clover
Distribution: Swakane Canyon, Chelan County, Washington, north to Entiat Valley, and in Douglas County opposite Swakane Canyon.
Habitat: Common on dry, grassy hillsides just below the ponderosa pine woodlands
Origin: Native
Flowers: May - June
Trifolium variegatumwhite-tip clover
Distribution: Widely distributed throughout much of Washington; Alaska south to California, east towards the Rocky Mountains.
Habitat: Dry, sandy soil to moist meadows.
Origin: Native
Flowers: April-July
Trifolium vesiculosumarrow-leaf clover
Distribution: Occurring in a few locations in lowland western Washington; Washington south to California; also in the south-central and southeastern U.S.
Habitat: Disturbed areas in including wastelots, roadsides, and fields.
Origin: Introduced
Trifolium willdenoviisand clover; tomcat clover, springbank clover
Distribution: West side of the Cascades and east along the Columbia River in Washington; British Columbia south to California.
Habitat: Grassy hillsides, balds, prairies and meadows at low to moderate elevations.
Origin: Native
Flowers: April-July
Trifolium wormskioldiicow clover, salt marsh clover
Distribution: Alaska to California, east to Montana and New Mexico; more common west of the Cascades in Washington
Habitat: Costal dunes to moist meadows and stream banks at low to moderate elevations in the mountains
Origin: Native
Flowers: May - September
Ulex europaeuscommon gorse
Distribution: Occurring west of the Cascades crest in Washington; British Columbia south to California; also in the eastern U.S.
Habitat: Disturbed areas at low elevation, often near or along roadsides.
Origin: Introduced
Flowers: April-September
Vicia americana
Distribution: Widely distributed througout much of Washington; widely distributed throughout most of North America except the southeastern U.S.
Habitat: Forest openings from low to mid-elevations in the mountains.
Flowers: May-July
var. americana – American vetch
Vicia craccacat peas, tinegrass, bird vetch, tufted vetch
Distribution: Introduced and widely naturalized in eastern United States; occasional in the Rocky Mountains and westward.
Habitat: Waste land, roadsides.
Origin: Introduced
Flowers: May - July
Vicia hirsutahairy vetch, tiny vetch
Distribution: Introduced and fairly common in western Washington and Oregon
Habitat: Disturbed ground, gardens, low elevations
Origin: Introduced
Flowers: May - July
Vicia lathyroidesspring vetch
Distribution: Occurring in the Puget Sound lowlands in Washington; British Columbia south to California; also in southeastern U.S.
Habitat: Disturbed areas including wastelots, roadsides, and fields.
Origin: Introduced
Flowers: April-June
Vicia luteayellow vetch
Vicia nigricans
Distribution: Along the coast in Washington; coastal from Alaska to California, inland to the Willamette Valley in Oregon.
Habitat: Near streams or forest clearings at low elevations.
Origin: Native
Flowers: May-July
ssp. gigantea – giant vetch
Vicia pannonicaHungarian vetch
Origin: Introduced
Flowers: May - June
Vicia sativa
Distribution: Occurring on both sides of the Cascades crest in Washington, but more common on the west side; widely distributed throughout most of North America.
Habitat: Disturbed ground, yards and roadsides at low elevations.
Origin: Introduced
Flowers: April-July
var. angustifolia – tare, common vetch
var. sativa – common vetch
Vicia tetraspermaslender vetch
Distribution: Introduced and occasionally escaping west of the Cascades in Washington and Oregon, south to California.
Habitat: Waste ground and disgturbed soil.
Origin: Introduced
Flowers: May - August
Vicia villosa
Distribution: Occurring on both sides of the Cascades in Washington; distributed widely throughout much of North America.
Habitat: Disturbed meadows, grasslands, prairies, roadsides and other open areas.
Flowers: June-September
ssp. varia – hairy vetch, winter vetch, woolly vetch
ssp. villosa – smoooth tare, lentil vetch, slender vetch