Fabaceae
Pea Family
Synonyms:
Leguminosae [HC]
36 genera
184 species
85 subspecies and varieties
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Acmispon americanusAmerican bird's-foot trefoil
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Rocky Mountains, 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 – American bird's-foot trefoil
Acmispon denticulatusriverbar bird's-foot-trefoil
Distribution: Occurring on both sides of the Cascades in Washington; southern British Columbia to California, disjunct in southern Idaho and southwestern Utah.
Habitat: Sandy to rocky soil in open areas at low to moderate elevations.
Origin: Native
Flowers: April-June
Acmispon nevadensisNevada bird's-foot trefoil, Nevada deervetch
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.
Origin: Native
Flowers: May-June
var. nevadensis – Nevada deervetch
Acmispon parviflorussmall-flowered bird's-foot trefoil
Distribution: Occurring chiefly west of the Cascades crest and east in the Columbia River Gorge in Washington; British Columbia to California.
Habitat: Open slopes and sandy flats, seashore into the mountains.
Origin: Native
Flowers: April-September
Alhagi maurorumcamelthorn
Distribution: Occurring east of the Cascades crest in Washington; Washington, Idaho, and California east to Colorado and Texas.
Habitat: Disturbed areas in arid lands at low to moderate elevations.
Origin: Introduced from Asia
Flowers: June-August
Amorpha fruticosafalse indigo-bush
Distribution: Occurring chiefly east of the Cascades crest and along the Columbia River in Washington; Washington to California, east across much of North America, including eastern Canada.
Habitat: Disturbed areas, roadsides, wastelots, and often along streams, rivers and other riparian corridors.
Origin: Introduced from eastern North America, where native
Flowers: May-July
Astragalus agrestiscock's-head, field milk vetch, purple milk vetch
Distribution: Occurring east of the Cascades crest in Washington; Yukon Territory to California, east across North America to Canada\'s Atlantic Coast.
Habitat: Moist spots in sagebrush plains, and mountain meadows to alpine slopes.
Origin: Native
Flowers: June-August
Astragalus alpinusalpine milk-vetch, purple milk-vetch
Distribution: Occurring in the northcentral region of Washington; Alaska to northeastern Oregon and northeastern Nevada, east to the Rocky Mountains; circumpolar.
Habitat: Open slopes and rocky areas from upper montane to alpine.
Origin: Native
Flowers: June-August
var. alpinus – alpine milk-vetch
Astragalus arrectushanging pod milk-vetch, Palouse milk-vetch
Distribution: Known from Lincoln and Whitman counties in Washington; eastern Washington to adjacent Idaho.
Habitat: Sagebrush flats to open ponderosa pine forest.
Origin: Native
Flowers: April-June
Astragalus arthuriArthur's milk-vetch
Distribution: Known only from Asotin County in Washington; southeastern Washington to northeastern Oregon and adjacent west-central Idaho.
Habitat: Grassy hills and rocky meadows, often on basalt.
Origin: Native
Flowers: May-June
Astragalus arthurii
Origin: Native
Astragalus asotinensisAsotin milk-vetch
Distribution: Known only from Asotin County in Washington; Endemic to Snake River Canyon of southeastern Washington and adjacent Idaho.
Habitat: Grassy slopes in shrub-steppe at low to moderate elevations.
Origin: Native
Flowers: March-May
Astragalus australisIndian milk-vetch, subarctic milk-vetch
Distribution: Occurring in the Olympic Mountains in Washington; Alaska south in the Rocky Mountains to northeastern Oregon, Nevada, Utah, and Colorado, east to the Great Plains and eastern Canada.
Habitat: Foothill bluffs and riverbanks to subalpine and alpine ridges and scree.
Origin: Native
Flowers: June-August
var. cottonii – Cotton's milk-vetch, Cotton's milkvetch
Astragalus beckwithiiBeckwith's milk-vetch
Distribution: Occurring in the southeastern region of Washington; southeastern Washington to northeastern Nevada, east to western Idaho along the Snake River drainage, also disjunct in Kamloops, British Columbia.
Habitat: Sagebrush desert to dry hillsides.
Origin: Native
Flowers: April-June
var. weiserensis – Beckwith's milk-vetch
Astragalus canadensisCanada milk-vetch
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east across North America to the Atlantic Coast.
Habitat: Prairies, stream banks, ditches, ponderosa pine forest openings, and seasonally moist alkaline flats in sagebrush.
Origin: Native
Flowers: April-June
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 along the Snake River corridor to Oregon and southwestern Idaho.
Habitat: Grasslands, dry and sandy slopes in shrub-steppe habitat.
Origin: Native
Flowers: April-May
Astragalus cicerchickpea milk-vetch
Distribution: In scattered locations chiefly east of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountain states and in eastern North America.
Habitat: Roadsides, fields, dry slopes, and other disturbed areas, often where moist or wet.
Origin: Introduced from Europe
Flowers: July-August
Astragalus collinushill milk-vetch, hillside milk-vetch
Distribution: Occurring east of the Cascades crest in Washington; southern British Columbia 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: Endemic to east of the Cascades crest in south-central Washington.
Habitat: Dry, open areas in shrub-steppe.
Origin: Native
Flowers: April-May
Astragalus conjunctusbasalt milk-vetch, stiff milk-vetch
Distribution: Occurring east of the Cascades crest from south-central to southeastern Washington; Washington to southeast Oregon and adjacent southwestern Idaho.
Habitat: Sagebrush grasslands to brushy slopes and ponderosa pine forest openings.
Origin: Native
Flowers: May-July
var. rickardii – stiff milk-vetch
Astragalus cusickiiCusick's milk-vetch
Distribution: Occurring in the southeastern corner in Washington; Washington to northeastern Oregon, east to central Idaho.
Habitat: Sagebrush plains to grassy or rocky slopes, often on talus.
Origin: Native
Flowers: May-July
var. cusickii – Cusick's milk vetch
Astragalus diaphanusJohn Day milk-vetch, transparent milk-vetch
Distribution: Known historically from Klickitat County in Washington, but now thought to be extirpated; Klickitat County, Washington south to Wheeler and Grant counties in Oregon.
Habitat: Gravel bars, alluvial slopes, and in thin gravelly soil overlying basaltic rock.
Origin: Native
Flowers: May-June
Astragalus eucosmuselegant milk-vetch
Distribution: Known only from Okanogan County in Washington; Alaska to Montana and east-central Idaho, Wyoming, Utah, and Colorado, east to northeastern North America.
Habitat: Montane forests and meadows.
Origin: Native
Flowers: May-June
Astragalus falcatusRussian milk-vetch, sickle milk-vetch
Distribution: Known from Whitman County in Washington; British Columbia to Washington and Montana, also in a few scattered locations across North America.
Habitat: Disturbed, open areas.
Origin: Introduced from Eurasia
Flowers: July
Astragalus filipesbasalt milk-vetch
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to northeast California, east to Nevada and Idaho.
Habitat: Sagebrush plains and lower foothills.
Origin: Native
Flowers: May-June
Astragalus geyeriGeyer's milk-vetch
Distribution: Occurring east of the Cascades crest in south-central Washington; southeastern Oregon to Nevada and California, east to Montana, Wyoming, and Utah, disjunct in British Columbia and along Columbia River of Washington and north-central Oregon.
Habitat: Sandy desert areas, especially on dunes.
Origin: Native
Flowers: June-July
var. geyeri – Geyer's milk-vetch
Astragalus hoodianusHood River milk-vetch
Distribution: Occurring in the east end of the Columbia River Gorge in Klickitat County in Washington; Klickitat County, Washington to Hood River and Wasco counties in Oregon.
Habitat: Dry, open areas in sagebrush and grasslands.
Origin: Native
Flowers: April-June
Astragalus howelliiHowell's milk-vetch
Distribution: Occurring in the southeastern corner in Washington; southeastern Washington to north-central Oregon.
Habitat: Stony hillsides among sagebrush and bunchgrass, often over basalt.
Origin: Native
Flowers: Arpil-June
Astragalus inflexusbent milk-vetch, hairy milk-vetch
Distribution: Occurring east of the Cascades crest in Washington; south-central Washington to Oregon, east to Idaho and Montana.
Habitat: Dry hillsides in sagebrush desert.
Origin: Native
Flowers: April-July
Astragalus kentrophytathistle milk-vetch, spiny milk-vetch
Distribution: Known historically from Walla Walla County but considered extirpated; southern Alberta to east-central California, east to Rocky Mountains and northern Great Plains.
Habitat: Sandy deserts to alpine ridges.
Origin: Native
Flowers: July-September
var. douglasii – spiny millk-vetch, thistle milk-vetch
Astragalus laxmanniiLaxmann's milk-vetch, standing milk-vetch
Distribution: Occurring in north-central and eastern Washington; Yukon Territory to Washington, east to the Rocky Mountains and Minnesota.
Habitat: Prairies to rocky foothills in sagebrush desert and ponderosa pine forest.
Origin: Native
Flowers: June-August
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 lentiginosusfreckled milk-vetch, specklepod milk-vetch
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to Montana and Texas.
Habitat: Open areas, desert flats to subalpine slopes.
Origin: Native
Flowers: April-July
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: Occurring in the northeastern counties of Washington; southern British Columbia to Washington, east to Montana and Wyoming.
Habitat: Prairies and foothills to ponderosa pine forests.
Origin: Native
Flowers: May-July
Astragalus miselluspauper milk-vetch
Distribution: Occurring east of the Cascades crest in Washington; Washington to Oregon.
Habitat: Dry, open areas in shrub-steppe.
Origin: Native
Flowers: April-June
var. pauper – pauper milk-vetch
Astragalus miserweedy milk-vetch
Distribution: Occurring east of the Cascades crest in Washington; southern British Columbia to central Washington, Rocky Mountains and northern Great Plains.
Habitat: Grasslands and foothills to montane forests, dry ridges and occasionally alpine meadows.
Origin: Native
Flowers: April-July
var. miser – weedy milk-vetch
var. serotinus – weedy milk-vetch
Astragalus pulsiferaeAmes's milk-vetch
Distribution: Known only from Mt. Adams and Klickitat County in Washington; Occurring in the northern Sierra Nevada of California and adjacent Nevada; not reported from Oregon.
Habitat: Sandy and gravelly flats in sagebrush and open pine forests on basalt.
Origin: Native
Flowers: June-July
var. suksdorfii – Ames's milk-vetch
Astragalus purshiiPursh's milk-vetch, woolly-pod milk-vetch
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and northern Great Plains.
Habitat: Prairies and sagebrush deserts, foothills and lower mountains.
Origin: Native
Flowers: April-June
var. glareosus – woolly-pod milk-vetch
var. purshii – Pursh's milk-vetch, woolly-pod milk-vetch
Astragalus reventiformisYakima milk-vetch
Distribution: Occurring east of the Cascades crest in Washington; Washington to Sherman County in Oregon.
Habitat: Shrub-steppe to low, dry, open ponderosa pine forests.
Origin: Native
Flowers: April-June
Astragalus reventusBlue Mts. milk-vetch, longleaf milk-vetch
Distribution: Occurring east of the Cascades crest in the southeastern counties in Washington; Washington to northeastern Oregon.
Habitat: Pondersoa pine forest openings at low to moderate elevations.
Origin: Native
Flowers: April-June
Astragalus ripariusPiper's milk-vetch
Distribution: Occurring east of the Cascades crest in the southeastern counties in Washington; southeastern WA east to adjacent Idaho.
Habitat: Dry bluffs and canyon banks.
Origin: Native
Flowers: May-June
Astragalus robbinsiiRobbins's milk-vetch
Distribution: Occurring east of the Cascades crest in the northern counties in Washington; Alaska to Oregon,east to Alberta and south in the Rocky Mountains to Colorado, also in eastern North America.
Habitat: Stream banks and alpine slopes.
Origin: Native
Flowers: June-August
var. minor – Robbin's milk-vetch
Astragalus sclerocarpusstalked-pod milk-vetch, The Dalles milk-vetch, woody-pod milk-vetch
Distribution: Occurring east of the Cascades crest chiefly in the Columbia River Basin and Columbia River Gorge in Washington; south-central British Columbia to north-central Oregon.
Habitat: Dunes and sandy barrens, low elevation
Origin: Native
Flowers: May-June
Astragalus sheldoniiSheldon's milk-vetch
Distribution: Occurring east of the Cascades crest in Asotin County in Washington; southeastern Washington to Oregon, east to Idaho.
Habitat: Shrub-steppe and ponderosa pine forest openings.
Origin: Native
Flowers: April-June
Astragalus sinuatusWhited's milk-vetch
Distribution: Endemic to Chelan County in Washington.
Habitat: Among sagebrush on rocky hillsides.
Origin: Native
Flowers: May
Astragalus spaldingiiSpalding's milk-vetch
Distribution: Occurring east of the Cascades crest in Washington; 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 south to Klickitat County, east to Grant 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
Distribution: Disjunct in Douglas County in Washington; Yukon to southeastern Oregon and Nevada, east to Rocky Mountains.
Habitat: Prairies and foothills to lower mountains.
Origin: Native
Flowers: May
Astragalus tweedyiTweedy's milk-vetch
Distribution: Occurring east of the Cascades crest in Washington, from Yakima County south; central Washingtonto north-central Oregon near the Columbia River and lower Deschutes River.
Habitat: Sagebrush plains and foothills.
Origin: Native
Flowers: May-June
Astragalus whitneyiballoon milk-vetch
Distribution: Occurring east of the Cascades crest in Washington; central 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 from Eurasia
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 senna
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east across the southwest to the Great Plains; northeastern North America.
Habitat: Disturbed open areas ncluding wastelots, roadsides, and fields.
Origin: Introduced from Eurasia
Flowers: May-June
Cytisus multiflorusportuguese broom, white Spanish broom
Distribution: Occurring west of the Cascades crest in Washington; Washington to California.
Origin: Introduced from Europe
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 from Europe
Flowers: April-June
Cytisus striatusFrench broom
Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; Washington to California.
Habitat: Disturbed open areas including roadsides and wastelots.
Origin: Introduced from Europe
Flowers: May-June
Dalea ornataBlue Mountain prairie-clover
Distribution: Occurring east of the Cascades crest in central and southeastern Washington\' Washington 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; noxious.
Origin: Introduced from Eurasia
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 from Europe
Flowers: April-June
Genista monspessulanaFrench broom
Distribution: Occurring in scattered locations west of the Cascades crest in Washington; southwestern British Columbia to California, also in western Idaho.
Habitat: Waste areas, roadsides, and other disturbed open areas.
Origin: Introduced from Europe
Flowers: June-July
Genista tinctoriadyer's greenweed
Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; Washington, Idaho, and in eastern North America.
Habitat: Roadsides, wastelots, and other disturbed open areas.
Origin: Introduced
Flowers: May-June
Gleditsia triacanthoshoney locust
Distribution: Occurring east of the Cascades crest in Washington; native to central and eastern 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 from central and eastern North America
Flowers: April-June
Glycyrrhiza lepidotaAmerican licorice, wild licorice
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to Ontario and Texas.
Habitat: Stream and riverbanks, riparian corridors, and other wet areas, often associated with disturbance.
Origin: Native
Flowers: May-August
Hedysarum occidentalewestern sweet-vetch
Distribution: Occurring in the Olympic Mountains in Washington; British Columbia to Washington, Idaho and Utah, east to Alberta, Montana, Wyoming, and Colorado.
Habitat: Alpine and subalpine meadows.
Origin: Native
Flowers: June-August
var. occidentale – western sweet-vetch
Hedysarum sulphurescensyellow sweet-vetch
Distribution: Occurring east of the Cascades crest in north-central and northeastern Washington; British Columbia to Washington, east to Alberta, Montana, and Wyoming, also reported from northeastern Oregon.
Habitat: Open forested areas.
Origin: Native
Flowers: June-August
Hosackia crassifoliabig deervetch
Distribution: Occurring chiefly west of the Cascades in Washington; Washington to California.
Habitat: Moist woods and along streams, from sea level to moderate elevations in the mountains.
Origin: Native
Flowers: May-July
var. crassifolia – big deervetch
Hosackia gracilisseaside bird's-foot-trefoil
Distribution: Occurring west of the Cascades crest in Washington; Washington to California.
Habitat: On moist soil, from near sea level to lower elevations in the mountains.
Origin: Native
Flowers: May-July
Hosackia pinnatameadow bird's-foot-trefoil, meadow deervetch
Distribution: Occurring chiefly west of the Cascades crest and in the Columbia River Gorge in Washington, but also in far eastern Washington; southwestern British Columbia to California, also in western Idaho.
Habitat: Moist areas and wetlands, lowland to montane.
Origin: Native
Flowers: May-July
Hosackia rosearosy bird's-foot-trefoil
Distribution: Occurring west of the Cascades crest in Washington; Washington to California.
Habitat: Moist woods and along streams.
Origin: Native
Flowers: May-July
Laburnum anagyroidisgolden chain-tree
Distribution: Occurring chiefly west of the Cascades crest at low elevations in Washington; British Columbia to California, east to Utah.
Habitat: Forest edge, wastelots, and other disturbed sites often in proximity to residential development where escaped from cultivation.
Origin: Introduced from Europe
Flowers: May-June
Ladeania lanceolatawild lemonweed, lemon scurfpea, lance-leaf scurfpea
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to the Great Plains.
Habitat: Sagebrush steppe habitat in dry areas, often where sandy.
Origin: Native
Flowers: May-June
Lathyrus angulatusangled peavine
Distribution: Occurring east of the Cascades crest in Washington; Washington to California.
Habitat: Roadsides, fields, wastelots, and other disturbed open areas.
Origin: Introduced from Europe
Flowers: May-June
Lathyrus aphacayellow vetchling
Distribution: Known only from San Juan County in Washington; Washington to California, and in scattered locations in central and southern U.S.
Habitat: Roadsides, fields, wastelots, and other disturbed open areas.
Origin: Introduced from Europe
Flowers: May-July
Lathyrus holochlorusthin-leaf vetchling
Distribution: Occurring west of the Cascades crest in southwestern Washington; Washington to Oregon.
Habitat: Woodlands, prairies, pastures, and roadsides.
Origin: Native
Flowers: May-July
Lathyrus japonicusbeach pea
Distribution: Occurring along the Puget Sound and outer coast in Washington; Alaska to California; also along the Atlantic Coast.
Habitat: Sandy beaches, dunes, and headlands along the coast.
Origin: Native
Flowers: May-September
Lathyrus lanszwertiiNevada peavine, thick-leaved peavine
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east to Montana and Utah.
Habitat: Sagebrush-ponderosa pine woodland to moderate elevations in the mountains.
Origin: Native
Flowers: May-June
var. aridus – pinewoods peavine
var. bijugatus – drypark pea
var. lanszwertii – thick-leaved peavine
Lathyrus latifoliuseverlasting peavine, perennial peavine
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east across North America to the Atlantic Coast.
Habitat: Roadsides, ditches, forest edge, and other disturbed areas, usually where somewhat moist.
Origin: Introduced from Europe
Flowers: May-August
Lathyrus littoralisbeach peavine, silky beach vetchling
Distribution: Occurring in the coastal counties in Washington; British Columbia to California.
Habitat: Sand dunes and sandy beaches.
Origin: Native
Flowers: May-July
Lathyrus nevadensisSierra peavine
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia south to California, east to Idaho.
Habitat: Open woods at low to moderate elevations.
Origin: Native
Flowers: May-July
var. cusickii – Cusick's pea
var. nevadensis – Sierra pea
var. parkeri – Parker's Sierra peavine
Lathyrus ochroleucuscream-flowered peavine
Distribution: Occurring east of the Cascades crest along the northern border of Washington; Alaska 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 peavine
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 pauciflorusfew-flowered peavine
Distribution: Occurring chiefly east of the Cascades crest in Washington; Washington 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 peavine
Distribution: Occurring west of the Cascades crest in lowland Washington, and east up the Columbia River Gorge; Washington to California.
Habitat: Prairies and open areas of low mountains.
Origin: Native
Flowers: May-July
Lathyrus sphaericusgrass peavine
Distribution: Occurring along the southern border of Washington; British Columbia to California.
Habitat: Fields, roadsides, ditches, and other disturbed open areas.
Origin: Introduced
Flowers: May-June
Lathyrus sylvestrisnarrow-leaf peavine
Distribution: Occurring chiefly west of the Cascades in Washington; British Columbia to Oregon, east to the Rocky Mountains, also in eastern North America
Habitat: Roadsides and waste places at low elevations.
Origin: Introduced from Europe
Flowers: May-July
Lathyrus torreyiTorrey's peavine
Distribution: Occurring west of the Cascades crest in Washington; Washington to California.
Habitat: Open prairies and clearings in the woods at low elevations.
Origin: Native
Flowers: May-July
Lathyrus tuberosustuberous pea, earth-nut peavine
Distribution: Known from Okanogan County in Washington; Washington and Montana, also in eastern North America.
Origin: Introduced from Eurasia
Flowers: May-July
Lathyrus vestitusPacific peavine
Distribution: Occurring west of the Cascades crest in Washington; Washington to California.
Habitat: Moist woodlands, open slopes, and roadsides.
Origin: Native
Flowers: April-June
var. ochropetalus – Pacific peavine
Lotus corniculatusbird's-foot trefoil, garden bird's-foot trefoil
Distribution: Occurring on both sides of the Cascades crest in Washington; widely distributed throughout most of North America.
Habitat: Open, mesic to wet areas, typically where disturbed.
Origin: Introduced
Flowers: May-September
Lotus tenuisnarrowleaf bird's-foot trefoil, narrowleaf trefoil, slender trefoil
Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; British Columbia to California, east to the Great Plains, also in eastern North America.
Habitat: Fields, roadsides, wastelots, and other disturbed areas
Origin: Introduced from Eurasia
Flowers: May-July
Lotus uliginosuslarge bird's-foot trefoil, big lotus, big trefoil
Distribution: Occurring west of the Cascades crest in Washington; British Columbia 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 from Europe
Flowers: May-July
Lupinus albicaulissicklekeel lupine
Distribution: Occurring west of the Cascades crest in Washington; Washington to California, and in western Nevada.
Habitat: Lowland prairies, grasslands, meadows, and open areas.
Origin: Native
Flowers: May-July
Lupinus arboreustree lupine, yellow bush lupine
Distribution: Occurring west of the Cascades crest in Washington in the lowlands and along the Pacific coast; British Columbia to California.
Habitat: Sandy soil at low elevations, often where disturbed.
Origin: Introduced from California, where native
Flowers: May-September
Lupinus arbustuslongspur lupine, spurred lupine
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to Montana and Utah.
Habitat: Sagebrush deserts and ponderosa pine forest openings.
Origin: Native
Flowers: May-July
Lupinus argenteussilvery lupine
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains and Great Plains.
Habitat: Sagebrush plains, and ponderosa pine forests to subalpine ridges.
Origin: Native
Flowers: May-July
var. argenteus – silvery lupine
Lupinus bicolorfield lupine, small-flowered lupine, two-color lupine
Distribution: Occurring chiefly west of the Cascades crest in Washington, but also in the southeastern part of state; British Columbia to California, east to Arizona.
Habitat: Open meadows, grasslands, prairies, and sandy riverbanks at low to moderate elevations.
Origin: Native
Flowers: April-July
Lupinus latifoliusbroadleaf lupine
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California.
Habitat: Lowland prairies to subalpine meadows and alpine ridges.
Origin: Native
Flowers: June-August
var. latifolius – broadleaf lupine
var. subalpinus – broadleaf lupine
Lupinus lepidusprairie lupine
Distribution: Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains.
Habitat: Open areas from lowland prairies and sagebrush flats to alpine ridges.
Origin: Native
Flowers: June-August
var. aridus – prairie lupine
var. lepidus – Pacific lupine
var. lobbii – elegant lupine
var. utahensis – prairie lupine
Lupinus leucophyllusvelvet lupine
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to Montana, Wyoming, and Utah.
Habitat: Sagebrush plains, grasslands, and ponderosa pine forest openings.
Origin: Native
Flowers: June-August
var. leucophyllus – velvet lupine
var. tenuispicus – velvet lupine
Lupinus littoralisseashore lupine
Distribution: Occurring in the coastal counties in Washington; along the immediate coast from British Columbia to California.
Habitat: Immediate coastline in dunes and on beaches.
Origin: Native
Flowers: May-August
var. littoralis – seashore lupine
Lupinus microcarpuschick lupine
Distribution: Occurring chiefly west of the Cascades in Washington; British Columbia to California.
Habitat: Coastal bluffs, grassy balds, and other dry to moist, open areas at low elevations.
Origin: Native
Flowers: April-June
var. microcarpus – chick lupine
Lupinus nootkatensisNootka lupine
Distribution: Reported from northwest area of Washington; Alaska and Yukon Territory to Vancouver Island, British Columbia.
Habitat: Mesic meadows, stream banks, thickets, and forest openings.
Origin: Introduced from British Columbia
Flowers: May-June
Lupinus oreganusKincaid's lupine, Oregon lupine
Distribution: Occurring west of the Cascades crest in southwestern Washington; southwestern Washington to the Willamette Valley in Oregon, also known historically from Vancouver Island.
Habitat: Moist to dry areas of prairies and openings in oak woodlands.
Origin: Native
Flowers: April-June
var. kincaidii – Kincaid's lupine, Oregon lupine
Lupinus pachylobusbig-pod lupine
Distribution: Occurring in San Juan County in Washington; disjunct in the Gulf Islands of Canada and San Juan Islands of Washington, otherwise in California.
Habitat: Rocky balds and dry slopes
Origin: Native?
Flowers: April-June
Lupinus polyphyllusbigleaf lupine, large-leaved lupine
Distribution: Widely distributed throughout Washington; British Columbia to California, east to Colorado.
Habitat: Moist areas and stream banks, lowlands to subalpine and alpine areas.
Origin: Native
Flowers: June-September
var. burkei – large-leaved lupine, many-leaved lupine
var. humicola – Wyeth's lupine
var. pallidipes – large-leaved lupine
var. polyphyllus – large-leaved lupine
var. prunophilus – large-leaved lupine
Lupinus pusilluslow lupine, rusty lupine
Distribution: Occurring east of the Cascades crest in south-central Washington; Washington to California, east to the Rocky Mountains and Great Plains.
Habitat: Sagebrush desert, often where sandy.
Origin: Native
Flowers: May-June
var. intermontanus – low lupine, rusty lupine
Lupinus rivularisriver bank lupine, stream bank lupine
Distribution: Occurring west of the Cascades crest in Washington; British Columbia to California.
Habitat: Gravelly prairies, open woods and riverbanks at low elevations.
Origin: Native
Flowers: April-September
Lupinus sabinianusSabin's lupine
Distribution: Occurring in the Blue Mountains of southeastern Washington; southeastern Washington to adjacent northeastern Oregon.
Habitat: Ponderosa pine 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 to California, east to Idaho and Nevada.
Habitat: Mostly on basaltic rimrock in sagebrush desert or pine woodland.
Origin: Native
Flowers: April-May
Lupinus sericeussilky lupine
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to Oregon, east to Alberta and Rocky Mountains.
Habitat: Sagebrush deserts to forest openings at moderate elevations.
Origin: Native
Flowers: May-August
var. asotinensis – Asotin silk lupine
var. sericeus – silky lupine
Lupinus sulphureussulfur lupine
Distribution: Occurring east of the Cascades crest in Washington; southern British Columbia to central Oregon, possibly east to adjacent Idaho.
Habitat: Shrub-steppe, grassland, and open ponderosa pine forests.
Origin: Native
Flowers: April-June
var. sulphureus – sulphur lupine
Medicago arabicaspotted medic
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia to California, also in the southeastern U.S.
Habitat: Disturbed areas including wastelots, roadsides and fields.
Origin: Introduced from Eurasia
Flowers: April-July
Medicago lupulinahop clover, black medic
Distribution: Widely distributed throughout Washington; widely distributed throughout much of North America.
Habitat: Roadsides, fields, lawns, wastelots, and other disturbed areas, often on sandy or gravelly soil.
Origin: Introduced from Eurasia
Flowers: April-August
Medicago minimalittle bur-clover, bur medic
Distribution: Occurring in the east end of the Columbia River Gorge in Washington; Washington to California, east along the southern U.S. to eastern North America, also in the Hells Canyon area in Idaho.
Habitat: Roadsides, wastelots, and other disturbed, open areas.
Origin: Introduced from Eurasia
Flowers: March-June
Medicago polymorphabur-clover, toothed medic, smooth medic
Distribution: Occurring chiefly west of the Cascades crest in Washington; southwestern British Columbia to California, scattered eastward across much of North America.
Habitat: Waste ground and disturbed areas, mostly at low elevations.
Origin: Introduced
Flowers: March-June
Medicago sativaalfalfa, lucerne
Distribution: Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east to the Atlantic Coast.
Habitat: Roadsides, fields, wastelots, and other disturbed, open areas; often escaping from commercial cultivation.
Origin: Introduced
Flowers: May-October
ssp. falcata – yellow alfalfa
ssp. sativa – alfalfa, lucerne
ssp. ×varia – alfalfa
Melilotus albuswhite sweet-clover
Distribution: Widely distributed on both sides of the Cascades crest in Washington; widely distributed across most of North America.
Habitat: Roadsides, fields, wastelots, and other disturbed open areas at low to middle elevations.
Origin: Introduced from Eurasia
Flowers: May-October
Melilotus indicusannual yellow sweet-clover, small-flowered yellow sweet-clover
Distribution: Occurring west of the Cascades crest in Washington; British Columbia to California, east to Idaho, Utah, and Nevada, further east across the southern U.S. and in eastern North America.
Habitat: Roadsides, fields, wastelots, and other disturbed open areas.
Origin: Introduced from Eurasia
Flowers: May-July
Melilotus officinalisyellow sweet-clover
Distribution: Widely distributed on both sides of the Cascades crest in Washington; widely distributed throughout North America.
Habitat: Roadsides, fields, wastelots, and other disturbed open areas.
Origin: Introduced from Eurasia
Flowers: May-September
Onobrychis viciifoliaholy-clover, saintfoin, sandfain
Distribution: Occurring east of the Cascades crest in Washington; Alaska to California, east to the Great Plains, also in eastern North America,
Habitat: Roadsides, fields, wastelots, and other disturbed areas.
Origin: Introduced
Flowers: June-August
Ononis spinosarestharrow
Distribution: Known from Klickitat County in Washington; south-central Washington to adjacent Oregon, also in scattered locations in eastern North America.
Origin: Introduced from Europe
Flowers: June-August
ssp. maritima – common restharrow
Oxytropis borealisboreal crazyweed, boreal locoweed
Distribution: Occurring in the Olympic Mountains in Washington; Alaska to California, east to Rocky Mountains, also in eastern Canada.
Habitat: Subalpine and alpine areas.
Origin: Native
Flowers: June-August
var. viscida – sticky boreal crazyweed, sticky boreal locoweed
Oxytropis campestrisfield locoweed, yellow locoweed
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to Oregon, east across the northern U.S. and Canada to the Atlantic Coast.
Habitat: Forest openings and rocky balds from sea-level to the alpine.
Origin: Native
Flowers: May-July
var. columbiana – slender crazyweed
var. cusickii – Cusick's field crazyweed, Cusick's field locoweed
var. spicata – yellow-flowered crazyweed, yellow-flowered locoweed
var. wanapum – Wanapum crazyweed, Wanapum locoweed
Oxytropis deflexapendent-pod crazyweed, pendent-pod locoweed
Distribution: Occurring east of the Cascades crest in north-central Washington; Alaska to California, east to the Rocky Mountains, and east across Canada to the Atlantic Coast.
Habitat: Montane forest openings and meadows to the subalpine and alpine.
Origin: Native
Flowers: June-August
var. sericea – pendent-pod crazyweed, pendent-pod locoweed
Pisum sativumgarden pea
Distribution: Occurring in scattered locations across Washington; British Columbia to California, east across America in scattered locations.
Habitat: Roadsides, fields, wastelots, and other disturbed areas where escaped from cultivation.
Origin: Introduced
Flowers: May-September
Pueraria montanakudzu
Distribution: Not currently known to occur in Washington; also reported for Oregon, otherwise widespread in eastern North America, especially southeastern U.S.
Habitat: Disturbed, open areas and forest edge.
Origin: Introduced
Flowers: May-June
Robinia hispidabristly locust
Distribution: Occurring in scattered locations on both sides of the Cascades crest; introduced from British Columbia to California, native from the Great Plains to eastern North America.
Habitat: Forest edge, roadsides, wastelots, and other disturbed areas.
Origin: Introduced from central and eastern North America
Flowers: May-July
Robinia pseudoacaciablack locust
Distribution: Occurring on both sides of the Cascades crest in Washington; introduced from Alaska to California, east to the Rocky Mountains, native from the Great Plains to eastern North America.
Habitat: Stream and river banks, forest edge, wastelots, abandoned homesteads, and disturbed areas.
Origin: Introduced from central and eastern North America
Flowers: May-June
Rupertia physodesforest scurfpea, California tea
Distribution: Occurring west of the Cascades crest in Washington; British Columbia to California, disjunct in northeastern Oregon and adjacent Idaho.
Habitat: Prairie and forest edges at low elevations.
Origin: Native
Flowers: May-June
Securigera variacrown vetch, purple crown vetch
Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; British Columbia to California, east across North America.
Habitat: Roadsides, fields, wastelots, and other disturbed areas.
Origin: Introduced from Eurasia
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, alkali swainsonpea
Distribution: Occurring east of the Cascades in Washington, chiefly in the central part of the state; Washington to California, east to the Great Plains.
Habitat: Alkaline soil at low elevations, often where disturbed.
Origin: Introduced
Flowers: May-July
Thermopsis montanamountain buck-bean, mountain golden-banner, mountain golden-pea, mountain thermopsis
Distribution: Occurring on both sides of the Cascades crest in Washington, but only occurring in the far western and eastern counties; British Columbia to California, east to the Rocky Mountains.
Habitat: Sandy, well-drained soil to wet meadowland, low to moderate elevations.
Origin: Native
Flowers: May-July
var. ovata – slender goldenbanner
Trifolium albopurpureumRancheria clover
Distribution: Known from only a few scattered locations in Klickitat County in Washington; south-central Washington to California, east to Arizona.
Habitat: Cliffs, balds, and forest openings at low to moderate elevations.
Origin: Native
Flowers: May-June
Trifolium arvenserabbitfoot clover, hare's foot
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia to California, east to Montana, further eastward across the northern U.S. and southern Great Plains and Canada to eastern North America.
Habitat: Roadsides, fields, wastelots, and other disturbed open areas.
Origin: Introduced
Flowers: May-July
Trifolium aureumgolden clover, greater hop clover, yellow clover
Distribution: Occurring chiefly west of the Cascades crest in Washington; Alaska to California, east to Montana and Wyoming; also occurring in most of eastern North America.
Habitat: Roadsides, fields, lawns, railways, wastelots, and other disturbed open sites.
Origin: Introduced
Flowers: June-September
Trifolium bifidumnotch-leaf clover, Pinole clover
Distribution: Occurring in Klickitat County in Washington; south-central Washington to California.
Habitat: Open woodlands and grassy slopes.
Origin: Native
Flowers: April-June
var. decipiens – notchleaf clover, Pinole clover
Trifolium campestrefield clover, hop clover
Distribution: Occurring chiefly west of the Cascades in Washington; Alaska to California, east across most of North America to the Atlantic Coast.
Habitat: Wastelots, roadsides, fields, meadows, and other disturbed areas.
Origin: Introduced from Europe
Flowers: May-August
Trifolium cernuumnodding clover
Distribution: Known from the Olympic Peninsula in Washington; Washington to California.
Habitat: Roadsides, lawns, fields, and other disturbed open areas at low elevations.
Origin: Introduced
Flowers: April-May
Trifolium ciliolatumfoothill clover, tree clover
Distribution: Occurring east of the Cascades crest in south-central Washington; south-central Washington to California.
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 crest in Washington; British Columbia to California, east to western Montana and Nevada.
Habitat: Wet meadows and seeps to fairly dry, sandy soil, at moderate elevations.
Origin: Native
Flowers: May-July
Trifolium depauperatumpoverty clover
Distribution: Occurring west of the Cascades crest in northwestern Washington; also in Gulf Islands and Vancouver Islands in British Columbia, otherwise southwestern Oregon to southern California.
Habitat: Coastal bluffs and vernally moist areas.
Origin: Native
Flowers: April-June
var. depauperatum – poverty clover
Trifolium dichotomumbranched clover
Distribution: Occurring west of the Cascades crest in the San Juan Islands in Washington; southern Vancouver Island, Gulf Islands, and San Juan Islands, otherwise Willamette Valley, Oregon to California.
Habitat: Open forest, sandy embankments, and grassy balds on islands.
Origin: Native
Flowers: April-June
Trifolium douglasiiDouglas's clover
Distribution: Occurring east of the Cascades crest in eastern and southeastern Washington; eastern Washington to east-central Oregon, east to eastern Idaho.
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 chiefly west of the Cascades crest in Washington; Alaska to California, east across much of North America to the Atlantic Coast.
Habitat: Forest openings, roadsides, fields, lawns, wastelots, and other disturbed sites.
Origin: Introduced from Europe
Flowers: April-September
Trifolium eriocephalumwoolly-head clover
Distribution: Occurring on both sides of the Cascades crest in southern Washington; southern Washington to California, east to Montana, Utah, and Nevada.
Habitat: Meadows and forest openings at middle elevations in the mountains.
Origin: Native
Flowers: May-July
var. arcuatum – woolly-head clover
var. eriocephalum – woolly-head cloover
Trifolium fragiferumstrawberry clover
Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; southern British Columbia to California, east to the Great Plains, also in eastern North America.
Habitat: Roadsides, fields, lawns, wastelots and other disturbed places.
Origin: Introduced from Europe
Flowers: April-July
Trifolium glomeratumclustered clover
Distribution: Occurring west of the Cascades crest in the Puget Trough lowlands; southwestern British Columbia to California.
Habitat: Roadsides, lawns, and other disturbed sites often with dry, gravelly, compacted soil.
Origin: Introduced from Europe
Flowers: April-June
Trifolium gracilentumslender clover
Distribution: Occurring chiefly west of the Cascades crest and in the Columbia River Gorge in Washington; Washington to California, where native, and east to Arizona.
Habitat: Grassy slopes, fields, and roadsides.
Origin: Introduced from California
Flowers: April-June
Trifolium hirtumrose clover
Distribution: Occurring in the Columbia River Gorge in Washington; Washington to California, also in the southeastern U.S.
Habitat: Roadsides, fields, wastelots, and other disturbed areas.
Origin: Introduced from Europe
Flowers: April-June
Trifolium hybridumalsike clover
Distribution: Occurring on both sides of the Cascades crest throughout much of Washington; Alaska to California, east across most of North America to the Atlantic Coast.
Habitat: Roadsides, fields, meadows, wastelots, and other disturbed open areas.
Origin: Introduced from Europe
Flowers: April-September
Trifolium incarnatumcrimson clover
Distribution: Occurring west of the Cascades crest in the Puget Trough lowlands; British Columbia to California, east across much of North America to the Atlantic Coast.
Habitat: Roadsides, fields, meadows, wastelots, and other disturbed open areas.
Origin: Introduced from Europe
Flowers: April-June
Trifolium latifoliumtwin clover
Distribution: Occurring east of the Cascades crest in far eastern and southeastern Washington; eastern Washington to northeastern Oregon, east to western Montana.
Habitat: Moist meadows to rocky ridges.
Origin: Native
Flowers: June-August
Trifolium longipeslong-stalked clover
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia 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
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 the Rocky Mountains.
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: Occurring chiefly west of the Cascades crest and in the Columbia River Gorge in Washington; British Columbia to California; also in South America.
Habitat: In meadows or on rocky or sandy soil at low elevations.
Origin: Native
Flowers: April-June
Trifolium oliganthumfew-flowered clover
Distribution: Occurring west of the Cascades crest in Washington; southwestern British Columbia to California.
Habitat: Balds, grasslands, and prairies at low elevations, often where dry and rocky.
Origin: Native
Flowers: April-June
Trifolium plumosumplumed clover
Distribution: Occurring in the southeastern region in Washington; southeastern Washington to northeastern Oregon, east to adjacent Idaho.
Habitat: Dry hillsides, meadowlands, and forest openings.
Origin: Native
Flowers: May-August
var. amplifolium – plumed clover
var. plumosum – plumed clover
Trifolium pratensered clover
Distribution: Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.
Habitat: Escaped from cultivation; found along mountain trails where horses have been used
Origin: Introduced from Europe
Flowers: June-August
Trifolium repensDutch clover, white clover
Distribution: Widely distributed throughout Washington; Alaska to California, east across North America to the Atlantic Coast.
Habitat: Roadsides, fields, lawns, meadows, wastelots, trailsides, and other disturbed open areas from low elevations to the subalpine.
Origin: Introduced from Europe
Flowers: April-September
Trifolium resupinatumreversed clover
Distribution: Occurring east of the Cascades crest in eastern Washington; eastern Washington to California, also in eastern North America.
Habitat: Roadsides, wastelots, and disturbed open areas.
Origin: Introduced from Eurasia
Flowers: May-June
Trifolium retusumteasel clover
Distribution: Occurring west of the Cascades crest in the Puget Trough region in Washington; also occurring in southern Oregon and northern California.
Habitat: Roadsides, fields, meadows, lawns, wastelots, and other disturbed open areas at low elevations.
Origin: Introduced from Europe
Flowers: April-June
Trifolium striatumknotted clover
Distribution: Occurring in lowlands west of the Cascades crest in Washington; Washington to California, also in eastern North America.
Habitat: Disturbed, open areas at low elevation.
Origin: Introduced from Europe
Flowers: April-June
Trifolium subterraneumburrowing clover, subterranean clover, subterranean trefoil
Distribution: Occurring west of the Cascades crest in Washington; British Columbia to California; also in the southeastern U.S.
Habitat: Pastures, prairies, roadsides, lawns, fields, and other open disturbed areas at low elevations.
Origin: Introduced from Europe
Flowers: April-June
Trifolium suffocatumsuffocated clover
Distribution: Occurring west of the Cascades crest in Washington; Washington and in California
Habitat: Roadsides, fields, wastelots, lawns, and other disturbed areas.
Origin: Introduced from Europe
Flowers: April-June
Trifolium thompsoniiThompson's clover
Distribution: Endemic to Chelan and Douglas counties in Washington.
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 to Montana, Wyoming, Utah, and Arizona.
Habitat: Dry, sandy soil to moist meadows.
Origin: Native
Flowers: April-July
Trifolium vesiculosumarrow-leaf clover
Distribution: Occurring in a few locations west of the Cascades crest in lowland western Washington; Washington to California; also in the south-central and southeastern U.S.
Habitat: Roadsides, fields, wastelots, and other disturbed open areas.
Origin: Introduced from Europe
Flowers: May-July
Trifolium willdenoviisand clover, tomcat clover
Distribution: Occurring west of the Cascades crest and east along the Columbia River in Washington; British Columbia 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: Occurring chiefly west of the Cascades crest in Washington; Alaska to California, east to Idaho, Colorado, and New Mexico.
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 to California; also in the eastern U.S.
Habitat: Roadsides, dry hillsides, fields, and other disturbed areas at low elevation.
Origin: Introduced from Europe
Flowers: April-September
Vicia americanaAmerican vetch
Distribution: Widely distributed on both sides of the Cascades crest throughout much of Washington; Alaska to California, east across North America, except in the southeastern U.S., to the Atlantic Coast.
Habitat: Moist forest openings, forest edge, thickets, meadows, prairies, and disturbed areas.
Origin: Native
Flowers: May-July
var. americana – American vetch
Vicia craccatufted vetch, bird vetch
Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; British Columbia to California, in scattered locations elsewhere in North America.
Habitat: Roadsides, fields, meadows, wastelots, and other disturbed open areas.
Origin: Introduced from Europe
Flowers: May-July
Vicia hirsutahairy vetch, tiny vetch
Distribution: Occurring west of the Cascades crest and east in the Columbia River Gorge in Washington; Alaska to California, also in Idaho and Montana.
Habitat: Roadsides, forest edge, meadows, thickets, wastelots, and other disturbed open areas.
Origin: Introduced from Europe
Flowers: April-July
Vicia lathyroidesspring vetch
Distribution: Occurring west of the Cascades crest in the Puget Sound lowlands in Washington; British Columbia to California; also in southeastern U.S.
Habitat: Roadsides, fields, wastelots, and other disturbed areas.
Origin: Introduced from Europe
Flowers: April-June
Vicia luteayellow vetch
Distribution: Occurring west of the Cascades crest in the Puget Trough in Washington; Washington to California, also in the southeastern U.S.
Habitat: Roadsides, fields, lawns, wastelots, and other disturbed open areas.
Origin: Introduced from Eurasia
Flowers: April-June
Vicia nigricansgiant vetch
Distribution: Occurring west of the Cascades crest in the coastal counties and east in the Columbia River Gorge in Washington; along the coast from Alaska to California, inland to the Willamette Valley in Oregon.
Habitat: Beach margins and headlands, forest openings, and along streams near the coast.
Origin: Native
Flowers: May-July
var. gigantea – giant vetch
Vicia pannonicaHungarian vetch
Distribution: Occurring west of the Cascades crest in the Puget Trough in Washington; Washington to California.
Habitat: Roadsides, fields, wastelots, and other disturbed open areas.
Origin: Introduced from Eurasia
Flowers: May-June
Vicia sativatare, common vetch
Distribution: Occurring on both sides of the Cascades crest and east in the Columbia River Gorge in Washington; Alaska to California, east across most of North America to the Atlantic Coast.
Habitat: Roadsides, fields, forest edges, thickets, lawns, wastelots, and other disturbed open areas.
Origin: Introduced from Eurasia
Flowers: April-July
var. angustifolia – tare, common vetch
var. sativa – common vetch
Vicia tetraspermasmooth tare, lentil vetch, slender vetch
Distribution: Occurring west of the Cascades crest in Washington; southwestern British Columbia to California, also in northern Idaho and western Montana.
Habitat: Roadsides, fields, forest edge, wastelots, and other disturbed areas.
Origin: Introduced from Europe
Flowers: May-August
Vicia villosahairy vetch, winter vetch, woolly vetch
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across most of North America to the Atlantic Coast.
Habitat: Roadsides, meadows, grasslands, prairies, and other disturbed open areas.
Origin: Introduced from Eurasia and North Africa
Flowers: May-September
var. glabrescens – hairy vetch, winter vetch, woolly vetch
var. villosa – hairy vetch, winter vetch, woolly vetch