Ranunculaceae
Buttercup Family
21 genera
94 species
33 subspecies and varieties
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Aconitum columbianumColumbian monkshood
Distribution: Occurring chiefly east of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains.
Habitat: Moist woods and meadows, moderate to subalpine elevations.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
ssp. columbianum – Columbian monkshood
Actaea elatatall bugbane
Distribution: Occurring west of the Cascades crest and in the Columbia River Gorge in Washington; British Columbia to Oregon.
Habitat: Moist, shady woods at low elevations.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
var. elata – tall bugbane
Actaea laciniatacut-leaved bugbane, Mt. Hood bugbane
Distribution: Occurring west of the Cascades crest in southwestern Washington; southwestern Washington to adjacent northwestern Oregon.
Habitat: Moist woods at middle elevations in the mountains.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Actaea rubrabaneberry
Distribution: Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east to the northern Great Plains, Great Lakes region, and northeastern North America.
Habitat: Moist woods and streambanks from low elevations to middle elevations in the mountains.
Origin: Native
Flowers: April-July
Growth Duration: Perennial
Adonis aestivalissummer pheasant's-eye
Distribution: Occurring east of the Cascades crest in Washington; central Washington to California, east to Montana, Idaho, and Utah.
Habitat: Disturbed areas.
Origin: Introduced from Europe
Flowers: May-July
Growth Duration: Annual
Anemone deltoideathreeleaf anemone, Columbian windflower
Distribution: Occurring chiefly west of the Cascades crest and east in the Columbia River Gorge in Washington; Washington to California.
Habitat: Dry to moist woodlands at low to middle elevations.
Origin: Native
Flowers: April-May
Growth Duration: Perennial
Anemone drummondiiDrummond's anemone, Drummond's windflower
Distribution: Occurring in the Olympic and Cascade Mountains in Washington; Alaska to California, east to Montana and Wyoming.
Habitat: Subalpine to alpine meadows.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
var. drummondii – Drummond's anemone, Drummond's windflower
Anemone lyalliilittle mountain anemone, Lyall's anemone, Lyall's windflower
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia to California.
Habitat: Low elevation prairies to subalpine ridges.
Origin: Native
Flowers: March-July
Growth Duration: Perennial
Anemone multifidacliff anemone, Pacific anemone
Distribution: Occurring on both sides of the Cascades crest and in the Olympic Mountains in Washington; Alaska to California, east to the northern Great Plains, Great Lakes region, and northeastern North America.
Habitat: From forest openings in the foothills to alpine meadows.
Origin: Native
Flowers: May-August
Growth Duration: Perennial
var. multifida – cliff anemone, Pacific anemone, Pacific windflower
var. saxicola – hirsute anemone, hirsute windflower
Anemone occidentalismountain pasqueflower, western pasqueflower
Distribution: Occurring in the Olympic and Cascade mountains in Washington; British Columbia to California, east to Alberta, Montana, Idaho, and the Wallowa Mountains of Oregon.
Habitat: Open slopes and meadows from middle elevations to the alpine.
Origin: Native
Flowers: May-August
Growth Duration: Perennial
Anemone oreganaOregon anemone, Oregon windflower
Distribution: Occurring in forested areas on both sides of the Cascades crest in Washington; Washington to northern California.
Habitat: Moist, open woods, low to mid-elevations in the mountains, also in marshes and bogs along the coast.
Origin: Native
Flowers: March-June
Growth Duration: Perennial
var. felix – Oregon anemone, western wood anemone
var. oregana – Oregon anemone, western wood anemone
Anemone parvifloranorthern anemone, small-flowered anemone, northern windflower
Distribution: Occurring on both sides of the Cascades crest in the North Cascades in Washington; Alaska to northern Washington, east to Montana and Wyoming, in scattered locations in Utah and Colorado, and also east across northern Canada to the Atlantic Coast.
Habitat: Mountain meadows and subalpine stream banks.
Origin: Native
Flowers: May-August
Growth Duration: Perennial
Anemone patenspasqueflower, prairie-crocus
Distribution: Occurring east of the Cascades crest in the Wenatchee Mountains in Washington, where disjunct from the main species range Alaska, south in the Rocky Mountains to New Mexico, east to the northern Great Plains and the Great Lakes region, disjunct in the Wenatchee Mountains in Washington.
Habitat: Prairies to mountain slopes, mostly on well-drained soil.
Origin: Native
Flowers: May-August
Growth Duration: Perennial
var. multifida – cliff anemone
Anemone piperiPiper's anemone, Piper's windflower
Distribution: Occurring east of the Cascades crest in Washington in the far eastern part of the state; Washington to northeast Oregon east to Idaho and western Montana.
Habitat: Shady woods at moderate elevations in the mountains.
Origin: Native
Flowers: April-June
Growth Duration: Perennial
Aquilegia flavescensyellow columbine
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to Oregon, east to the Rocky Mountains.
Habitat: Moist mountain meadows and talus to alpine slopes
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Aquilegia formosared columbine, Sitka columbine
Distribution: Widely distributed on both sides of the Cascades crest throughout Washington; Alaska to California, coastal and inland to Alberta and Wyoming.
Habitat: Open woods, from the lowlands to moderate elevations in the mountains.
Origin: Native
Flowers: May-August
Growth Duration: Perennial
var. formosa – red columbine, Sitka columbine, western columbine
Aquilegia ×minianahybrid columbine
Distribution: Occurring east of the Cascades crest in central Washington; British Columbia to Washington, east to Idaho.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Aquilegia vulgarisEuropean Columbine
Distribution: Introduced as a garden flower, occasionally escaping.
Habitat: Disturbed soil near gardens.
Origin: Introduced
Flowers: May-July
Growth Duration: Perennial
Arcteranthis cooleyaeCooley's buttercup
Distribution: Occurring west of the Cascades crest in Washington; Alaska to Washington.
Habitat: Damp slopes and rocky crevices at high elevations, blossoming as snow recedes.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Caltha biflorabroad-leaved marsh-marigold, twin-flowered marsh-marigold
Distribution: Occurring chiefly west of the Cascade crest in Washington; Alaska to California, east to western Nevada.
Habitat: Open wet area in subalpine and alpine marshes and seepages.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Caltha leptosepalaelkslip
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the western Montana.
Habitat: Wet places in subalpine and alpine regions.
Origin: Native
Flowers: May-August
Growth Duration: Perennial
Caltha palustrisyellow marshmarigold
Distribution: Coastal Alaska, south along the coast to Oregon
Habitat: Mostly in coastal bogs
Origin: Both native and introduced populations
Flowers: July-August
Growth Duration: Perennial
Ceratocephala testiculatahornseed buttercup
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Great Plains.
Habitat: Disturbed soil in sagebrush deserts and plains.
Origin: Introduced from Europe
Flowers: March-May
Growth Duration: Annual
Clematis hirsutissimaDouglas's clematis, leatherflower, sugarbowls, vaseflower
Distribution: Occurring east of the Cascades crest in eastern Washington; Washington to Oregon, east to Montana, south to Arizona and New Mexico.
Habitat: Meadows, grasslands, and forest openings.
Origin: Native
Flowers: May-June
Growth Duration: Perennial
var. hirsutissima – Douglas' clematis
Clematis ligusticifoliawestern clematis
Distribution: Chiefly east of the Cascades crest in Washington; British Columbia south to California, east to Oklahoma and the Dakotas.
Habitat: River valleys and sagebrush desert to ponderosa pine forests.
Origin: Native
Flowers: June-September
Growth Duration: Perennial
Clematis occidentalisColumbia clematis, rock clematis, Columbia virgin's bower
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to Oregon, east to Saskatchewan and Wyoming.
Habitat: Often in deep, fine soils in shady forest, also in cliffs and other rocky sites in open woods and thickets, at moderate to high elevations in the mountains.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
var. dissecta – Columbia clematis
var. grosseserrata – Columbia clematis
Clematis orientalisOriental clematis, Oriental virgin's bower
Distribution: Known from Yakima County in Washington; also known from the Columbia River Gorge area in Oregon, and other scattered locations in southwestern North America.
Habitat: Disturbed open areas at low elevations.
Origin: Introduced
Flowers: June-July
Growth Duration: Perennial
Clematis vitalbaevergreen clematis, old-man's beard, traveler's-joy
Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia to Oregon, also in scattered locations in eastern North America.
Habitat: Forest edge, hillsides, parks, wastelots, and other disturbed sites.
Origin: Introduced; native to Europe and Africa
Flowers: June-September
Growth Duration: Perennial
Coptis aspleniifoliafern-leaf goldthread
Distribution: Occurring west of the Cascades crest in Washington; Alaska south along the coast to Washington.
Habitat: Moist woods and bogs at low elevations.
Origin: Native
Flowers: April-May
Growth Duration: Perennial
Coptis laciniataOregon goldthread
Distribution: Occurring west of the Cascades crest from the Olympic Peninsula south in Washington; Washington to California.
Habitat: Moist woods at low elevations.
Origin: Native
Flowers: April-August
Growth Duration: Perennial
Coptis occidentalisIdaho goldthread, western goldthread
Distribution: Occurring east of the Cascades crest in the northeastern region of Washington; adjacent British Columbia to Idaho and Montana.
Habitat: Moist woods.
Origin: Native
Flowers: April-May
Growth Duration: Perennial
Coptis trifoliathreeleaf goldthread
Distribution: Occurring west of the Cascades crest in Washington in the northwest corner of the Olympic Peninsula. Alaska to Washington, Idaho and Montana, east across northern North America to the Atlantic; disjunct in Clackamas County, Oregon; also in Greenland and eastern Eurasia.
Habitat: Deep woodland, often where swampy.
Origin: Native
Flowers: May-August
Growth Duration: Perennial
Delphinium ajacisdoubtful knight's-spur
Distribution: Limited in distribution to a few localities west of the Cascades in Washington; widely distributed throughout much of North America.
Habitat: Drainage ditches, roadsides, old home sites, waste areas.
Origin: Introduced
Flowers: June-July
Growth Duration: Annual
Delphinium basalticumbasaltic larkspur
Distribution: Occurring in the Columbia River Gorge in Washington; southcentral Washington and adjacent Oregon.
Habitat: Basaltic cliff faces, outcropping, and exposed slopes.
Origin: Native
Flowers: May-June
Growth Duration: Perennial
Delphinium ×burkeiBurke's larkspur
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains.
Habitat: Moist meadows and seasonally damp open sagebrush and ponderosa pine forests.
Origin: Native
Flowers: April-June
Growth Duration: Perennial
Delphinium depauperatumslim larkspur
Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to Montana, Idaho, and Nevada.
Habitat: From vernally moist sagebrush valleys to subalpine meadows.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
Delphinium distichumtwo-spike larkspur
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to Oregon, east to Montana and Wyoming.
Habitat: Vernally wet swales and meadows, in sagebrush or ponderosa pine forest.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
Delphinium glareosumOlympic larkspur
Distribution: Occurring in the Olympics and Cascades Range in Washington; British Columbia to Oregon.
Habitat: Alpine and subalpine ridges and talus slopes, sometimes found at lower elevations.
Origin: Native
Flowers: May-August
Growth Duration: Perennial
Delphinium glaucumpale larkspur
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains and the Canadian Great Plains.
Habitat: Meadows and wet thickets, bogs, streambanks, and coniferous forest openings at middle elevations in the mountains.
Origin: Native
Flowers: July-September
Growth Duration: Perennial
Delphinium leucophaeumpale larkspur
Distribution: Occurring west of the Cascades crest in Washington, where known only from Lewis County in Washington; Lewis County, Washington to Willamette Valley, Oregon.
Habitat: Bluffs, open ground, and moist lowland meadows where undisturbed.
Origin: Native
Flowers: May-June
Growth Duration: Perennial
Delphinium lineapetalumline-petaled larkspur
Distribution: Occurring east of the Cascades crest, where endemic to Chelan and Kittitas counties.
Habitat: Meadows and forest edge from lowland valleys to lower mountain slopes.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
Delphinium menziesiiMenzies larkspur
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to Oregon.
Habitat: Coastal bluffs and prairies to moist meadows and forest openings at moderate elevations in the mountains.
Origin: Native
Flowers: April-July
Growth Duration: Perennial
Delphinium multiplexKittitas larkspur
Distribution: Occurring east of the Cascades crest in Washington, where endemic to Chelan, Kittitas, and Yakima counties in Washington.
Habitat: Along rocky, usually intermitant streams or springs in sagebrush hills to moderate elevations in the mountains.
Origin: Native
Flowers: May-August
Growth Duration: Perennial
Delphinium nuttallianumthin-petal larkspur, upland larkspur
Distribution: Occurring chiefly east of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains.
Habitat: Dry, gravelly ground, sagebrush deserts to the ponderosa pine region in the mountains.
Origin: Native
Flowers: March-August
Growth Duration: Perennial
Delphinium nuttalliiNuttall's larkspur
Distribution: Occurring west of the Cascades crest and east in the Columbia River Gorge in Washington; Washington to Willamette Valley, Oregon.
Habitat: Gravelly outwash prairies and basaltic cliffs.
Origin: Native
Flowers: May-June
Growth Duration: Perennial
Delphinium occidentalewestern larkspur
Distribution: Occurring east of the Cascades crest in southeastern Washington; Washington to northeastern Nevada, east to Montana, Wyoming, Colorado, and Utah.
Habitat: Montane meadows and thickets, bogs, and streamsides.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
var. occidentale – western larkspur
Delphinium stachydeumhedge nettle larkspur, spiked larkspur
Distribution: Occurring east of the Cascades crest in southeastern Washington; southeastern Washington to northeast California, east to Idaho and northern Nevada.
Habitat: Dry sagebrush to ponderosa or lodgepole pine forests
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Delphinium sutherlandiiSutherland's larkspur
Distribution: Occurring in northeastern Washington; southeastern British Columbia and adjacent Washington, east across northern Idaho to northwestern Montana.
Habitat: Dry meadows and open conifer forests.
Origin: Native
Flowers: April-June
Growth Duration: Perennial
Delphinium trolliifoliumcow-poison, poison larkspur
Distribution: Occurring west of the Cascades crest and in the Columbia River Gorge in Washington; Washington south to California.
Habitat: Moist, shady woods at low to middle elevations.
Origin: Native
Flowers: April-May
Growth Duration: Perennial
Delphinium viridescensWenatchee larkspur
Distribution: Occurring east of the Cascades crest in Washington, where endemic to the Wenatchee Mountains of Chelan and Kittitas counties.
Habitat: Boggy meadowlands.
Origin: Native
Flowers: June-July
Growth Duration: Perennial
Delphinium xantholeucumyellow-white larkspur
Distribution: Occurring east of the Cascades crest in Washington, where endemic to Okanogan, Chelan, and Douglas counties.
Habitat: Dry, grassy hillsides and ponderosa pine forests.
Origin: Native
Flowers: April-June
Growth Duration: Perennial
Enemion halliiWillamette false rue-anemone
Distribution: Occurring west of the Cascades crest and east in the Columbia River Gorge in Washington; Lewis and Thurston counties, south to Marion County, Oregon
Habitat: Moist woods and streambanks at low elevations
Origin: Native
Flowers: June - July
Growth Duration: Perennial
Ficaria vernalesser celandine
Distribution: Occurring west of the Cascades crest in Washington; British Columbia to Oregon, also in eastern North America.
Habitat: Disturbed areas generally at low elevations, often where seasonally moist in the spring.
Origin: Introduced from Europe
Flowers: April-May
Growth Duration: Perennial
Halerpestes cymbalariaalkali buttercup, seaside buttercup
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Great Plains, Great Lakes, and northeastern North America.
Habitat: Ditches, marshes and muddy meadowlands, often where saline or alkaline.
Origin: Native
Flowers: May-August
Growth Duration: Perennial
Helleborus foetidusstinking hellebore
Distribution: Currently only known from lowland western Washington.
Habitat: Disturbed sites near urban or suburban areas, where escaped from cultivation.
Origin: Introduced
Flowers: February-April
Growth Duration: Perennial
Myosurus ×alopecuroideshybrid mouse-tail
Distribution: Occurring east of the Cascades crest in Washington; eastern Washington to California, east to Elmore County, Idaho.
Habitat: Verrnal pools and alkali flats in sagebrush desert.
Origin: Native
Flowers: March-May
Growth Duration: Annual
Myosurus apetalusbristly mouse-tail, sedge mouse-tail
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to Wyoming.
Habitat: Moist areas and vernal streambeds, mostly low elevation grasslands and sagebrush, occasionally to subalpine.
Origin: Native
Flowers: March-June
Growth Duration: Annual
var. borealis – sedge mouse-tail
Myosurus minimustiny mouse-tail
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to south-central Canada and across the central U.S. to the southeastern states.
Habitat: Wet places, especially vernal pools.
Origin: Native
Flowers: April-June
Growth Duration: Annual
Myosurus sessilisshor-tstemmed mouse-tail, vernal pool mouse-tail
Distribution: Occurring east of the Cascades crest in Washington, where known from Klickitat County in Washington; South-central Washington to north-central Oregon, also in central California.
Habitat: Vernal pools.
Origin: Native
Flowers: April-June
Growth Duration: Annual
Nigella damascenadevil-in-the-bush, love-in-a-mist
Distribution: Known sparingly in Washington from lowland areas west of Cascades crest; southwestern British Columbia to California, east across northern U.S. to eastern North America.
Habitat: Yard waste dump sites, disturbed open ground, and other sites were plants escape from cultivation.
Origin: Introduced from Eurasia
Flowers: May-September
Growth Duration: Annual
Ranunculus abortivuskidney-leaf buttercup
Distribution: Occurring in the northeastern region of Washington; Yukon Territory to the southern Rocky Mountains and Gulf Coast, east to the Atlantic coast.
Habitat: Montane forest understory and meadows.
Origin: Native
Flowers: July
Growth Duration: Biennial, Perennial
Ranunculus acrismeadow buttercup
Distribution: Occurring chiefly west of the Cascades crest in Washington; Alaska to California, east across the northern part of the U.S. and Canada to eastern North America.
Habitat: Moist to well-drained soil at low to middle elevations.
Origin: Introduced from Europe
Flowers: May-August
Growth Duration: Perennial
Ranunculus alismifoliusplantain-leaved buttercup
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains.
Habitat: Swales, streambanks and moist meadows, low to high elevations in the mountains.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
var. alismellus – dwarf plantain-leaved buttercup
var. alismifolius – plantain-leaved buttercup
var. hartwegii – Hartweg's buttercup
Ranunculus aquatiliswhite western buttercup, water crowfoot, white water crowfoot
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across North America to the Atlantic Coast.
Habitat: In sluggish streams, ponds, lakes, and mudflats at low to moderate elevations.
Origin: Native
Flowers: May-August
Growth Duration: Perennial
var. aquatilis – white water buttercup
var. diffusus – water buttercup
Ranunculus arvensisfield buttercup, hungerweed
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to Idaho and Utah; also in areas of central and eastern U.S.
Habitat: Dry woodlands and waste ground.
Origin: Introduced from Europe
Flowers: May-June
Growth Duration: Annual
Ranunculus bulbosusSt. Anthony's-turnip, bulbous buttercup
Distribution: Occurring west of the Cascades crest in Washington; British Columbia to California, also widespread in eastern North America.
Habitat: Disturbed open areas at low elevation.
Origin: Introduced from Europe
Flowers: May-June
Growth Duration: Perennial
Ranunculus californicusCalifornia buttercup
Distribution: Occurring west of the Cascades crest along the northwestern coast in Washington; British Columbia to California.
Habitat: Grassy bluffs along the coast.
Origin: Native
Flowers: April-June
Growth Duration: Perennial
var. californicus – California buttercup
Ranunculus cardiophyllusheart-leaf buttercup
Distribution: Reported from northeastern Washington, but no specimens have been seen; eastern British Columbia, south in the Rocky Mountains to Arizona and New Mexico, east to Alberta and the northern Great Plains.
Habitat: Wet to dry montane to subalpine meadows.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Ranunculus eschscholtziisubalpine buttercup
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains.
Habitat: Meadow and talus slopes at mid- to high elevations in the mountains.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
var. eschscholtzii – Eschscholtz buttercup
var. suksdorfii – Suksdorf's buttercup
Ranunculus flabellarisyellow water buttercup
Distribution: Occurring east of the Cascades crest in Washington; British Columbia to northern California, east to the Rocky Mountain states and in central and eastern North America.
Habitat: Shallow ponds, mud flats and marshes at low elevations.
Origin: Native
Flowers: May-August
Growth Duration: Perennial
Ranunculus flammulacreeping buttercup, lesser spearwort
Distribution: Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east across most of North America to the Atlantic Coast.
Habitat: Mostly in mud, often where brackish, from sea level to mid-elevations in the mountains.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
var. flammula – creeping spearwort
var. ovalis – creeping spearwort
var. reptans – creeping spearwort
Ranunculus glaberrimussagebrush buttercup
Distribution: Occurring chiefly east of the Cascades in Washington, with disjunct populations in the northeast Olympic Mountains and Ross Lake area of Whatcom County; British Columbia to northern California, east to the Great Plains.
Habitat: Sagebrush desert, shrub-steppe and ponderosa pine woodlands.
Origin: Native
Flowers: March-June
Growth Duration: Perennial
var. ellipticus – sagebrush buttercup
var. glaberrimus – sagebrush buttercup
Ranunculus gmeliniiGmelin's buttercup, small yellow water buttercup
Distribution: Occurring chiefly east of the Cascades crest in Washington; Alaska south to Nevada, east to the Rocky Mountains, and across Canada to the Atlantic Coast.
Habitat: Standing water up to 2 meters deep.
Origin: Native
Flowers: May-September
Growth Duration: Perennial
Ranunculus grayiarctic buttercup
Distribution: Occurring in the Olympics and Cascades mountains in Washington; Alaska to Oregon, east to Alberta, Montana, Wyoming and Colorado.
Habitat: Alpine.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Ranunculus hebecarpusdowny buttercup
Distribution: Occurring east of the Cascades crest in Washington; Washington to Baja California, east to Idaho and Arizona.
Habitat: Moist to rather dry hillsides and woodlands.
Origin: Native
Flowers: March-May
Growth Duration: Annual
Ranunculus inamoenusgraceful buttercup
Distribution: Occurring east of the Cascades crest in northeastern Washington; British Columbia to Nevada and Arizona, east to Montana, Wyoming, Colorado and New Mexico, also in scattered areas of the northern Great Plains.
Habitat: Mountain meadows and moist slopes.
Origin: Native
Flowers: June-July
Growth Duration: Perennial
var. inamoenus – unlovely buttercup
Ranunculus macouniiMacoun's buttercup
Distribution: Occurring chiefly east of the Cascades crest in Washington; Alaska south to California, east to the Rocky Mountains and northern Great Plains and central Canada; also in Canadian Maritimes.
Habitat: Riparian areas and wet meadows from lowlands to montane.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
Ranunculus muricatusspiny-fruit buttercup
Distribution: Occurring chiefly west of the Cascades crest and in the Columbia River Gorge in Washington; Washington to California, east across North America in scattered locations.
Habitat: Ditches and other moist places, often on cultivated land.
Origin: Introduced from Europe
Flowers: April-June
Growth Duration: Annual, Biennial, Perennial
Ranunculus occidentaliswestern buttercup
Distribution: Occurring chiefly west of the Cascades crest and east in the Columbia River Gorge in Washington; Alaska to California, east to Alberta and Nevada.
Habitat: Moist to well-drained soil, low to mid-elevations in the mountains.
Origin: Native
Flowers: April-June
Growth Duration: Perennial
var. occidentalis – western buttercup
Ranunculus orthorhynchusstraight-beak buttercup
Distribution: Occurring on both sides of the Cascades crest in Washington; southeastern Alaska to California, east to Idaho, western Montana, western Wyoming, Utah, and Nevada.
Habitat: Streambanks and moist fields to mountain meadows and slopes.
Origin: Native
Flowers: April-August
Growth Duration: Perennial
var. orthorhynchus – straight-beak buttercup
var. platyphyllus – straight-beak buttercup
Ranunculus parviflorussmall-flower buttercup
Distribution: Sparingly introduced to lowlands of west of the Cascades crest in Washington; Washington to California; also in the southeastern U.S.
Habitat: Roadsides, fields, urbanized settings, and other disturbed areas.
Origin: Introduced from Europe
Flowers: April-June
Growth Duration: Annual
Ranunculus pensylvanicusPennsylvania buttercup
Distribution: Occurring on both sides of the Cascade crest in Washington; Alaska to Washington, Idaho and Montana; also in eastern North America and scattered areas in the Southwest.
Habitat: Wet ground, especially along streams.
Origin: Native
Flowers: June-July
Growth Duration: Annual, Perennial
Ranunculus populagomountain buttercup
Distribution: Occurring chiefly east of the Cascades crest in southeastern Washington; Washington to California, east to Idaho and western Montana.
Habitat: Wet areas at mid- to high elevations in the mountains.
Origin: Native
Flowers: April-August
Growth Duration: Perennial
Ranunculus pygmaeusdwarf buttercup
Distribution: Occurring east of the Cascades crest in north-central Washington; Alaska to Washington, Idaho and the Rocky Mountains, east across northern Canada to Greenland, and Europe.
Habitat: Alpine meadows and rock crevices, generally near snowbanks.
Origin: Native
Flowers: June-August
Growth Duration: Perennial
Ranunculus repenscreeping buttercup
Distribution: Occurring throughout Washington, but more common west of the Cascades crest; Alaska to California and Utah, and from central plains of U.S. to Labrador.
Habitat: Wet meadows and fields, riparian corridors disturbed forest understory, lawns, and other disturbed areas where often moist.
Origin: Introduced from Europe
Flowers: April-August
Growth Duration: Perennial
Ranunculus sardoushairy buttercup
Distribution: Occurring west of the Cascade in Washington; British Columbia to northern California; also in the eastern United States, Europe, Australia and Pacific Islands.
Habitat: Disturbed areas, fields and open woods.
Origin: Introduced from Europe
Flowers: May-July
Growth Duration: Annual, Biennial, Perennial
Ranunculus sceleratusblister buttercup, celery-leaved buttercup, celery-leaved crowfoot
Distribution: Widely distributed throughout much of Washington; widely distributed throughout much of North America.
Habitat: Moist meadows and boggy shoreland to semi-aquatic and often brackish areas.
Origin: Native
Flowers: May-September
Growth Duration: Perennial
var. multifidus – celery-leaved buttercup
var. sceleratus – celery-leaved buttercup
Ranunculus triternatusDalles Mountain buttercup, obscure buttercup
Distribution: Occurring east of the Cascades crest in Washington, where known from Klickitat County; south-central Washington to Wasco County, Oregon.
Habitat: Sagebrush slopes.
Origin: Native
Flowers: (December) January-April
Growth Duration: Perennial
Ranunculus uncinatuslittle buttercup
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains.
Habitat: Moist, usually shady areas, sea level to mid-elevations in the mountains.
Origin: Native
Flowers: April-July
Growth Duration: Annual, Perennial
Thalictrum dasycarpumpurple meadow-rue
Distribution: Occurring in the northeastern corner of Washington; Alberta to Arizona, east to central North America.
Habitat: Meadowlands and moist woods.
Origin: Native
Flowers: May-July
Growth Duration: Perennial
Thalictrum occidentalewestern meadow-rue
Distribution: Occurring on both sides of the Cascades crest in Washington; Yukon Territory to northern California, east to Montana and Colorado.
Habitat: Shady woodlands and forests, from low elevations to mid-elevations in the mountains.
Origin: Native
Flowers: May-August
Growth Duration: Perennial
Thalictrum venulosumveiny-leaf meadow-rue
Distribution: Occurring chiefly east of the Cascades crest in Washington; Yukon Territory to Nevada, Utah, and New Mexico, east to eastern North America.
Habitat: Riparian areas, coniferous forest understory.
Origin: Native
Flowers: June-July
Growth Duration: Perennial
Trautvetteria caroliniensisfalse bugbane, wild bugbane
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains, also in central and southeastern U.S.
Habitat: Moist, open woods and stream banks, low to mid-elevations in the mountains.
Origin: Native
Flowers: May-August
Growth Duration: Perennial
Trollius albifloruswestern globeflower
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to Washington, east to the Rocky Mountains.
Habitat: Subalpine and alpine wet meadows and slopes, blooming as the snow recedes.
Origin: Native
Flowers: May-August
Growth Duration: Perennial