Ranunculaceae
Buttercup Family
21 genera
94 species
34 subspecies and varieties
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Aconitum columbianumColumbian monkshood
Distribution: Alaska to California, east to Montana and New Mexico.
Habitat: Moist woods and meadows, moderate to subalpine elevations.
Origin: Native
Flowers: June-August
ssp. columbianum – monkshood
Actaea elatatall bugbane
Distribution: Occurring west of the Cascades crest and in the Columbia River Gorge in Washington; British Columbia south to Oregon.
Habitat: Moist, shady woods at low elevations.
Origin: Native
Flowers: June-August
var. elata – tall bugbane
Actaea laciniatacut-leaved bugbane, Mt. Hood bugbane
Distribution: Silver Star Mountain, Skamania County, Washington and the base of Mt. Hood, Oregon.
Habitat: Moist woods at moderate elevations.
Origin: Native
Flowers: Late June - August
Actaea rubrabaneberry
Distribution: Widely distributed throughout Washington; Alaska south to California, east to the Atlantic Coast.
Habitat: Moist woods and streambanks from low elevations to moderate elevations in the mountains.
Origin: Native
Flowers: April-July
Adonis aestivalissummer pheasant's-eye
Distribution: Introduced and occasionallhy escaping, but marginally persistant; uncommon in the Pacific Northwest.
Habitat: Disturbed areas.
Origin: Introduced from Europe
Flowers: June
Anemone deltoideathreeleaf anemone, Columbian windflower
Distribution: On both sides of the Cascades in the southern half of Washington; Washington south to California.
Habitat: Moist to drier areas in open to deep woods at low to moderate elevations.
Origin: Native
Flowers: April-May
Anemone drummondiiDrummond's anemone
Distribution: Occurring in the Olympic and Cascade Mountains in Washington; Alaska south to California, east to Montana.
Habitat: Alpine and subalpine regions.
Origin: Native
Flowers: June-August
var. drummondii – Drummond's anemone
var. lithophila – Drummond's anemone, Little Belt Mountain anemone
Anemone lyalliilittle mountain anemone, Lyall's anemone
Distribution: Chiefly west of the Cascades but occasionally on the east slope in Washington; British Columbia to California.
Habitat: Open prairies at low elevations to subalpine ridges.
Origin: Native
Flowers: March-July
Anemone multifidacliff anemone, Pacific anemone
Distribution: Alaska to California, east to Nebraska and New Mexico in the west, and across the northern tier of states to Maine
Habitat: From the foothills to high elevations in the mountains
Origin: Native
Flowers: May - August
var. multifida – cliff anemone, Pacific anemone
var. saxicola – hirsute anemone
Anemone occidentaliswestern pasqueflower
Distribution: In the Olympic and the Cascade mountains in Washington; British Columbia south to California, east to Montana and the Wallowa Mountains of Oregon.
Habitat: Mountain slopes and meadows at mid- to high elevations.
Origin: Native
Flowers: May-August
Anemone oreganaOregon anemone
Distribution: In Washington occurring on the Olympic Peninsula and chiefly east of the Cascades crest; Chelan County, Washington south to northern California.
Habitat: Moist, open woods, moderate to mid-elevations in the mountains.
Origin: Native
Flowers: March-June
var. felix – Oregon anemone, western wood anemone
var. oregana – Oregon anemone, western wood anemone
Anemone parvifloranorthern anemone, small-flowered anemone
Distribution: Occurring in scattered locaions in Washington; Alaska south to the Cascades of northern Washington, east to the Atlantic Coast, south in the Rocky Mountains to Colorado.
Habitat: Mountain meadows and subalpine stream banks.
Origin: Native
Flowers: May-August
Anemone patenspasqueflower, prairie-crocus
Distribution: East of the Cascades crest in Washington; Alaska south to the Wenatchee Mountains of Washington, east to the Rocky Mountains and northern Great Plains.
Habitat: Prairies to mountain slopes, mostly on well-drained soil.
Origin: Native
Flowers: May-August
var. multifida – cliff anemone
Anemone piperiPiper's anemone, Piper's windflower
Distribution: East of the Cascades in Washington;Washington to northeast Oregon east to Idaho and western Montana.
Habitat: Shady woods at moderate to mid-elevations in the mountains.
Origin: Native
Flowers: April-August
Aquilegia flavescensyellow Columbine
Distribution: East of the Cascades, British Columbia to Kittitas County, Washington, east to Alberta, then south to Colorado; also, the Wallowa Mountains of Oregon
Habitat: Moist mountain meadows and talus to alpine slopes
Origin: Native
Flowers: June - early August
Aquilegia formosared Columbine, Sitka Columbine
Distribution: Widely distributed throughout Washington; Alaska south to California, coastal and inland to Alberta and Wyoming.
Habitat: Open woods, lowlands to mid-elevations in the mountains.
Origin: Native
Flowers: May-August
var. formosa – red Columbine, Sitka Columbine, western Columbine
Aquilegia vulgarisEuropean Columbine
Distribution: Introduced as a garden flower, occasionally escaping.
Habitat: Disturbed soil near gardens.
Origin: Introduced
Flowers: May - July
Arcteranthis cooleyaeCooley's buttercup
Distribution: Alaska and the Cascades of British Columbia, known in Washington from Mt. Colonel Bob in the Olympics and Del Campo Peak Snohomish county.
Habitat: Damp slopes and rocky crevices at high elevations, blossoming as snow recedes.
Origin: Native
Flowers: June - August
Caltha biflorabroadleaved marsh-marigold, twinflowered marsh-marigold
Origin: Native
Caltha leptosepalaelkslip
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska south to California, east to the Rocky Mountains.
Habitat: Wet places in subalpine and alpine regions.
Origin: Native
Flowers: May-August
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
Ceratocephala testiculatahornseed buttercup
Distribution: Introduced in all of western United States, and east in the northern half of the United States to Ohio; chiefly east of the Cascades in Washington and Oregon
Habitat: Disturbed soil in sagebrush deserts and plains
Origin: Introduced from Europe
Flowers: March - May
Clematis hirsutissimaDouglas's clematis, leatherflower, sugarbowls, vaseflower
Distribution: Occurring in only a few counties in central and eastern Washington; Washington south to Oregon, east to Montana, south to Arizona and New Mexico.
Habitat: Meadows, grasslands, and forest openings.
Origin: Native
Flowers: May-June
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
Clematis occidentalisColumbia clematis, rock clematis, Columbia virgins-bower
Distribution: East of the Cascades in Washington; British Columbia south 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
var. dissecta – Columbia clematis
var. grosseserrata – Columbia clematis
Clematis orientalis
Origin: Introduced
Clematis vitalbatraveler's-joy
Distribution: Established chiefly west of the Cascades in Washington; British Columbia south to California, scattered locations in eastern North America.
Habitat: Waste land.
Origin: Introduced; native to Europe and Africa
Flowers: June-September
Coptis aspleniifoliafern-leaf goldthread
Distribution: Alaska to Vancouver Island, British Columbia, and in Whatcom, Jefferson and Snohomish Counties, Washington
Habitat: Moist woods and bogs
Origin: Native
Flowers: Late April - May
Coptis laciniataOregon goldthread
Distribution: Occurring in the southwestern region of Washington; Washington south to California.
Habitat: Moist woods at low elevations.
Origin: Native
Flowers: April-August
Coptis occidentalisIdaho goldthread
Distribution: Northeast Washington and adjacent British Columbia, east to Idaho and Montana
Habitat: Moist woods
Origin: Native
Flowers: April - May
Coptis trifoliathreelflet goldthread
Origin: Native
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
Delphinium basalticumbasaltic larkspur
Origin: Native
Delphinium ×burkei
Origin: Native
Delphinium depauperatumslim larkspur
Distribution: Occurring east of the Cascades crest in Washington; Washington south to California, east to Montana, Idaho, and Nevada.
Habitat: Moist meadows and forest openings.
Origin: Native
Flowers: May-July
Delphinium distichumtwo-spike larkspur
Distribution: Occurring east of the Cascades crest in Washington; British Columbia south to Oregon, east to Montana and Wyoming.
Habitat: Vernally wet swales and meadows, in sagebrush or ponderosa pine forest.
Origin: Native
Flowers: May-July
Delphinium glareosumOlympic larkspur
Distribution: In the Olympic and Cascades mountains of Washington; British Columbia south to Oregon.
Habitat: Alpine and subalpine ridges and talus slopes, sometimes found at lower elevations.
Origin: Native
Flowers: May-August
Delphinium glaucumpale larkspur
Distribution: Widely distributed in mountainous areas throughout Washington; Alaska south to California, east to the Rocky Mountains of Canada and U.S.
Habitat: Wet places at moderate to mid-elevations in the mountains.
Origin: Native
Flowers: July-September
Delphinium leucophaeumpale larkspur
Distribution: Known only from Lewis County in Washington; Lewis County, Washington south to Willamette Valley, Oregon.
Habitat: Bluffs, open ground, and moist lowland meadows where undisturbed.
Origin: Native
Flowers: May-June
Delphinium lineapetalumthin-petal larkspur
Distribution: Endemic to Washington, primarily found in the Wenatchee Mountains of Chelan and Kittitas Counties in Washington.
Habitat: Meadows and forest openings in foothills and valleys.
Origin: Native
Flowers: April-June
Delphinium menziesiiMenzies larkspur
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia south to Oregon.
Habitat: Coastal bluffs and prairies to moist meadows and forest openings at moderate elevations in the mountains.
Origin: Native
Flowers: April-July
Delphinium multiplexKittitas larkspur
Distribution: Wenatchee Mountains of Kittitas and Chelan Counties, Washington, south to northern Yakima County.
Habitat: Along rocky, usually intermitant streams or springs in sagebrush hills to moderate elevations in the mountains.
Origin: Native
Flowers: Late May - Early August
Delphinium nuttallianumtwo-lobe larkspur, upland larkspur
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia south 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-July
Delphinium nuttalliiNuttall's larkspur
Distribution: Pierce and eastern Grays Harbor Counties, Washington, south to the Columbia River Gorge and Clackamus County, Oregon.
Habitat: Gravelly outwash prairies and basaltic cliffs.
Origin: Native
Flowers: May - June
Delphinium occidentalewestern larkspur
Origin: Native
Delphinium stachydeumhedgenettle larkspur, spiked larkspur
Origin: Native
Flowers: Late June - Early August
Delphinium sutherlandiisutherland's larkspur
Origin: Native
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 moderate elevations.
Origin: Native
Flowers: April-May
Delphinium viridescensWenatchee larkspur
Distribution: Local in the Wenatchee Mountains, Chelan and Kittitas Counties, Washington.
Habitat: Boggy meadowlands.
Origin: Native
Flowers: June - July
Delphinium xantholeucumyellow-white larkspur
Distribution: Southern Okanogan County to southern Chelan County, east into Douglas County, Washington
Habitat: Dry, grassy hillsides and ponderosa pine forests
Origin: Native
Flowers: April - June
Enemion halliiWillamette false rue-anemone
Distribution: Lewis and Thurston Counties, Washington, south in the Columbia River Gorge and Willamette Valley to Marion County, Oregon
Habitat: Moist woods and streambanks at low elevations
Origin: Native
Flowers: June - July
Ficaria vernalesser celandine
Distribution: In scattered locations in western Washington but likely more widespread; British Columbia south to Oregon; eastern North America.
Habitat: Disturbed areas often where shaded and moist.
Origin: Introduced from Europe
Flowers: April-May
Halerpestes cymbalariaalkali buttercup, seaside buttercup
Distribution: Occurring on both sides of the Cascades crest in Washington; widely distributed throughout much of North America except southern and southeastern regions of U.S.
Habitat: Ditches, marshes and muddy meadowlands.
Origin: Native
Flowers: May-August
Helleborus foetidus
Origin: Introduced
Myosurus ×alopecuroides
Distribution: Occurring east of the Cascades crest in Washington; Washington south, east of the Cascades, to Oregon, east to Idaho.
Habitat: Sagebrush-steppe.
Origin: Native
Flowers: March-May
Myosurus apetalusbristly mouse-tail, sedge mouse-tail
Distribution: East side of the Cascades, 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: Late March - early June
var. borealis – sedge mouse-tail
Myosurus minimustiny mousetail
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia south 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
Myosurus sessilisshortstemmed mouse-tail, vernal pool mouse-tail
Distribution: Known from Klickitat County in Washington; South-central Washington south to north-central Oregon, also in central California.
Habitat: Vernal pools.
Origin: Native
Flowers: April-June
Nigella damascenadevil-in-the-bush
Distribution: Introduced across the northern states in the United States, and parts of southern Canada.
Habitat: Dump sites and waste ground.
Origin: Introduced from Eurasia
Flowers: May - September
Ranunculus abortivuskidney-leaf buttercup
Origin: Native
Flowers: July
Ranunculus acrismeadow buttercup
Distribution: Occurring chiefly west of the Cascades crest in Washington; widely distributed in the northern half of North America.
Habitat: Moist to well-drained soil at low to moderate elevations.
Origin: Introduced from Europe
Flowers: May-August
Ranunculus alismifoliusplantainleaved buttercup
Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia south to California, east to the Rocky Mountains.
Habitat: Swales, streambanks and moist meadows, moderate to high elevations in the mountains.
Origin: Native
Flowers: May-July
var. alismellus – dwarf plantain-leaved buttercup
var. alismifolius – plantain-leaved buttercup
var. hartwegii – hartweg's buttercup
Ranunculus aquatiliswhite western-buttercup, water crowfoot
Distribution: Alaska to California, east to Montana and Wyoming
Habitat: In sluggish streams and ponds, low to moderate elevations
Origin: Native
Flowers: May - August
var. aquatilis – white water buttercup
var. diffusus – water buttercup
Ranunculus arvensisfield buttercup, hungerweed
Distribution: Known only from along eastern border in Washington; Washington south 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
Ranunculus bulbosusSt. Anthony's-turnip, bulbous buttercup
Origin: Introduced from Europe
Flowers: May - June
Ranunculus californicusCalifornia buttercup
Distribution: Occurring along the northern coastal areas of Washington; British Columbia south to California.
Habitat: Grassy bluffs along the coast.
Origin: Native
Flowers: May-June
var. californicus – California buttercup
Ranunculus cardiophyllusheart-leaf buttercup
Origin: Native
Flowers: June - August
Ranunculus eschscholtziisubalpine buttercup
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to Montana, Colorado and New Mexico.
Habitat: Meadow and talus slopes at mid- to high elevations in the mountains.
Origin: Native
Flowers: June-August
var. eschscholtzii – Eschscholtz buttercup
var. suksdorfii – Suksdorf buttercup, Suksdorf's buttercup
Ranunculus flabellarisyellow water buttercup
Distribution: East side of the Cascades, British Columbia to northern California, east in Canada to Quebec.
Habitat: Shallow ponds, mud flats and marshes at low elevations.
Origin: Native
Flowers: May-August
Ranunculus flammulacreeping buttercup, lesser spearwort
Distribution: Widely distributed throughout much of Washington; widely distributed throughout much of North America except in southern part of U.S.
Habitat: Mostly in mud, often where brackish, from sea level to mid-elevations in the mountains.
Origin: Native
Flowers: May-July
var. flammula – creeping spearwort
var. ovalis – creeping spearwort
var. reptans – creeping spearwort
Ranunculus glaberrimussagebrush buttercup
Distribution: East side of the Cascades, British Columbia to northern California, east to the Dakotas
Habitat: Sagebrush desert, shrub-steppe and ponderosa pine woodlands
Origin: Native
Flowers: March - Early June
var. ellipticus – sagebrush buttercup
var. glaberrimus – sagebrush buttercup
Ranunculus gmeliniismall 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
Ranunculus grayiarctic buttercup
Distribution: Olympic and Cascade mountains in Washington; scattered from Alaska south to Colorado in the Rocky Mountains.
Habitat: Alpine.
Origin: Native
Flowers: June-August
Ranunculus hebecarpusdowny buttercup
Distribution: Eastern Washington and adjacent Idaho, south to Arizona and Baja California.
Habitat: Moist to rather dry hillsides and woodlands.
Origin: Native
Flowers: March - May
Ranunculus inamoenusgraceful buttercup, unlovely buttercup
Origin: Native
Flowers: June - July
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
Ranunculus muricatusspiny-fruit buttercup
Distribution: Introduced in scattered locations in the United States; mostly west of the Cascades in Washington, Oregon and California.
Habitat: Ditches and other moist places, often on cultivated land.
Origin: Introduced from Europe
Flowers: April - June
Ranunculus occidentaliswestern buttercup
Distribution: Occurring chiefly west of the Cascades crest in Washington; Alaska south 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
var. occidentalis – western buttercup
Ranunculus orthorhynchusstraightbeak buttercup
Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska south to California, east to Montana and Utah.
Habitat: Streambanks and moist fields to mountain meadows and slopes.
Origin: Native
Flowers: April-August
var. orthorhynchus – straight-beak buttercup
var. platyphyllus – straight-beak buttercup
Ranunculus parviflorussmall-flower buttercup
Distribution: Sparingly introduced to lowlands of western Washington; Washington south to California; southeastern U.S.
Habitat: Roadsides, fields, urbanized settings, and other disturbed areas.
Origin: Introduced from Europe
Flowers: April-June
Ranunculus pensylvanicusPennsylvania buttercup
Origin: Native
Flowers: June - July
Ranunculus populagomountain buttercup
Distribution: In two discrete locations in Washington (Pierce County and Blue Mountains); Washington south to California, east to Idaho and western Montana.
Habitat: Wet areas at mid- to high elevations in the mountains.
Origin: Native
Flowers: April-August
Ranunculus pygmaeusdwarf buttercup
Origin: Native
Flowers: June - August
Ranunculus repenscreeping buttercup
Distribution: Occurring throughout Washington, but most common west of the Cascades; Alaska south to California and Utah, and from central plains of U.S. to Labrador.
Habitat: Moist areas, lawns and gardens, disturbed forest understory.
Origin: Introduced from Europe
Flowers: May-August
Ranunculus sardoushairy buttercup
Origin: Introduced from Europe
Flowers: May - July
Ranunculus sceleratusblister buttercup, celeryleaved buttercup, celeryleaved 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
var. multifidus – celery-leaved buttercup
var. sceleratus – celery-leaved buttercup
Ranunculus triternatusobscure buttercup
Distribution: Goldendale area, Klickitat County, Washington, south to Wasco County, Oregon.
Habitat: Sagebrush slopes.
Origin: Native
Flowers: March - April
Ranunculus uncinatuslittle buttercup
Distribution: Widely distributed throughout Washington; Alaska to California, east to Montana and New Mexico.
Habitat: Moist, usually shady areas, sea level to mid-elevations in the mountains.
Origin: Native
Flowers: April-July
Thalictrum dasycarpumpurple meadow-rue
Distribution: Occurring in the northeastern corner of Washington; Alberta south to Arizona, east to central North America.
Habitat: Meadowlands and moist woods.
Origin: Native
Flowers: May-July
Thalictrum occidentalewestern meadow rue
Distribution: Occurring on both sides of the Cascades in Washingtton; British Columbia south 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
Thalictrum venulosumveiny-leaf meadow-rue
Distribution: Occurring east of the Cascades crest in Washington; Yukon Territory to Nevada, east to eastern North America, south to New Mexico.
Habitat: Riparian areas, coniferous forest understory.
Origin: Native
Flowers: June-July
Trautvetteria caroliniensisfalse bugbane, wild bugbane
Distribution: Widely distributed throughout Washington; British Columbia south to California, east across Canada and the U.S. to the Atlantic Coast.
Habitat: Moist, open woods and stream banks, low to mid-elevations in the mountains.
Origin: Native
Flowers: May-August
Trollius albifloruswestern globeflower
Distribution: Chiefly in the Olympics and Cascades mountains of Washington; British Columbia south to Washington, east to Montana, south to Colorado and Utah.
Habitat: Subalpine and alpine wet meadows and slopes, blooming as the snow recedes.
Origin: Native
Flowers: May-August