Ranunculus
buttercup, crowfoot, water-buttercup
29 species
19 subspecies and varieties
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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
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
Distribution: Occurring 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
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
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
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
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
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
Distribution: Occurring west of the Cascade Crest; Washington to northern California, eastern United States, Europe, Australia and Pacific Islands.
Habitat: Disturbed areas, fields and open woods.
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