Distribution: British Columbia south, east of the Cascades in Washington, down the Columbia River Gorge and the Willamette Valley to southwest Oregon and coastal California, east to Minnesota and New Mexico.
Habitat: Damp soil, especially along rivers and around lakes, ponds, and swamps.
Flowers: May - September
Conservation Status: Not of concern
Spreading to erect annual or biennial from a strong taproot and simple crown, strongly pubescent; stem freely-branched and floriferous most of the length.
Basal and lower cauline leaves mostly crowded-pinnate with 5 leaflets, the leaflets oblong-oblanceolate, coarsely serrate; upper leaves trifoliate, the leaflets narrower.
Inflorescence leafy-bracteate, many-flowered, diffuse, long-pedunculate; calyx cup-shaped, 5-10 mm. broad at flowering, enlarging in fruit, the 5 lobes ovate-triangular, erect, longer than the tubular portion but shorter than the 5 elliptic-lanceolate bracteoles; petals 5, yellow, broadly oblanceolate, rounded, half as long as the sepals; stamens mostly 10, sometimes 15; pistils numerous; styles apical, thickened at the base.
Achenes yellow, ovoid-reniform, 0.8 mm. long.