Distribution: Occurring east of the Cascades crest in Washington; British Columbia to California, east to central North America, and further east to the northeastern U.S.
Habitat: Damp soil, especially along rivers and around lakes, ponds, and swamps at low elevations.
Growth Duration: Annual, Biennial
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.