Distribution: Occurring chiefly west of the Cascades crest in Washington; southwestern British Columbia to California, scattered eastward across much of North America.

Habitat: Waste ground and disturbed areas, mostly at low elevations.

Flowers: March-June

Origin: Introduced

Growth Duration: Annual, Perennial

Conservation Status: Not of concern

Pollination: Bees, butterflies

Usually glabrous annual, the stems 1-4 dm. long, prostrate to nearly erect.

Leaves trifoliate, the leaflets obovate or obcordate with a wedge-shaped base, 1-1.5 cm, long, not spotted, denticulate at the apex; stipules lacerated for over half their width.

Flowers 2-5 on fairly short peduncles arising from the leaf axils; calyx 3 mm. long, the 5 teeth slightly longer than the tube; corolla pea-like, yellow, 4-5 mm. long, the banner erect, much longer than the wings and keel.

Pod spirally coiled, the margins narrowly keeled, spineless, or with two rows of divergent prickles up to 3 mm. long.