Distribution: Introduced and occasionally established in Washington, Oregon and Idaho; more common in eastern United States.
Habitat: Waste places, disturbed soil.
Flowers: April - July
Conservation Status: Not of concern
Pubescent perennial from rhizomes, the stems 5-30 cm. long, decumbent to creeping and rooting at the nodes.
Leaves trifoliate, leaflets obovate, 1-2.5 cm. long, serrulate, very shallowly notched; stipules 15-20 mm. long, narrow, the free portion acuminate.
Inflorescence of many-flowered, globose heads, 10-20 mm. in diameter, on long, naked peduncles; flowers pea-like, 4-6 mm. long, pink to purplish, subtended by narrow bracts, the basal bracts united to form a small involucre; calyx hairy, 5-toothed, nearly as long as the corolla, the tube gradually inflating greatly and becoming strongly net-veined, causing the head to resemble a mass of veined bladders.