Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across most of North America to the Atlantic Coast.
Habitat: Roadsides, meadows, grasslands, prairies, and other disturbed open areas.
Origin: Introduced from Eurasia and North Africa
Growth Duration: Annual
Conservation Status: Not of concern
Copiously villous annual, the stem 0.5-2 m. tall, clambering.
Leaves pinnate; leaflets 10-20, linear-lanceolate to narrowly oblong, 1.5-2 cm. long; stipules entire to toothed, 5-12 mm. long; tendrils well developed.
Inflorescence of 20- to 60-flowered, dense, one-sided racemes, on long, axillary peduncles; flowers 15-18 mm. long, reddish-purple to violet; calyx less than half the length of the corolla, the tube 2.5-4 mm. long, very strongly gibbous at the base, the pedicel attached just under the bulge; upper 2 calyx teeth triangular-based but prolonged to a slender tip; lower 3 linear and about equal to the tube; style densely bearded at the tip.
Pod 2-3 cm. long and 6-10 mm. broad, several seeded.