Japan Flora: Erect annual, usually branched, long- appressed brown-villous except on upper side of leaves; stems 20-70 cm. long, terete; leaves 1-foliolate, nearly sessile, broadly linear to lanceolate, 4-10 cm. long, 3-10 mm. wide, acute to obtuse, the stipules linear, 3-5 mm. long; flowers blue, in terminal spikes, the bracts linear, 5-8 mm. long; calyx rusty- brown villous, accrescent after anthesis, ovoid, 10-15 mm. long； petals about 10 mm. long, slightly shorter than the calyx, the standard rounded-obovate, clawed, the limb with deeper colored striations on lower half near the middle, the wing horizontal, the keel white with a blue beak, convex on back below the middle, brownish villous on margin, 7-8 mm. long; style straight, with short, appressed hairs on one side; legumes enclosed in the calyx, oblong, 10-12 mm. long, glabrous, dehiscent. July-Sept. Grassy places in lowlands.

Honshu, Shikoku, Kyushu. Korea, Manchuria, China, Ryukyus, Formosa to Malaysia, and India.