Japan Flora: Loosely pubescent, scandent annual or biennial; stems 30-60 cm. long; leaves nearly sessile, the stipules bifid or dentate, the leaflets 12-14, thin, lanceolate, rounded to truncate at apex, 10-17 mm. long, 2-3 mm. wide; peduncles slender, 2-3 cm. long, loosely flowered; flowers pale bluish purple, 3-4 mm. long; legumes oblong, pubescent, about 8 mm. long, 3 mm. wide, 2-seeded. Apr.-May. Waste grounds.
Honshu, Shikoku, Kyushu; common. Eurasia and N. Africa.