Japan Flora: Slender, slightly pubescent biennial; stems 30-60 cm. long; leaves nearly sessile, the stipules semi- sagittate, the leaflets 8-12, thin, linear-oblong, 12-17 mm. long, 2-4 mm. wide; peduncles axillary, 2-3 cm. long, slender, the bracts minute; flowers purple or bluish purple, about 5 mm. long; legumes oblong to elliptic, glabrous, 8-10 mm. long, about 4 mm. wide, 3- to 6-seeded. Apr.-May. Waste grounds and grassy places in lowlands.

Honshu, Shikoku, Kyushu; common.  Ryukyus, Formosa, Korea, China to Europe.