Japan Flora: Nearly glabrous perennial herb; stems 80-120 cm. long, striate or obtusely angled in the upper part; leaves short-petioled, the stipules semisagittate, sometimes dentate, 15-30 mm. long, the leaflets 4-8, membranous, ovate or elliptic, obtuse, 3-8 cm. long, 2-4 cm. wide, nearly penninerved, glaucous beneath, the tendrils 2- or 3-branched; racemes many-flowered, 5-15 cm. long, on peduncles 5-10 cm. long; flowers yellow, changing to brown, 15-18 mm. long, suddenly curved upward near the middle; calyx-teeth depressed-triangular; legumes linear, flat, 8-10 cm. long, 5-6 mm. wide, glabrous, many-seeded. July-Aug. Woods and thickets in mountains.

Hokkaido, Honshu (centr. distr. and northw.), Kyushu. n. China, Manchuria, Ussuri, and Korea.