Japan Flora: Perennial herb, short-pubescent while young, the stems rather stiff, angular, ascending, 30-80 cm. long; leaves pctioled, the stipules semi-ovatc, dentate, rather large, the leaflets 4-6, firmly chartaceous, elliptic, 2.5-5 cm. long, 15-30 mm. wide, with prominently raised veinlets beneath, the tendrils simple, short, often reduced to a spinelike point; racemes densely flowered, 1-3 cm. long, often branched at base, on peduncles about 5 cm. long; flowers bluish purple, 10-12 mm. long; calyx-teeth depressed-deltoid; legumes as in the preceding species.  July-Oct.

Hokkaido, Honshu, Shi­koku, Kyushu. Korea and China.