Japan Flora: Slightly pubescent to glabrate, prostrate to procumbent peren­nial; stems 80-150 cm. long; leaves very short-petioled, the stipules semi-ovate, dentate or 2-fid, the leaflets 4-10, charta­ceous, often subalternate on axis, ovate, 3-5 cm. long, 15-30 mm. wide, acute to obtuse, yellowish brown when dry, the tendrils sometimes simple; racemes 4-6 cm. long, rarely sparsely branched at base, many-flowered, long-peduncled; flowers bluish purple, 13-15 mm. long; calyx-teeth depressed, deltoid, the lowest ones 05-0.8 mm. long; legumes short- stiped, narrowly oblong, flat, 25-30 mm. long, 6-7 mm. wide, glabrous, several-seeded, the stipe 2-3 mm. long, included within the calyx. Aug.-Oct.

Hokkaido, Honshu, Shikoku, Kyushu. n. China and e. Siberia.