Japan Flora: Slightly smaller and with more slender stems; stipules small, bifid; leaflets 10-14, elliptic to oblong, 10-20 mm. long, 6-10 mm. wide, rounded to retuse; racemes 2-3 cm. long, rather manyflowered; flowers pale bluish purple; calyx-teeth short; legumes 2-2.5 cm. long, about 6 mm. wide, several-seeded. Apr.-Aug. Thickets and grassy places, seashores to the mountains.
Hokkaido, Honshu; rather common. Korea, Sakhalin, and s. Kuriles.