Japan Flora: Much-branched, erect annual with slender branches; stipules narrowly ovate, few-nerved, 5-8 mm. long, erect, persistent, pale brown; leaves with very short petioles, the leaflets thin, 10-15 mm. long, 5-8 mm. wide; chasmogamic flowers about 5 mm. long, reddish purple, the bracteoles as long as the calyx-tube, ovate, subobtuse; calyx 3-3.5 mm. long, 5-lobed, the lobes ovate, subacute; calyx of deistogamic flowers similar to those of the chasmogamic; legumes flat, nearly orbicular, about 3.5 mm. long, with short appressed scattered hairs.  Waste ground and roadsides.

Hokkaido, Honshu, Shikoku, Kyushu; common. Man­churia, China, Korea, Ryukyus, and Formosa; naturalized in N. America.