Japan Flora: Thinly pubes­cent perennial herb with acid juice; stems long-creeping from a thickened tap-root; leaves alternate, long-petioled, the leaflets depressed-obcordate, 1-2.5 cm. wide, retuse; stipules minute but distinct; peduncles erect, with linear or lanceolate bracts at apex, (1-)2- to 8-flowered; flowers yellow, about 8 mm. across; capsules cylindric, 1.5-2.5 cm. long, many-seeded; seeds broadly ovate, lenticular, transversely rugulose.  May-Sept. Waste grounds and roadsides in lowlands and hills.

Hokkaido, Honshu, Shikoku, Kyushu; very common; variable. Cosmopolitan in all temperate and warm areas.