Japan Flora: Perennial short-pilose herb, with short slender stolons; rhizomes short and stout; stems 15-30 cm. long, slender; stipules of radical leaves pale green to brownish; leaflets 3 (rarely also with a pair of small accessory leaflets on the upper part of the petiole), oblong to ovate or obovate, rounded to subacute, toothed, rather thin, green above, often somewhat purplish beneath; flowers rather many, 10-15 mm. across; calyx-segments broadly lanceolate, acute; bracts of caliculus slightly smaller; petals 1.5 times as long as the calyx- segments; receptacle slightly pilose; achcncs about 1 mm. long, pale, rugulose, glabrous; styles rather stout, about 1 mm. long. Apr.-June. Sunny slopes of hills.

Hokkaido, Honshu, Shikoku, Kyushu; common. Korea, Manchuria, and Amur.