Dichocarpum nipponicum var. sarmentosum is a perennial by a mountain river in damp places. Rhizomes are short and enveloped with broad petiole bases; stems measure 5-18cm tall and bear 5- 7 cm long runners after flowers. Radical leaves are 3-11cm long, including the petioles, with broad bases, in a broad-oval shape, comprising three leaflets with fan-shaped terminals with uneven incisions or dentations on the margins. And lateral leaflets cut themselves into 3-5 new ones. On-stem leaves are on the upper half, generally of opposite phyllotaxis, 1.2-4.5cm long, including the petioles, in the shape of a fan-shaped reniform or cut into three lobes anew. Flowers have five sepals with narrow, obovate portions, 7-9mm long, and pale yellow to red-brown at the bases. They also have five petals, 4mm long, linear with circular tips. Bloom time: March-May.