Herb with short stock, somewhat flaccid, up to 10-(15) cm high at flowering; runners greenish, slender, pilose, up to c. 50 cm long and rooting at nodes and tips to form new rosettes. Basal lvs several in rosette; petiole 30-80-(160) mm long, densely pilose; leaflets obovate to narrowly ovate, subacute, obtuse to cuneate at base, bright green above, paler below, usually sparsely to moderately pilose on both surfaces especially along veins, sometimes with only scattered hairs on upper, with margins crenate to obscurely lobed; terminal leaflet 15-55 × 12-30 mm; lateral leaflets = terminal or slightly smaller; petiolules 1-5 mm long, pilose. Scape often only slightly exceeding lvs, pilose. Epicalyx segments broadly obovate, pilose, deflexed at fruiting, with 3-5 purple-tipped teeth. Sepals ovate-triangular, c. 6-10 mm long, acuminate, purple-tipped, pilose. Petals narrowly obovate, 4-8 mm long, ± = epicalyx segments and sepals, shallowly emarginate to rounded, spreading, bright yellow. Achenes uniformly scattered over and projecting from receptacle; receptacle red, swollen, up to 12 mm long, often slightly constricted near base.
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A herb. It keeps growing from year to year. It grows 10 cm high and spreads 1.8 m wide. It is silky and has soft hairs. It has a rootstock that lasts from year to year and puts up slender runners. It has runners which root at the nodes and the tips forming new rings of leaves. The leaves are dark green and have 3 leaflets. The leaves have leaflets which are oval and wedge shaped at the base. They have coarse teeth. They are rounded at the tip. The end leaflet is 1-3 cm long and 0.7-2.5 cm wide. The side leaflets are slightly smaller. The flowers occur singly. The sepals are triangle shaped and 5-10 mm long. The petals are narrowly oval and 5 mm long. The flowers are yellow. The fruit are dry. They spread over a red, swollen, pulpy receptacle. The fruit are 2 cm long.
It suits warm temperate places. It grows in moist shaded places. It grows in wetlands. It is often near river banks and grows in Assam up to 2,000 m above sea level. In Argentina it grows from sea level to 1,800 m above sea level. It suits hardiness zones 6-11. Mt Cootha Botanical Gardens. In Sichuan.
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Shady places in woods, grassy slopes, ravines in low mountains, all over Japan.
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