Stolons 15--65 cm, subglabrous. Basal leaves 8--15, glabrous; petiole 2.2--17 cm, vaginate at base; leaf blade ovate-trapeziform or broadly oblong, 1.2--4.8 × 0.7--2.2 cm, base subtruncate, cordate-truncate, or broadly obtuse, 3--6-dentate. Scapes 1--4, 6--24 cm, sparsely puberulent or glabrescent. Flowers 1, sometimes 2 in monochasium, 1.4--2.4 cm in diam.; bracts lanceolate-linear, 4--13 mm, membranous vaginate at base. Pedicel 2--7.5 cm, sparsely puberulent. Sepals 5, elliptic, 5--7 mm, abaxially puberulent. Petals 6--12, narrowly obovate or obovate-oblanceolate, 0.8--1.2 cm × 3--5 mm, apex rounded. Stamens 50--78; anthers broadly ellipsoid, 0.8--1 mm. Aggregate fruit ovoid, 8--11 × 5--9 mm; achenes obliquely obovate, 2--2.5 × 1.8--2 mm, glabrous. Persistent style 0.5--0.8 mm, straight. Fl. May--Aug, fr. Aug.
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