Shortly rhizomatous erect, robust perennial; rootstock thick. Basal leaves with petioles 4–28 cm long, glabrous to pilose; lamina orbicular, 5–8 (–13) cm diam., deeply palmately 3–5-cleft, with segments digitately split into spreading and ± overlapping coarsely dentate lobes, glabrous to pilose above, glabrous to subsericeous below; cauline leaves stem clasping, the lowermost similar to basal leaves, the upper smaller with narrower segments. Flowering stems 1–4-flowered, c. 15–35 cm or more high; pedicels pilose or subglabrous. Sepals 5–7, ovate, 1–1.5 cm long, acute, obtuse, apiculate or variably toothed or notched at apex, sericeous below. Petals usually 15–35, white, narrowly obovate or obovate-cuneate, 1.5–3 cm long; nectary near petal-base, a lobeless, shallow circular to oblong pit. Stamens c. 55–100. Pistils c. 120–170. Receptacle glabrous to sparsely pilose throughout. Achenes ± obovate, c. 3 mm long, turgid, smooth; beak 2–2.5 mm long, straight or recurved.
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