Plants: rhizomes proliferating underground. Flowering stems (20-)50-130 cm. Basal leaves: petiole 5-25(-40) cm; blade usually reniform, sometimes cordate, 3-7-lobed to 1/2-3/4 its length, 5-15(-22) × 7-18(-26) cm, margins 2-3-times dentate. Cauline leaves: stipules (2-)6-20(-35) mm, foliaceous, smaller ones fringed with brown hairs. Inflorescences corymbiform, 8-15(-21)-flowered per primary branch. Pedicels densely stipitate-glandular. Flowers: hypanthium saucer-shaped, free portion 1-2 mm, densely stipitate-glandular; sepals spreading, triangular, 2-4 mm, apex acute; petals suborbiculate to ovate, 4-7 × 2-5 mm, ca. 2 times as long as sepals, base contracted to claw 0.5-3 mm, margins undulate; nectary yellow; stamens (1.6-)2-3 mm; ovary inferior. Capsules ovoid, turbinate, or urceolate. Seeds usually black, tuberculate. 2n = 28.
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