Description from Flora of China
Herbs perennial, low, tufted, with stout rootstock. Radical leaves pinnate; leaflets numerous, margin cleft or toothed; cauline leaves few, reduced. Flowers terminal, solitary or very few in cymes. Hypanthium ± turbinate. Sepals 5, valvate; epicalyx segments smaller, alternate with sepals. Petals 5, yellow. Stamens numerous, inserted at mouth of hypanthium. Carpels numerous, densely hirsute or only sparsely so near apex, apically tapered into persistent, glabrous style; ovule basal; style not elongating in fruit. x = 7.
About 15 species: E Asia, North America; two species in China.
(Authors: Li Chaoluan (Li Chao-luang); Hiroshi Ikeda, Hideaki Ohba)