Description from Flora of China
Herbs perennial. Rhizome short. Stolons procumbent, long, filiform, bearing adventitious roots and forming plantlets at nodes. Radical leaves several, stolon leaves alternate, long petiolate; stipules paired, adnate to base to petiole, persistent; leaf blade 3-foliolate; leaflets dentate at margin. Inflorescence axillary, ebracteate, a solitary flower. Sepals 5, persistent; epicalyx segments 5, larger than and alternating with sepals, margin incised. Petals 5, yellow, obovate. Stamens numerous; anthers subglobose. Carpels numerous, free, inserted on convex receptacle; style adaxial or subterminal, deciduous; stigma entire. Aggregate fruit formed from enlarged receptacle, hemispheric or turbinate, fleshy. Achenes seated on surface of aggregate fruit, compressed ovoid, minute. Seed reniform, smooth. x = 7.
Two species: Afghanistan, Bhutan, China, India, Indonesia, Japan, Korea, Malaysia, Nepal, Sikkim; naturalized in Africa, Europe, and North America; two species in China.
(Authors: Li Chaoluan (Li Chao-luang); Hiroshi Ikeda, Hideaki Ohba)