Herbs perennial, with stout rhizome, andromonoecious or androdioecious. Radical leaves simple, sometimes with 1 or 2 minute ovate or elliptic lobules on distal part of petiole. Scape with a few 3-sect bracts. Flower 1(or 2), terminal. Hypanthium obconic or turbinate. Sepals 5, valvate; epicalyx segments 5, smaller than sepals. Petals 5, white. Stamens numerous, inserted on margin of hypanthium. Disk annular, glabrous. Carpels shortly stipitate at base of ovary; those in male flowers few, sterile, glabrous; those in female flowers many, spirally inserted on receptacle, pilose; style terminal, elongated; stigma slightly dilated. Achenes pilose. x = 7*.

One species.

(Authors: Li Chaoluan (Li Chao-luang); Hiroshi Ikeda, Hideaki Ohba)