Chimaza R. Brown ex de Candolle; Pipseva Rafinesque; Pseva Rafinesque.

Herbs perennial, decumbent or shrubs dwarf, erect, evergreen. Leaves opposite or subverticillate, shortly petiolate, often crowded; leaf blade leathery, margin serrate. Flowers solitary, terminal, or 1 or 2 on simple or branched, bracteate peduncles, nodding, regular. Sepals 5, persistent. Petals 5, concave. Filaments pilose; anthers opening by pores. Ovary depressed-globose, 5-locular; style obconic, straight, very short. Capsules depressed-globose, long persistent, erect. n = 13.

Five species: Bhutan, China, Japan, Korea, Russia; Europe, North America, Central America (Mexico); three species (one endemic) in China.

(Authors: Qin Haining (覃海宁); Peter F. Stevens)