Description from Flora of China
Shrubs or small trees. Leaves alternate, shortly petiolate. Inflorescences axillary or terminal cymes. Sepals 5, persistent. Petals 5, white, basally with a narrow long claw confluent with other claws almost into a tube; lobes broadly obovate, patent. Stamens 5; filaments basally slightly expanded and connate into tube; staminodes 5, subulate, alternating with stamens. Ovary glabrous, 4- or 5-loculed with 2 ovules per locule; styles 4 or 5, as long as stamens; stigmas capitate. Capsule long ellipsoid, ovoid-ellipsoid, or ovoid, septicidal, 4- or 5-valvate. Seeds with a membranous wing.
Three species: China, N Thailand, Vietnam; two species in China.