Description from Flora of China
Shrubs or small trees. Leaves alternate, rarely opposite, margin entire or serrate; stipules deciduous. Inflorescences axillary or terminal, racemose, paniculate, or sometimes cymose, rarely flowers solitary. Flowers bisexual, actinomorphic, small. Sepals subequal, leathery. Petals equal or subequal, not spurred. Filaments free or ± connate, inserted inside at top of disk; connectives dilated abaxially from base or from apex into thin, scarious appendages exceeding anthers. Disk circular, slightly 5-lobed. Ovary ovoid, with few or numerous ovules; styles erect; stigmas terminal, not divided. Capsule usually 3-valved, rarely 2-valved. Seeds few, ellipsoid, glabrous or pubescent.
About 340 species: tropical Africa, tropical America, and tropical Asia; four species (one endemic) in China.