Description from Flora of China
Shrubs climbing, usually with tendrils, unarmed. Leaves alternate, with caducous stipules, petiolate, pinnativeined or 3-veined from base, margin entire or dentate. Flowers polygamous, in terminal or axillary, cymose racemes or cymose panicles, often with tendrils at lower part of rachis or base. Calyx tube short, coadnate with ovary; sepals 5, ovate-triangular, adaxially medially keeled, dehiscent with longitudinal slits. Petals 5, spatulate. Stamens 5, dorsifixed, enfolded by petals. Disk thick, pentagonous or 5-lobed, glabrous or hairy. Ovary inferior, ± deeply immersed in disk, 3-loculed, with 1 ovule per locule; styles cleft to half or deeply cleft. Capsule subglobose, impressed on both ends, crowned by persistent limb of calyx, 3-winged, with 3 rounded locules split from axil at maturity; locules indehiscent or along inner rib narrowly fissured. Seeds 3, red-brown, shiny, obovoid; endosperm thin.
Twenty species: tropical and subtropical areas; two species in China.