Lianas woody, latex white. Leaves opposite. Cymes broadly paniculate, terminal or axillary, pedunculate. Flowers small. Calyx deeply divided, with many nectar glands inside. Corolla salverform or subcampanulate, tube short; throat broad, not scaly; lobes overlapping to left, spreading or reflexed. Stamens inserted at base of corolla tube; filaments short; anthers included, sagittate, connivent, adherent at middle to pistil head, cells with an empty tail; disc scales 5. Ovaries 2, free, longer than disc; ovules numerous in each locule. Style short; pistil head conical, apex obscurely 2-cleft. Follicles moniliform, with widely separated swellings, pendulous, elongated. Seeds fusiform, coma apical, early deciduous; endosperm scanty; cotyledons oblong, radicle short.

About four species: SE Asia, one species in China.