Lianas woody. Cymes extra-axillary, umbel-like or racemelike. Calyx with or without 5 basal glands. Corolla urceolate to campanulate, rarely rotate; lobes 5, twisted to right or subvalvate. Corona lobes 5, scalelike, inserted at base of gynostegium. Filaments connate into a tube; anthers erect, membranous apical appendages as long as or slightly longer than stigma head; pollinia 2 per pollinarium, ovoid-oblong or oblong, erect. Styles short; stigma head vertically conical or convex. Follicles oblong-lanceolate.

About 16 species: Africa, tropical and subtropical Asia, Oceania; two species in China.