Description from Flora of China
Lianas, woody at base. Cymes extra-axillary, lax, racemelike or umbel-like, rarely a solitary flower, pedunculate. Flower buds globose. Calyx glands 5 or many. Corolla bowl-shaped; lobes basally valvate and apically overlapping to right. Corona in 2 series: outer corona at base of corolla tube, annular, truncate, margin membranous; inner series of 5 ovate-lanceolate lobes attached to gynostegium and exceeding anthers. Filaments short, connate into a tube; anthers with appendages; pollinia 2 per pollinarium, pendulous, on long translator arms. Stigma head convex. Follicles solitary or paired, oblong or ovate-lanceolate in outline, smooth.
Two species: tropical and subtropical Asia, tropical Africa; one species in China.