Lianas or scandent subshrubs. Leaves opposite, long petiolate. Inflorescences long pedunculate, racemelike with cymules laxly arranged along well-developed rachis. Calyx with 5 basal glands. Corolla subrotate; lobes longer than tube, twisted to left. Corona ringlike, inserted at base of gynostegium, rim 5-lobed; lobes hoodlike. Filaments connate into a short tube; anther appendages incurved; pollinia 2 per pollinarium, oblong or ovate-oblong, pendulous. Stigma head long beaked, 2-cleft or entire, exserted beyond anther appendages. Follicles fusiform or oblong, pericarp muricate, rugose, or smooth. Seeds ovate.
"Cor campanulately subrotate, deeply cleft, the narrow lobes densely bearded on the upper side; corona very short, the 5 broadly rounded lobes alternating with the anther-bases; anthers terminating in a conspicuous, inflexed membrane; pollinia solitary in each pollen-sac, pendulous, apically attached to the translator; style with a slender tip prolonged far past the anthers; twining shrubs or herbs with cordate lvs and pedunculate extra-axillary cymes solitary at the nodes. 6, e. Asia."