Lianas. Leaves opposite, stipulate. Cymes extra-axillary, short pedunculate, racemelike, usually simple. Flowers large. Calyx glands present. Corolla subrotate, thick; lobes longer than tube, overlapping to right. Corona ringlike, inserted at base of gynostegium, deeply 5-lobed; lobes erect, membranous, revolute, separated by truncate sinus, shorter than anthers. Filaments connate into a tube; anthers somewhat concave at middle, appendages rounded, covering stigma head; pollinia 2 per pollinarium, oblong, pendulous. Stigma head elevated. Follicles ovoid-cylindric, woody. Seeds ovate.

One species: China, Vietnam.