Lianas to 3 m. Branches pubescent along 2 lines, longitudinally striate, sometimes glabrescent. Petiole 1-5 cm, flattened, puberulent; leaf blade ovate or elliptic, 5-17 × 3-10 cm, glabrous or puberulent when young, base rounded, apex acuminate or obtuse; basal veins 3, lateral veins 3 or 4 pairs. Inflorescences shorter than leaves, few flowered; peduncle 0-7(-10) mm. Pedicel 5-10 mm. Corolla yellow-green, 6-8 mm in diam. Corona lobes obcordate to orbicular, exceeding gynostegium. Stigma head centrally depressed. Fl. Jul-Sep.

Open woods, often climbing trees; 800-2100 m. S Yunnan [India, Nepal].