Lianas. Stems uniformly pubescent when young, soon glabrescent and pubescent along 1 side. Petiole ca. 2 cm; leaf blade ovate, to 9.4 × 4.2 cm, prominently pilose along veins when young, glabrescent, base broadly cuneate to rounded, apex acuminate; lateral veins 4 or 5 pairs. Cymes to 8 cm; cymules umbel-like, ca. 6-flowered; peduncle to 4.5 cm. Pedicel ca. 1.5 cm. Sepals ca. 3 × 0.4 mm, ciliate. Corolla yellow-green, ca. 6 mm; lobes ca. 1.6 m wide, glabrous. Corona lobes reaching base of anthers, acute. Gynostegium ca. 1.5 mm high; corpuscula longer than ellipsoid pollinia.

* Forest margins; ca. 2100 m. Yunnan.