Lianas to 3 m. Stems pale gray, yellowish pubescent along 1 side. Petiole 1.5-2.5 cm, adaxially puberulent; leaf blade elliptic-oblong to oblong-lanceolate, 6.5-14 × 1.7-4 cm, base rounded, apex long acuminate; lateral veins 4-6 pairs. Inflorescences 6-18 cm; peduncle to 3 cm, shorter than apical internodes of rachis; rachis almost straight, usually branched; cymules umbel-like. Pedicel slender, 4-10 mm. Sepals ovate-oblong, ca. 1.5 × l mm. Corolla greenish, rotate, glabrous; tube ca. 1.5 mm; lobes ovate, ca. 3 × 2 mm. Corona lobes ovate, pouched, apex obtuse and reaching anther base. Anther appendages rounded; pollinia subglobose, suberect. Stigma head discoid, apex slightly dome-shaped. Fl. May-Sep.

* Open woods; 1000-2000 m. Guizhou, S Yunnan.