Lianas to 5 m. Branches pubescent along 2 lines. Petiole 5-13 mm, pubescent; leaf blade ovate, 3.5-6 × 1.2-2.8 cm, membranous, base broadly cuneate or rounded, margin ciliate, glabrous or glabrescent, apex acuminate; lateral veins 3 or 4 pairs. Inflorescences 10-12-flowered; peduncle and pedicel glabrous. Sepals lanceolate, glabrous, ciliate. Corolla green outside, margin reddish; lobes ovate-oblong, 3-4 × ca. 2.5 mm, pubescent inside. Ovaries glabrous. Fl. May.

* Montane forests; ca. 1400 m. SE Yunnan.