Lianas. Stems slender, short pilose along 2 sides. Petiole 5-10 mm, adaxially hairy, glabrescent; leaf blade lanceolate, 2.5-4 × 1.1-1.2 cm, thick papery, glabrous, with prominent scattered tubercles, base rounded-cordate, apex acute. Inflorescences up to 4 cm, much branched, peduncle up to 6 mm, internodes to 1.4 cm. Pedicel 4-6 mm, glabrous. Sepals lanceolate, ca. 0.7 mm, glabrous, tip recurved, acute. Corolla greenish white, rotate to shallowly bowl-shaped, ca. 5 mm in diam., glabrous outside, densely short pilose inside; lobes ovate, ca. 2 × 1.5 mm. Corona lobes reaching base of anther, with prominent, spreading, truncate or subemarginate dorsal appendages, joined at base. Anther appendages short, rounded; pollinia ellipsoid, almost vertical. Stigma head rounded. Old follicles linear lanceolate in outline, ca. 6.5 cm × 5 mm. Fl. May.

* ca. 800 m. Yunnan.