Lianas to 1.5 m. Branches dark brown, lenticellate; branchlets slender, glabrous. Petiole 5-10 mm, with an apical adaxial group of subulate glands; leaf blade ovate-triangular, 1-2.5 × 1 cm, adaxially pubescent on veins, abaxially gla-brous and densely papillate, base rounded to shallowly cordate, margin translucent, apex acuminate; lateral veins 3 or 4 pairs. Inflorescences umbel-like, 3-6-flowered; peduncle 1-1.5 cm; bracteoles lanceolate, 3-5 mm. Pedicel 5-6 mm. Sepals lanceolate, ca. 3 mm. Corolla urceolate, 5-6 mm; tube interior sparsely pubescent with reflexed hairs; lobes ovate-oblong. Corona ringlike, apex wavy, slightly longer than an-thers. Anthers square, appendages triangular; pollinia large. Stigma head short conical, apex 2-cleft. Fl. May.

* Thickets on dry land; 2000-2500 m. Sichuan (Yanyuan).