Stems twining to 1 m, slender, minutely hirsute. Petiole ca. 1 cm; leaf blade broadly ovate, 3-4.5 × 1.5-2.5 cm, membranous, glabrous except for midvein abaxially, base subtruncate, apex short acuminate; lateral veins ca. 3 pairs. Inflorescences umbel-like, 1-8-flowered; peduncle up to 1.3 cm. Pedicel 1.2-2 cm. Sepals subulate-lanceolate, 3-4 mm, glabrous. Corolla 1.5-2.3 cm; tube yellow, 3-4 mm in diam. just above dilated base; lobes dark violet, broadly ovate, ca. 5 mm, papillate at base inside. Outer corona lobes triangular-lanceolate, ca. 2.5 mm, sparsely villous; inner lobes linear, ca. 2 mm. Fl. Aug.

* Montane forests. Yunnan (Yanyuan).