Shrubs climbing, slightly herbaceous. Stems terete, striate, sparsely villous or glabrous. Petiole 3-4 cm, pilose to glabrous; leaf blade oblong-lanceolate to narrowly ovate, 12-16 × 4-6.5 cm, papery, abaxially sparsely villous, adaxially glabrous, veins palmate, 4-5 pairs from base, base auriculate, sinus 1-1.5 cm deep, apex acute to shortly acuminate. Flowers in axils of leafy shoots, solitary. Peduncle often pendulous, ca. 3 cm, pilose; bractlets subulate, ca. 3 × 1 mm, inserted on basal 1/2 of peduncle. Calyx yellowish, ca. 3 cm; tube horseshoe-shaped, abaxially glabrous to pilose; basal portion of tube ca. 15 × 8 mm; limb oblique, unilaterally 3-lobed; lobes ovate-lanceolate or oblong-lanceolate, ca. 6 × 4 mm. Anthers oblong, ca. 1 mm. Gynostemium 3-lobed. Capsule not seen. Fl. Jun.

This species is used medicinally.

* Mixed forests, mountain slopes, moist shady areas; 2200-2600 m. Yunnan.