Wattakaka yunnanensis Tsiang, Sunyatsenia 4: 126. 1939; Dregea yunnanensis var. major (Tsiang) Tsiang & P. T. Li; Wattakaka yunnanensis Tsiang var. major Tsiang.

Lianas to 6 m, tomentose except for corolla and gynostegium; older stems sometimes with corky ridges. Branches lenticellate. Petiole to 2.5 cm; leaf blade ovate, 1.3-8 × 1-5.5 cm, papery, base shallowly cordate, apex acute; lateral veins ca. 4 pairs. Inflorescences to 5 cm, to 15-flowered. Sepals ovate. Corolla white; tube very short, pilose inside, with a prominent ciliate rim; lobes ovate, 5-8.5 × 3.5-4.5 mm, veined, glabrous with ciliate margin. Corona lobes with outer angle rounded; gynostegium ca. 1.5 mm. Anther appendages oblong, as long as corona lobes; pollinia oblong. Ovaries pilose. Stigma head conical, apex 2-cleft. Follicles lanceolate in outline, 3.5-5 cm × 5-7 mm, puberulent to glabrous, smooth. Seeds ovate, ca. 7 × 4 mm; coma ca. 2 cm. Fl. Apr-Aug, fr. Jul-Nov.

* Forests; to 3500 m. Gansu, Sichuan, Xizang, Yunnan.