Herbs perennial climbers to 3 m. Stems, leaves, petioles, and pedicels puberulent. Petiole 1.5-3 cm, with adaxial glands; leaf blade ovate, ovate-triangular, or oblong-lanceolate, 5-8.5 × 3-5 cm, papery, base cordate with rounded enlarged lobes, apex short acuminate; lateral veins 6 or 7 pairs. Inflorescences 1.3-2.1 cm; peduncle 1-2(-6) mm. Pedicel 0.8-1.5 cm. Sepals ovate-oblong, 4-4.5 × 1-1.5 mm, glabrous, ciliate; basal glands 10. Corolla purple, rotate, membranous, ca. 1.7 cm in diam.; tube ca. 1 mm; lobes oblong, 5-8.5 × 2.5-3.5 mm, glabrous outside, puberulent inside, apex obtuse. Corona deeply 5-lobed; lobes oblong, 5-5.5 × 1.5-2 mm, longer than gynostegium, base ± fleshy, apical part membranous, retuse, with a fleshy adaxial, ligulate appendage. Anther appendages broadly ovate; pollinia oblong. Stigma head discoid, apex conical. Fl. Aug.

* Thickets. Sichuan.