Description from Flora of China
Shrubs to 4 m tall, climbing. Branchlets puberulent when young. Petiole 5-7 mm, puberulent; leaf blade oblong-elliptic, 7-13.5 × 3-5.5 cm, papery, glabrous except for abaxially puberulent midvein, adaxially minutely punctate, secondary veins 12-14 on each side of midvein and adaxially prominent, base cuneate to broadly cuneate and oblique, apex acuminate to obtuse. Peduncle puberulent. Flowers 3-4 cm in diam. Pedicel 1.5-2 cm. Sepals broadly ovate-triangular, 5-7 mm, puberulent, basally slightly attenuate. Petals brownish green; outer petals oblong-ovate, ca. 2.5 cm, base concave; inner petals ca. 2 cm, concave and connivent, horizontally spreading from apical 1/3, basally attenuate. Stamens many, cuneate, ca. 1.5 mm; connectives apically subtruncate, glabrous. Carpels ca. 20, oblong, glabrous; stigmas clavate, longer than ovaries, pubescent. Monocarps fusiform, slightly flattened, 3.5-4 × 1.5-1.7 cm. Fl. Apr-Jun, fr. Sep-Nov.
● Open woods; ca. 1500 m. S Yunnan.