Description from Flora of China
Shrubs to 5 m tall, climbing, glabrous except for flowers. Petiole 2-8 mm; leaf blade oblong to oblong-ovate, 4-15 × 1.8-5.5 cm, papery, secondary veins 8-10 on each side of midvein and slightly prominent on both surfaces, base cuneate to rounded, apex acuminate to acute. Inflorescences extra-axillary, often leaf-opposed, 1- or 2-flowered. Pedicel 2.5-5.5 cm, bracteolate below middle. Sepals ovate, 2.5-3 mm, margin ciliate. Petals purple, leathery, puberulent; outer petals broadly ovate, ca. 1 × 1 cm; inner petals slightly smaller than outer petals, inside concave. Stamen connectives apically truncate, papillary. Carpels oblong, incurved, densely yellow pubescent; ovules 6-8 per carpel; stigmas horseshoe-shaped, apex 2-cleft. Monocarp stipes 4-5.5 cm; monocarps purple, globose to ellipsoid-ovoid, ca. 1.3 cm in diam. Fl. May-Oct, fr. Jun-Apr.
Moist secondary forests, thickets; 100-800 m. Guangdong, Guangxi, Guizhou, Hainan, Jiangxi [Vietnam].