Description from Flora of China
Vines woody, 3-4 m. Branchlets terete, pubescent. Leaves opposite, simple; petiole 2-5 mm, articulate at middle, pubescent; leaf blade drying blackish, ovate or narrowly so, 1.8-4.5 × 1.5-2.4 cm, leathery, glabrous except for puberulent midrib, 3-5-veined, base rounded or subcordate, apex acute and mucronate. Flowers solitary or in fascicles of 3, terminal or axillary; bractlets linear, 2-9 mm. Pedicel 1-7 mm, pubescent or glabrescent. Calyx glabrous; tube 2-3 mm; lobes linear, 4-6 mm. Corolla white; tube 1.7-2 cm; lobes 8, lanceolate or oblong-elliptic, 1.4-1.6 cm. Berry didymous. Fl. Aug.
* Valleys, woods; 400-600 m. Guangxi (Longzhou Xian)