Description from Flora of China
Shrubs scandent, 1-9 m. Branchlets terete or blunt angular, hollow, pubescent or glabrous. Leaves opposite, simple; petiole 0.5-1.8 cm, articulate at basal part, twisted; leaf blade broadly ovate to elliptic or suborbicular, rarely lanceolate, 4-10 × 1.5-6.5 cm, leathery, glabrous, 3- or 5-veined from base, base rounded or broadly cuneate, rarely cordate, apex acuminate or caudate-acuminate. Cymes congested in heads, terminal or axillary, many flowered; bracts at base of inflorescences leafy, 1-2 cm. Flowers heterostylous. Pedicel 1-5 mm, thickened in fruit, pubescent. Calyx lobes 6-7, linear, 5-8(-14) mm. Corolla white; tube 2-3 cm; lobes 6-9, lanceolate or oblong, 1-2 cm. Berry black, globose, ellipsoid, or reniform, 0.9-1.8 cm × 6-10 mm. Fl. Aug-Feb, fr. Feb-May of following year. 2n = 26*.
Valleys, thickets, mixed forests; below 900 m. Guangdong, Guangxi, Hainan [Vietnam]