Vines scandent. Branchlets terete or 4-angled, narrowly winged, glabrous. Leaves opposite, simple; petiole 1-2 cm, articulate at middle; leaf blade ovate, elliptic, or ovate- lanceolate, 10-22 × 4.5-10.5 cm, leathery, glabrous, sparsely glandular dotted abaxially, base rounded, rarely broadly cuneate or subcordate, apex short caudate; primary veins 5-9 on each side of midrib, at 50-60° to midrib. Racemes subopposite or fascicled in leaf axils, 3-10-flowered; bracts ovate or spatulate, 2-5 mm, fleshy. Pedicel 1-7 mm, thickened upward. Calyx puberulent; tube ca. 4 mm; lobes 5, narrowly deltate, 1-2 mm. Corolla white, fleshy; tube ca. 2.2 cm; lobes 7, lanceolate, 1-1.2 cm, base auriculate. Berry purple-black, ellipsoid, 2.3-2.7 × 1.5-1.8 cm. Fl. Mar, fr. May.