Plants polygamo-dioecious. Branchlets terete; old branches with conspicuous longitudinal ridges, glabrous; tendrils bifurcate. Stipules ovate-elliptic or lanceolate, 1.5-3 × 1-1.5 cm, glabrous, apex obtuse, caducous; petiole 2-6.5 cm, glabrous; leaf blade ovate or ovate-elliptic, 6.5-22.5 × 4.5-13.5 cm, abaxially glaucous, rarely glaucescent, basal veins 5-7, lateral veins 5-7 pairs, veinlets inconspicuous, base cordate, margin 12-22-toothed on each side, teeth small, apex acute, acuminate, or caudate. Panicle leaf-opposed, loose, 5-9 cm, base with well-developed branches, occasionally basal branches reduced to tendrils; peduncle 1-2 cm, pubescent or nearly glabrous. Pedicel 1.2-2 mm, glabrous. Buds globose or elliptic, 1-1.5 mm, glabrous. Calyx ca. 2 mm, glabrous. Filaments filiform, 0.5-0.7 mm; anthers yellow, elliptic, ca. 0.4 mm. Ovary oval; style short, slender; stigma expanded. Berry purple-black at maturity, globose, 0.8-1.2 cm in diam. Seeds obovoid, apex retuse, chalazal knot elliptic.