Branchlets terete, with longitudinal ridges; tendrils bifurcate, leaf-opposed. Stipules brown, oval to oblong, 2-4 × 1.5-3 mm; petiole 2-5 cm; leaf blade adaxially green, cordate-oval or broadly ovate, 4-14 × 3.5-9.5 cm, basal veins 5, lateral veins 4-6 pairs, veinlets conspicuous and raised, base cordate, notch obtuse, margin with 16-22 fine teeth on each side, slightly undulate, apex acute or mucronulate. Panicle leaf-opposed, 4-13 cm. Pedicel 1-1.5 mm. Buds obovoid, 1-1.4 mm, apex rounded. Calyx cupular, entire. Petals galeate. Filaments filiform in male flowers, 0.6-1 mm; anthers yellow, elliptic, ca. 0.4 mm; stamens shorter than pistils in female flowers, abortive. Disk 0.3-0.4 mm. Ovary conical; style short; stigma slightly expanded. Berry purple-black at maturity, globose, 5-8 mm in diam. Seeds obovoid, apex rounded, chalazal knot elliptic.