Plants polygamo-dioecious. Branchlets terete, with longitudinal ridges, glabrous; tendrils bifurcate. Leaves simple; stipules brownish, lanceolate, 2.5-3 × 1-1.2 mm, membranous, glabrous, caducous; petiole 1-3.5 cm, glabrous; leaf blade ovate-elliptic or ovate-lanceolate, 4-15 × 2-8 cm, abaxially glabrous, glaucous, basal veins 3, lateral veins 4 or 5 pairs, veinlets raised, glabrous, base truncate, rounded, or subrounded, rarely subcordate, margin sparsely 7-9-toothed on each side, teeth sharp, apex acuminate or caudate, rarely acute. Panicles leaf-opposed, terete, 3.5-10 cm, basal branches poorly developed; peduncle 1.5-2.5 cm, pubescent when young, then glabrescent. Pedicel 1-2.5 mm, glabrous. Buds obovoid, 1-1.4 mm, apex rounded. Calyx entire. Filaments filiform, 0.8-1.2 mm; anthers yellow, elliptic, 0.4-0.5 mm. Ovary oval; style short; stigma expanded. Berry purple-red at maturity, globose, 8-10 mm in diam. Seeds obelliptic, apex rounded, chalazal knot elliptic, ventral holes obelliptic, furrowed upward 3/4 from base.
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