Branchlets usually purple, terete, with longitudinal ridges, glabrous; tendrils bifurcate. Leaves simple; stipules caducous; petiole 2.5-5 cm, glabrous; leaf blade ovate-oblong or ovate, 12-18 × 4-12 cm, basal veins 5, lateral veins 5 or 6 pairs, veinlets conspicuously raised, base cordate, notch obtuse, margin with 15-21 fine teeth on each side, apex acuminate. Panicle leaf-opposed, ca. 17 cm at fruiting stage, with well-developed branches; peduncle ca. 2.5 cm. Pedicel 4-7 mm, nearly glabrous. Berry globose, ca. 0.5 mm in diam. Fr. May-Jul.
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