Plants polygamo-dioecious. Branchlets terete, with longitudinal ridges, sparsely pubescent with simple and stalked glandular hairs, glands 0.8-1 mm; tendrils usually bifurcate. Leaves simple; petiole 4-5.5 cm, sparsely pubescent with simple and glandular hairs; leaf blade oval, conspicuously 3-5-lobed, rarely tripartite or 3-divided, notch obtuse, rarely acute, 11-16 × 9-14 cm, abaxially sparsely pilose, then glabrescent, adaxially nearly glabrous, basal veins 5, lateral veins 5 or 6 pairs, pilose with spreading hairs, rarely glabrous, base cordate, margin irregularly 25-32-toothed, teeth large and obtuse, apex acuminate or mucronulate, rarely acute. Panicle leaf-opposed, loose, 8-9 cm, with well-developed basal branches; peduncle 1.5-2 cm, nearly glabrous. Pedicel 3-4 mm, glabrous. Buds obovoid, 2-2.5 mm, apex rounded. Calyx cupular, glabrous, entire. Filaments filiform, 1.7-2 mm; anthers yellow, elliptic, ca. 0.5 mm. Pistil abortive in male flowers. Berry purple-black at maturity, globose, ca. 1.2 cm in diam. Seeds obovoid, apex retuse, surface smooth. Fl. Jun, fr. Oct.
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