Branchlets terete, with longitudinal ridges, with sparse, brownish arachnoid tomentum; tendrils bifurcate, leaf-opposed. Leaves simple; stipules caducous; petiole 4-8 cm, nearly glabrous; leaf blade cordate to ovate-elliptic, 7-16 × 5-12 cm, abaxially with brownish arachnoid tomentum on veins, adaxially glabrous or nearly so, basal veins 5, lateral veins 4 or 5 pairs, veinlets raised, base cordate, notch obtuse, margin 16-20-toothed on each side, apex acute or acuminate. Panicle leaf-opposed, loose, 4-16 cm, with well-developed basal branches; peduncle 1.5-3.5 cm, with sparse arachnoid tomentum. Pedicel 2-3 mm, glabrous. Buds obelliptic, 1.5-3 mm, apex subtruncate. Calyx undulately lobed. Filaments filiform, 1.2-1.6 mm; anthers yellow, ovoid-elliptic, 0.8-1.2 mm. Ovary oval; style short; stigma expanded. Berry globose, 0.7-1.5 cm in diam. Seeds obovoid, apex globose, chalazal knot oblong, raphe slightly raised, surface smooth, ventral holes furrowed from base to nearly 1/4 near apex. Fl. May-Jul, fr. Jun-next Jan.
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