Plants polygamo-dioecious. Branchlets terete, with longitudinal ridges, densely pubescent and sparsely lanate; tendrils unbranched or mixed with bifurcate ones. Leaves simple; stipules ovate-elliptic, 2-3 × 1.5-2 mm, subglabrate, subentire, apex obtuse; petiole 5-10 mm, densely pubescent and lanate; leaf blade oval or ovate-elliptic, 3-5.5 × 2-4 cm, abaxially densely lanate with gray hairs and pubescent with short hairs, adaxially densely pubescent and sparsely lanate, basal veins 5, lateral veins 4 or 5 pairs, veins densely pubescent and with sparse arachnoid tomentum, veinlets densely tomentose and pubescent abaxially, inconspicuous adaxially, base cordate, notch acute, margin with sharp teeth, apex acute or acuminate. Panicle leaf-opposed, 2-8.5 cm, basal branches short; peduncle 0.5-1.5 cm, densely pubescent. Pedicels 1-1.5 mm, densely pubescent. Buds obovoid, 1.5-2 mm, apex rounded. Calyx ca. 0.2 mm, glabrous, 5-lobed. Filaments filiform, 1-1.2 mm; anthers yellow, oblong, ca. 0.5 mm. Ovary abortive in male flowers. Fl. May, fr. Jul.
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