Plants polygamo-dioecious. Branchlets terete, slender, with longitudinal ridges, densely pubescent, eventually glabrescent; tendrils bifurcate, leaf-opposed. Leaves simple; stipules brownish, lanceolate, 1.5-2 × 0.5-1 mm, membranous, sparsely pilose or glabrate; petiole 1-3 cm, pubescent; leaf blade oval, 3-5 × 2-3 cm, 3-5-lobed or parted, abaxially pubescent, adaxially sparsely pubescent when young, then glabrescent, basal veins 5, lateral veins 3 or 4 pairs, base subcordate or subtruncate, notch retuse to obtuse, rarely acute or rounded, margin 5-9-toothed on each side, teeth obtuse, apex acute or acuminate. Panicle leaf-opposed, 2-4.5 cm, narrow, basal branches well developed; peduncle 1-1.5 cm, pubescent or subglabrate. Pedicel 2-3 mm, glabrous. Buds ovoid-elliptic, 1.5-2 mm, apex rounded. Calyx subentire. Filaments filiform, 1.3-1.5 mm; anthers yellow, elliptic, ca. 0.4 mm. Pistil abortive in male flowers. Fl. May.
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