Branchlets terete, with longitudinal ridges, densely pubescent; tendrils unbranched, leaf-opposed. Leaves simple; stipules caducous; petiole 3-4 cm, sparsely pubescent; leaf blade oval or ovate-elliptic, usually 3-lobed, rarely 3-5-cleft, 7-9 × 6-7 cm, adaxially pubescent on veins at lower part, basal veins 5, lateral veins 3 or 4 pairs, veinlets conspicuously raised abaxially, inconspicuous adaxially, base slightly cordate or subtruncate, lobes with base cordate, notch obtuse or acute, rarely rounded, margin undulately 8-12-toothed on each side, apex acuminate or mucronulate. Panicle leaf-opposed, subcylindric, 4-4.5 cm, narrow, basal branches well developed; peduncle 2-2.7 cm, pubescent. Pedicel 2-2.5 mm, glabrous. Buds obovoid, 1.8-2 mm, apex rounded. Calyx ca. 1.5 mm, subentire. Filaments filiform. Disk well developed, slightly 5-lobed. Pistil abortive in male flowers. Fl. Apr.
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