Vines, herbaceous. Branchlets terete, with longitudinal ridges, usually glaucous, glabrous; tendrils unbranched. Leaves simple; petiole 2.5-8 cm, glabrous; stipules oval, 4-6 × 3-4 mm, glabrous; leaf blade heteromorphic, undivided or 3-5-divided, glabrous, basal veins 3-5, lateral veins 5-7 pairs, veinlets slightly raised; undivided leaves oval, 7-7.5 × 5-5.5 cm, base cordate, notch obtuse, margin 20-30-toothed on each side, teeth sharp, apex acute or acuminate; divided leaves broadly ovate, base cordate, deeply 3-5-lobed, notch narrow or two sides overlapping, lobes lanceolate, apex acuminate. Compound dichasium terminal or leaf-opposed; peduncle 3-5.5 cm, glabrous. Pedicel 2-6 mm, glabrous. Buds elliptic or globose, 2-3 mm, apex rounded. Calyx undulately lobed. Petals oval or ovate-elliptic, 1.7-2.7 mm, glabrous. Anthers oval. Lower part of ovary adnate to disk; style conical; stigma slightly expanded. Berry 5-6 mm in diam., 1-seeded. Seed oval, surface smooth, raphe raised, ventral holes slightly furrowed. Fl. Jun-Oct, fr. Aug-Nov.
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