Branchlets terete, glabrous, with sparse arachnoid tomentum when young; tendrils 2-or 3-branched. Leaves simple; stipules brown, 4-8 × 3-5 mm, membranous, entire, apex obtuse; petiole 4-14 cm, with sparse arachnoid tomentum when young, eventually glabrate; leaf blade broadly oval, 6-24 × 5-21 cm, adaxially with sparse arachnoid tomentum when young, then glabrescent, basal veins 5, lateral veins 5 or 6 pairs, veins raised abaxially, conspicuous or slightly impressed adaxially, abaxial veinlets conspicuous, ± raised, usually pubescent or glabrescent, base cordate, notch rounded to obtuse, base of lobes usually constricted or mixed with broad ones, notch rounded, rarely acute or obtuse, margin 28-36-toothed on each side, teeth sharp, slightly irregular, apex acute or acuminate. Panicle leaf-opposed, loose, 5-13 cm, basal branches well developed, with sparse arachnoid tomentum when young, eventually glabrescent. Pedicel 2-6 mm, glabrous. Buds obovoid, 1.5-3 mm, apex rounded. Calyx 0.2-0.3 mm, glabrous, subentire. Petals calyptrate. Filaments filiform, 0.9-2 mm; anthers yellow, ovoid-elliptic, 0.4-0.6 mm, conspicuously short and abortive in female flowers. Disk 0.3-0.5 mm. Ovary conical; style obvious, slightly thick at base. Seeds obovoid, apex retuse, chalazal knot elliptic, ventral holes furrowed upward to middle or near apex from base. Fl. May-Jun, fr. Jul-Sep.
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A vine or shrub. It grows 15 m high and spreads 3-6 m wide. The young shoots are reddish. The leaves are large and have 3-5 lobes. The turn rich red, orange or purple in autumn. The fruit is oval and black. They can be 1.5 cm across. They are often bitter.
It is a temperate plant. It does best in rich, moist soils. It needs an open, sunny position. It is resistant to frost. It is sensitive to drought. It can tolerate winter temperatures down to-40°C. It suits hardiness zones 4-9. In Sichuan.
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Rich damp woodland soils.
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