Branchlets terete, with longitudinal ridges, glabrous; tendrils bifurcate. Leaves simple; petiole 2.5-6 cm, glabrous; leaflets ovate or ovate-elliptic, undivided or slightly 3-lobed, 7-12.5 × 5-12 cm, basal veins 5, lateral veins 4-6 pairs, veinlets inconspicuously raised, base cordate or slightly so, margin with 9-19 sharp teeth, apex cuspidate or acuminate. Compound dichasium loose; peduncle 2.5-6 cm, glabrous. Pedicel 2.5-3 mm, glabrous. Buds elliptic, 2.5-3 mm. Calyx teeth inconspicuous, glabrous, margin undulate. Petals elliptic, 2-2.5 mm. Filaments filiform; anthers yellow, elliptic. Disk 5-lobed. Ovary conical; style slightly enlarged at base. Berry 6-8 mm in diam., 3-or 4-seeded. Seed ovoid-elliptic, slightly flat, rostrum acute, surface smooth, chalazal knot zonate and attenuate, ventral holes furrowed. Fl. Apr-Jun, fr. Jul-Aug.
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