Branchlets slender, with longitudinal ridges, glabrous; tendrils unbranched. Leaves simple; stipules caducous; petiole 1.8-3.2 cm, glabrous; leaf blade halberd-shaped or triangular-ovate, undivided or 3-5-lobed, divided leaves with obtuse or acute notch, 4-9.3 × 2.8-4.5 cm, abaxially glabrous, adaxially very shortly strigose on veins, basal veins 5, lateral veins 4 or 5 pairs, veinlets conspicuously raised, base cordate, margin irregularly 7-9-toothed on each side and shortly ciliate, apex long acuminate. Panicles leaf-opposed, 3.8-6 cm; peduncle and pedicels glabrous. Berry globose, 5-8 mm in diam. Seeds obelliptic, chalazal knot elliptic. Fr. Jun-Jul.
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