Lianas, woody. Branchlets terete, with longitudinal ridges, glabrous; tendrils bifurcate. Leaves simple; stipules oval, membranous; petiole 2.5-4.5 cm, glabrous; leaf blade cordate-oval, 5-5.8 × 3-5.5 cm, glabrous, basal veins 5, lateral veins 3 or 4 pairs, base cordate, notch rounded, margin with 20-27 sharp teeth on each side, apex acuminate. Inflorescence umbelliform, leaf-opposed; peduncle 2-4 cm, glabrous. Pedicel 1-3 mm, glabrous. Buds ovoid-elliptic, 2-2.5 mm, apex rounded. Calyx undulately lobed. Petals oval, 1.5-2 mm, glabrous. Anthers elliptic. Disk 4-lobed. Lower part of ovary adnate to disk, glabrous; style conical; stigma slightly expanded. Fl. Aug.
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