Lianas, woody. Branchlets terete, with longitudinal ridges, brownish pubescent; tendrils unbranched. Leaves simple; stipules ovate, membranous; petiole 1.5-3.5 cm, with dense brownish hairs; leaf blade cordate-oval, 5-8 × 3.5-6 cm, adaxially with slightly stiff hairs, basal veins 5, lateral veins 3 or 4 pairs, with appressed hairs on veins, base cordate, notch rounded, margin with 35-40 sharp teeth on each side, apex acuminate. Inflorescence umbelliform, leaf-opposed; peduncle 1-2.7 cm, sparsely pubescent. Pedicel 1.5-3 mm, glabrous. Buds ovoid-elliptic, 2-2.5 mm, apex rounded or obtuse. Calyx undulately lobed. Petals oval, ca. 2 mm, glabrous. Anthers elliptic. Lower part of ovary adnate to disk, glabrous; style conical; stigma inconspicuously expanded. Fl. Jul-Aug.
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