Plants slender. Branchlets gray-brown, conspicuously 5-ridged, glabrous; tendrils bifurcate. Leaves simple; stipules caducous; petiole 1-2.5 cm, glabrous; leaf blade ovate-pentagonal, 0.8-6 × 1-7 cm, glabrous, basal veins 3-5, veinlets inconspicuously raised, margin with 5 deep lobes, notch cordate, lobes lanceolate or narrowly rhombic, apex acuminate. Compound dichasium leaf-opposed; peduncle 2.2-3 cm, glabrous. Pedicel 2-4 mm, glabrous. Buds oval, ca. 3 mm, apex obtuse. Calyx ca. 2.5 mm, glabrous. Anthers oval. Lower part of ovary adnate to disk; style conical. Fl. May.
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