Vines, herbaceous. Branchlets terete, with longitudinal ridges, glabrous; tendrils trifurcate. Leaves pedately 5-foliolate; stipules caducous; petiole 3-5.5 cm; central petiolule 0.5-2 cm, lateral petiolules absent or short, petiolules of lateral leaflet complex 2-5 mm, sparsely pubescent; leaflets ovate-lanceolate, pilose on veins, lateral veins 6-9 pairs, veinlets conspicuously raised; central leaflet 6.5-9 × 1.8-3.2 cm, base rounded or broadly cuneate, apex acuminate; lateral leaflets 3-6.5 × 1.6-3 cm, base rounded, margin undulate with 12-19 fine teeth on each side, apex acuminate. Compound dichasium axillary; peduncle 0.8-2 cm, glabrous or slightly hairy. Pedicel 2-4 mm, sparsely pubescent. Buds oval, 1-2.5 mm, apex rounded. Calyx saucer-shaped, papillose, entire. Petals oval, 0.8-1.5 mm, papillose. Anthers oval. Lower part of ovary adnate to disk; stigma expanded. Fl. Jun.
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