Vines, herbaceous. Branchlets terete, with longitudinal ridges, glabrous; tendrils bifurcate. Leaves pedately 5-foliolate; stipules caducous; petiole 2-4.5 cm; petiolules short or leaflets nearly sessile, petiolules of lateral leaflet complex 0.4-1.5 cm, glabrous; leaflets glabrous, lateral veins 5-7 pairs, veinlets inconspicuous; central leaflet elliptic-lanceolate, 3.5-9 × 1.5-3 cm, base cuneate, margin with 5 or 6 teeth on each side, apex acuminate; lateral leaflets ovate-elliptic, 2-5 × 1.5-2.5 cm, base cuneate or rounded, apex acute or obtuse. Compound dichasium axillary; peduncle 3-3.5 cm, glabrous. Pedicel 1.5-2.5 mm, glabrous. Buds oval or ovoid-elliptic, 2-3 mm. Calyx cupular, glabrous, entire or triangular lobed. Petals triangular-oval, 1.5-2.5 mm, with sparse papillose hairs, corniculate at apex. Anthers oval, nearly as long as wide. Lower part of ovary adnate to disk; style short, slightly enlarged at base. Berry globose, 8-10 mm in diam., 2-4-seeded. Seeds obovoid-elliptic, base rostrate, apex retuse, raphe raised, ventral holes groovelike or obovate-elliptic in shape upward nearly 1/3. Fl. Apr-May, fr. Jul-Sep.
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