Lianas, woody. Branchlets dark brown, terete, slender, with longitudinal ridges, glabrous; tendrils bifurcate. Leaves 3-foliolate; stipules caducous; petiole 2-3 cm; central petiolule 0.7-2 cm, lateral petiolules short, 3-9 mm, sparsely pilose; leaflets sparsely hispidulous with appressed fine hairs, abaxially sparsely villous on midvein, lateral veins 6-8 pairs, veinlets inconspicuous; central leaflet lanceolate, 6-14 × 1.5-3 cm, base cuneate, rarely subrounded, apex long acuminate; lateral leaflets ovate-lanceolate, 4.5-9.5 × 1.5-2.5 cm, base asymmetric and subrounded, margin with sparse sharp teeth, apex long acuminate. Corymbose polychasium axillary; peduncle 2-8 cm, with nodes and brownish bracts, pubescent. Pedicel 0.5-1 mm, densely pubescent. Buds elliptic, 1-1.5 mm, apex rounded. Calyx saucer-shaped, pubescent, teeth inconspicuous. Petals ovate-elliptic, 0.8-1.3 mm, glabrous. Anthers oval. Lower part of ovary adnate to disk; style slender. Berry 8-10 mm in diam., 2-or 3-seeded. Seeds globose to semiglobose, base rostrate, apex rounded, surface smooth, upper raphe raised, ventral holes rounded, ca. 2 mm in diam., ribs along margin slightly raised. Fl. Apr-May, fr. Jun-Jul.
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