Lianas, woody. Stems gray, slightly flat; branchlets terete, with longitudinal ridges, glabrous; tendrils unbranched. Leaves 3-foliolate; petiole 4-7 cm; central petiolule 1.5-3 cm, lateral petiolules 0.5-1.5 cm, glabrous; leaflets glabrous, lateral veins 5 or 6 pairs, veinlets distinct, raised abaxially; central leaflet elliptic-ovate or obovate-elliptic, 5.5-12 × 3.5-7 cm, base subrounded, margin with 4-6 fine teeth on each side, or teeth inconspicuous and subentire, apex mucronate; lateral leaflets ovate-elliptic or broadly oval, 6-9.5 × 3-5.5 cm, base asymmetric and subrounded, margin with 3-5 fine teeth on each side or subentire, apex acute. Compound dichasium glomerate, axillary, pseudoterminal or leaf-opposed, only axillary inflorescences with nodes and bracts; male inflorescence short, 1.5-2 cm; female inflorescence loose, ca. 6 cm; peduncle of male inflorescence 5-10 mm, that of female inflorescence ca. 3 cm, pubescent. Pedicels of male inflorescence very short or flowers nearly sessile; pedicels of female inflorescence 3-4 mm, pubescent. Buds oval, 1.5-2.5 mm, apex rounded. Calyx shallow and saucer-shaped, pubescent, margin undulate. Petals ovate-elliptic, apex subrounded, densely papillose. Filaments short; anthers yellow. Disk distinct, 4-lobed, inconspicuous in female flowers. Ovary coniform; style short and distinct; stigma 4-lobed. Berry elliptic, 1-1.2 cm in diam., 1-or 2-seeded. Seeds elliptic, base short, apex rounded, ventral holes furrowed nearly to apex. Fl. May-Jun, fr. Aug.
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