Lianas, woody. Branchlets terete, slender, with longitudinal ridges, glabrous; tendrils unbranched. Leaves 3-foliolate; petiole 3.5-7 cm; central petiolule 1-2.5 cm, lateral petiolules short, 0.5-1.5 cm, glabrous; leaflets elliptic, ovate-elliptic, or obovate-elliptic, 6-13 × 3-6 cm, glabrous, lateral veins 6 or 7 pairs, veinlets inconspicuous, base broadly cuneate, base of lateral leaflets asymmetric, sometimes subrounded, margin with 5-11 dentate teeth on each side, apex mucronate or acuminate. Inflorescence umbelliform, axillary, 2.5-9.5 cm, with nodes and bracts; peduncle 1-2.5 cm, pubescent. Pedicel 1.5-4 mm, pubescent. Buds oval, 1.5-2 mm. Calyx saucer-shaped, papillose, margin undulate. Petals oval, 1.3-1.8 mm, apex corniculate, papillose. Filaments short; anthers yellow, oval. Disk obvious, 4-lobed. Lower part of ovary adnate to disk; style conspicuous; stigma 4-divided. Berry globose, ca. 8 mm in diam., 2-seeded. Seeds oval, base obtuse, apex rounded, surface smooth, ventral holes inconspicuous. Fl. Mar, fr. Aug.
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