Lianas, woody. Branchlets terete, with longitudinal ridges, glabrous; tendrils unbranched. Leaves 3-foliolate; stipules oval, ca. 3 × 4 mm, glabrous, apex acute; petiole 2.5-5 cm; petiolules 0.6-1.3 cm, central petiolule longer than lateral ones, glabrous; leaflets elliptic or elliptic-lanceolate, 5-9 × 2-4 cm, glabrous, lateral veins 7 or 8 pairs, veinlets inconspicuous, base rounded, margin with 4-8 teeth on each side, apex acuminate or mucronate. Inflorescence umbelliform, leaf-opposed; peduncle ca. 1.5 cm, sparsely pubescent. Pedicel 2-2.5 mm, glabrous. Buds elliptic, 1.8-2 mm, sparsely papillose, apex rounded. Calyx cupular, pubescent, teeth inconspicuous. Petals galeate at apex, sparsely papillose. Filaments short; anthers oval. Disk thin. Lower part of ovary adnate to disk in female flowers; style inconspicuous; stigma 4-lobed. Fl. Apr.
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