Lianas, woody. Branchlets terete, slender, with longitudinal ridges, glabrous. Leaves pedately 5-foliolate; petiole 1-6 cm; central petiolule 1.3-1.5 cm, petiolules of lateral leaflet complex 0.5-1.5 cm, lateral petiolules very short or lateral leaflets subsessile, glabrous; leaflets glabrous, lateral veins 5-7 pairs, veinlets inconspicuous; central leaflet lanceolate, 10-16 × 3-5 cm, base cuneate or rounded, apex acuminate; lateral leaflets 7-12 × 2-2.4 cm, base rounded or slightly cordate, margin undulately serrate, apex acuminate or mucronate. Inflorescence umbelliform, axillary; peduncle 1.5-2.5 cm, glabrous. Pedicel 1-1.2 mm, pilose. Buds oval, 1.8-2 mm, apex rounded. Calyx cupular, pilose, teeth fine, ca. 1/2 as long as petals. Petals oval, 1.6-1.8 mm, glabrous, apex galeate. Disk conspicuous, 4-lobed. Lower part of ovary adnate to disk; style short; stigma 4-lobed. Fl. Mar.
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