Lianas, woody. Branchlets terete, with longitudinal ridges, glabrous. Leaves pedately 7-foliolate; petiole ca. 10 cm; central petiolule ca. 4 cm, petiolules of lateral leaflet complex 1-2.5 cm, lateral petiolules 0.5-2 cm, sparsely pilose; leaflets only abaxially with sparse appressed hairs on veins, lateral veins 4-9 pairs, veinlets not raised abaxially, inconspicuous adaxially; central leaflet obovate-elliptic, ca. 12 × 5.5 cm, base rounded, margin 14-or 15-toothed on each side, apex mucronate; lateral leaflets elliptic, 5-11 × 3-5.5 cm, base subrounded or slightly cordate, margin 5-13-toothed, apex mucronate. Compound dichasium axillary, ca. 5 cm; peduncle 2-3 cm, sparsely pubescent, with nodes and bracts. Pedicel 1-2 mm, papillose. Buds elliptic, 1.5-2 mm, apex rounded. Calyx saucer-shaped, with sparse papillose hairs or glabrescent, nearly entire. Petals elliptic, 1-1.5 mm, apex rounded, glabrous. Anthers yellow, oval. Disk conspicuously 4-divided in male flowers. Ovary poorly developed in male flowers. Fl. Jul.
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