Vines, herbaceous. Branchlets terete, with longitudinal ridges, villous with brown segmented hairs 1-1.5 mm; tendrils bifurcate. Leaves pedately 5-foliolate; stipules brownish, lanceolate, 3-3.5 × ca. 1 mm, membranous, nearly glabrous; petiole 2.5-7 cm; central petiolule 1.5-3 cm, lateral petiolules short, petiolules of lateral leaflet complex 0.5-1.5 cm, with dense, long, soft brown segmented hairs; leaflets abaxially with dense segmented hairs, hairs appressed on midvein, adaxially pilose with appressed hairs or nearly glabrous, lateral veins 4-9 pairs, veinlets inconspicuous; central leaflet elliptic-lanceolate or elliptic, 4.5-10 × 2.5-5 cm, base cuneate, margin (5-)7-14(-17)-toothed on each side, apex caudate-acuminate; lateral leaflets ovate-elliptic or oval, 3.5-7 × 1.3-3.5 cm, base cuneate or nearly rounded, margin 5-10-toothed on each side, apex acute or acuminate. Compound dichasium axillary; peduncle 1-4.5 cm, with dense, long, brown, segmented hairs. Pedicel 1.5-2 mm, villous with segmented hairs. Buds oval, 1.5-2 mm, apex rounded. Calyx shallow and saucer-shaped, with brown segmented hairs, teeth inconspicuous. Petals oval, 1-1.5 mm, with segmented hairs. Anthers oval. Disk well developed, 4-lobed. Lower part of ovary adnate to disk; style fine; stigma slightly expanded. Berry globose, 8-10 mm in diam., 2-4-seeded. Seeds obovoid-elliptic, base rostrate, apex rounded or retuse, ventral holes broadly obovate-elliptic, nearly to apex. Fl. May-Jul, fr. Aug-Sep.
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