Branchlets terete, with longitudinal ridges, densely rubiginous lanate; tendrils bifurcate. Leaves palmate, 3-5-foliolate; stipules brownish, elliptic, 1.8-2.5 × 1-1.3 mm, membranous, glabrous or subglabrate, entire, apex acute; petiole 3-5 cm, with dense brown and arachnoid tomentum; leaflets abaxially with dense brown arachnoid tomentum, adaxially with sparse arachnoid tomentum when young, then glabrate, only midvein pilose with very short hairs, lateral veins 3-5 pairs, veinlets inconspicuous; central leaflet lanceolate, rarely oblong or obovate-lanceolate, 3.5-9 × 1.5-2.5 cm, base truncate, margin with 5 or 6 sharp teeth on each side, apex acuminate; lateral leaflets ovate-lanceolate, 3-8 × 1.2-3 cm, base asymmetric, obliquely cuneate or rounded, margin finely 6-11-toothed, apex acuminate. Panicle leaf-opposed, loose, basal branches well developed; peduncle 4-8 cm, with dense rubiginous arachnoid tomentum. Pedicel 1-1.3 mm, subglabrate. Buds obovoid, 1.7-2.8 mm, apex rounded. Calyx teeth inconspicuous. Ovary oval; style short. Berry globose, 8-10 mm in diam. Seeds obovoid, apex subrounded, chalazal knot elliptic, raphe raised.