Lianas, woody. Branchlets terete, with conspicuous longitudinal ridges, with dense, white or brown arachnoid tomentum and purple bristles; tendrils trifurcate. Leaves simple; stipules caducous; petiole 10-13 cm, with arachnoid tomentum and purple bristles; leaflets broadly ovate, 18-22.5 × 15.5-18 cm, abaxially with arachnoid tomentum, basal veins 5-7 with brown arachnoid tomentum, lateral veins 4-6 pairs, veinlets prominent abaxially, inconspicuous adaxially, base deeply cordate, margin with sharp teeth, apex acute or mucronate. Panicle leaf-opposed, loose, with brown arachnoid tomentum. Pedicel 1.8-2 mm, glabrous. Buds ovoid-elliptic, ca. 2 mm, apex rounded and obtuse. Calyx saucer-shaped, glabrous, undulately lobed. Petals elliptic, ca. 2 mm, glabrous. Stamen 5; anthers oval. Disk conspicuous, as 5, free, flat glands. Ovary conical; style longer than ovary; stigma conspicuous, expanded, 5-lobed.
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