Lianas, woody. Branchlets terete, with longitudinal ridges, glabrous or with sparse, white woolly hairs; tendrils bifurcate. Leaves simple; petiole ca. 15 cm, with sparse, brown arachnoid tomentum or glabrescent; leaflets broadly ovate, ca. 23 × 24 cm, abaxially pilose, veins with sparse, brown arachnoid tomentum, adaxially pubescent, basal veins 5, lateral veins 4 or 5 pairs, veinlets slightly prominent abaxially, inconspicuous adaxially, base cordate, margin with fine teeth, apex rounded and obtuse. Compound dichasium leaf-opposed, base cirrose and bifurcate; peduncle ca. 6 cm, with sparse arachnoid tomentum. Pedicel 1-1.5 mm, with sparse glandular hairs. Buds elliptic, 2-2.5 mm, apex rounded. Calyx saucer-shaped, nearly glabrous, undulately lobed. Petals ovate-oblong, 1.5-1.8 mm, glabrous. Stamen 5; anthers oval. Disk obvious, lobed. Lower part of ovary adnate to disk; style short, ca. 10-ridged. Fl. Jul.
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