Lianas, woody, slender. Branchlets terete, with slight longitudinal ridges, glabrous. Leaves simple; stipules caducous; petiole 2-4.5 cm, glabrous; leaf blade ovate-elliptic, 7.5-13 × 3.5-5.5 cm, glabrous, lateral veins 7 or 8 pairs, veinlets raised, base broadly cuneate, apex acuminate. Compound dichasium; peduncle 8-13.5 cm, glabrous. Pedicel 4-10 mm, glabrous. Buds oval, 2.5-3 mm, apex rounded. Calyx cupular, glabrous, teeth inconspicuous. Petals elliptic, glabrous, apex corniculate. Filaments flat; anthers yellow, oval. Disk well developed, 4-lobed. Pistil abortive in male flowers. Fl. May.
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