Herbs twining. Stems slender, to 2 m, pubescent along 1 side. Petiole to 2.5 cm, flattened; leaf blade ovate, 6.5-14 × 4-7.5 cm, membranous, glabrous, base truncate or shallow cordate, apex acute; lateral veins 5 or 6 pairs, flattened, anastomosing before margin. Inflorescences shorter than leaves, to 7 cm, branched, primary division unequally 3-fid, later branching lax and irregular; cymules 1- or 2-flowered; peduncle 2-2.5 cm. Pedicel 7-14 mm. Sepals ovate, ca. 1 × 0.5 mm, glabrous, without glands. Corolla yellowish white, rotate, to 1 cm in diam.; lobes oblong ca. 4 × 2.5 mm, glabrous outside, pubescent inside. Corona lobes ovate, pouched, apex acute, reaching base of anthers. Anthers nearly square, appendages rounded; pollinia oblong, subhorizontal. Ovaries glabrous. Stigma head discoid. Fl. Jun.

* Forests. E Guangxi.