Lianas to 4 m. Branches pubescent along 2 lines, glabrescent. Petiole 3-8 cm; leaf blade oblong to ovate, 4-15 × 1.5-10 cm, papery, glabrous, base cordate or shallowly so, apex acute; basal veins 5, lateral veins 3 or 4 pairs. Inflorescences extra-axillary; peduncle (0.5-)1.5-2 cm; rachis simple, producing a spiral succession of umbel-like cymules, eventually racemelike. Pedicel 1.5-2 cm. Sepals broadly lanceolate, puberulent, ciliate. Corolla yellowish, rotate; lobes ovate, ca. 3.5 × 2.5 mm, puberulent, minutely tomentose inside. Corona lobes stellate spreading, lanceolate, ca. 2 mm, with a thick appendage on ventral surface. Follicles oblong-lanceolate, 15-17 cm × 7-10 mm, glabrous. Seeds ovate-oblong, ca. 1.5 cm × 5 mm, margin membranous; coma ca. 1.3 cm. Fl. Jun-Aug, fr. Aug-Oct.
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