Lianas woody, to 8 m, glabrous except for inflorescences, latex white. Trunk to 8 cm in diam.; branches sparsely to densely lenticellate. Petiole 5-10 mm; leaf blade elliptic or obovate, 4-13 2.5-6 cm, papery; lateral veins 5-9 pairs, base cuneate or rarely rounded. Cymes 5-25-flowered, puberulent to glabrous; peduncle to 7.5 cm; bracts 2 or 3 pairs, linear, 4-15 mm, spreading or recurved, puberulent. Pedicel 4-10 mm. Sepals linear or nearly so, 0.6-1.8 cm, puberulent on both sides. Corolla pinkish; tube 1-1.5 cm, puberulent inside, glabrous outside; lobes ovate, abruptly narrowed to tail, 1.8-5.5 cm, tail ca. 1 mm wide, glabrous to sparsely puberulent inside; corona lobes triangular, 2.8-6.5 mm. Stamens puberulent; filaments 6-8.5 mm, connective linear, exserted, 8.5-12.5 mm. Ovary minutely puberulent. Style 6-8.5 mm. Follicles oblong, 11-25 2.5-3 cm, woody, densely lenticellate, divergent at 180°. Seeds 1-1.8 cm, beak 2.2-4.4 cm, coma 5.5-9 cm. Fl. Mar-Jun, fr. Jul-Dec. 2n = 22.

Mixed woods, brushwoods; 500-1500 m. S Yunnan [Bangladesh, India, Laos, Malaysia, Thailand, Vietnam].