Lianas to 12 m. Branchlets pale yellow or gray, pubescent when young, glabrescent, lenticellate. Petiole 1-3 cm; leaf blade narrowly obovate, 7-25 X 3-11 cm, base cuneate, apex acuminate to cuspidate, glabrous or sometimes pubescent along veins or when young. Cymes 13.5-21.5 cm, 3-6-flowered, puberulent; peduncle to 4 cm. Pedicel to 6 cm. Sepals pale yellow, broadly elliptic or obovate, 3.5-5.5 X 2-3.2 cm, puberulent on both surfaces. Corolla white, ca. 12 cm in diam.; tube 6-8.5 cm, puberulent, cylindric proximally, broadly obconical distally; lobes 4-5.5 X 3.5-5 cm, acute. Stamens exserted; filaments 5.5-6 cm; disc cup-shaped, apex sparsely puberulent. Ovary tomentose. Style 5.5-7 cm, glabrous. Follicles oblong, to 16 4 cm. Seeds brown, oblong, ca. 1.5 cm, coma to 4 cm. Fl. spring-summer.
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