Lianas to 9 m, most parts yellowish tomentose. Stems hollow when dry. Petiole 4-5 cm; leaf blade broadly ovate to ovate-oblong, 20-30 × 11-14 cm, papery, glabrescent, base cordate, apex acute; lateral veins 11 or 12 pairs, anastomosing before margin. Inflorescences very congested, enclosed within bracts at least when young, 6-9 cm; rachis forked; peduncle as long as petiole; bracts and bracteoles leaflike, longer than flowers. Pedicel 1-1.7 cm. Sepals obovate-oblong, 1.5-1.7 cm × 5-10 mm, striate, pubescent; basal glands absent. Corolla yellowish, campanulate, hirsute outside, glabrous inside; tube ca. 5 mm; lobes broadly ovate, ca. 3.5 × 4 mm, apex incised, base auriculate, ciliate. Corona lobes ovate-oblong, obtuse. Pollinia oblong, ca. 6 mm. Follicles cylindric-ellipsoid, 12(-16) × 3.5(-9) cm. Seeds ovate; coma ca. 2 cm. Fl. Feb-May, fr. Aug-Dec.
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