Lianas woody, to 20 m. Branchlets obscurely len-ticellate, tawny pubescent. Petiole 1.5-5 cm; leaf blade broadly ovate or suborbicular, 12-33 X 7-20 cm, abaxially pubescent, base broadly cuneate to rounded, apex rounded or acute; lateral veins 9-12 pairs, subparallel, ascending. Cymes paniculate, terminal, to 15-flowered; bracteoles lanceolate, apex acute, ca. 1 mm. Calyx ca. 1.1 cm, eventually divided to base; lobes valvate, narrowly ovate, 8-12 X 3-4.5 mm, puberulent outside. Corolla reddish; tube cylindric, ca. 7 cm, dilated at middle, distal half densely pubescent inside; lobes obovate to obtriangular, 3.5-4 X 3.5-4.3 cm. Stamens inserted at middle of corolla tube; filaments densely pubescent; disc ringlike, shallowly divided at apex, shorter than ovary. Ovary glabrous; style puberulent at apex. Follicles cylindric, glabrous, ca. 34 X 1.2 cm. Fl. spring-summer.