Lianas to 6 m. Branches lenticellate; branchlets pubescent. Petiole 1.5-4 cm, densely pubescent; leaf blade 8-13 × 5-8 cm, pubescent, more densely so abaxially, base rounded, apex acute; lateral veins 6 or 7 pairs. Cymes often paired at nodes, umbel-like, with condensed branched rachis, pubescent, many flowered; peduncle 1-1.5 cm. Pedicel 3-8 mm. Sepals ovate, puberulent. Corolla yellowish, campanulate, glabrous outside; tube with 5 prominent longitudinal ridges with lines of hairs along each side; lobes ovate, ca. 1.2 × 1.2 mm, densely pubescent adaxially, shorter than corolla tube. Gynostegium cylindric; membranous anther appendages shorter than stigma head; pollinia oblong. Stigma head conical, apex 2-cleft. Follicles lanceolate in outline, beaked, 4.5-5.5 × 1.5-2 cm, densely pubescent. Seeds oblong-ovate, ca. 1.1 cm × 5 mm, margin membranous; coma ca. 3 cm. Fl. Apr-Nov, fr. Aug-Dec.
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