Roots tuberous, 10-50 × 1-4 cm. Stems twining to 5 m, puberulent. Leaves opposite; petiole ca. 5 cm, with adaxial glands; leaf blade broadly ovate to ovate-oblong, 4->18 × 4-11.5(-17) cm, membranous, adaxially puberulent, base cordate, basal lobes mostly recurved, sometimes incurved, rarely overlapping, apex short acuminate; lateral veins 5 or 6 pairs. Inflorescences racemelike, to 30-flowered; peduncle 6-10 cm. Pedicel ca. 1.5 cm, puberulent. Sepals ovate-oblong, ciliate, pubescent. Corolla white, to 1 cm; tube short; lobes oblong, (3-)3.5-6 × 1.5-1.7 mm, strongly reflexed after anthesis, pilose inside. Corona very deeply 5-lobed; lobes elliptic, fleshy, obtuse, up to 2 × as high as gynostegium, with narrowly triangular adaxial appendages; pollinia oblong. Stigma head conical, apex 2-cleft. Follicles lanceolate in outline, 8-11 cm × 8-10 mm, with 2 longitudinal ridges. Seeds ovate-elliptic. Fl. Jun-Sep, fr. Jul-Dec.
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