Root tubers 3-7 × 1.5-4 cm. Stems twining, to 4 m, slender, puberulent. Leaves opposite; petiole 1-1.5 cm; leaf blade hastate or narrowly ovate-triangular, 3-8 × 1-5 cm, membranous, hispid, base cordate, basal lobes rounded, recurved, apex acuminate; lateral veins 4-6 pairs. Inflorescences umbel-like, to 4 × 2.5 cm; peduncle 1.5-2.5 cm. Pedicel ca. 1 cm. Sepals lanceolate, ca. 1.5 × 0.7 mm, glabrous; basal glands present, few. Corolla white or yellowish green, rotate; tube ca. 1 mm; lobes oblong, ca. 4 × 2.5 mm, acute, strongly reflexed, minutely puberulent adaxially near center, otherwise glabrous. Corona deeply 5-lobed; lobes lanceolate, ca. 3.5 mm, longer than gynostegium, with slender, ligulate, adaxial appendage incumbent on anther. Anther appendages ovate; pollinia oblong. Follicles lanceolate in outline, 9-10 × ca. 1 cm, with 2 inconspicuous longitudinal ridges, glabrous. Seeds ovate, ca. 1 × 0.5 cm; coma ca. 4 cm. Fl. Jun-Jul, fr. Jul-Nov.
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A climbing herb. It keeps growing from year to year. It has stout tuberous roots. These are 5-15 cm long by 2-4 cm wide. The leave are opposite and sword shaped. They are 3-8 cm long by 1-5 cm wide. They are hairy. The flowers are white. They are in groups in the axils of leaves. The fruit are follicles that are sword shaped and 9 cm long by 1 cm wide. The seeds are oval and 1 cm long by 5 mm wide.
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