Tuber annual, spherical (fide Perdue & Kibuwa). Plant glabrous. Twining stems, up to 3 m. long. Leaves alternate; petiole up to 8 cm. long; blade heart-shaped, rather gradually narrowed to an acute acumen, up to 14(–18) cm. long and broad, often much smaller. Aerial tubers irregularly subglobose, up to 5 cm. in diameter, deep purplish. Inflorescences pendulous.