A glabrous perennial twiner or liane; stems smooth, from a large subterranean tuber, robust, terete and finely striate. Leaf-blade orbicular in outline, 6–16 cm. long and broad, palmately divided to near the base; lobes 7, oblong-lanceolate or oblanceolate, up to 8 cm. long and 3.3 cm. wide, acuminate at the apex, narrowed below, entire; petiole 6–18 cm. long. Peduncle axillary, few- to several-flowered, 4–15 cm. long; pedicels 1.5– 1.8 cm. long, enlarging in fruit to 5 cm. Outer sepals ovate, obtuse, mucronate, 2.3–3 cm. long, 1.2–1.8 cm. wide; inner narrower, oblong, 2.1–2.5 cm. long; all sepals enlarging in fruit and becoming about 5–6 cm. long. Corolla yellow, funnel-shaped with a more or less cylindrical tube, 4.0–5.5 cm. long, 5–6 cm. wide, glabrous. Capsule ellipsoid to globose, enclosed in the sepals, about 3.5 cm. in diameter, splitting irregularly and also separating about the base. Seeds black, pubescent, about 1.7 cm. long.