Sepals 1.5–2.5 cm. long, ± ovate.
Inflorescence up to 40 cm. long, corymbose, several- to many-flowered, up to 2 per leaf-axil; pedicels 1.5–2.5 cm. long, becoming longer and clavate in fruit, up to 5 cm. long.
Corolla yellow or white, funnel-shaped, 4.5–6 cm. long.
Leaves peltate; blade ovate-orbicular, orbicular or oblate, 7–30 cm. long and broad, ± rounded at the base, acuminate or cuspidate at the apex, glabrous or slightly hairy below; inflorescence-leaves sometimes cordate instead of peltate; petiole 3–20 cm. long.
Stems glabrous, or hirsute near the nodes, arising from a large tuber.