Erect herb, 0.5-1.5 m tall; roots usually tuberous. Branches, petioles and pedicels simple and stellate hairy, usually hispid or hirsute. Leaves 10-15 cm long and broad, orbicular or broadly ovate, cordate at base, simple or stellate usually hirsute, angular or 5-7 lobed, coarsely serrate to dentate; stipules 1-2 cm long, linear to filiform; petiole 1-18 cm long. Flowers axillary, usually solitary; pedicel c. 2 cm long, in fruit up to 3 cm. Epicalyx segments 10-16, 2.5-5 cm long, 0.5-1 mm broad, linear. Calyx 2-2.5 cm long. Corolla 6-7 cm across, yellow with a purple spot in the centre; petals 6-8 cm long, 4 cm broad, obovid. Staminal column c. 2 cm long. Capsule 3.5-5 cm long, 2.5-3.5 cm across, ovoid to globular, simple and stellate pubescent, hirsute. Seeds 3-3.5 mm across, globular or reniform, black, rusty tomentose or glabrous.