Herb or undershrub, erect 0.5-3 m tall. Stem simple and retrorse hairy, hispid to prickly. Leaves 6-30 cm long and broad, orbicular or broadly ovate, cordate at base, not or 3-7 lobed or parted, hispid on both sides; lobes deltoid to oblong-lanceolate, serrate to dentate or crenate or rarely entire; stipules linear or filiform, 6-12 mm long, simple hairy; petiole 2-30 cm long, hispid. Flowers axillary, solitary, pedicel 2-8 cm long, in fruit up to 19 cm. Epicalyx segments 6-10, 8-20 (-25) mm long, 1-2.5 (--5) mm broad, appressed, linear to lanceolate. Calyx 2-3.5 cm long. Corolla 10 cm across, yellow with a deep purple spot at the base; petals (3-) 7-9 cm long, 2-5.5 cm broad, ciliate at base. Staminal tube 1.5-2 cm long. Capsule 5-8 cm long, 2-3.5 cm across, ovoid to fusiform, densely simple hairy, usually hispid. Seeds 3-4 mm across, ovoid-reniform, usually glabrous or rarely stellate pubescent, black.