Annual, usually erect or somewhat spreading or straggling, hispid, 25-60 cm tall herb. Leaves 2-7 cm long 3-5-partite, central lobe longest, each lobe toothed to pinnately partite, lower leaves sometimes not lobed, nearly glabrous or sparsely stiff hairy, more so beneath; stipules 2-7 mm long, c. 1 mm broad, linear, stiff hairy, more so beneath; petiole 1.5-c. 4 cm long, minutely stellate pubescent and sparsely mixed with spreading stellate hairs. Flowers axillary, solitary; pedicel 2-4.5 cm long, stiff hairy, more so above, articulate near the top. Epicalyx segments 7-12, 5-15 cm long, linear, margin with long simple, spreading, very stiff hairs, tubercled at base. Calyx twice the length of epicalyx, fused above the middle, with green-purplish raised veins, stellate pubescent, spreading and stiff hairy on nerves, very much inflated and enclosing the fruit; lobes deltoid, acuminate, c. 1 cm broad, minutely stellate and long, simple appressed hairy within towards the margin. Corolla white-pale yellow with a purple mouth, 1.5-3 cm across; petals 1-2 cm long, 0.7-1.5 cm broad, glabrous. Staminal column 3-4 mm long, purplish; filaments c. 2 mm long, purplish; anthers yellow. Capsule 1-1.5 cm long, 0.6-1.2 cm broad, oblong, obtuse, black, very hispid. Seeds many, c. 2 mm long and broad, black tuberculate.