An erect, branched annual, more or less thickly beset with aculeate tubercles. Leaves on very long stalks, deeply palmately 5–7-lobed; lobes oblong-lanceolate, sinuous, denticulate, or sometimes more deeply divided, smooth on both surfaces or with a few prickly hairs, 1-glandulose on the under surface. Peduncles axillary, short, thick. Epicalyx of 5–7, linear, slightly coherent segments, shorter than the calyx, whose 5 lobes are lanceolate, acuminate, 1-glandulose, their margins and midribs fringed with coarse purplish bristles. Corolla yellow, with a purple centre, three or four times larger than the calyx. Capsule ovoid, pointed, villose, half the length of the calyx. Seeds numerous, slightly pilose.
