biennual or perennial branched herbs, prickly or sometimes glabrous with yellow
juice. Leaves sessile, pinnate, lobes repand-dentate, teeth apically spiny.
Flowers solitary, terminal or axillary, yellow, orange or white. Sepals 2-3,
with horned appendices, caducous. Petals 6, in two whorls, contorted or
imbricate, caducous. Stamens indefinite, free, filaments filiform, anthers
linear, bifid. Ovary ovate-oblong, 1-celled, with many ovules, placentation
parietal, stigmas sessile, very short, radiating, 4-7 lobed. Capsules spiny,
4-6 ribbed, dehiscing along the sutures. Seeds many, pitted.