Perennial, stem stout 15-60 cm high, ascending, rarely documbent, with densely fibrous root-stock. Basal leaves long petioled, 7-12 cm wide, entirely or finely or coarsely toothed upper ones and sessile. Flowers yellow rarely white, 2.5-5 cm in diameter. Sepals 5-6, petaloid, ± obovate-oblong or lanceolate. Follicles variable in number with variable length of style. Seeds oblong, black, ± shining.