Flowers of plants in the poppy family, papaveraceae, have two sepals, often withering early, and four petals, sometimes fused. At the centre are a large group of stamens (up to 60) and a compound pistil, of up to 100 carpels. Leaves are usually alternate, stalked and pinnately lobed. There are 20 species native to the British Isles, including those transferred from the fumariaceae family.