The Papaveraceae are herbs or rarely shrubs or trees comprising 40 genera and 770 species that often have milky or colored sap. The leaves are simple to much divided or dissected, alternate or rarely subopposite, lacking stipules. The flowers are actinomorphic with several or only 2 planes of symmetry to zygomorphic, showy, and bisexual. The calyx consists of 2 or 3 distinct or rarely completely connate sepals that are usually torn off the receptacle as the bud opens. The corolla comprises 4-12 distinct petals in 1 or 2 whorls. The petals are often crumpled in bud. Stamens 6 and diadelphous or frequently distinct and numerous. The gynoecium consists of a single compound pistil with a superior ovary and usually many parietal ovules in a single locule. The two to many carpels equal the number of placentae. The fruit is generally capsular, commonly dehiscing by way of valves or pores or sometimes transversely.
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