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a genus of dwarf shrubs of the family Cactaceae. The cylindrical, primarily woody stems gradually become flat and leaflike or, more rarely, three-angled shoots with a serrated or notched edge. The leaves are reduced to small scales. The white or cream-colored solitary nocturnal flowers are funnelform and have a long tube. There are about 20 species, found throughout South America, as well as in forests and along the coasts of Mexico. Many hybrids are cultivated in greenhouses; they are produced by crossing Epiphyllum with large-flowered cereuses, primarily of the genus Hylocereus.