is a specific kind of: caryophylloid dicot family.

has as a member: cactus | Acanthocereus, genus Acanthocereus | Aporocactus, genus Aporocactus | Ariocarpus, genus Ariocarpus | Carnegiea, genus Carnegiea | Cereus, genus Cereus | genus Coryphantha | genus Echinocactus | Echinocereus, genus Echinocereus | genus Epiphyllum | Ferocactus, genus Ferocactus | genus Gymnocalycium, Gymnocalycium | genus Harrisia, Harrisia | genus Hatiora, Hatiora | genus Hylocereus, Hylocereus | genus Lemaireocereus, Lemaireocereus | genus Lophophora, Lophophora | genus Mammillaria | genus Melocactus, Melocactus | genus Myrtillocactus, Myrtillocactus | genus Pediocactus, Pediocactus | genus Nopalea, Nopalea | genus Opuntia, Opuntia | genus Peireskia, genus Pereskia, Peireskia, Pereskia | genus Rhipsalis, Rhipsalis | genus Schlumbergera, Schlumbergera | genus Selenicereus, Selenicereus | genus Zygocactus, Zygocactus ... show more.

is a member of: Opuntiales, order Opuntiales.