is a biological genus in the family Cactaceae (Cacti) and order Caryophyllales.
Peniocereus striatus
Peniocereus greggii
Harrisia
Echinocactus
Ferocactus
Coryphantha
Epiphyllum
Sclerocactus
Escobaria
Mammillaria
Echinocereus
Pediocactus
Ariocarpus
Selenicereus
Hylocereus
Epithelantha
Opuntia
Carnegiea
Bergerocactus
Cereus
Turbinicarpus
Pilosocereus
Acanthocereus