<Ul> <Li> Cereus </Li> <Li> Echinopsis (usually Echinopsis pachanoi, San Pedro cactus) </Li> <Li> Epiphyllum (usually Epiphyllum oxypetalum, gooseneck cactus; grown as an indoor houseplant throughout the world, and the most popular cultivated night - blooming cereus) </Li> <Li> Harrisia </Li> <Li> Hylocereus (of which Hylocereus undatus is the most frequently cultivated outdoors, and is the main source of the commercial fruit crop, dragonfruit) </Li> <Li> Monvillea </Li> <Li> Nyctocereus (usually Nyctocereus serpentinus) </Li> <Li> Peniocereus (Peniocereus greggii, the best known, is strictly a desert plant which grows from an underground tuber and is infrequently cultivated) </Li> <Li> Selenicereus (usually Selenicereus grandiflorus) </Li> <Li> Trichocereus </Li> </Ul> <Li> Echinopsis (usually Echinopsis pachanoi, San Pedro cactus) </Li> <Li> Epiphyllum (usually Epiphyllum oxypetalum, gooseneck cactus; grown as an indoor houseplant throughout the world, and the most popular cultivated night - blooming cereus) </Li> <Li> Hylocereus (of which Hylocereus undatus is the most frequently cultivated outdoors, and is the main source of the commercial fruit crop, dragonfruit) </Li>

How often does a night blooming cereus bloom