Selenicereus, also known as moonlight cactus, is a genus of cacti that includes epiphytic, lithophytic, and terrestrial species. Found in Mexico, Central America, the Caribbean, and northern South America, Selenicereus species are known for their large, fragrant flowers that often bloom at night. These cacti grow in a variety of habitats, from trees and rocks to the ground, and are adapted to both tropical and subtropical environments. Selenicereus is prized for its dramatic, sometimes fragrant blooms and striking growth forms, making it a popular choice for ornamental gardening and indoor cultivation.