Epiphyllum oxypetalum (Dutchman's pipe cactus or queen of the night) is a species of cactus and one of the most cultivated species in the genus. E. oxypetalum blooms rarely and only at night and the flower wilts before dawn. Though it is sometimes referred to as a nightblooming cereus, it is not closely related to any of the species in the tribe Cereeae, such as Selenicereus, that are more commonly known as nightblooming cereus. All Cereus bloom at night and are terrestrial plants; all Epiphyllum are epiphytic.