The large, funnel shaped, white flowers are up to 11 inches long and up to 5 inches wide. This fragrant, nocturnal bloom opens in the late evening and closes again at sunrise. The flowers are followed by small, up to 4 inches long, oblong, purplish-red, angled fruits. 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 its flowers wilt before dawn.