Epiphyllum oxypetalum (DC.) Haw. is a cactus native to Central America, from Mexico to Nicaragua. It has been introduced elsewhere in the tropics and subtropics, where it can sometimes naturalise. 

It is widespread and common and is assessed as Least Concern on the International Union for Conservation of Nature (IUCN) Red List.

Unusually for a cactus, it is an epiphyte with aerial roots, growing on rainforest trees and producing erect, climbing or sprawling stems with flattened, leaf-like cascading branches.

The species flowers at night, earning it the common names ‘queen of the night’ or ‘princess of the night’. Its spectacular star-shaped, funnelled white flowers are 20 - 30 cm long and are sweetly fragrant when open.

It is harvested from the wild and from cultivation for traditional medicine. Studies have found it to have anti-inflammatory, antioxidant, and antimicrobial properties. The leaf extracts are moisturising for the skin, and the mucilaginous flowers are used in vegetable soups.