Epiphyllum

About

Epiphyllum, ; from Ancient Greek ἐπι- (epi-), meaning "upon", and φύλλον (phúllon), meaning "leaf", is a genus of epiphytic plants in the cactus family (Cactaceae), native to Central America and South America. Common names for these species include climbing cacti, orchid cacti and leaf cacti, though the latter also refers to the genus Pereskia.

Summary from Wikipedia