Epiphyllum ("upon the leaf" in Greek) is a genus of 19 species of epiphytic plants in the cactus family (Cactaceae), native to Central America. Common names for these species include orchid cacti and leaf cacti, though the latter also refers to the genus Pereskia.
The stems are broad and flat, 1-5 cm broad, 3-5 mm thick, usually with lobed edges. The flowers are large, 8-16 cm diameter, white to red, with numerous petals.
Epiphyllum species are added to some versions of the hallucinogenic drink Ayahuasca.
In Chinese, there is a saying "昙花一现" (tanhua yi xian) which means "to bloom briefly", alluding to the short lifespan of the flower, which only lasts one night.