What is "orchid cactus"

n. any cactus of the genus Epiphyllum having flattened jointed irregularly branching stems and showy tubular flowers [syn: epiphyllum]

Orchid cactus is an English name for a plant which may refer to:

• Epiphyllum hybrid, one of a number of hybrid cacti formed by crosses between Disocactus, Pseudorhipsalis, Selenicereus and Epiphyllum; often collectively called "epiphyllums" or "epis"
• Epiphyllum, one or more of the species of this genus.
• Disocactus ×hybridus, a hybrid cactus often incorrectly called Disocactus ackermannii