Orchid cactus is a popular term used to describe a certain species of cactus that produces bright and colorful flowers. However, there are a few other synonyms used for this particular cactus plant. For instance, some people refer to it as the Epiphyllum cactus because it grows on the trees and rocks in its natural habitat. Additionally, some locations refer to it as the night-blooming cereus due to its unique blooming cycle. Finally, some also call it the queen of the night cactus, given its show-stopping blooms that last all night. Regardless of the term, orchid cacti are a popular houseplant due to their easy maintenance and stunning blooms.