Distribution
Like all true cacti, the genus originates in the Americas, but the precise native origin of the species "S. undatus" is uncertain and never been resolved; it may be a hybrid.
Habitat
"Selenicereus undatus" is lithophytic or hemiepiphytic. It is widely distributed through the tropics in cultivation. It is a sprawling or vining, terrestrial or epiphytic cactus. They climb by use of aerial roots and can reach a height of 10 meters or more growing on rocks and trees.References:
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