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Which cactus genus may be native to East Africa, Madagascar, and Sri Lanka?
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Caryophyllales
Pink carnation flowers (Dianthus caryophyllus).
The cactus genus that may be native to East Africa, Madagascar, and Sri Lanka is Rhipsalis.
While the vast majority of the Cactaceae family is native to the Americas, Rhipsalis—specifically the species known as the mistletoe cactus (Rhipsalis baccifera)—is the only representative of the family that is possibly native to the Old World. Because this genus is also found in the Americas, its presence in Africa, Madagascar, and Sri Lanka has long been a subject of scientific debate. It remains uncertain whether these plants are truly native to these regions or if they were introduced by human activity in historic times.123