On a similar note, the most commonly seen one in the Dominican Republic is in fact the one called the cochineal cactus. At one one time it was though to be a separate genus, Nopalea, but is now considered a true prickly pear. They are easy to ID to species if in flower, because the hot-pink flowers never open.
It is so commonly cultivated, but also so easily resprouts from discarded pads, it is difficult to tell which ones are wild and which cultivated.