Okay-- not entirely sure on this one. The Turk's Cap Cactus (also known as Compass Cactus because it tends to face South) does grow on the Virgin Islands.
I saw this guy walking on a gravel road near White Bay and Beach on Peter Island.
Melocactus azureus is a species of plant in the Cactaceae family. It is endemic to Brazil. Its natural habitats are rocky areas and hot deserts. It is threatened by habitat loss.