Myrcianthes fragrans, commonly known as twinberry or Simpson's stopper, is a tree in the family of Myrtaceae, native to Florida, the United States Virgin Islands, other countries within the Caribbean, central America and northern South America. It is a common tree in moist tropical forests of the region.
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It requires little maintenance; drought tolerant; has very few insect or disease problems.
Simpson's stopper is a threatened plant species and is listed on the Florida Department of Agriculture and Consumer Services' threatened list.
Source: http://gardeningsolutions.ifas.ufl.edu/plants/trees-and-shrubs/shrubs/simpsons-stopper.html