Florida is.. Sea grapes | Coccoloba uvifera (see http://nativeflags.org/sea-grape/)
Coccoloba uvifera is a species of flowering plant in the buckwheat family, Polygonaceae, that is native to coastal beaches throughout tropical America and the Caribbean, including southern Florida, the Bahamas, the Greater and Lesser Antilles, and Bermuda. Common names include seagrape and baygrape.
In late summer, it bears green fruit, about 2 cm (0.79 in) diameter, in large, grape-like clusters. The fruit gradually ripens to a purplish color. Each contains a large pit that constitutes most of the volume of the fruit.