I know this sounds far fetched, but could it possibly be the result of seed carried by typhoon (we call them hurricanes) from one of the more southern islands, then deposited on this mountain?
Months after hurricane Andrew devastated Miami, several different Carribean native plants began sprouting around the region. These are plants normally not found in Florida because they will not survive the occasional freeze during winter, and were carried by Andrew from islands further southeast by hundreds of miles.