Sint Maarten-Myrtle (Calyptranthes boldinghii)  

The small, shrubby Sint Maarten-Myrtle was described in 1909, it is known only by the type material which was collected somewhere in the Dutch southern part of the island of Sint Maarten/St. Martin.

The species was not found again since, it is very likely extinct. 

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edited: 07.10.2020