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Melastomataceae family

Heterotis rotundifolia (Smith) Jacques-Félix, Adansonia 20(4): 417.  1981.
Bas.: Osbeckia rotundifolia Smith (1813). 

Naturalized quite rare herb of open very wet spots, particularly roadsides. Appearing in ravines. Becoming more common.
Native to tropical Africa.
Also a cultivated ornamental.