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Oxalidaceae family

Oxalis debilis Kunth var. corymbosa (de Candolle) Lourteig, Ann. Missouri Bot. Gard. 67(4): 840.  1981.
Bas.: Oxalis corymbosa de Candolle (1824).

Naturalized quite rare herb of open and semi-open very wet spots.
Native to central and southern South America.