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Hi jukkaduei,I don't think peppermint has yellow flowers.What shape were the flowers and were they held singly or in a bunch or a spike?cheersfermi
Try Impatiens capensis
Acmella oppositifolia
You may be able to find more information about this South American plant via one of its many synonyns : http://www.theplantlist.org/tpl1.1/record/gcc-134628