Kölnisch Wasser
Eau de Cologne mint, also known as orange mint and bergamot mint, is a cultivated mint. In a 1970 study, most plants were found to be male sterile forms of "Mentha aquatica", so were regarded as Mentha aquatica" var. "citrata, although in England the hybrid "Mentha" × "piperita" was found. The Royal Horticultural Society treats eau de Cologne mint as Mentha" × "piperita" f. "citrata. The World Checklist of Selected Plant Families sinks both scientific names into "Mentha aquatica".