water mint
noun
a Eurasian mint plant, Mentha aquatica, of marshy places, having scented leaves and whorls of small flowers
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Examples from the Web for water mint
Historical Examples of water mint
The water-mint and scorpion-grasses remain far into November, and the former scents more sweetly as the season wanes.
A Cotswold VillageJ. Arthur Gibbs
Was that the dried sweetness of balsam,—the pungent odor of pennyroyal and water-mint,—the clean, resinous fragrance of the pines?
Hope MillsAmanda M. Douglas
Was it the damp that brought the perfumes of the moorland so distinctly toward them—the bog-myrtle, the water-mint and wild thyme?