Some botanists consider Hairy Mint just a sub-variety of Water Mint. There's not even any agreement on its scientific name.
There are also native American plants referred to as Hairy Mints: Hairy Wood Mint (Blephilia hirsuta) and Hairy Mountain Mint (Pycnanthemum pilosum.)
For the classic "Hairy Mint", see Water Mint.
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Whorled Mint; Mentha aquatica x arvensis, Mentha sativa, Mentha villosa, Mentha x verticillata L., Mentha X villosa Huds (Scientific Name); Quirl-Minze (German)