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I have recently bought Collins Flower Guide and still finding my way around the keys etc. I was using Kebel Martin's book from the 70's This looks much easier to use. There a few mints on the reserve I think they are Water, Corn and this one I am going to take the book over and key them out looking carefully at the features and update.
Howardian Local Nature Reserve
Graeme (cicuta58) is probably right, but as he says, an exact ID of a mint is often difficult from a photograph. An alternative good possibility here (I think!) is a broad-leaved variant of M. spicata. Close examination needed!
Lat/Lng: 51.4, -3.2
OS grid ref: ST2078