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It might be. But it was in a fairly dry habitat, and was quite luxuriant.
I find this on raised, dry stony path edges albeit with water on either side. Come to think of it. I've never found it growing in water!
Please see my Flickr photo's www.flickr.com/photos/129804972@N07/
Lat/Lng: 51.97119, -0.2737
OS grid ref: TL186317