This is Redshank, Persicaria maculosa, growing at the back of a beautiful sandy cove just west of Newgale beach. It was just above the small storm beach of pebbles where a stream disappeared beneath.
This is the first member of the Dock family, Polygonaceae, which includes (besides the namesakes) Knotweeds, Bindweeds and Knotgrasses as well as Persicarias. It can be a tricky group due to small differences between species. This one is one of the easier ones as it often has a dark splodge on the leaves, just visible in this rather poor photo.
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