Looking for help to identify a plant growing at and above the water's edge of a small river, below stinging nettles, which make a good comparison.
Leaves are dark green, very serrated, very pointed, narrow, very v-shaped in cross-section. Unable to get near to see if hairy etc.
I can't think of anything. It might be worth reporting it to the Canal and River Trust, it may be something not wanted, or they may be able to tell you what it is.
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