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BRIEF: Why is U. Dioica classified as a toxic plant?

I am puzzled why U. Dioica should be classified as a toxic plant. Please could you tell me the reasons why?


The American U. dioica var. gracilis stings like hell if you brush up against it, as do californica, holosericea, lyalli, serra, urens and piluifera. If there are non-stinging varieties of U. dioica in the UK, then I guess I understand the confusion.