Nettle

now that looks like a very heavy leafed white nettle variant-if boiled when fresh an excellent anti scorbutic (scurvy) , the European peasantry awaited fresh growths of these in spring to bring relief from a diet bereft of vitamin c (not that they knew that , they just had scabby skin and felt lousy-ah well , thats the Dark Ages for you!).

There is a much smaller, "fuzzy" leafed version, which looks very similar and that stuff is NASTY. It will leave stings that burn for hours...at the slightest touch. I learned about that just before learning about jewel weed