Chamaenerion angustifolium

Chamaenerion angustifolium is a perennial herbaceous flowering plant in the willowherb family, Onagraceae. It is known in North America as fireweed and in Britain and Ireland as rosebay willowherb. It is also known by the synonyms Chamerion angustifolium and Epilobium angustifolium. It is native throughout the temperate Northern Hemisphere, including large parts of the boreal forests.