What is Fireweed/Great Willow Herb? (Environmental Toxin- Flowers, Shrubs & Trees)

(Epilobium angustifolium) Chamaenerion is a genus of flowering plants in the family Onagraceae. It has sometimes been included in the genus Epilobium. Members of the genus may be called willowherbs, or fireweeds, based on a common name used for C. angustifolium.