large widely distributed genus of herbs and subshrubs of especially western North America and Arctic areas

Epilobium is a genus of about 160-200 species of flowering plants in the family Onagraceae, native to temperate and subarctic regions of both hemispheres. Most species are known by the common name Willowherb; other names for individual species include Fireweed, Zauschneria, California-fuchsia, Spike-primrose, Hummingbird Flower, and Hummingbird Trumpet.