Chamerion angustifolium
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![Chamerion angustifolium thrives in areas cleared by fire.](/Images/godic/202501/11/Fireweed_Near_Roadside_Alaska0943.jpg")
![The capsule breaks open lengthwise to release seeds, each with a hairy plume.](/Images/godic/202501/11/Chamerion_angustifolium_263580944.jpg")
Chamerion angustifolium, commonly known as fireweed (mainly in North America), great willow-herb (some parts of Canada), and rosebay willow-herb or rosebay willowherb (mainly in Britain), is a perennial herbaceous plant in the willowherb family Onagraceae.