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Fireweed

Chamerion angustifolium

''Chamerion angustifolium'', commonly known as fireweed , great willow-herb , or rosebay willowherb , is a perennial herbaceous plant in the willowherb family Onagraceae. It is native throughout the temperate Northern Hemisphere, including large parts of the boreal forests.

This species has been placed in the genus ''Chamerion'' rather than ''Epilobium'' based on several morphological distinctions: spiral leaf arrangement; absence of a hypanthium; subequal stamens ; zygomorphic stamens and stigma. Under this taxonomic arrangement, ''Chamerion'' and ''Epilobium'' are monophyletic sister genera.

Two subspecies are recognized as valid:
* ''Chamerion angustifolium'' ssp. ''angustifolium''
* ''Chamerion angustifolium'' ssp. ''circumvagum''

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