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''Chamerion angustifolium'', commonly known as fireweed (mainly in North America), great willow-herb (some parts of Canada),〔ROM Field Guide to Wildflowers of Ontario, Royal Ontario Museum, Toronto:McClelland and Stewart Ltd., 2004.〕 or rosebay willowherb (mainly in Britain), 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'' (sometimes, incorrectly, given as ''Chamaenerion'') rather than ''Epilobium'' based on several morphological distinctions: spiral (rather than opposite or whorled) leaf arrangement; absence (rather than presence) of a hypanthium; subequal stamens (rather than stamens in two unequal whorls); zygomorphic (rather than actinomorphic) stamens and stigma. Under this taxonomic arrangement, ''Chamerion'' and ''Epilobium'' are monophyletic sister genera.〔W. L. Wagner, P. C. Hoch, and P. H. Raven, 2007. ''Revised classification of the Onagraceae.'' Systematic Botany Monographs 83: 1-243.〕 Two subspecies are recognized as valid: * ''Chamerion angustifolium'' ssp. ''angustifolium'' * ''Chamerion angustifolium'' ssp. ''circumvagum'' ==Etymology== The species name ''angustifolium'' ('narrowleaved') is constructed from the Latin words ''angustus'' meaning 'narrow' and ''folium'' meaning 'leaved' or 'leaf'. It shares this name with other species of plant including ''Vaccinium angustifolium''. The common British name, from the passing resemblance of the flowers to roses and the leaves to those of bay, goes back in print to Gerard's Herball of 1597.〔Oxford English Dictionary〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Chamerion angustifolium」の詳細全文を読む スポンサード リンク
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