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Arnica lanceolata
''Arnica lanceolata'' is a North American species of arnica in the sunflower family, known by the common name clasping arnica〔(Flora of North America, Clasping arnica, ''Arnica lanceolata'' )〕 or lanceleaf arnica. It has a disjunct (discontinuous) distribution in western North America and northeastern North America.〔(Biota of North America Program 2014 state-level distribution map )〕〔(Calflora taxon report, University of California, ''Arnica lanceolata'' Nutt. ssp. ''prima'' (Maguire) Strother & S.J. Wolf Clasping arnica )〕
''Arnica lanceolata'' is a perennial herb usually growing from a small rhizome and producing one or more hairy, glandular stems. The stems are lined with 5 to 10 pairs of oval-shaped, toothed leaves up to 12 centimeters long. The inflorescence is a cluster of several daisy-like flower heads with a center of brownish disc florets and a fringe of yellow ray florets 1 to 2 centimeters long. The fruit is a cylindrical achene covered in hairs and with a light brown pappus at one end.〔
;Subspecies〔〔
* ''Arnica lanceolata'' subsp. ''lanceolata'' - Quebec, New Brunswick, Maine, New Hampshire, Vermont, New York
* ''Arnica lanceolata'' subsp. ''prima'' (Maguire) Strother & S.J.Wolf - Alaska, Yukon, Northwest Territories, Alberta, British Columbia, Washington, Oregon, California, Idaho, Montana, Utah, Wyoming, Nevada
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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