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Arnica parryi
''Arnica parryi'' is a North American species of arnica known by the common name Parry's arnica or nodding arnica.〔(Calflora taxon report, University of California, ''Arnica parryi'', A. Gray, Parry's arnica, nodding arnica )〕 It is native to western Canada (Yukon, British Columbia, Alberta) and the western United States as far south as Inyo County, California and McKinley County, New Mexico. It grows in temperate coniferous forests and alpine meadows in mountainous areas, primarily the Rocky Mountains, Cascades, and Sierra Nevada.〔(Biota of North America Program 2014 county distribution map )〕
''Arnica parryi'' is a rhizomatous perennial herb producing a single unbranched stem to heights between 10 and 60 centimeters. There are oval-shaped leaves around the base of the stem and a few pairs of longer, narrower petioled leaves above them. The leaves may approach 20 centimeters in length on larger individuals.〔(Flora of North America Vol. 21 Page 373 Parry’s arnica, nodding arnica Arnica parryi A. Gray, Amer. Naturalist. 8: 213. 1874. )〕
The inflorescence holds one to several daisylike flower heads, which nod as buds and then pull erect when the face opens. Each head has a center filled with yellow disc florets and usually several yellow ray florets around the edge. The fruit is a cylindrical achene about half a centimeter long with a bristly pappus.〔
==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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