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Arnica sororia
''Arnica sororia'' is a North American species of arnica known by the common name twin arnica.〔(Calflora taxon report, University of California, ''Arnica sororia'' E. Greene, twin arnica )〕 It is native to western Canada (British Columbia, Alberta, Saskatchewan) and the western United States (Washington, Oregon, California, Nevada, Utah, Idaho, Montana, Wyoming, South Dakota).〔(Biota of North America Program 2014 county distribution map )〕 It grows in grasslands and in conifer forests.〔(Flora of North America Vol. 21 Page 370 Twin arnica ''Arnica sororia'' Greene )〕
''Arnica sororia'' is a rhizomatous perennial herb producing one or more hairy, glandular stems 10 to 50 centimeters tall. There are several pairs of broadly lance-shaped leaves along the stem, the lower ones borne on petioles. Leaves may reach up to 14 centimeters long.〔(Greene, Edward Lee 1910. Ottawa Naturalist 23(12): 213 )〕
The inflorescence holds one to five daisy-like flower heads lined with phyllaries coated in glandular hairs. The flower head has a center of glandular yellow disc florets and a fringe of yellow ray florets. The fruit is an achene a few millimeters long with a white 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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