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Arnica viscosa
''Arnica viscosa'' is an uncommon North American species of arnica in the sunflower family, known by the common name Mount Shasta arnica (not to be confused with the Shasta County arnica, A. venosa).〔(Flora of North America Vol. 21 Page 377 Mt. Shasta arnica ''Arnica viscosa'' A. Gray )〕
It is native to the Klamath Mountains and nearby southern Cascade Range in northern California (Shasta, Siskiyou and Trinity Counties) and southern Oregon (Josephine, Douglas, Klamath, and Deschutes Counties).〔(Biota of North America Program 2014 county distribution map )〕〔(Calflora taxon report, University of California, Mt. Shasta arnica )〕 It grows in subalpine to alpine habitats.〔
==Description==
''Arnica viscosa'' is a perennial herb usually producing one or more hairy, glandular stems 20 to 50 centimeters tall. There are five to ten pairs of oblong leaves along the stem each a few centimeters long.〔〔(Gray, Asa 1878. Proceedings of the American Academy of Arts and Sciences 13: 374 )〕
The inflorescence bears many flower heads lined with hairy, glandular phyllaries. The head is discoid, containing only yellow disc florets, and no ray florets.〔〔
The fruit is an achene about 5 or 6 millimeters long, not counting its white to brownish pappus.〔〔
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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