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Ageratina occidentalis
''Ageratina occidentalis'' is a species of flowering plant in the daisy family known by the common name western snakeroot or western eupatorium.〔(Flora of North America Vol. 21 Page 552 Western snakeroot, ''Ageratina occidentalis'' (Hooker) R. M. King & H. Robinson, Phytologia. 19: 224. 1970. )〕 It is native to the western United States where it grows in several types of habitat. It is found in California, Oregon, Washington, Idaho, Montana, Nevada, and Utah.〔(Biota of North America Program 2014 county distribution map )〕
''Ageratina occidentalis'' is a rhizomatous perennial herb growing fuzzy green or purple stems to a maximum height near 70 centimeters. The glandular leaves are triangular with serrated edges. The inflorescence is a dense cluster of fuzzy flower heads containing long, protruding disc florets in shades of white, pink, and blue. There are no ray florets. The fruit is an achene a few millimeters long with a rough, bristly pappus.〔(Jepson Manual Treatment )〕
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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