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Eupatorium sessilifolium
''Eupatorium sessilifolium'', commonly called upland boneset or sessile-leaved boneset, is a North American plant species in the sunflower family. It is native to the eastern and central United States, found from Maine south to North Carolina and Alabama, and west as far as Arkansas, Kansas, and Minnesota.〔(Biota of North America Program 2014 county distribution map )〕
==Description==
''Eupatorium sessilifolium'' is a perennial herb with stems somteimes more than 100 centimeters (40 inches) tall. They are produced from a woody underground caudice or short rhizome. The top of the stems, where the branching begins to the flower heads, have short hairs, while the lower part of the stems have no hairs. The leaves are arranged in opposite pairs and are toothed. The leaf bases are rounded and the leaves are sessile (lacking stalks), but they do not clasp around the stem. The foliage is dotted with glands. ''Eupatorium sessilifolium'' blooms in August and September (July in the southern part of its range), and the small inflorescences are branched and composed of widely spaced, tiny white flower heads in corymbiform (flat topped) arrays. The heads typically have five or six disc florets per head, but no ray florets.〔http://wisplants.uwsp.edu/scripts/Detail.asp?spcode=EUPSESvBRI〕〔(【引用サイトリンク】 Eupatorium )〕
Upland boneset is a threatened species in Michigan, and legally protected in that state.〔http://web4.msue.msu.edu/mnfi/explorer/species.cfm?id=13517〕
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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