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Eupatorium
''Eupatorium'' is a genus of flowering plants in the aster family, Asteraceae, containing from 36 to 60 species depending on the classification system. Most are herbaceous perennial plants growing to 0.5–3 m tall. A few are shrubs. The genus is native to temperate regions of the Northern Hemisphere. Most are commonly called bonesets, thoroughworts or snakeroots. The genus is named for Mithridates Eupator, king of Pontus.
==Systematics and taxonomy==
''Eupatorium'' has at times been held to contain as many as 800 species,〔Whittemore (1987)〕 but many of these have been moved (at least by some authors) to other genera, including ''Ageratina'', ''Chromolaena'',
''Condylidium'', ''Conoclinium'', ''Critonia'', ''Cronquistianthus'', ''Eutrochium'', ''Fleischmannia'', ''Flyriella'', ''Hebeclinium'', ''Koanophyllon'', ''Mikania'', and ''Tamaulipa''.〔King, R. M. and H. Robinson. 1987. The genera of Eupatorieae (Asteraceae). Monographs in Systematic Botany, Missouri Botanical Garden 22: 1-581.〕
The classification of the tribe Eupatorieae, including species placed in ''Eupatorium'' in the present or past, is an area of ongoing research, so further changes are likely. What seems fairly certain by now is that there is a monophyletic group containing ''Eupatorium'' (about 42 species of white flowered plants in North America, Europe and Asia, but not South America) and the Joe-pye weeds (''Eutrochium''), and possibly others.〔Ito ''et al.'' (2000), Schmidt & Schilling (2006)〕
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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