Eutrochium
''Eutrochium'' is a North American genus of herbaceous flowering plants in the family Asteraceae. They are commonly referred to as Joe-Pye weeds. They are native to the United States and Canada, and have non-dissected foliage and pigmented flowers. The genus includes all the purple-flowering North American species of the genus ''Eupatorium'' as traditionally defined, and most are grown as ornamental plants, particularly in Europe and North America. Taxonomy ''Eupatorium'' has recently undergone some revision and has been broken up into smaller genera. (2000): Phylogeny and biogeography of ''Eupatorium'' (Asteraceae: Eupatorieae) based on nuclear ITS sequence data. ''American Journal of Botany, Am. J. Bot.'' 87(5): 716-726. PDF fulltext/ref> Joe Pye weeds were initially included in the genus ''Eupatorium'', but as early as the 19th century Franco-American botanist Constantine Samuel Rafinesque proposed separating them into their own genus ''Eutrochium''."Spotted Joe Pye weed (Eutr ...
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