Eutrochium is a North American genus of herbaceous flowering plants in the sunflower family. 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. Joe Pye Jopi in the Native tongue, an Indian healer from New England, used E. purpureum to treat a variety of ailments, which led to the name Joe-Pye weed for these plants.

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