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. Eupatorium has recently undergone some revision and has been broken up into smaller genera.