Etymology: Eupatorium: from Greek name Mithridates Eupator, King of Pontus about 115BC who is said to have discovered an antidote to a commonly used poison in one of the species
Plants: erect, perennial, 2'-7' tall forb; stems spotted or evenly purplish
Leaves: sharply toothed, mostly in whorls of 4-5
Flowers: head with 9-22 pink to purple disk flowers; inflorescence a 7", usually flat-topped, branched cluster; blooms July-Sept.
Fruits: dry seed on fluffy pappus
Habitat: full sun; wet to moist; meadows, marshes, shores; in sandy, loamy, limy soil
Conservation Status: Native
Flora of North America: Flora of North America Floristic Rating: Coefficient of Conservatism = 4, Wetland Indicator = OBL Atlas of the Wisconsin Prairie and Savanna Flora: by T.S. Cochrane & H.H. Iltis: habitat, distribution infomation / flowering and fruiting times USDA Plants Database: Federal Distribution and detailed information including photos University of Wisconsin - Green Bay: Wetland Plants: Photos, descriptions, information USGS - Northern Prairie Wildlife Research Center: Wetland Plants and Plant Communities of Minnesota and Wisconsin Southwest School of Botanical Medicine: Britton & Brown Illustrated Flora - 2nd Edition (1913) "An Illustrated Flora of the Northern United States and Canada"