Eupatorium perfoliatum L.
Family: Asteraceae
boneset, common boneset, thoroughwort
Eupatorium perfoliatum image
Asa Thoresen  
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, 3'-4' tall forb; stems with long spreading hairs
Leaves: opposite, sharply toothed, pointed tip and a wide base surrounding the stem leaf drawing
Flowers: head with 9-23 white disk flowers; inflorescence 6" flat to roundish, branched clusters; blooms July-Oct.
Fruits: dry seed on fluffy pappus
Habitat: full sun; wet to moderate moisture; meadows, prairies, shores; in sandy, loamy soil
Conservation Status: Native