Parthenium integrifolium, commonly called American feverfew, is a clump-forming, Missouri native perennial which occurs in dry soils on prairies, glades and rocky woods. Grows 3-4' tall. Parthenium integrifolium is a tall robust plant that is quite conspicuous when in full flower. The numerous small heads form a distinctive flat-topped floral structure with densely crowded whitish wooly flowers.
