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CommentsThis is one of many wildflowers in the Aster family that produces showy yellow flowerheads during the summer and fall. Like other species in its genus, the flowerheads of Bitterweed have very distinctive petal-like rays with broad 3-toothed tips. Bitterweed is also distinguished by its very narrow leaves (less than 1/8" across) that are nearly filiform; they often occur in short clusters along the stems. Other Helenium spp. in Illinois have wider leaves and they prefer habitats that are more damp.