The prairie ironweed (Vernonia fasciculata) belongs to Asteraceae (the Aster family). It is a perennila herb that is native from south-central Canada to the central and eastern United States. This herb grows in prairies, marshes, along railroads, and up to a height of 60-120 cm. The stem is erect and unbranched. The leaves are narrowly lanceolate, narrowly ovate, or linear, and arranged in alternate. Their margins are serrated. The magenta flower-heads bloom in the dense corymbs from July to September. The compound flower consists of 15-30 disk florets with green bracts underneath.