Midewin National Tallgrass Prairie
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  • Marsh Boneset

    SCIENTIFIC NAME: Eupatorium perfoliatum

    COMMON NAMES: Marsh Boneset, Boneset, American Boneset, Thoroughwort, Common Thoroughwort, Common Boneset

    BLOOM TIME: July, Aug, Sep


    • 2 ¼ ft. tall, unbranched, side stems are covered in long white hairs
    • Flower heads are clusters spanning 2-8 in. & are quite fragrant. 
    • Each head has 15 disk florets.
    • Spread by rhizomes forming colonies.
    • Habitat: sun & wet conditions, not aquatic but tolerates flooding.
    • Fairly common in Illinois in blacksoil prairies and various wetlands.