Aquatic and Wetland Vascular Plants of the Northern Great Plains
49. Asteraceae, the Aster Family
9. Eupatorium L.1. Eupatorium maculatum L. -- Joe-Pye weed
Stems 4-15 dm tall, short-pubescent above, densely so on branches of the inflorescence. Leaves in whorls of 3-6, lanceolate to ovate-lanceolate, 6-20 cm long, 2-6 cm wide, sparingly puberulent above, densely soft-puberulent beneath, acuminate, serrate, cuneate to nearly rounded at the base; petioles 0.5-2 cm long. Inflorescence or parts of it usually flat-topped; involucres 5-9 mm high, the bracts pinkish-purple or seldom white, imbricate, obtuse; corollas light pink to purple, seldom white. Achenes blackish, glandular-spotted, 2.5-4 mm long. Late Jul--Sep. Wet meadows, marshes, shores, stream banks, ditches, springs and swampy or boggy places, where water is fresh; frequent in e and c ND, e and w SD and across NE; (Newf. to B.C., s to MD, OH, IL, NM and UT).
Plants of this region belong to var. bruneri (A. Gray) Breitung.
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