Aquatic and Wetland Vascular Plants of the Northern Great Plains
49. Asteraceae, the Aster Family
9. Eupatorium L.2. Eupatorium perfoliatum L. -- Boneset
Stems 3-12 dm tall, villous, especially above. Leaves opposite, broad-based and mostly connate-perfoliate, lanceolate, 6-15(20) cm long, 1.5-5 cm wide, sparingly pubescent to nearly glabrous above, more densely pubescent beneath, punctate with yellowish glands on both surfaces, acuminate, finely crenate-serrate and scabrous on the margins. Inflorescence flat-topped; involucres 3-5 mm high, the bracts green with white margins, glandular, weakly imbricate, acute to acuminate; corollas white. Achenes blackish, glandular-spotted, 1.5-2 mm long. Late Jul--Sep. Marshes, wet meadows, shores and swampy places; occasional in se ND, e SD and across NE; (N.S. and Que. to se Man., s to FL and TX).
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