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Northern Prairie Wildlife Research Center

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Aquatic and Wetland Vascular Plants of the Northern Great Plains

Eupatorium L.

Stout, erect perennials from a thick rootstock; leaves simple, opposite and connate-perfoliate or whorled and short-petiolate, serrate. Heads discoid, usually numerous and clustered in a terminal corymbiform inflorescence; involucral bracts in 2-4 series, imbricate or weakly so, green or colored like the corollas; receptacle flat to conic, naked; disk florets perfect, their corollas pinkish-purple to purple or white; style branches terete, elongate, papillose. Achenes 5-angled, glandular; pappus of numerous capillary bristles.

Lead Characteristic Go To
1 Leaves whorled, short-petiolate. E. maculatum
1 Leaves opposite, connate-perfoliate. E. perfoliatum

49. Asteraceae, the Aster Family
9. Eupatorium L.
1. Eupatorium maculatum L. -- Joe-Pye weed
2. Eupatorium perfoliatum L. -- Boneset

Return to Family -- Asteraceae - The Aster Family
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