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 |
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