Eupatorium maculatum L. - Spotted Joe Pye Weed


 

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Eupatorium maculatum - (image 1 of 7)

 

Taxonomy

Family: Asteraceae

Habitat

Common in marshes. Also characteristic of calcareous fens.

Associates

In fens it grows with Angelica atropurpurea, Caltha palustris, Campanula aparinoides, Cirsium muticum, Pedicularis lanceolata, Sambucus canadensis, Solidago patula, Symplocarpus foetidus.

Distribution

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Morphology

Herbaceous perennial. Principle stem leaves whorled, 4 to 5 per whorl. Stem purple or purple-spotted, not glaucous. Heads mostly more than 8-flowered. Inflorescences usually flattish.

Notes

Flowers mid June to early October

Wetland indicator: Obligate

This species can form large stands in mucky wetlands that have been heavily grazed (Swink 341). It is fairly common on the open banks of streams that run through fens. A good plant for naturalizing in moist areas.

Bibliography

Swink, F. and G. Wilhelm. 1994. Plants of the Chicago Region.
Indiana Academy of Science. The Morton Arboretum. Lisle, Illinois.

 


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 Michael Hough 2004