Eupatorium purpureum L. - Purple Joe Pye Weed


 

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Eupatorium purpureum - (image 1 of 5)

 

Taxonomy

Family: Asteraceae

Habitat

Woodlands.

Associates

In woodlands with Acer saccharum, Asarum canadense, Carya cordiformis, Fraxinus americana, Impatiens capensis, Laportea canadensis, Parthenocissus quinquefolia, Phlox divaricata, Prunus serotina, Quercus alba, Quercus rubra, Rhus radicans, Sanguinaria canadensis, Tilia americana, Ulmus americana, Ulmus rubra, Viola pubescens.

Distribution

.

Morphology

Herbaceous perennial to 6' high. Principle stem leaves whorled, rarely more than 4 per whorl, broadly elliptic to ovate, sharply serrate. Stems glaucous, to 2m high, pithy throughout of with slender center cavity, less than 6mm in diameter 1cm below the principle bracteal whorl. Flowers pale pink-purple. Heads fewer than 8-flowered. Inflorescences hemispherical or convex.

Notes

Flowers early July to early September

Wetland indicator: Upland

Prospers in woods that have been burned. Also called sweet joe-pye-weed because it emits a sweet odor when crushed.

References

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