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Eutrochium maculatum
Species of flowering plant in the family Asteraceae From Wikipedia, the free encyclopedia
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Eutrochium maculatum, the spotted joe-pyeweed,[2] is a North American species of flowering plant in the family Asteraceae. It is widespread through much of the United States and Canada.[3] It is the only species of the genus Eutrochium found west of the Great Plains.[4]
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This herbaceous perennial sometimes grows as high as 2 m (6 ft 7 in). Stems are sometimes completely purple, sometimes green with purple spots. One plant can produce numerous rose-purple flower heads in late summer, each head with 8-22 disc flowers but no ray flowers.[5] The specific name maculatum, meaning spotted, refers to the purple spots on the stem.[6][4]
Spotted joe-pyeweed thrives in marshes, rich fens and swamps. It also does well in man-made moist expanses such as ditches, seepage areas and wet fields. Above all else the plant flourishes in the non-shaded environments that are also abundant in wetlands.[7][8]
It is a larval host to the Clymene moth, the eupatorium borer moth, the ruby tiger moth, and the three-lined flower moth.[9] The plant also attracts butterflies and honeybees.[10][11]
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Varieties
The following varieties are known:[1][8]
- Eutrochium maculatum var. bruneri (A. Gray) E. E. Lamont - western Canada (British Columbia to Saskatchewan), western USA (Minnesota west to Idaho, south to Arizona + New Mexico)
- Eutrochium maculatum var. foliosum (Fernald) E. E. Lamont - eastern Canada (Newfoundland to Ontario), northern USA (Maine to Minnesota)
- Eutrochium maculatum var. maculatum - eastern Canada (Newfoundland to Ontario), eastern USA (Maine to Minnesota, south to northern Georgia)
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Cultivars
The following cultivars are recipients of the Royal Horticultural Society's Award of Garden Merit (listed under the synonym Eupatorium maculatum):-
- (Atropurpureum Group) 'Orchard Dene' [12]
- (Atropurpureum Group) 'Purple Bush' [13]
- (Atropurpureum Group) 'Riesenschirm' [14]

References
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