Eutrochium maculatum

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Spotted joe-pyeweed
Flower Buds.JPG
Portage, Michigan
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Asterids
Order: Asterales
Family: Asteraceae
Genus: Eutrochium
Species: E. maculatum
Binomial name
Eutrochium maculatum
(L.) E.E.Lamont

Eutrochium maculatum (spotted joe-pyeweed[2]) is a North American species of flowering plants in the sunflower family. It is widespread through much of the United States and Canada.[3] It is the only species of the genus found west of the Great Plains.[4]

Eutrochium maculatum is an herbaceous perennial sometimes growing 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 binomial name maculatum, meaning spotted, refers to the purple spots on the stem.[6][7]

Spotted Joe-Pye weed 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 so abundant in wetlands.[8][9]



  1. ^ a b The Plant List, Eutrochium maculatum (L.) E.E.Lamont
  2. ^ "USDA GRIN Taxonomy". 
  3. ^ Eutrochium maculatum, Natural Resources Canada
  4. ^ Biota of North America Program 2014 county distribution map
  5. ^ RHS A-Z encyclopedia of garden plants. United Kingdom: Dorling Kindersley. 2008. p. 1136. ISBN 1405332964. 
  6. ^ Dickinson, T.; Metsger, D.; Bull, J.; & Dickinson, R. (2004) ROM Field Guide to Wildflowers of Ontario. Toronto:Royal Ontario Museum, p. 164.
  7. ^ Biota of North America Program 2014 county distribution map
  8. ^ "Eutrochium maculatum var. maculatum". New York Flora Association. 2005. Retrieved 2008-09-24. 
  9. ^ a b Flora of North America, Eutrochium maculatum (Linnaeus) E. E. Lamont, 2004. Spotted joepyeweed, eupatoire maculée
Ottawa, Ontario