Eutrochium maculatum

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

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][4]

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 also abundant in wetlands.[7][8]



  1. ^ a b "Eutrochium maculatum (L.) E.E.Lamont". The Global Compositae Checklist (GCC) – via The Plant List.
  2. ^ "Eutrochium maculatum". Germplasm Resources Information Network (GRIN). Agricultural Research Service (ARS), United States Department of Agriculture (USDA). Retrieved 14 January 2018.
  3. ^ Eutrochium maculatum, Natural Resources Canada
  4. ^ a b "Eutrochium maculatum". County-level distribution map from the North American Plant Atlas (NAPA). Biota of North America Program (BONAP). 2014.
  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. ^ "Eutrochium maculatum var. maculatum". New York Flora Association. 2005. Retrieved 2008-09-24.
  8. ^ a b Lamont, Eric E. (2006). "Eutrochium maculatum". In Flora of North America Editorial Committee. Flora of North America North of Mexico (FNA). 21. New York and Oxford – via, Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
Ottawa, Ontario