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Spotted Joe Pye Weed, Purple Boneset, Spotted Trumpetweed - Eutrochium maculatum


Family: Asteraceae - Aster family Genus Common Name: Joe Pye Weed Native Status: NativeDicot Perennial Herb Subshrub
Eutrochium maculatum - Spotted Joe Pye Weed, Purple Boneset, Spotted Trumpetweed.
There are only five species in the Eutrochium genus, Joe Pye Weed. These were previously classified in the Eupatorium genus (Thoroughworts.) The separating characteristics are the whorled leaves and purple-tinted flowers of Eutrochium, versus mostly opposite leaves and white flowers in the plants remaining in Eupatorium. Eutrochium was named Eupatoriadelphus until it was determined that the Eutrochium name had seniority.

Spotted Joe Pye Weed (formerly Eupatorium maculatum) is the most widespread of the Eutrochium species, being found in 36 states (BONAP shows only 35.) (E. steelie is the least widespread, found only in 4 states.)

Found in:
AZ, CO, CT, GA, IA, ID, IL, IN, KS, KY, MA, MD, ME, MI, MN, MO, MT, NC, ND, NE, NH, NJ, NM, NY, OH, PA, RI, SD, TN, UT, VA, VT, WA, WI, WV, WY

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Eutrochium maculatum

Distribution of Eutrochium maculatum in the United States and Canada:
Map unavailable.
Map courtesy of The Biota of North America Program.
Map color key

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Site: Boundary Waters Canoe Area Wilderness, Lake County, MN Date: 2012-September-06Photographer: Gerald C. Williamson
Nikon D7000
The inflorescence of Spotted Joe Pye Weed is made of many - perhaps hundreds - of pink to purple disk flowers.
Eutrochium maculatum
Site: Boundary Waters Canoe Area Wilderness, Lake County, MN Date: 2012-September-06Photographer: Gerald C Williamson
Nikon D7000
Spotted Joe Pye Weed leaves are in whorls of 3 to 6, most frequently 4. The stem is usually purplish, with darker purple spots on it.
Click on the photo for a larger image
Eutrochium maculatum
Site: Boundary Waters Canoe Area Wilderness, Lake County, MN Date: 2012-September-06Photographer: Gerald C Williamson
Nikon D7000
Eutrochium maculatum grows to over 6 feet tall. It flowers from late summer through fall. The frequently grow in moist areas such as this streambank.
Click on the photo for a larger image
Eutrochium maculatum
References used for identification and information:
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Eutrochium maculatum initially published on USWildflowers.com 2012-09-19; Updated 2018-11-20

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All content except USDA Plants Database map Copyright Gerald C. Williamson 2024
Photographs Copyright owned by the named photographer



Code Update 20230302