Eutrochium maculatum (Spotted Joe-pye Weed)
|Also known as:||Purple Boneset, Spotted Trumpetweed|
|Habitat:||sun; moist soil, along shores|
|Bloom season:||July - September|
|Plant height:||2 to 10 feet|
|Wetland Indicator Status:||GP: OBL MW: OBL NCNE: OBL|
|MN county distribution (click map to enlarge):|
|National distribution (click map to enlarge):|
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Flat clusters 3 to 5 inches across made up of dozens to hundreds of pink to purplish flower heads. A head is made up of 8 to 20 petal-less disk flowers, each with 2 long stringy styles and 5 tiny lobes. The bracts are usually purplish and in 2 layers, the outer ones often hairy.
A very similar species is Sweet Joe Pye Weed (Eutrochium purpureum), which does not have spotted stems, but does typically have deep purple tinging at the leaf nodes and flower stalk nodes. Both are related to Boneset. Spotted Joe Pye weed is listed in many field guides as Eupatoriadelphus maculatus or Eupatorium maculatum, but the accepted name in Minnesota is Eutrochium maculatum. There are 3 varieties of E. maculatum in Minnesota. Var. bruneri is the most densely hairy and about as common as var. maculatum, which is more typically hairless on the lower stem. Var. foliosum, only known to be in Cook County, is much like var. maculatum except the leaves whorled at the base of a flower cluster are up to 8 inches long, spreading out wider than the flower cluster, where those of var. maculatum are only about 1 inch long.
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Photos by K. Chayka taken at Long Lake Regional Park, Ramsey County. Photos courtesy Peter M. Dziuk taken in Anoka and Aitkin counties.
Have you seen this plant in Minnesota, or have any other comments about it?