Eutrochium maculatum (L.) E.E. Lamont
Spotted Joe-pye Weed, Joe-pye Weed, Spotted Trumpetweed
Asteraceae (Aster Family)
Synonym(s): Eupatoriadelphus maculatus, Eupatorium maculatum, Eupatorium purpureum var. maculatum
USDA Symbol: EUMA9
2-6 feet tall unbranched native perennial plant bearing branched flower stalks at the top. Main stem is purple or purple-spotted, stout and round, often covered with fine white hairs. Whorls of 4 or 5 yellowish green leaves occur along the central stem Leaves up to 8 inches long and 2½ inches across, ovate to narrowly ovate with serrated margins and conspicuous veins. Pink or purple flowers occur in flat-headed clusters several inches across containing 8-20 disc florets and no ray florets. Fruit achene-like with hair-like bristles dispersed by the wind.
The Joe-Pye Weeds have been assigned to the genus Eupatoriadelphus to separate them from the Bonesets (Eupatorium). Some sources still refer to this species as Eupatorium. The genus Eupatoriadelphus differs from the genus Eupatorium by whorled leaves, while Eupatorium has opposite leaves.
From the Image Gallery
Plant CharacteristicsDuration: Perennial
Root Type: Fibrous
Leaf Arrangement: Whorled
Leaf Complexity: Simple
Leaf Shape: Ovate
Leaf Margin: Serrate
Size Notes: To about 6 feet in height.
Fruit: Fruit is a cypsela (pl. cypselae). Though technically incorrect, the fruit is often referred to as an achene.
Bloom InformationBloom Color: Pink , Purple
Bloom Time: Aug , Sep , Oct
DistributionUSA: 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
Canada: AB , BC , MB , NB , NL , NS , ON , PE , QC , SK
Growing ConditionsLight Requirement: Sun , Part Shade
Soil Moisture: Moist , Wet
BenefitUse Wildlife: Not a preferred food source for herbivores, but may be eaten occasionally by deer, rabbits and livestock.
Conspicuous Flowers: yes
Fragrant Flowers: yes
Interesting Foliage: yes
Larval Host: The caterpillars of some moth species feed on various parts.
Nectar Source: yes
National Wetland Indicator Status
BibliographyBibref 946 - Gardening with Prairie Plants: How to Create Beautiful Native Landscapes (2002) Wasowski, Sally
Search More Titles in Bibliography
Web ReferenceWebref 38 - Flora of North America (2019) Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
Additional resourcesUSDA: Find Eutrochium maculatum in USDA Plants
FNA: Find Eutrochium maculatum in the Flora of North America (if available)
Google: Search Google for Eutrochium maculatum
MetadataRecord Modified: 2022-12-27
Research By: Joseph A. Marcus