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Eutrochium maculatum
spotted Joe-pye weed
WTU images
WTU specimens
Other herbaria

Distribution: Known only from Whatcom County in Washington; Southern British Columbia to Washington, east across the Rocky Mountains and Great Plains to the Atlantic Coast.

Habitat: Swamps and other moist, open places, from sea level to the high plains.

Flowers: July-September

Origin: Native

Conservation Status: Historical in Washington (WANHP)


Stout, fibrous-rooted perennial, 6-20 dm. tall.


: Leaves whorled, mostly in 3u00e2u20acu2122s or 4u00e2u20acu2122s, lance-elliptic to lance-ovate, narrowed to the petiole, 6-20 cm. long and 2-7 cm. wide, sharply serrate, densely covered beneath with short, spreading, curly hairs.


Heads clustered in a rather flat-topped inflorescence; involucre 6.5-9 mm. high, often purplish; flowers purple, all with tubular corollas, 9-22 in each head; pappus of numerous capillary bristles.


Achenes 5-angled, glandular.

Accepted Name:
Eutrochium maculatum (L.) E.E. Lamont
Publication: Sida. 21: 902. 2004.

Synonyms & Misapplications:
Eupatoriadelphus maculatus (L.) R.M. King & H. Rob.
Eupatorium maculatum L. [HC]
var. bruneri – joe-pye weed, joepyeweed
Additional Resources:

PNW Herbaria: Specimen records of Eutrochium maculatum in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Eutrochium maculatum checklist entry.

E-Flora BC: Eutrochium maculatum atlas page.

CalPhotos: Eutrochium maculatum photos.

USDA Plants: Eutrochium maculatum information.

2 photographs:
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