Spotted Joe-Pye Weed

Spotted Joe-Pye Weed, Eupatoriadelphus maculatus, sometimes called spotted trumpetweed, is a hardy and fast-growing long-stemmed perennial in the aster family, indigenous to the eastern U.S. from the Great Plains to New England. In Illinois, it's found mainly in the northern half of the state. It is more shade-tolerant and moisture-loving than its cousin, Sweet Joe-Pye Weed.
 
For more about Spotted Joe-Pye Weed and native plants for the Midwest, especially those that do well in shade/moist areas, see the "book" on this website, Gardening with Native Plants in Shady Evanston.