Wildflowers of the United States

Home Journal Family Index - All States Photo Albums News About Privacy

Late-Flowering Thoroughwort, Late-Flowering Boneset - Eupatorium serotinum


Family: Asteraceae Aster family Genus Common Name: Thoroughwort Native Status: Native
Eupatorium serotinum - Late-Flowering Thoroughwort, Late-Flowering Boneset. here are 24 Eupatorium species in North America; over 40 worldwide, with Thoroughworts being found in Europe and Asia. It used to be a larger genus, with Eutrochium (Joe Pye Weed) being included in Eupatorium until fairly recently. Eupatorium serotinum is one of the most widely distributed species in the genus, surpassed only by Eupatorium altissumum (Tall Thoroughwort) and Eupatorium perfoliatum (Common Boneset.) One or more of these species frequently line the backroads of the eastern half of the United States with their white blossoms in late summer and early fall.

Found in:
AL, AR, CT, DC, DE, FL, GA, IA, IL, IN, KS, KY, LA, MA, MD, MI, MN, MO, MS, NC, NE, NJ, NY, OH, OK, PA, RI, SC, TN, TX, VA, WI, WV

Distribution of Eupatorium serotinum in the United States and Canada:
USDA Plants Distribution Map temporarily unavailable.
Blue=Native; Grey=Introduced

Map from USDA Plants Database:
USDA, NRCS. 2009. The PLANTS Database (http://plants.usda.gov, 30 Oct 2014). National Plant Data Center, Baton Rouge, LA 70874-4490 USA.

Search Our Database of Species
Enter any portion of the Scientific
or Common Name (or both)

Scientific name:
Common name:

Example: Enter "lob" in the common name field and you'll get all our species that have "lobelia" in the common name, as well as "sharp-lobed hepatica".

Do a general Google search of the entire site:




Follow on Twitter
Follow USWildflowers on Twitter




Site: The Pocket at Pigeon Mountain, Walker County, GA Date: 2012-August-26Photographer: Gerald C. Williamson
Nikon D7000
Tamron SP 90MM f/2.8 AF Macro
Eupatorium serotinum is in the Eupatorieae tribe of Asteraceae; one of the characteristics of Eupatorieae are that they have no ray flowers. Late-Flowering Boneset normally has 9 to 15 white disk flowers, although I have seen plants with up to 20. The styles usually branch near the base and extend well beyond the 5 corolla lobes, giving the inflorescence a feathery appearance. Similar Eupatorium altissimum and Eupatorium perfoliatum usually have fewer florets.
Eupatorium serotinum

Site: Watauga County, NC Date: 2013-August-23Photographer: Gerald C Williamson
Nikon D7000
The inflorescence of Eupatorium serotinum is a flat topped corymb - the flowers open starting with the outermost flowers in the cluster. The plant can grow up to six feet tall.
Click on the photo for a larger image
Eupatorium serotinum

Site: Watauga County, NC Date: 2013-August-23Photographer: Gerald C Williamson
Nikon D7000
The leaf of Eupatorium serotinum is lanceolate to ovate and serrate. The veins are palmate from a strong central vein. It may be sparsely hairy. The leaf of Eupatorium altissimum is narrower, pubescent, and had three distinct veins starting at the leaf base.
Click on the photo for a larger image
Eupatorium serotinum

Site: Watauga County, NC Date: 2013-August-23Photographer: Gerald C Williamson
Nikon D7000
The leaves of Eupatorium serotinum are opposite and on petioles, frequently long petioles. The petioles of Eupatorium altissimum (Tall Boneset) are much shorter, or the leaf may be sessile. Eupatorium perfoliatum has leaves which are connate-perfoliate - they are sessile and the opposite leaves join at the base around the stem. Eupatorium resinosum has sessile or nearly sessile leaves.
Click on the photo for a larger image
Eupatorium serotinum

References used for identification and information:

Looking for Wildflowers for a specific state? Check here:



All content except USDA Plants Database map Copyright Gerald C. Williamson 2014
Photographs Copyrighted by the named photographer