Late-Flowering Thoroughwort, Late-Flowering Boneset - Eupatorium serotinum
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Eupatorium serotinum - Late-Flowering Thoroughwort, Late-Flowering Boneset. There 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
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Distribution of Eupatorium serotinum in the United States and Canada:
Map courtesy of The Biota of North America Program.
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| | Site: The Pocket at Pigeon Mountain, Walker County, GA Date: 2012-August-26 | Photographer: 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. | | 
| | Site: Watauga County, NC Date: 2013-August-23 | Photographer: 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
| | Site: Watauga County, NC Date: 2013-August-23 | Photographer: 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
| | Site: Watauga County, NC Date: 2013-August-23 | Photographer: 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
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References used for identification and information:
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