Kendall County (IL) Forest Preserve District
Late Boneset
(Lateflowering Thoroughwort)
Eupatorium serotinum [C-value
0]
Aster family (Asteraceae)
Blooms
mid-August -
mid-October
The native Late Boneset is common in our area. It prefers partial or full sun and moist loamy soil high in organic matter. Habitats include moist black soil prairies, moist meadows near streams, swamps and low-lying areas along roads. This perennial is 3-6' tall and unbranched. The opposite leaves are up to 7" long and 2½" across on petioles up to 1" long. They are lance-shaped, largely hairless and coarsely toothed with 5 veins that diverge from the base. The flat-topped inflorescence consists of numerous flowers, each with about 12 white florets. Each floret is about ¼" long, narrow and tubular.
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Late Boneset at Maramech Forest Preserve September 5, 2014
Late Boneset at Yorkville Riverside Park August 24, 2015
Late Boneset at Harris Forest Preserve August 20, 2013
Late Boneset foliage at Harris Forest Preserve August 20, 2013
Late Boneset at Shuh Shuh Gah Canoe Launch August 28, 2013
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