Kendall County (IL) Forest Preserve District
Tall Boneset
(Tall Thoroughwor)
Eupatorium altissimum [C-value
0]
Aster family (Asteraceae)
Blooms
mid-August -
September
The native Tall Boneset is common in our area. It prefers full or partial sun and slightly moist to dry conditions. Habitats include slightly moist to slightly dry black soil prairies, savannas and areas along roads. This perennial is 3-4' tall and unbranched with a stem covered with white hairs. The opposite leaves are up to 5" long and 1" across, occasionally with small teeth along the margins and three conspicuous veins that run along the length of each leaf. The rather flat inflorescence consists of numerous heads of small white flowers and their buds. These flowers are dull white and individually only 1/8" across.
Tall Boneset at Hoover Forest Preserve August 31, 2013
Tall Boneset along Sundown Lane August 26, 2013
Tall Boneset at Baker Woods Forest Preserve September 3, 2013
Tall Boneset foliage at Richard Young Forest Preserve August 29, 2012
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