L. 1753 not (L.) L. 1774
Eupatorium altissimum (tall thoroughwort) is a perennial plant whose native range includes much of the eastern and central United States and Canada (Ontario south to Nebraska, eastern Texas, the Florida Panhandle, and Massachusetts. It almost always grows on limestone soils, as does Brickellia eupatorioides, with which it is often confused. It can hybridize with Eupatorium serotinum.
Eupatorium altissimum is a perennial herb sometimes more than 150 cm (5 feet) tall. Leaves and stems are covered with whitish hairs. The plant produces a large number of small white flower heads in a large flat-topped array at the top of the plant. Each head generally has 5 disc florets but no ray florets.
- "Eupatorium altissimum". NatureServe Explorer. NatureServe. Retrieved 2010-09-12.
- The Plant List, Eupatorium altissimum L.
- "Eupatorium altissimum". Flora of North America.
- Gregory J. Schmidt and Edward E. Schilling (2000). "Phylogeny and biogeography of Eupatorium (Asteraceae: Eupatorieae) based on nuclear ITS sequence data". American Journal of Botany. 87 (5): 716–726. JSTOR 2656858. PMID 10811796. doi:10.2307/2656858.
- "Eupatorium". Flora of North America.
- Missouri Plants, Eupatorium altissimum
- United States Department of Agriculture plants profile
- Photo of herbarium specimen at Missouri Botanical Garden, collected in Missouri in 2014
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