Eupatorium altissimum

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Tall thoroughwort
Eupatorium altissimum alt.jpg

Secure (NatureServe)[1]
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Asterids
Order: Asterales
Family: Asteraceae
Genus: Eupatorium
Species: E. altissimum
Binomial name
Eupatorium altissimum
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.[3]

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.[3]

Eupatorium altissimum is part of Eupatorium even when that genus is defined narrowly to include about 40 species of mostly white-flowered plants of North America, Asia, and Europe.[4][5]

Eupatorium altissimum flower


  1. ^ "Eupatorium altissimum". NatureServe Explorer. NatureServe. Retrieved 2010-09-12. 
  2. ^ The Plant List, Eupatorium altissimum L.
  3. ^ a b "Eupatorium altissimum". Flora of North America. 
  4. ^ 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. 
  5. ^ "Eupatorium". Flora of North America. 

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