Eupatorium altissimum

Eupatorium altissimum, the 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]

Tall thoroughwort

Secure  (NatureServe)[1]
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Genus: Eupatorium
Species:
E. altissimum
Binomial name
Eupatorium altissimum
L. not (L.) L.
Synonyms[2]

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

References
  1. "Eupatorium altissimum". NatureServe Explorer. NatureServe. Retrieved 2010-09-12.
  2. "Eupatorium altissimum L.". The Global Compositae Checklist (GCC) – via The Plant List.
  3. Siripun, Kunsiri Chaw; Schilling, Edward E. (2006). "Eupatorium altissimum". In Flora of North America Editorial Committee (ed.). Flora of North America North of Mexico (FNA). 21. New York and Oxford – via eFloras.org, Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
  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. doi:10.2307/2656858. JSTOR 2656858. PMID 10811796.
  5. Siripun, Kunsiri Chaw; Schilling, Edward E. (2006). "Eupatorium". In Flora of North America Editorial Committee (ed.). Flora of North America North of Mexico (FNA). 21. New York and Oxford – via eFloras.org, Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.


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