Eupatorium album

Eupatorium album, or white thoroughwort, is a herbaceous perennial plant in the sunflower family native from the eastern and southern United States, from eastern Texas to Connecticut, inland as far as Indiana.[3][4]

White thoroughwort
Eupatorium album var album, 1913 botanical illustration.

Secure  (NatureServe)[1]
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Genus: Eupatorium
Species:
E. album
Binomial name
Eupatorium album
Synonyms[2]

As with other members of the genus Eupatorium, Eupatorium album flowers with large numbers of small white heads. The flower heads have 4-5 disc florets each, but no ray florets.[5] The plant grows 50–100 cm (20–39 in) tall,[3] making it one of the shorter Eupatorium species.[5]

Eupatorium album is capable of hybridizing with other Eupatorium species including Eupatorium sessilifolium and Eupatorium serotinum.[3] Its appearance is similar to Eupatorium altissimum, but differs in that the bracts (located at the base of the flower head) taper to a long point.[6]

Eupatorium album grows in dry, open areas such as power lines, old fields, and eroded slopes. It will not grow under a shady canopy, but can be found in some open woods such as pine barrens.[6]

Varieties[3]
  • Eupatorium album var. album - most of species range
  • Eupatorium album var. subvenosum A. Gray - Delaware, District of Columbia, New Jersey, New York
  • Eupatorium album var. vaseyi (Porter) Cronquist - from Alabama to Pennsylvania

References
  1. "Eupatorium album". NatureServe Explorer. NatureServe. Retrieved 2010-09-12.
  2. The Plant List, Eupatorium album L.
  3. "Eupatorium album". Flora of North America.
  4. Biota of North America Program 2014 county distribution map
  5. "Eupatorium". Flora of North America.
  6. Rebecca W. Dolan (September 2004). "Conservation Assessment for White thoroughwort (Eupatorium album L.)" (PDF). United States Forest Service, Eastern Region of the Forest Service - Threatened and Endangered Species Program.

Further reading
  • Herz, W; Sharma, Rp (March 1976). "New hydroxylated ent-kauranoic acids from Eupatorium album". The Journal of Organic Chemistry. 41 (6): 1021–6. doi:10.1021/jo00868a023. ISSN 0022-3263. PMID 1255283.


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