Eupatorium compositifolium

Eupatorium compositifolium commonly called Yankeeweed is a North American herbaceous perennial plant in sunflower family native to the southern United States (from North Carolina to Florida and Texas).[3][4] Like other members of the genus Eupatorium it has inflorescences containing a large number of small, white flower heads, each with 5 disc florets but no ray florets. The plant is 0.5 to 2 metres (20-80 inches) tall.[5]

Yankeeweed

Secure  (NatureServe)[1]
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Asterales
Family: Asteraceae
Genus: Eupatorium
Species:
E. compositifolium
Binomial name
Eupatorium compositifolium
Walter 1788
Synonyms[2]

It is closely related to Eupatorium capillifolium and Eupatorium leptophyllum and some authors consider all of them to be varieties of E. capillifolium.[6] However, E. compositifolium is not as tall as E. capillifolium and is found in drier areas.[7]

Because it is not grazed by livestock, and mostly not eaten by wildlife, it is considered undesirable in places like pastures and controlled by means such as herbicides.[8]

References
  1. "Eupatorium compositifolium". NatureServe Explorer. NatureServe. Retrieved 2010-09-12.
  2. The Plant List, Eupatorium compositifolium Walter
  3. "Eupatorium compositifolium". Flora of North America.
  4. Biota of North America Program 2014 county distribution map
  5. "Eupatorium". Flora of North America.
  6. "Eupatorium capillifolium". Fire Effects Information System. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory. Retrieved 2008-08-06.
  7. Gregory E. MacDonald, Barry J. Brecke and Donn G. Shilling (Jul–Sep 1992). "Factors Affecting Germination of Dogfennel (Eupatorium capillifolium) and Yankeeweed (Eupatorium compositifolium)". Weed Science. 40 (3): 424–428. doi:10.1017/S0043174500051857. JSTOR 4045284.
  8. Robert E. Meyer and Rodney W. Bovey (Jan–Mar 1991). "Response of Yankeeweed (Eupatorium compositifolium) and Associated Pasture Plants to Herbicides". Weed Technology. 5 (1): 214–217. doi:10.1017/S0890037X00033558. JSTOR 3986818.
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