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Spotted Knapweed

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Spotted knapweed
Spotted knapweed, flowers - USDA APHIS PPQ, Oxford, North Carolina
Scientific Name: 
Centaurea stoebe L. subsp. micranthos (Gugler) Hayek (ITIS)
Synonym: 
Centaurea biebersteinii DC., Centaurea maculosa auct. non Lam. (ITIS)
Common Name: 
Spotted knapweed
Native To: 
Europe (Zouhar 2001)
Date of U.S. Introduction: 
Late 1800s (Zouhar 2001)
Means of Introduction: 
Accidentally through contaminated seed or ballast (Zouhar 2001)
Impact: 
Crowds out native species and forage for livestock (Zouhar 2001)

Distribution / Maps / Survey Status

University of Georgia. Center for Invasive Species and Ecosystem Health.
Provides state, county, point and GIS data. Maps can be downloaded and shared.

Images

University of Georgia. Center for Invasive Species and Ecosystem Health.

Videos

Google. YouTube; DOI. National Park Service. Great Lakes Restoration Initiative.

Google. YouTube; Montana Department of Agriculture.

Selected Resources

The section below contains highly relevant resources for this species, organized by source. Or, to display all related content view all resources for Spotted Knapweed.

Council or Task Force

Invasive Species Council of British Columbia (Canada).

See also: Factsheets for more resources

Alberta Invasive Species Council (Canada).
See also: Fact Sheets for more information about individual invasive species, including those listed as "Prohibited Noxious" and "Noxious" under the Alberta Weed Control Act

Washington State Recreation and Conservation Office. Washington Invasive Species Council.

Partnership
University of Alaska - Anchorage. Alaska Center for Conservation Science.
See also: Non-Native Plant Species List for additional factsheets (species biographies) and species risk assessment reports of non-native species present in Alaska and also non-native species currently not recorded in Alaska (potential invasives)
IUCN. Species Survival Commission. Invasive Species Specialist Group.
University of Georgia. Center for Invasive Species and Ecosystem Health.
Federal Government

USDA. FS. Forest Health Technology Enterprise Team.

See also: Invasive Species Publications for more publications
USDA. FS. Rocky Mountain Research Station. Fire Sciences Laboratory.
USDA. NRCS. National Plant Data Center.

USDA. ARS. National Genetic Resources Program. GRIN-Global.

International Government
Australian Government. Department of the Environment and Energy.
State and Local Government
Washington State Noxious Weed Control Board.
California Department of Food and Agriculture.
See also: Included on California's noxious weed list; see Encycloweedia: Program Details for additional resources
Missouri Department of Conservation.
See also: Problem Plant Control (scroll to Invasive Plants section) for more information to help you identify and control most common invasive plants in Missouri
Pennsylvania Department of Conservation and Natural Resources.
See also: Invasive Plant Fact Sheets for plant species (trees, shrubs, vines, herbs and aquatic plants) that have impacted the state's natural lands
King County Department of Natural Resources (Washington). Water and Land Resources Division.

Colorado Department of Agriculture. Conservation Services Division. Noxious Weed Program.

Wisconsin Department of Natural Resources.

Academic
University of Pennsylvania. The Pennsylvania Flora Project of Morris Arboretum.
See also: Invasive Plant Fact Sheets for additional invasive plants in Pennsylvania
Columbia University. Center for Environmental Research and Conservation.
North Dakota State University. Extension Service.
University of Nebraska - Lincoln. Cooperative Extension.
Ohio State University. Ohio Agricultural Research and Development Center.
Professional
Colorado Weed Management Association.
Montana Weed Control Association.

Citations

  • Integrated Taxonomic Information System. Centaurea stoebe ssp. micranthos. [Accessed Mar 22, 2015].
  • Zouhar, K. 2001. Centaurea maculosa. In: Fire Effects Information System. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory.