Fact Sheet: Spotted Knapweed (Jan 2014; PDF | 794 KB)
Alberta Invasive Plants Council (Canada).
Alaska Exotic Plants Information Clearinghouse (AKEPIC): Species Biography - Spotted Knapweed (Feb 7, 2011; PDF | 148 KB)
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).
Invasive Plant Atlas of the United States - Spotted
University of Georgia. Center for Invasive
Species and Ecosystem Health.
Invasive Species Compendium - Centaurea stoebe subsp. micranthos
Global Invasive Species Database - Centaurea biebersteinii (herb)
IUCN. Species Survival Commission. Invasive Species Specialist Group.
Germplasm Resources Information Network (GRIN) - Centaurea stoebe
USDA. ARS. National Genetic Resources Program.
and Biological Control of Knapweed (Apr 2005, 3rd Ed; PDF | 2.85 MB)
Forest Health Technology Enterprise Team.
Fire Effects Information System (FEIS) - Centaurea maculosa
USDA. FS. Rocky Mountain Research Station. Fire Sciences Laboratory.
PLANTS Database - Spotted Knapweed
USDA. NRCS. National Plant Data Center.
Weeds in Australia -
Spotted Knapweed (Centaurea stoebe subsp. micranthos)
Australian Government. Department of the Environment.
Encycloweedia: Data Sheet - Centaurea genus
California Department of Food and Agriculture.
Included on California's noxious weed list; see Encycloweedia: Program Details for additional resources.
Noxious Weed Species - Spotted & Hybrid Knapweed
Colorado Department of Agriculture. Conservation Services Division. Noxious Weed Program.
Invasive Plants in Pennsylvania: Black, Brown and Spotted Knapweed (PDF | 1.2 MB)
Pennsylvania Department of Conservation and Natural Resources.
B Noxious Weed: Spotted Knapweed
Washington State Noxious Weed Control Board.
Best Management Practices: Spotted Knapweed (Feb 2010; PDF | 303 KB)
King County (Washington). Noxious Weed Control Program.
Wisconsin Department of Natural Resources.
Diffuse and Spotted Knapweed
Colorado State University. Cooperative Extension.
and Diffuse Knapweed - Noxious Weeds of Nebraska (PDF | 1.11 MB)
University of Nebraska - Lincoln. Cooperative Extension.
Introduced Species Summary Project - Spotted Knapweed
Columbia University. Center for Environmental Research and Conservation.
Your Knapweeds (PDF | 153 KB)
North Dakota State University. Extension Service.
Ohio Perennial & Biennial Weed Guide - Spotted Knapweed
Ohio State University. Ohio Agricultural Research and Development Center.
Knapweed (PDF |
University of Pennsylvania. Morris Arboretum.
Noxious Weed Information - Spotted Knapweed (B List)
Colorado Weed Management Association.
Weed Identification - Spotted Knapweed
Montana Weed Control Association.
BioBullies - Spotted Knapweed
Natural Biodiversity (Western Pennsylvania).
Plant Conservation Alliance. Alien Plant Working Group.
Spotted Knapweed - Aliens Among Us
Royal British Columbia Museum (Canada).