Fact Sheet: Russian Knapweed (Jan 2014; PDF | 436 KB)
Alberta Invasive Plants Council (Canada).
Russian Knapweed (PDF | 1.95 MB)
Saskatchewan Invasive Species Council (Canada).
Federal Noxious Weed Disseminules of the U.S. - Fact Sheet: Acroptilon repens
USDA. APHIS. PPQ. Center for Plant Health Science and Technology; California Department of Food and Agriculture.
Alaska Exotic Plants Information Clearinghouse (AKEPIC): Species Biography - Species Biography - Russian Knapweed (Feb 4, 2011; PDF | 262 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 - Russian
University of Georgia. Center for Invasive
Species and Ecosystem Health.
Texas Invasives Database - Acroptilon repens
Invasive Species Compendium - Rhaponticum repens
Germplasm Resources Information Network (GRIN) - Rhaponticum repens
USDA. ARS. National Genetic Resources Program.
Fire Effects Information System (FEIS) - Acroptilon repens
USDA. FS. Rocky Mountain Research Station. Fire Sciences Laboratory.
Field Guide for Managing Russian Knapweed in the Southwest (Dec 2012; PDF | 2.38 MB)
USDA. FS. Southwestern Region.
PLANTS Database - Hardheads
National Plant Data Center.
Encycloweedia: Data Sheet - Russian Knapweed
California Department of Food and Agriculture.
Included on California's noxious weed list; see Encycloweedia: Program Details for additional resources.
Noxious Weed Species - Russian Knapweed
Colorado Department of Agriculture. Conservation Services Division. Noxious Weed Program.
B Noxious Weed: Russian Knapweed
Washington State Noxious Weed Control Board.
University of California. Statewide Integrated Pest Management Program.
Colorado State University. Cooperative Extension.
Weed Factsheet - Russian Knapweed (PDF | 203 KB)
New Mexico State University.
Know Your Knapweeds (PDF | 153 KB)
North Dakota State University. Department of Plant Sciences.
Noxious Weed Information - Russian Knapweed (B List)
Colorado Weed Management Association.
Species Fact Sheet: Russian Knapweed (2009; PDF | 337 KB)
Learning Center of the American Southwest.
Weed Identification - Russian Knapweed
Montana Weed Control Association.