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Medusahead Resources

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Plumas-Sierra Noxious Weeds Management Group (California).
See also: Agricultural Brochures for more species
University of Georgia. Center for Invasive Species and Ecosystem Health.
Provides state, county, point and GIS data. Maps can be downloaded and shared.
California Department of Food and Agriculture.
See also: Included on California's noxious weed list; see Encycloweedia: Program Details for additional resources
Alberta Invasive Plant 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
USDA. FS. Rocky Mountain Research Station. Fire Sciences Laboratory.
University of Georgia. Center for Invasive Species and Ecosystem Health.

California Invasive Plant Council.

In online book: Bossard, C.C., J.M. Randall, and M.C. Hoshovsky (Editors). 2000. Invasive Plants of California's Wildlands. University of California Press. Berkeley, CA
University of Georgia. Center for Invasive Species and Ecosystem Health.

Wisconsin Department of Natural Resources.

Washington State University. Whitman County Extension.

Colorado Weed Management Association.
Colorado Department of Agriculture. Conservation Services Division. Noxious Weed Program.
USDA. NRCS. National Plant Data Center.
USDA. ARS. National Genetic Resources Program. GRIN-Global.
Wallowa Resources (Oregon).
See also: Top Ten Weeds in Wallowa County for more fact sheets
Google. YouTube; Oregon State University.