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

Provides state, county, point and GIS data. Maps can be downloaded and shared.

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

Montana State University Extension.

USDA. NRCS. National Plant Data Center.

Lincoln County Noxious Weed Control Board (Washington).

See also: Weed I.D. and Options for Control for more species

University of California. Weed Research and Information Center.

See also: Weeds in Natural Areas for more information sheets