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U.S. Department of Agriculture
National Invasive Species Information Center
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Invasive Species Resources

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New Jersey Weed Gallery

Rutgers Cooperative Research and Extension. New Jersey Agricultural Experiment Station.
A collection of photos and descriptions of agricultural weeds found in New Jersey.
UC IPM Weed Photo Gallery
University of California. Statewide Integrated Pest Management Program.
The UC IPM Weed Photo Gallery includes many, but not all, weed species commonly found in California farms and landscapes.