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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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ARS Image Gallery
USDA. Agricultural Research Service.
Image Gallery is provided as a complimentary source of high-quality digital photographs available from the USDA's Agricultural Research Service, Office of Communications.
CIPWG Photo Notebook
Connecticut Invasive Plant Working Group.
Citrus Canker Photos

Florida Department of Agriculture and Consumer Services. Plant Industry.
Citrus Resource - Gallery Links

USDA. APHIS. PPQ. CPHST. Identification Technology Program.
Each tool (Citrus ID, Citrus Diseases, Citrus Pests) includes a comprehensive image gallery with filtering capabilities.
Forestry Images
Forestryimages.org.
Published by: University of Georgia. Bugwood Network; USDA. Forest Service.
Global Invasive Species Team - Image Archive
Invasive.org.
Archive from the Nature Conservancy, Global Invasive Species Team.
IAS Photo Gallery
Secretariat of the Convention on Biological Diversity.
Invasive Species Photo Gallery: Non-Native Plant Species
Wisconsin Department of Natural Resources.
Invasive Species Photos

Alberta Invasive Species Council (Canada); Flickr.

Contains common invasive plant species found in Alberta and Western Canada.
Invasive.org - Images of Invasive and Exotic Species

University of Georgia. Center for Invasive Species and Ecosystem Health.
King County (Washington) Noxious Weed Control Program
King County Department of Natural Resources (Washington). Water and Land Resources Division.
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.
Non-Native Species Image Gallery
Great Britain Non-Native Species Secretariat.
Pests and Diseases Image Library (PaDIL)

Australian Plant Biosecurity Cooperative Research Centre. Pests and Diseases Image Library.

Provides high quality images and information tools designed for biosecurity and biodiversity.
PLANTS Database - Image Gallery
USDA. NRCS. National Plant Data Center.
See also: Gallery Images for All Scientific Names - Introduced Plants (North America) search results
South Dakota Least Wanted - Photo and Video Gallery
South Dakota Game, Fish and Parks.
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.