Invasive Species Slide Library
Great Lakes Indian Fish and Wildlife Commission.
Field Guide to Noxious and Other Selected Weeds of British Columbia
British Columbia Ministry of Agriculture, Food, and Fisheries (Canada).
Hoary Cress Consortium - Invasion Images
USDA. ARS. Northern Plains Agricultural Research Laboratory.
Identification: Weed Photo Gallery
University of California. Statewide Integrated Pest Management Program.
Invasive Plants of Northeastern Wisconsin
University of Wisconsin - Green Bay. Cofrin Center for Biodiversity.
A list of the most serious invasive species in northeastern Wisconsin.
Invasive Plants of Wisconsin Photo Gallery: Non-Native Species
Wisconsin Department of Natural Resources.
Invasive Plant Species of New England - Photo Gallery
New England Wild Flower Society.
New Jersey Weed Gallery
Rutgers Cooperative Extension.
A collection of photos and descriptions of agricultural weeds found in New Jersey.
Ohio Perennial & Biennial Weed Guide
Ohio State University. Ohio Agricultural Research and Development Center.
Includes a photo key intended to help the casual user identify a weed. Weeds that look similar are grouped together.
Alberta Invasive Species Council (Canada).
Contains common invasive plant species found in Alberta and Western Canada.
Saltcedar Biological Control Consortium Grant.
Plant Image Gallery
The Plant Image Gallery is an ongoing project which currently includes over 600 species of vascular plants. There are nearly 5000 species of vascular plants known to Texas and nearly 3000 species of vascular plants known to Oklahoma.
Plants of Hawaii
Includes native and non-native plants known from Hawaii.
PLANTS Database - Image Gallery and Search results for Introduced Plants (North America)
USDA. NRCS. National Plant
Biology, and Identification (click Image Galleries tab)
Montana State University. Center for Invasive
Washington's Noxious Weeds
Washington State Noxious Weed Control Board.
Weed Science Society of America.