University of Minnesota. Minnesota Sea Grant.
Montana State University.
The Center for Invasive Species Management closed in 2015. Archives of relevant materials are available here.
University of California Cooperative Extension. Napa County.
University of California - Berkeley.
University of California - Riverside. Entomology.
University of California - Riverside. Center for Invasive Species Research.
Mississippi State University. Extension Service.
Mississippi State University. Geosystems Research Institute.
University of Texas - Austin. Lady Bird Johnson Wildflower Center.
Provides lists of native plants recommended for various purposes (by State or Canadian Province). Once you have selected a collection, you can browse the collection or search within it using the combination search. Also provides other special collections resources.
University of California. Division of Agricultural and Natural Resources. Cooperative Extension.
West Virginia University Extension Service.
University of California. Cooperative Extension.
Mississippi State University. Center for Resolving Human-Wildlife Conflicts.