Biota of North America Invasive Species Database
Biota of North America, Search species lists by state.
Brooklyn Botanic Garden Pest Alert
Detailed listing of websites that contain information on invasive plants. Includes references to websites that deal with global, national, regional and local "problem" species.
Global Invasive Species Program Database
So far, contains limited number of plant species but all places where they have been reported to be a problem.

National Park Service Invasive Species Links
Lists internet resources on invasive species. Provides access to a wide range of relevant websites.
Plant Database USDA
General plant database with state noxious weed lists for 36 states. Hoping to expand to county level data for all species.
Weed Technology (2004). Volume 18, Issue 5
Proceedings with abstracts from the Conference on Invasive Plants in Natural and Managed Systems: Linking Science (IPINAMS) and Management and 7th International Conference on Ecology and Management of Alien Plant Invasions (EMAPI7).
November 3-7, 2003 in Ft. Lauderdale, FL