This resource provides the USDA's database of all vegetative information. From the homepage, you can easily navigate to search Invasive/Noxious weeds on the national level or via the state search.
This is another online resource that provides detailed information and photos for each of the plants listed on the federal noxious weeds list.
Similar to the federal list, this resource provides the same information for those plants listed on the California noxious weeds list.
The California State Department of Food and Agriculture website provides a database of state identified noxious weeds. See the "Noxious Weed Gallery & Data sheets" section at the url provided above.
A useful gallery of weeds to help identify your potential pest
Their stated is goal is "Protecting California's environment and economy from invasive plants." The site provides information, resources, and guidance for stopping the spread of invasive plants across the state.
The site provides information regarding managing agricultural pests.
