Earth Partnership for Schools
"...a web-based project of the Plant Conservation Alliance's Alien Plant Working Group, that provides information for the general public, land managers, researchers, and others on the serious threat and impacts of invasive alien (exotic, non-native) plants to the native flora, fauna, and natural ecosystems of the United States." (From the Plant Conservation Alliance's web page.)
Site on invasive weeds that covers native vs. non-native plants, upsetting the natural balance, controlling weeds, Seed Bank lab (an experiment), what is a weed, seed dispersal, and other related topics.
"...APHIS has a major responsibility in preventing the spread of non-indigenous weeds into and through the United States. We are committed to using modern technologies to exclude, delimit. suppress, and eradicate non-indigenous weeds from the United States. These technologies will be appropriately applied and monitored to achieve environmentally sound and desirable management of invasive plants...we hope that this Home Page will serve as a focal point for accessing information about noxious weeds and their control and eradication." (From the APHIS Noxious Weeds Home Page.)
This site provides documents on various weed species (by scientific name), photographs , control methods, control tools, information on adaptive management, and things you can do to help fight invasive & noxious species.
This is a US Geological Survey site that provides species abstracts on approximately 15 invasive or noxious species found in three national monuments of the prairie and plains states, i.e., Scotts Bluff National Monument (Nebraska), Pipestone National Monument (Minnesota), and Effigy Mounds National Monument (Iowa). Each species is ranked on several criteria for each monument where it can be found. The abstracts give a history of the species' introduction, description, biology/ecology, distribution, control programs, and references. The information should be relevant wherever these species occur.