Idaho Weed Summit
- The Spread of Invasive Weeds in Western Wildlands.
- http://www.blm.gov/weeds/BOISUMMI.WPD.html

BLM National List of Invasive Weed Species of Concern
- The United States Bureau of Land Management's list of invasive weed species of concern in regions where the agency has responsibilities (western United States).
- http://www.blm.gov/co/st/en/BLM_Programs/botany/invasiweed.html

Connecticut Policy on Non-Native Invasive Plant Species
- Information provided by the state Department of Environmental Protection control measures, identification and education.
- http://www.ct.gov/dep/cwp/view.asp?a=2702&q=323496&depNav_GID=1641

Invasive Plant Atlas of New England
- Database of invasive and potentially-invasive plants in the region with management guide and calendar of events.
- http://nbii-nin.ciesin.columbia.edu/ipane/

California Exotic Pest Plant Council
- Dedicated to finding solutions to problems caused by non-native pest plant invasions of the state's natural areas.
- http://www.cal-ipc.org

Ecological Monitoring and Assessment Network
- Discusses the need for monitoring, role of naturalists, use of research collections, research methods, and species identification. Article is by Erich Haber.
- http://www.eman-rese.ca/eman/ecotools/protocols/terrestrial/exotics/intro.html#toc

Invasive Plants of Natural Habitats in Canada
- Discusses invasive species, methodology, and relevant legislation in Canada.
- http://www.cws-scf.ec.gc.ca/publications/inv/cont_e.cfm

Wisconsin Department of Natural Resources - Invasive Species
- Information about invasive plant and animal species in Wisconsin. Includes many detailed fact sheets.
- http://www.dnr.state.wi.us/invasives/

Invasive Weeds
- Photos and descriptions of invasive, noxious, and troublesome plants of North Dakota. Includes articles and weed control guide.
- http://www.ag.ndsu.nodak.edu/invasiveweeds/

Invasive Plants
- Information from the Canadian Botanical Conservation Network. Includes species list, facts about economic costs, and bibliography.
- http://www.rbg.ca/cbcn/en/projects/invasives/invade1.html

Institute of Pacific Islands Forestry - Invasive Plants in Hawaii
- Information about investigations of the ecology of invasive plant species; impacts of invasive species on forest health, management and restoration.
- http://www.fs.fed.us/psw/topics/ecosystem_processes/tropical/invasive/

Eastern Region Non-Native Invasive Species
- Information about management of exotic plant species in the forests of the northeastern United States.
- http://www.fs.fed.us/r9/wildlife/nnis/

Connecticut Invasive Plant Working Group
- Information about non-native invasive and potentially invasive vascular plants in Connecticut, USA.
- http://www.hort.uconn.edu/cipwg/

APHIS Web: Noxious Weeds
- APHIS has a major responsibility in preventing the spread of non-indigenous weeds into and through the United States.
- http://www.aphis.usda.gov/ppq/weeds/

Hawaii's Most Invasive Horticultural Plants
- Overview of the problem, list of invasive garden plants, and species accounts from the Hawaii Division of Forestry and Wildlife.
- http://www.state.hi.us/dlnr/dofaw/hortweeds/

Florida Exotic Pest Plant Council
- Includes information on invasive exotic species, database, proposed research and educational programs, control guides and management plans, mailing list, membership information, and links.
- http://www.fleppc.org/

Georgia Exotic Pest Plant Council
- Information about the adverse effects exotic pest plants have on the diversity plants and animals native to Georgia, USA.
- http://www.gaeppc.org/

Southeastern Exotic Pest Plant Council
- Information about exotic plants invading natural areas in the southeastern states, controlling invasive plants, and landscaping with native plants.
- http://www.se-eppc.org/

Invasive Woody Plants in the Tropics Research Group
- Global review of invasions resulting in a comprehensive database, an analysis of common characteristics and recommendations for management and control.
- http://www.bangor.ac.uk/~afs101/iwpt/welcome.shtml

Mid-Atlantic Exotic Pest Plant Council
- Addresses the problem of invasive exotic plants in the Mid-Atlantic region of the US. Brochure, e-mail group, organizational information, and links.
- http://www.ma-eppc.org/

Invasive Plants Association of Wisconsin
- Educational non-profit organization concerned with the control of exotic plant species in Wisconsin (USA).
- http://ipaw.org/

Federal Interagency Committee for the Management of Noxious and Exotic Weeds
- Information about management of invasive weeds in the USA.
- http://ficmnew.fws.gov/

Non-Native Invasive Terrestrial Plants in Florida
- Descriptions and images of 12 of the most invasive terrestrial plants in Florida.
- http://aquat1.ifas.ufl.edu/terinv.html

Biological Control of Non-Indigenous Plant Species
- Information and research from Cornell University on invasive plants. Information on Purple Loosestrife, Garlic Mustard, and Phragmites australis.
- http://www.invasiveplants.net/

Invasive Plants: Changing the Landscape of America: Fact Book
- Full text of 1998 publication by Randy Westbrooks, USDA-APHIS.
- https://www.denix.osd.mil/denix/Public/ES-Programs/Conservation/Invasive/intro.html

How Landowners Can Prevent Invasive Plant Species
- Tips offered for the average homeowner, gardener.
- http://aginfo.psu.edu/News/september99/species.html

Environmental Weeds at Bream Head
- A study of environmental weeds found on the coastal fringe of Bream Head and in private gardens at Ocean Beach and Urquharts Bay, Northland, New Zealand.
- http://www.igrin.co.nz/trisha/Breamhead.html

Invasive Grass Species In Southern Africa
- Invasiveness of a perennial soil pathogen-sensitive grass (Ammophila arenaria) and an annual grass (Cenchrus biflorus) in Southern Africa are studied in relation to soil pathogens, mycorrhizal fungi and genetic structure.
- http://www.nioo.knaw.nl/cto/invass/

MetroActive News & Issues: Alien Plants
- The dreaded Arundo, also known as giant reed grass, coming soon to a neighborhood near you.
- http://www.metroactive.com/papers/metro/05.01.97/plants-9718.html

Hawaiian Alien Plant Studies, UH Botany
- A forum to promote public awareness and exchange of information regarding problems associated with the spread of alien plant species.
- http://www.botany.hawaii.edu/faculty/cw_smith/aliens.htm

Plant Conservation Alliance - Alien Plant Working Group
- is a web-based project of the PCA 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 o
- http://www.nps.gov/plants/alien/

How to Prevent the Spread of Noxious Weeds
- Controlling weeds poses a special dilemma because, once a weed infestation is identified, it is often already so large that containment is difficult and expensive.
- http://www.blm.gov/education/weed/weed.html

Influence of Invasive Species on Coastal Plant Communities
- Abstracts of studies done on the California coast.
- http://www.sonoma.edu/people/cushman/research3.html

Department of Transportation- Invasive Species Policy Guidelines
- The Federal Highway Administrations directives on implementing the executive order on invasive species.
- http://www.fhwa.dot.gov/environment/inv_dot.htm

TNC Wildland Weeds Management & Research
- The Nature Conservancy's U.S. program for dealing with harmful invasive plant species threatening wild land biodiversity and invading TNC preserves. Site has weed alerts and resources on weed control.
- http://tncweeds.ucdavis.edu/

Redwood National and State Parks
- Exotic plant management of the over 190 exotic species invading Redwood Parks.
- http://www.nps.gov/redw/exotics.htm

The Invasive Plant Council of New York State
- A not-for-profit organization that provides guidance on the management of invasive plants with the goal of protecting biodiversity in New York (USA).
- http://ipcnys.org/

Invasive Species
- USGS Biological resources that deal with invasive plant species.
- http://biology.usgs.gov/cro/invasive.htm

Norwalk River Watershed Invasive Species
- Common and scientific species names along with detailed information about the particular invasive plant.
- http://www.norwalkriver.org/invsp.htm

Pacific Island Ecosystems at Risk
- Listings and descriptions of invasive plant species which threaten Pacific island ecosystems, particularly those of Micronesia and American Samoa.
- http://www.hear.org/pier/

The Worst Invasive Species
- The Nature Conservancy's national program for dealing with harmful invasive plant species on its preserves.
- http://tncweeds.ucdavis.edu/worst.html