IDENTIFICATION GUIDES for Invasive Species
General Guides
> Invasive Species Key (Discover Life IDnature Guide)
> A Field Guide to Aqatic Exotic Plants and Animals (Minnesota Sea Grant)
Photo Galleries
> NBII Invasive Species photos (NBII Image Library)
> Invasive.org - "Information and images of invasive and exotic species"
> Ontario Weeds Photo Gallery
Weed Guides
Web Site Guides
> Online Weed Identification Key (Illinois Council on Food and Agricultural Research)
> Invasive Plants of the Eastern United States: Identification and Control. Bargeron, Charles, T., Moorhead, David J., Douce, G. Keith, Reardon, Richard C., and Arthur E. Miller (technical Coordinators). 2003. The University of Georgia, USDA APHIS PPQ and USDA Forest Service Forest Health Technology Enterprise Team. FHTET-2003-08. Accessed May 16, 2005 online at http://www.invasive.org/eastern/
> Invasive Plants Identification Quiz (University of Connecticut, Department of Plant Science, Cooperative Extension System, Integrated Pest Management Program)
> Grass-like Weed Identification Guide (Virginia Tech.)
> Weed Identification Guide for grasses, sedges, and broadleaf weeds (U.S. Agricultural Products, BASF)
> Guide to the Common Thistles of Virginia (Dr. L. T. Kok, Professor of Entomology, Virginia Tech, Blacksburg, VA)
> Weed Identification (Weedawareness.org, Montana)
> Nonnative Invasive Plants of Southern Forests: A Field Guide for Identification and Control.
> A Field Guide to Aqatic Exotic Plants and Animals (Minnesota Sea Grant)
> Weedcenter.org Early Detection ID Cards: Yellow starthistle, Leafy spurge, Dalmatian toadflax, Spotted knapweed.
Compact Disc Guides
> 1,000 Weeds of North America (Illustrated CD)
> Flora Identification CDs. Comprehensive plant identification software and color photos of all known species of native and naturalized plants in British Columbia, Washington, Oregon, Idaho, Montana, Wyoming, Utah, Colorado, and North Dakota (Weed Science Society of America)
> Federal Noxious Weed Disseminules of the U.S. (CD) (Lucid applications)
> Species of Weeds in Turf (CD) (Lucid applications)
> Key to Common Suburban Weeds (CD) (Lucid applications)
> Weeds of the West (CD). An interactive computer-based diagnostic identification guide to 206 grasses and grass-like weeds of California.
Document Guides
> Invasive Plants Field and Reference Guide: An Ecological Perspective of Plant Invaders of Forests and Woodlands (USDA Forest Service) 
> Weed Identification References (gathered by Virginia Tech)
> Invasive Aquatic Plants Field Guide (Sea Grant)
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Plant Guides
Hint: Click here if you are looking for online herbarium or plant identification databases.
> An Interactive Key of Common Iowa Trees (Iowa State University Extension Forestry)
> Upper Peninsula Tree Identification Key (Michigan State University Extension)
> Key to Leaves of Virginia Trees (for use with the 4-H tree identification project)
> Bay Grasses Identification Key (Maryland Department of Natural Resources)
> A Key to the Common Trees of Camp Conestoga (For use at Camp Conestoga and the surrounding state park area (Laural Hill State Park -- Sommerset, Pennsylvania).
> Leaf Identification Key to Eighty-Eight Ohio Trees (Ohio State University Extension)
> Key to West Coast Spartina Species Based on Vegetative Characters (Mary Pfauth and Mark Sytsma, Biology Department, Portland State University)
Plant ID tools from Dendrology at Virginia Polytechnic Institute and State University:
> Leaf Key
> Twig Key
> Woody Plants in North America (2-CD set, interactive multimedia identification tutorial for woody plants found throughout North America).
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Invertebrate Guides (e.g. insects)
> Butterflies of North America (U.S. Geological Survey)
> Online Lady Beetle Pupae Identification Key (Univ. Minnesota, Entomology)
> Lady Beetle Identification Guide (Nature Canada)
> Wood-Boring Beetle Identification Keys (Texas A&M University)
> Field Guide to Common Texas Insects (Texas A&M University)
> Common Caterpillar Pests of Vegetables Identification Keys (Texas A&M University)
> Key to Cockroach Identification (Pesticide Education Resources, University of Nebraska-Lincoln)
> Aquatic Macroninvertebrate Identification Key (Stream Study Website, Department of Environmental Sciences, University Virginnia)
> Beach Assessment Clam Identification Key (King County Department of Natural Resources, Seattle, Washington)
> Online Zebra Mussel Field Guide (University of Wisconsin Sea Grant - Zebra Mussel Watch)
> Apple Snail Identification Guide (www.applesnail.net)
Vertebrate Guides (e.g. mammals)
> A Field Guide to Aqatic Exotic Plants and Animals (Minnesota Sea Grant)
> Tadpoles of the United States and Canada: A Tutorial and Key (USGS Patuxent Wildlife Research Center)
> ID tools from the Cortland Herpetology Connection (where high school students help with the New York State Department of Environmental Conservation's Amphibian and Reptile Atlas):
> Frog Key
> Salamander Key
> Turtle Key
> Lizard & Snake Key
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Wallet Size Invasive Species Identification Cards
Wallet-sized identification cards you can print and carry with you. Put one in your wallet, tape it to the dash board on your boat or car, or give them out to your friends.
> Minnesota Sea Grant Exotic Invasive Species ID cards in PDF format for: Eurasian ruffe, Eurasian watermilfoil, European frogbit, purple loosestrife, round goby, rusty crayfish, and the waterflea. Also available for FREE online at www.invadingspecies.com.
> Order a zebra mussel watch card from the University of Wisconsin's Sea Grant - Zebra Mussel Watch program.
> Hydrilla Hunt ID Card (Michigan SeaGrant)
> Weeds you should get to know weed deck (The Nature Conservancy). Wallet cards for identifying old world climbing fern, Japanese climbing fern, cogon grass, tropical soda apple, downy rose myrtle, and Chinese tallow tree.
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