With this Web site from Florida Plants Online, you don't need to be a botanist to tell poison ivy apart from its benign look-alike, Virginia creeper. Photos and detailed identification tips, as well as numerous links to additional information, help readers learn how to avoid "one of nature's most dreaded plants." The site also includes information on how to diagnose a poison ivy reaction...

Spearheaded by Dr. Mary C. Smith and Professor Dan Brown of Cornell University's College of Veterinary Medicine and Department of Animal Science respectively, Poisonous Plants Web Pages contains color images of poisonous plants and affected animals, and provides information concerning the biological mechanisms, diagnosis and prevention of animal poisoning due to toxic plants and other natural...

The Toxic Plant Database was developed by a team of Professors working through Texas Cooperative Extension, a division of the Texas A&M University System. Although the database focuses on toxic plants in Texas, many of the plants are found in other states as well as Mexico. This is a well-organized website containing pictures, maps, plant descriptions, information on the toxic agent, symptoms of...