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Canadian Poisonous Plants Information Service
Canadian Biodiversity Information Facility -- Browse over 230 plants by botanical or common name to find well-organized records that contain references. A unique search engine allows one to search across all plant records in an organized fashion. Despite a natural bias towards Canadian plants, this is a high quality site.
Indiana Plants Toxic to Livestock and Pets
Indiana, Veterinary College -- This site is the best place to start unless you need references to the literature. Roughly 70 common plants can be searched by name, toxicity rating, species affected, and botanical type. Records are substantive, easy to read, and offer a description of the plant, affected animals, symptoms, first aid, and prevention.
Plants Toxic to Animals
Illinois -- This site provides brief records for about 70 plants with information on their distribution, how to control, toxic principles, and clinical signs.
Plants Poisonous to Livestock and Other Animals
Cornell -- Offers very brief records for over 80 plants along with references. The links for commonly affected species is the best feature.
Poisonous Plants of the southeastern United States
The Alabama Cooperative Extension System offers a free online publication that presents 57 poisonous plants found in the southeast. It includes pictures of the plant and information on toxicity, symptoms, and treatment.
National Library of Medicine -- These toxicology databases are searched simultaneously. It is best to search by chemical type, but keyword searching on the animal species and plant name can also be effective, especially in TOXLINE (which indexes the scientific toxicological literature).