Poisonous Plants of PA - reproduction of the Commonwealth of Pennsylvania's "Poisonous Plants of Pennsylvania" publication by the Pennsylvania Department of Agriculture.

Indiana Plants Poisonous to Livestock and Pets - Cooperative Extension Service, Purdue U; excellent photos and info. Scroll down page to see index by plant, toxicity, species, botanical type, or photo.

Prevention of Plant Poisonings in Livestock & Pets Program - Virginia-Maryland Regional College of Veterinary Medicine (VMRCVM) at Virginia Tech; photos and info.

Poisonous Plants Informational Database – Cornell U. Dept of Animal Sciences. Search by plant using botanical or common name or by animal using Commonly Affected Species. There is also a section on Toxic Agents in Plants and Medicinal Plants for Livestock and other Animals.

FDA Poisonous Plant Database

American Association of Poison Control Centers 

Poison Help Hotline: 1.800.222.1222 

Staffed 24-hours a day for emergencies and questions.

"The general public may use the number to ask questions about the proper handling and ventilation related to household products, bites and stings, plants, over-the-counter and prescription medications, drugs, alcohol, hydrocarbons, carbon monoxide and other types of potentially toxic fumes and gases."