Giftpflanzendatenbank Uni Zürich
Informationszentrale gegen Vergiftungen der Universität Bonn
Canadian Poisonous Plants Information System
Cornell University Poisonous Plants Page
University of Illinois Plants Poisonous to Animals
A phytochemical database with plants ranked by chemical content.
National Animal Poison Control Center
Botanical.com: A Modern Herbal (Mrs. M. Grieve)
An American bibliographic database (alphabetized)
Zentrums des Datenverbundnetzes der Schweizer Flora