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Guide to Poisonous Plants   Arrow divider image - marks separation between nested pages that are listed as breadcrumbs.

Close up of a purple larkspur plant with sagebrush in the background.

There are several varieties of larkspur, a plant species that can cause death in cattle due to alkaloids.
Photo by Matt Lavin. CC BY-SA 2.0.

Guide to Poisonous Plants

The Guide to Poisonous Plants is a searchable, online database of plants known to be poisonous to animals. It is provided by the James L. Voss Veterinary Teaching Hospital at Colorado State University.

Please note that the guide “is for reference only, and does not include all plants that can be toxic to animals. If you are concerned that your animal has ingested a poisonous plant, contact your veterinarian immediately.”

Search the Guide

The database can be searched by plant name (either common or scientific) or poisoning symptoms.