The content of this publication is based upon information given in a day-long symposium on poisonous plants held at the 40th Annual Meeting of the Society for Range Management at Boise, Idaho, February 1987.

First published in 1988. Livestock poisoning by plants has been a problem to the livestock producers of the United States since our pioneer forefathers first grazed their herds of cattle and sheep on the vast rangelands and pastures of this country. It has long been recognized that poisonous plants are not only disruptive to the harvesting of the