Stephen T. Lee,^* Kip E. Panter,^* Clive C. Gay,^* James A. Pfister,^* Michael H. Ralphs,^* Dale R. Gardner,^* Bryan L. Stegelmeier,^* Ernie S. Motteram,^* Daniel Cook,^* Kevin D. Welch,^* Benedict T. Green,^* T. Zane Davis<sup>*


*</sup>Authors are Chemist, stephen.lee@ars.usda.gov (Lee), Toxicologist (Panter, Welch), Rangeland Scientist (Pfister, Ralphs), Chemist (Gardner), Veterinary Pathologist (Stegelmeier), Plant Physiologist (Cook), Pharmacologist (Green), and Biochemist (Davis), Poisonous Plant Research Laboratory, Agricultural Research Service, US Dept of Agriculture, Logan, UT 84341, USA; and Professor Emeritus (Gay) and Research Associate (Motteram), Field Disease Investigation Unit, College of Veterinary Medicine, Washington State University, Pullman, WA 99164, USA. This research was supported by the Utah Agricultural Experiment Station, Utah State University, and approved as journal paper number 7988.