Authors are Plant Physiologist,[email protected](Cook), Rangeland Scientist (Ralphs), Toxicologist (Welch), and Veterinary Pathologist (Stegelmeier), Poisonous Plant Research Laboratory, Agricultural Research Service, United States Dept of Agriculture, 1150 E 1400 N, Logan, UT 84341, USA. Published with the approval of the Director as Journal Paper No. 8040 of the Utah Agricultural Experiment Station.
