1. Poisonous
Plant Research, Agricultural Research Service (ARS), United States Department of Agriculture (USDA), 1150 East 1400 North, Logan, Utah 84341, United States
2. Forage
and Range Research, Agricultural Research Service (ARS), United States Department of Agriculture (USDA), 690 North 1100 East, Logan, Utah 84322, United States
3. Stanley
L. Welsh Herbarium, Brigham Young University, Provo, Utah 84602, United States