M. Barkworth. Utah State University Intermountain Herbarium. Adresse : UMC 45 Utah State University, Logan, UT. UT 8432; Mary@biology.usu.edu
J. Christopher Pires, boursier postdoctoral en agronomie, University of Wisconsin. Adresse : Department of Agronomy, University of Wisconsin-Madison, 1575 Linden Dr., Madison, WI 53706; jcpires@wisc.edu.
N. Turner. School of Environmental Studies, University of Victoria, nturner@uvic.ca
