We thank Aaron Liston (Oregon
State University, Corvallis), Matt Lavin (Montana State University,
Bozeman), Edith Gómez-Sosa (Instituto de Botánica
Darwinion, San Isidro, Buenos Aires, Argentina) Matt Johnson (Desert
Legume Program, University of Arizona, Tucson), Kelly Steele
(California State University, Hayward), Bill Hevron (Navajo Nation,
Window Rock, AZ), Michael Donoghue (Harvard University Herbaria,
Cambridge), Patrick O'Grady (AMNH, NY), Robert Bellsey (University of
Arizona), Andrew Salywon (Arizona State University, Tempe), Judith
Becerra (University of Arizona), Cindy Salo (University of Arizona),
Richard Spellenberg (New Mexico State University) and David Stout
(U.S. Department of Agriculture, Plant Introduction Station,
Washington State University, Pullman) for providing plant materials,
DNA samples, unpublished DNA sequences, photographs, comments on
manuscripts, and the curators of the following herbaria for specimens
used in our work: ARIZ, University
of Arizona Herbarium,
Tucson; DAV, University
of California, Davis;
COLO, University
of Colorado Herbarium,
Boulder; A, Arnold Arboretum, Harvard
University Herbaria,
Cambridge; RENO, University of Nevada, Reno; RM, Rocky
Mountain Herbarium,
University of Wyoming, Laramie; and US, National Museum of Natural
History, Smithsonian Institution, Washington, D.C.
This work has been
supported by grants from the United States National
Science Foundation
(DEB-9407824), the University of California to MJS, and the
University of Arizona Foundation to MFW. The work has been conducted
at the University
of Arizona, Tucson,
Cornell University, Ithaca, NY, and the University
of California at Davis.
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