1. Department of BiologyWashington University Campus Box 1137 St. Louis, Missouri 63130 U.S.A.
2. Missouri Botanical Garden P.O. Box 299 St. Louis, Missouri 63166 U.S.A.
3. Botanical Research Institute of Texas509 Pecan St Fort Worth Texas 76102 U.S.A.
4. Department of Biological SciencesEastern Kentucky University521 Lancaster Ave Richmond Kentucky 40475 U.S.A.
5. Department of BiologyBrigham Young University-Idaho525 S. Center St Rexburg Idaho 83460 U.S.A.
6. Department of BotanyThe University of Tennessee Knoxville Tennessee 37996 U.S.A.