Affiliation: | 1. Missouri Botanical Garden St. Louis, Missouri 2. The New York Botanical Garden New York, New York 3. National Science Foundation, Washington, D. C. 4. Roosevelt University, Chicago, Illinois 5. Royal Botanic Gardens, Kew, Great Britain 8. University of Minnesota, Minneapolis, Minnesota 9. University of Southwestern Louisiana, Lafayette, Louisiana 10. Arnold Arboretum, Jamaica Plain, Massachusetts 11. Plant Research Institute, Ottawa, Ontario 12. The Morton Arboretum, Liste, Illinois 13. Interamerican Institute of Agricultural Sciences of the OAS, Lima, Peru
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