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Publication No. 10. Journal Series from the Atkins Garden and Research Laboratory of Harvard University, Soledad, Cienfuegos, Cuba (where much of the work was done). The previous parts of this serial appeared in Phytologia3: 145–149, 155 (1949).
Acknowledgements. Throughout the development of this paper, advice and help was received from my former colleague, Mr. Charles L. Gilly; also, the distributional maps are his handiwork. My thanks are tendered. I wish, likewise, to acknowledge the kindness of various herbarium curators who made available plant specimens without which this study would have been impossible; I am grateful particularly...
In the course of the present study I have had encouragement from many friends who have helped to find the cherries in the field and who have been generous with loans of herbarium material. A part of the field-work was made possible by grants in research from the Horace H. Rackham School of Graduate Studies, University of Michigan, and a part of the cost of publication has been defrayed by a grant...
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