. Carnegie Institution of Washington publication. INTRODUCTION. 7 Kearney, and Professor A. O. Garrett have all sent specimens from Utah; Profes- sor T. D. A. Cockerell and Mr. Merritt Gary have sent specimens from Colorado; Dr. P. A. Rydberg has brought many specimens from the Rocky Mountain region; Messrs. Paul C. Standley, E. O. Wooton, Vernon Bailey, and H. L. Shantz have sent specimens from the southwestern United States; Brother Leon, of the Colegio de la vSalle, Havana, and Dr. Juan T. Roig, of the Estacion Agronomica, Santiago de las Vegas, Cuba, have contributed Cuban specimens, and D
. Carnegie Institution of Washington publication. INTRODUCTION. 7 Kearney, and Professor A. O. Garrett have all sent specimens from Utah; Profes- sor T. D. A. Cockerell and Mr. Merritt Gary have sent specimens from Colorado; Dr. P. A. Rydberg has brought many specimens from the Rocky Mountain region; Messrs. Paul C. Standley, E. O. Wooton, Vernon Bailey, and H. L. Shantz have sent specimens from the southwestern United States; Brother Leon, of the Colegio de la vSalle, Havana, and Dr. Juan T. Roig, of the Estacion Agronomica, Santiago de las Vegas, Cuba, have contributed Cuban specimens, and Dr. J. A. Shafer has collected widely in Cuba; Mr. William Harris, of Hope Gardens, Jamaica, has col- lected for us in Jamaica; Dr. John K. Small has obtained collections from nearly all over the southeastern United States, aided by Mr. Charles Deering. Dr. Henry H. Rusby and Dr. Francis W. Pennell have contributed plants and specimens from Colombia, collected in 1917 and 1918. Mr. Frederick V. Coville, of the United States Department of Agriculture, has made many valuable suggestions during the progress of the investigation. In our studies we have also had use of the cacti of the following American collections: Herbarium of the Missouri Botanical Garden at St. Louis; the Gray Herbarium of Harvard University; the Rocky Mountain Herbarium at Laramie, Wyoming; the collection of the United States Department of Agriculture; the herbarium of the University of California, especially the Brandegee collection; and the herbarium of the Field Museum of Natural History. The types of the new species described in this work are deposited in the herbaria of the New York Botanical Garden and the United States National Museum, unless otherwise indicated. In greenhouse collections many kinds of cacti grow very slowly, and flower only after many years' cultivation. We have a number of plants of this kind from various parts of America. It is hoped that some of them may bloom during the period of pu
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