6 PREFACE. 



In the preparation of this work the writer is indebted for assistance, 

 first of all, to Dr. A. W. Chapman, the veteran Southern botanist; to 

 Prof. Charles S. Sargent for aid rendered in the free use of the 

 library of the Arnold Arboretum and advice in perplexing questions 

 of nomenclature, and to Mr. Charles Faxon, of the Arnold Arboretum, 

 for bibliographical assistance; to Dr. N. L. Britton and Dr. J. K. Small, 

 of the Columbia University; to Dr. William Trelease, of the Missouri 

 Botanical Garden; to Prof. F. Lamson-Scribner, chief of the Division 

 of Agrostology, United States Department of Agriculture: to Mr. F. V. 

 Coville, chief of the Division of Botany, and his assistant Mr. T. H. 

 Kearney, jr. ; and to Dr. J. N. Rose and Mr. Charles L. Pollard, assistant 

 curators of the National Herbarium, for facilities afforded; also to 

 Dr. Edward L. Greene, of the Catholic University, for his revision of 

 doubtful and new forms of Compositae; and to Prof. L. H. Bailey for 

 his help in Carex. Thanks are due, also, to Dr. B. E. Fernow, late 

 chief of the Division of Forestry, for help rendered in the arrangement 

 of the general part of the work for the press, and to Mr. George B. 

 Sudworth, dendrologist of that Division; and lastly to Mr. C. D. 

 Beadle, director of the Biltmore Herbarium, and his associate, 

 Mr. F. E. Boynton, for their assistance while consulting the Biltmore 

 Herbarium and Library. 



The writer with pleasure takes this occasion to express his gratitude 

 for the friendly aid extended to him by many of his fellow-citizens 

 while engaged in the lield, and to President Milton Smith, of the 

 Louisville and Nashville Railroad, to the Hon. T. G. Bush, president of 

 the Mobile and Birmingham Railway, and to Col. E. L. Russell, presi- 

 dent of the Mobile and Ohio Railroad, for courtesies liberally extended 

 to him in his travels through the State. Without the aid received 

 from these sources the appearance of this volume could not have been 

 accomplished. 



CHARLES MOHR. 



