PREFACE vii 
of the proof and to Mr. E. J. Alexander for cooperation in studies on 
many genera and species. 
The completion of the manuscript was made possible, in part, by the 
eooperation of the Board of Managers of The New York Botanical Garden. 
The publieation was made possible, in part, by the interest of the late 
Mr. Charles Deering. 
The numerous specimens, which the investigations connected with this 
work have brought to the author during a period of thirty-five years, along 
with much botanical information, have been incorporated in the herbarium, 
the museums, and the records of the Garden. 
JOHN K. SMALL. 
THE NEW YORK BOTANICAL GARDEN, 
Bronx PARK, NEw York, N. Y. 
November 30, 1933 
