Appreciation 



In an unusual degree, this work is the fruition of a cooperative effort on the part 

 of many persons, including the staff members of several libraries and herbaria. Gene- 

 rous and friendly assistance has been given by staff members of the Botany Depart- 

 ment, the Forestry Department and the Herbarium, University of Nanking, Nanking; 

 the Musee Heude, Aurora University, Shanghai; the Herbarium and the Biological 

 Library, University of California, Berkeley; the Arnold Arboretum and the Gray 

 Herbarium, Harvard University, Jamaica Plain and Cambridge, Massachusetts; the 

 United States National Herbarium, Smithsonian Institution, Washington, D. C. 



The following persons are among the many in China and in America whose 

 cooperation has made the completion of the project possible: E. D. Merrill, identi- 

 fications, helpful criticism, inspiration; Alfred Rehder, identification of woody plants; 

 C. S. Fan, drawings, descriptions and keys for woody plants, Chinese names; Charles 

 DeVol, Pteridophy ta ; Y. L. Keng (Keng, Yi-li) and Agnes Chase, Gramineae; Charles 

 Schweinfurth, Orchidaceae; G. L. Stebbins, Cichorieae; Y. H. Li (Li, Yang-han), C. 

 C. Hu (Hu, Ch'ang-chih), and S. Y. Hsu (Hsu, Shiu-ying), Chinese names; I. M. 

 Johnston, helpful criticism; C. E. Kobuski, editorial advice; S. F. Blake, Compositae; 

 Lincoln Constance and Mildred Mathias, Umbelliferae; H. K. Svenson, Cyperaceae; 

 Duane Isely and P. L. Ricker, Leguminosae; H. L. Li, Araliaceae and Scrophulari- 

 aceae. 



The encouragement, and the patient and very able secretarial assistance of the 

 author's wife, Celia B. Steward, have been indispensable to the completion of the 

 manuscript. 



Generous grants were given by the John Simon Guggenheim Foundation in 1951 

 and 1953 to support work done at the Arnold Arboretum, University of California and 

 at Oregon State College. 



President A. L. Strand, of Oregon State College, arranged leave of absence and a 

 grant to carry on the herbarium work at Corvallis during the summer of 1952, while 

 the author and his wife were engaged in necessary work on the manuscript at the 

 Arnold Arboretum. 



Dean H. P. Hansen, of the Graduate School at Oregon State College, has been a 

 wise and sympathetic counselor on matters relating to arrangements for publication 

 of the manuscript. 



Albert N. Steward 

 Corvallis, Oregon 





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