2 University of California Publications in Botany [VOL. 9 



material than that in the Dudley Herbarium or preserved in the 

 Herbarium of the University of California. Through the aid of the 

 Harvard Club of San Francisco, I was enabled to spend a year and 

 a half in Cambridge, working principally at the Gray Herbarium, 

 where the types of many Californian and other western species are 

 preserved. While at Cambridge, I had constant aid from Professor 

 M. L. Fernald both in the critical examination of material and con- 

 cerning questions of nomenclature ; to his unfailing readiness to help 

 much of whatever merit this paper may possess is due. At the same 

 time, Dr. B. L. Robinson and Miss M. A. Day generously aided me 

 in every way possible, besides affording me free access to the collec- 

 tions in their charge. While in the east, I was also enabled to visit 

 the collections at the New York Botanic Garden and at the National 

 Herbarium, in Washington. After returning to the Pacific Coast, 

 residence at the University of California has permitted more detailed 

 examination of the material in the Herbarium of the University, 

 especially of the collections made by Dr. H. M. Hall and by Mr. and 

 Mrs. Brandegee, and has afforded opportunity as well for conferences 

 with them concerning localities, ranges, and special phases of the prob- 

 lems connected with the Sierran flora. While at Berkeley, I have also 

 had the advantage of consultation with Professor W. A. Setchell and 

 Professor W. L. Jepson, the latter loaning me material from his 

 private collection. To all of the above named persons, and to Drs. 

 D. H. Campbell and G. J. Peirce, of Stanford University, my warmest 

 thanks are due and extended, as well as to a number of other botanists, 

 and to friends living near the region the plant life of which is here 

 considered. 



The field work carried out in connection with the present report 

 has involved visits of varying duration to several sections of the range, 

 both for collecting material for herbarium study and for making'' field 

 examination of the vegetation of selected parts of the range. The 

 first of this series of visits was made in the summer of 1911 and the 

 last in 1917. All sections of the Sierra Nevada have been visited 

 except the extreme north in Plumas County, the Kern River region 

 of Tulare County, and the eastern flank of the southern Sierra west 

 of Owens Valley. 



