1910] Hall: Studies in Ornamental Trees and Shrubs. 3 



the groups here treated, easy, artificial keys to the species have 

 therefore been prepared, and many illustrations added. 



The garden investigations were undertaken as a part of the 

 author's duties as assistant botanist to the Agricultural Experi- 

 ment Station of the University of California. Financial aid 

 was received from grants from the Adams Fund of the United 

 States Government, but this paper is not to be considered as 

 the sole result of these investigations, or even as the most im- 

 portant result. The critical examination of specimens gathered 

 during the course of this study was undertaken at the Univer- 

 sity, where free use was made of the botanical library and of 

 the herbarium. 



It is a pleasure to acknowledge the assistance received from 

 numerous nurserymen, gardeners, and other residents of Cali- 

 fornia, who have allowed the writer a free examination of their 

 plants and supplied much valuable information. Dr. F. Fran- 

 ceschi and Mr. W. H. Morse, of Santa Barbara, Mr. Compton of 

 Montecito, Mr. Ernest Braunton and Mr. L. A. Greata, of Los 

 Angeles, Mr. D. W. Coolidge, of Pasadena, Miss K. 0. Sessions, 

 of San Diego, Mr. John McLaren, Superintendent of Golden 

 Gate Park, San Francisco, and many others should be mentioned 

 in this connection. Among the foreign correspondents who have 

 supplied -critical notes, or specimens for comparison, it is a pleas- 

 ure to mention Dr. J. H. Maiden, Government Botanist for New 

 South Wales, Mr. T. F. Cheeseman, of the Museum at Auckland, 

 the late Mr. H. J. Matthews, formerly Chief Forester of New 

 Zealand, and Mr. Joseph Burtt-Davy, Government Botanist for 

 the Transvaal. Mr. C. N. Forbes, of Honolulu, has supplied 

 valuable material from the Hawaiian Islands. 



I am indebted to Mr. Harry Evans for the preparation of 

 line drawings used in figures 1 to 13, and to Miss Carlotta Case 

 for the one used in figure 15. The drawings used in plates 3, 

 4, and 5 are all the work of Mrs. Louise Nash. Of the text 

 figures, no. 2 is adapted from Curtis' Botanical Magazine, plate 

 2246; no. 5 is from Hooker's Icones Plantarum, plate 447; and 

 no. 14 is a tracing from Lindley's Botanical Register, plate 410. 

 All of the others are original, drawn either from the living plant 

 or from herbarium specimens. All line drawings used in the 

 preparation of the plates are original, except figure 2 of plate 3. 



