PHOPEfTTV OFM| 01 VISION OF 



FORESTRY 



COLLEGE OF A AGRICULTURE 

 UNIVERSITY OF CALIFORNIA 



PREFACE 



The present bulletin has been prepared to meet the needs of 

 those persons who desire to become more familiar with our native 

 and introduced trees, but who do not have access to the more 

 complete sets of books which treat this subject. It has been my 

 constant aim to avoid the use of technical terms, and only such 

 Lave been introduced as can be easily learned from the glossary 

 by the amateur student of nature who has had no previous train - 

 ing in botany. The scientific name and the common nam.es most 

 generally in use have both been given for each species. The 

 keys for the separation of families, genera, and species are based. 

 '.r\ so far as is possible, on the leaf characteristics. This is neces- 

 sary for the reason that the leaves remain on the tree throughout 

 the summer, while the flowers soon fall away. We should not 

 be deceived, however, into thinking that leaf characteristics de- 

 note natural relationship to the same degree as the characteris- 

 tics of the flower. It has sometimes been necessary to make use 

 of other characteristics of the tree, such as the fruit, bark, or 

 thorns in order to separate closely related genera or species. 



The list of trees herein given has been checked from Sud- 

 worth's "Check List of Forest Trees of America", Britton's 

 "North American Trees", and Sargent's "Manual of the* Trees 

 of North America." There will doubtless be a number of rare 

 cultivated varieties that have been omitted. 



The descriptions are based largely upon herbarium specimens 

 deposited in the herbarium of the University of Texas. The 

 collection of this herbarium material has extended over a period 

 of fifteen years, and has been accomplished by the various per- 

 sons who have been connected with the School of Botany during 

 that time. 



The drawings of leaf characteristics are taken from Gray'? 

 "Text Book of Botanv" and have been used by permission of 

 the American Book fop">panv to whom the author wishes to ex- 

 pross his indebtedness. The photographs for places 1, 23. 3, 24, 5. 

 are by Professor Wm. L. Bray, formerly Professor of Botany in 

 this University, published by him in his "Forest Resources or 

 Texas", and are here published with his permission. All other 

 line figures have been drawn from herbarium or fresh specimens 



