WOVE - 1918 
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 names most 
generally in use have both been given for each species. The 
keys for the separation of families, genera, and species are based. 
im 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- 
ties 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 
eultivated 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’s 
“Text Book of Botany’’ and have been used by permission of 
the American Book Company to whom the anthor wishes to ex- 
press his indebtedness. The photcgravhs for plates 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 of 
Texas’’, and are here published with his permission. All other 
line figures have been drawn from herbarium or fresh specimens 
