CONTENTS 



Introduction 



The Tree and Its Parts: Page. 



Leaf 1 



Stem 7 



Root 7 



Bud 10 



Flower 11 



Fruit 14 



Distribution of Trees in Texas 15 



Influence of Trees on Climatic, Erosion and Run-off 16 



Shade Trees 17 



The Names of Plants 18 



How to Use the Key , 20 



Key to the Families and Genera 25 



Pi.naceae 33 



Arecaceae 46 



Juglandaceae 47 



Leitneraceae 53 



Myricaeeae 54 



Salicaceae ., 54 



Corylaceae 59 



Betulaceae 60 



Fa<>aceae 61 



Moraceae 88 



I 'Imaceae , 94 



Altingiaceae 101 



Anouacea 102 



Magnoliaceae 103 



Platanaceae 104 



Malaceae 105 



Amygdolaceae Ill 



Mimosaceae 114 



Cassiaceae 118 



Fabaceae 121 



Zygophyllaceae 125 



Koeherliniacaae 125 



Rutaceae . , 125 



