100 STUDIES OF TREES 



UMBRELLA TREE {Magnolia tripetala) 



Distinguishing characters: The buds, Fig. 80, are 

 extremcl}- long, often one and a half inches, have a purple 

 color and arc smooth. The tree does not grow to large 

 size and ])roduces an open spreading head. Its leaves, 

 twelve to eighteen inches long, are larger than those of the 

 other magnolia trees. The tree is sometimes called elkwood. 



BLACK LOCUST {Robinia pseudacacia) 



Distinguishing characters: The bark of the trunk is 

 rough and deeply ridged, as shown in Fig. 8L The buds 

 are hardhj noticeable and often bear small spines on one 

 side. The leaves are small, delicate and fern-like. 



Form and size: The locust is a medium-sized tree 

 developing a slender straight trunk when grown alongside 

 of others; see Fig. 82. 



Range: Canada and United States. 



Soil and location: The locust will grow on almost 

 any soil except a wet, heavy one. It requires plenty of 

 light. 



Enemies: The locust borer has done serious damage to 

 this tree. The grubs of this insect burrow in the sapwood 

 and kill the tree or make it unfit for commercial use. The 

 locust miner is a beetle which is now annually defoliating 

 trees of this species in large numbers. 



Value for planting: It has little value for ornamental 

 planting. 



Commercial value: Though short-lived, the locust 

 grows very rapidly. It is extremely durable in contact 



