1208. 



constructed ones. Besides the native trees many introduced trees have 

 proved valuable. 



TREES FOR DIFFERENT REGIONS. 



To simplify the consideration of the kinds of street trees likely to 

 prove satisfactory, the United States has been arbitrarily divided 

 into the regions shown in figure 4, an endeavor being made to have 

 each division represent an area with similar growing conditions. 

 A discussion of the strong and weak points of the different kinds will 

 be found with the descriptions of the kinds further on in this bulletin. 



FIG. 2. Live oaks, the handsomest southern street tree for broad streets. Biloxi, Miss. ; 



late summer. 



Region i. 



Region 1 comprises the mild humid portion of the northern Pacific coast 

 east to the Cascade Mountains, including the western third of Washington and 

 <>n-cron and a portion of northern California. The trees native to western 

 Europe are adapted to this region, as the climatic conditions are quite com- 

 parable. Most of our American trees also succeed here. 



Desirable varieties for street planting in region 1 are the Oregon, Norway, 

 sycamore, and sugar maples ; California walnut ; tulip ; European linden ; bass- 

 wood; sycamore; London plane; white and European ashes; English and 

 American elms ; English, red, and pin oaks ; ginkgo ; and the black locust. 



Region 2. 



Region 2 is that portion of California lying between the Sacramento and San 

 Joaquin Valleys and the Pacific Ocean. Many varieties of trees will succeed 

 here if given water. Because of the lack of water, unless specially irrigated, 

 the more drought-resistant species should be used. 



Deciduous trees useful for this region are the London plane; the California 

 and common sycamore; English, Huntingdon, and American elms; Oregon, 



