Trees for Town and City Streets. 11 



Region 13. 



Region 13 consists of the southern part of Florida. The deciduous trees 

 suitable for this section are the willow, Spanish, and southern red oaks; Amer- 

 ican elm ; Mississippi hackberry ; and in the southern half of the region the 

 Poinciana. 



Evergreen trees are better suited to region 13 than to any other portion of 

 the United States except possibly southern California. Among the best are 

 the live and laurel oaks, evergreen magnolia, camphor, rubber, silk oak, or 

 grevillea, and casuarina. 



TREES FOR SPECIAL PURPOSES. 



In the heart of a city, where the greatest difficulty is experienced 

 in getting trees to grow, the ailanthus will probably thrive when 

 nearly all other kinds fail. The sycamore and the London plane 

 are also good. The Carolina poplar will frequently grow in such 

 places and its use may sometimes be warranted. 



For very narrow streets the Lombardy poplar is the best tree. 

 (See fig. 1.) For use within the reach of ocean spray or on sandy 

 lands near the coast, the red oak and the red or scarlet maple are 

 suitable as far south as Charleston, S. C., while the sweet gum and 

 the live oak are equally good from Norfolk southward and along the 

 Gulf of Mexico. The red oak, sweet gum. #ed maple, and eastern 

 live oak are all grown successfully along the Pacific Ocean, while 

 the California live oak can be used from San Francisco southward. 

 The trees that endure the most alkali appear to be the bladder-nut 

 tree. London plane, peppermint gum arid its variety Eucalyptus 

 amygdalina angustifolia, and the Washingtonia and other hardy fan 

 palms, Canary Islands date palm, the camphor tree, and Acacia 

 cy clops and Acacia retinodes. Only the first two withstand severe 

 freezing weather. The red oak and the red maple are worth test- 

 ing for alkali conditions. 



DESCRIPTIONS OF STREET TREES. 



ACACIA. 



The acacias, or wattles, are a large group mostly of small trees 

 with showy yellow flowers. Although much used in California, 

 many of them are too small to make satisfactory shade trees, and 

 because of shallow rooting they are injurious to sidewalks. They 

 also stump-sprout badly. They thrive in regions 2 and 3 and in 

 restricted portions of regions 1 and 5. 



The Australian blackwood, blackwood acacia, or wattle, often 

 also called black wattle (fig. 6), is a strong, upright tree, growing 

 to a height of 75 feet and forming a well-shaped head. It is badly 

 affected by citrus scale, and on this account its planting is some- 

 times prohibited. 



