A Study of the Street Trees of Lincoln 59 



si-Mom living to attain a diameter over 18 inches; and rarely 

 exceeds 40 feet in height. It is susceptible U attack by fungi 

 and insects, and when once attacked by either, the tree deterior- 

 ates rapidly. It is one of the poorest species that can be planted 

 in a citv for shade purposes. 



COTTON WOOD. 



C'ottonwood grows rapidly, attains a large diameter and 

 good height, compared with other trees found in the city. It 

 develops a long and open crown which is often cut back in 

 order to cause it to spread and thicken. This treatment is not 

 reconinu-nded. since it gives an ungainly appearance to a street 

 tree. As the branches are easily broken due to the weakness 

 of the wood the trees become a source of danger. The roots 

 spread to a great distance and cause much damage by pushing 

 out curbing and raising up walks. This tree is unsuitable for 

 street planting and many cities forbid its use as a street tree. 



SYCAMORE. 



Sycamore is one of the best trees planted in the city. It 

 grows rapidly, and attains a good size. Fifty feet is not an 

 unusual height, with a diameter of from 10 to 15 inches. It has 

 a well-shaped and compact crown, but it does not form dense 

 shade even though its leaves are quite large. This tree has 

 been grown extensively in many of the large cities with marked 

 success. 



HACKBERRY. 



For a rather slow growing tree, but one that will form 

 good shade, Hackberry is one of the best. It grows well on 

 almost any site, either wet or dry. The crown is generally corn- 

 pad and has a dense foliage. It attains a height of from 35 to 

 40 feet and a diameter of from 14 to 18 inches. The bole is 

 gene-rally straight and grows to a considerable height before 

 forking. 



Xot all the trees in Lincoln are in poor condition, for some 

 have been well cared for or arc- naturally well formed trees. 

 The Red Oak (Qnercits ruhra) and the- Tin Oak ((jitereits 

 paiustrisj, although not found in any of the sample plots, were 

 carefully studied, and seem, beyond doubt, to be two of the 

 most desirable species found. Both have excellent shaped 



