SHADE, LAWN, AND PARK TREES. 



329 



311. Box Elder (Acer negundo). This tree is discarded 

 by Maynard, who says: " It soon takes an irregular form, 

 is easily broken by wind and ice, and is rather short-lived." 

 As found native in the Northwest this is not correct. If 

 properly grown in nursery with straight stem, it makes a 

 handsome round-topped tree, is not as liable to injury from 

 wind or ice as most other trees, and has proven a long-lived 

 species. No shade tree yet planted in the prairie States 

 makes a denser shade. 



312. The Silver and Red Maples. The soft or silver 

 maple (Acer dasycarpum, Erhr; A. saccharinum, Linn) is 

 much used in the East and Southeast. 



The Western type is a clean, thrifty 

 tree when planted, but has lost in 

 popular favor, as it is liable to be 

 broken by storms and sleet. But this 

 can be avoided by giving the upright 

 form shown in Fig. 90. It runs into 

 varying varieties as grown from seed. 

 Among those propagated, Wier's cut- 

 leaved is most valuable perhaps for 

 giving variety to group-planting. 



313. The Red Maple (Acer rubr urn) 

 is used to some extent at the East and 

 Southeast for ornamental planting, 

 on account of its bright-red flowers 

 and fruit and its varied-colored leaves 

 in autumn. 



As found native in Wis- 





consin, the species varies in form, FIG. 90. Properly 

 becoming more compact and more shaped shade 

 closely resembling the native sugar maple. 



314. The Elms. The white elm ( Ulmus Americana) is 

 one of the grandest trees of the temperate zones for street 

 and avenue planting, and it should have a place in parks 



