Deciduous 



173 



THE NETTLE FAMILY. 



Elm, Ulmus mantana, U. campestris, U. Americana. 

 These are well-known trees with obovate crowns, very 

 broad at the top, 

 oblique sprays 

 and sometimes 

 slender, pendu- 

 lous branches. 

 The elms are 

 excellent trees 

 for avenues, but 

 often become 

 easy prey for 

 insects which . 

 strip them of 

 every leaf in 

 dry summers. 

 They prefer 

 rich, loamy soil 

 with a gravelly 

 subsoil. Ulmus 

 campestris is ex- 

 c e 1 1 e n t for 

 hedges. Of this 

 species there are 

 several good 

 varieties, one with yellow leaves. The majority of its 

 numerous forms are of little or no importance. The same 

 may be said of the varieties of the Scotch elm ( U. Mon- 



FIQ. 88. NETTLE TREE (CELTIS OCCIDENTALS). 



