THE BEST HARDY CONIFERS 121 



ones bending downward and sweeping the ground 

 and the uppermost slightly inclined upward, and 

 all have pendent, whip-like branchlets. The leaves 

 are dark green and the aspect of the tree, though 

 decidedly sombre, is graceful. 



For the colder parts of this country one of the 

 best of all Spruces is the Canadian or White Spruce 

 (P. canadensis). This is one of the hardiest of all 

 trees and is useful in ornamental and landscape 

 planting generally, but is especially so in situations 

 where other and less hardy coniferous trees will not 

 grow. It is a rather small tree and in the open it is 

 conical in outline and well furnished with branches 

 from the ground upward. The leaves are short, 

 green, and slightly glaucous. 



Another valuable species is Engelmann's Spruce 

 (P. Engelmannii), which hails from Colorado and 

 has somewhat the appearance of the common Blue 

 Spruce but the branches are shorter and flatter and 

 the leaves smaller and less glaucous. Specimens in 

 the Arnold Arboretum thirty-five years old are nar- 

 row, compact, symmetrical pyramids, but unfortu- 

 nately they are beginning to lose their lower branches. 

 The Serbian Spruce (P. omorika), which was dis- 

 covered only in 1872, has taken kindly to cultivation 

 here and elsewhere. It grows rapidly and the habit 



