THE ORNAMENTAL PLANTS — CONIFERS 335 



Scrub pine, P. divaricaia {P. Banksiana) .* 



A small tree, more odd and picturesque than beautiful, but desirable in 

 certain places. 



Mugho pine, P. montana var. Mughus.X 



Usually more a bush than a tree (2 to 12 ft.), although it may attain a 

 height of 20-30 ft.; mentioned under Shrubs (p. 334). 



Norway spruce, Picea excelsa.X 



The most commonly planted spruce; loses much of its peculiar beauty 

 when thirty to fifty years of age ; several dwarf and weeping forms. 



White spruce, P. alha.*X 



One of the finest of the spruces ; a more compact grower than the last, and 

 not so coarse; grows slowly. 



Oriental spruce, P. orientalis. 



Especially valuable from its habit of holding its lowest limbs; grows 

 slowly; needs some shelter. 



Colorado blue spruce, P. pungens.*l 



In color the finest of the conifers; grows slowly; seedlings vary much in 

 blueness. 



Alcock's spruce, P. Alcockiana.X 



Excellent; foliage has silvery under surfaces. 



Hemlock spruce, Tsuga Canadensis.* 



The common lumber hemlock, but excellent for hedges and as a lawn 

 tree; young trees may need partial protection from sun. 



White fir, Abies concolor.*X 



Probably the best of the native firs for the northeastern region; leaves 

 broad, glaucous. 



Nordmann's fir, A. Nordmanniana. 



Excellent in every way; leaves shining above and lighter beneath. 



Balsam fir, A . balsamea.* 



Loses most of its beauty in fifteen or twenty years. 



Douglas fir, Pseudotsuga Douglasii.*X 



Majestic tree of the northern Pacific slope, hardy in the east when grown 

 from seeds from far north or high mountains. 



