180 



TREES OP THE NORTHERN UNITED STATES 



species for cultivation. Wild in the North, and cultivated through- 

 out. There are varieties with bluish-green (var. ccerulea) and with 

 golden (var. aurea) foliage in cultivation. 



3. Plcea exc61sa, Link. (NOKWAY SPRUCE.) Leaves % to 1 in. 

 long, rigid, curved, dark green. Cones 5 to 7 in. long, and pendent 

 at maturity, with the scales slightly incurved. A large tree, 70 to 

 120 ft. high, of vigorous growth, with numerous, stout, drooping 

 branches ; abundant in cultivation. A score of named varieties are 

 sold at the nurseries, some quite dwarf, others so very irregular in 

 shape as to be grotesque. 



4. Picea polita, Carr. (TI- 

 GER'S- TAIL SPRUCE.) Leaves 

 ^ to % in. long, strong, ri- 

 gid, sharp-pointed, somewhat 

 curved, glabrous, bright 

 green, on stout branches with 

 prominent buds. Leaves per- 

 sistent for 7 years; not 2- 

 ranked. Cones 4 to 5 in. 

 long, spindle-shaped ellipti- 

 cal, rounded at the ends. 

 Tree of slow growth, with 

 horizontal, yellowish-barked 

 branches. As it is a tree 

 of recent introduction (1865) 

 from Japan, there are no large specimens. Hardy at Boston. 



P. polita. 



