CO NR -BE A RERS. 51 



axillary or terminal. Sixteen species, five in North- 

 west America. 

 Two groups: 



Croup I. Interior Species. 



No. 1 White Spruce P- laxa, .-argent. 



Trees of far Northern regions, including the valley 

 of Yukon River, with glaucous or white leaves. 



No. 2 Blue Spruce - - P* pungens, Eogelm. 



Rocky Mountains and westward to Wyoming, 

 along streams. Remarkable for its sharp and very 

 glaucous leaves. 



NO. 3 Engelmann's Spruce 



P. JBngelmanni t Engelm. 



Rocky Mountains and westward to the Northwest 

 regions. Branchlets short and usually slender; cones 

 elliptical, 2 to 21f inches long. Abundant on the 

 Rocky Mountains, extending to the Cascade Range, 

 but not reaching California. Appearing again in 

 Northern Arizona. 



ARIZONA SPRUCE. Var. Franciscana. n. var. * 



More robust but not as lofty trees, with long-retained 

 lower limbs, and stout, short branchlets, J of an inch 

 thick, and larger cones, scales, seeds, etc. 



* New variety, not before published. 



