20 WEST-AMERICAN 



Sub-Genus I. STROBUS. 



SOFT-WOOD OR WHITE PINES. 



Cones with the exposed part of the scales (the 

 apophysis) usually thin, and with an apical protu- 

 berance (urnbo), devoid of prickles or spines. Leaves 

 in 5's, short, 1 \ to 2 inches long, their sheaths loose 

 and deciduous. 



Wood mostly soft, whitish, less resinous than that 

 of the other sub-genus. Five species in Western 

 America, in Two Groups; 



Group I. Long-Cone Lumber 



Cones long, narrow, cylindrical, 8 to 26 inches 

 long and 1 to 4 inches thick, on long stems, becoming 

 pendent the second season and breaking the stem at 

 maturity. Trees usually very large, with grayish, 

 finely-checked bark; foliage light green. 



A peculiarity of this group of trees is the special- 

 ized long upper limbs bearing the cones, and the 

 short lower ones, which soon decay and fall; thus the 

 trees, self-trimmed while yet small, swell out their 

 matchless stems with smooth trunks reaching up to a 

 great height, affording the longest clear lumber 

 lengths for saw-logs of any tree known. 



Three Species:^ 



