44 WEST-AMERICAN 



inches long. Near San Quentin, Peninsula of Cali- 

 fornia. Collected by A. W. Anthony, 1889. 

 No. 25 Chihuahua Pin - P* Ckihuahuana^ugelm. 

 Medium-sized trees, often with crooked trunks; 

 leaves in 3's. slender, 2^ to 4 inches long, glaucous 

 above, the sheath of long, shining, loose, deciduous 

 bracts, cones requiring three years to mature, top- 

 shaped, 1"J to 2 inches long, knobs of scales small, 

 bearing small, recurved, soon-falling prickles. Pecul- 

 iar for its three-year cones (the only case in America) 

 and among the Laterales, for its deciduous leaf- 

 sheaths.. Mountains of Southern Arizona and North- 

 ern Mexico. 



YEARLING CONES OF THE PINES. 



During the first of the two seasons required to mature 

 a pine cone, it enlarges but little, although the prickles 

 (if the cones are to be armed) are largely developed, and 

 the cones may have a different color than that they assume 

 during the second season. Pine cones are either almost 

 stemless, or with stems of different length, varying with 

 the species, from J to 4 inches. 



Most of the yearlings are globular. Such are the True 

 Nut Pines, with their light yellow little balls about f 

 inch thick, set close on the branchlet and devoid of 

 prickles. The Thimble-Cone Pines have smaller yearlings, 

 about J inch in diameter, rose-red and bristling with 

 long, slim prickles. The Prickle-Cone Pine has dark-red 



