PIN ACE AE (PINE FAMILY) 33 



EE. Leaves 3.7-6.2 cm. long, persistent for 5-8 years; old bark divided into elon- 

 gated plates; cones 3.7-7.5 cm. long, not opening at maturity; prickles of cone 

 scales at tip, pointing toward cone tip. C. P. albicaulis (WHITE-BARK PINE) 



EEE. Leaves 3.7-7.5 cm. long, persistent for 5-6 years; old bark divided into 

 isodiametric plates; cones 7.5-25 cm. long, opening at maturity; prickles of cone 

 scales at very tip, pointing toward cone tip. C. E. P. flexilis (LIMBER PINE) 

 DD. Cones 15-45 cm. long, their stalks 12-75 mm. long; cone scales with obsolete 

 prickles or none, thin; seeds shorter than their wings; leaves 3.7-10 cm. long; bark 

 green where smooth (or whitish in P. monticola). 



F. Cones 1.2-2.8 dm. long; seed ^ as long as its wing; old bark 3.7 cm. or less 

 thick, broken into isodiametric plates; smooth younger bark whitish. W. C. E. 



P. monticola (WESTERN WHITE PINE) 



FF. Cones 3-4.5 dm. long; seed ^ as long as its wing; old bark 7.5 cm. or less thick, 

 broken into elongated plates; smooth younger bark greenish. C. 



P. lambertiana (SUGAR PINE) 



Y. & R. EL. FL. 3 



