ROCK PINE. ROCKY MOUNTAIN YELLOW PINE. 



Piniis ponderosn scopulorum Eiigelm.' 



Fig. 4. Branch with mature cones and young cones at the close of the first season, i ; a 

 detached cone, 2 (Note it has broken away from branch within the base, leaving a few scales 

 attached to branchlet) ; seeds and their wings, 3 ; detached terminal and branch buds, 4. 



5. Trunk of forest tree with cones at base. 



For these specimen and photograph of trunk I am indebted to Prof. B. O. Longyear. 



