EVERGREENS OF COLORADO 



Fig. 9. Lodgepole Pine, Pinus contorta murrayana. Dense forest of young trees fol- 

 lowing a forest fire 45 years before. These trees are 40 to 43 years old, 

 and 10 to 20 feet tall. Mountain slope, Estes Park. 



Fig. 10. Lodgepole Pine, Pinus contorta murrayana. A mature tree on mountain side, 

 near Pingree Park. 



Fig. 11. Lodgepole Pine, Pinus contorta murrayana. 



a. Trunk of immature tree 9 inches in diameter. Pingree Park. 



b. Terminal portion of branch with cones and needles. Near the tip are 



young cones which were in bloom last spring. Farther 

 down are nearly mature cones in their second season. Near the 

 base are cones three years old which have shed their seeds. 



Taken in August. One-half natural size. 







Fig. 12. Lodgepole Pine, Pinus contorta murrayana. 



a. Needles, two in each bundle, enlarged twice. 



b. Cross-section of a needle enlarged ten times. 



c. Mature, open cone. 



d. Closed or "tight" cone. 



e. Seeds, natural size. 



Fig. 13. 



Lodgepole Pine, Pinus ponderosa scopulorum. Mature tree, open-grown type, 

 bedded within an eight-inch log over sixty years old. 



Fig. 14. Pinyon Pine, Pinus edulis. Aged tree 15 feet tall. Owl Canyon. 



Fig. 15. Pinyon Pine, Pinus edulis. 



a. Portion of branch with needles and opening cones. Two seeds are 



exposed in the upper part of the left-hand cone. 



b. Mature closed cone. 



c. Seeds. All three-fourths natural size. 



Fig. 16. Blue Spruce, Picea parryana. Trunk of tree 19 inches in diameter and 60 

 feet tall. Along Buckhorn Creek. 



Fig. 17. Blue Spruce, Picea parryana. Twigs showing staminate flower cones. About 

 two-thirds natural size. 



Fig. 18. Blue Spruce, Picea parryana. Portion of branch showing two young pistillate 

 cones pointing upward, and two mature cones of last season hanging down- 

 ward. About one-half natural size. 



Fig. 19. Blue Spruce, Picea parryana. 



a. Portion of twig from which the needles have largely fallen, leaving 



the small stalk-like bases. 



b. Portion of twig with needles attached. Enlarged twice. 



c. Cross-section of a needle enlarged ten times. 



Fig. 20. Engelmann Spruce, Picea engelmanni. Two trees growing in the open, height 

 45 to 50 feet ; trunks 11 and 14 inches in diameter. Dense clusters of cones 

 appear in the tops of the crowns. Buckhorn Creek. 



Fig. 21. Engelmann Spruce, Picea engelmanni. Heavy stand of large specimens. Look- 

 out station, college forest. 



Fig. 22. Engelmann Spruce, Picea engelmanni. Near view of 39-inch trunk, show- 

 ing character of bark on mature trees. 



