EVERGREENS OF COLORADO 73 



ILLUSTRATIONS 



Frontispiece (Blue Spruce in Color). 



Fig. 1. Flowers and fruit of a pine, (Pinna cnntorta murrayana) , on new growth. 



a. Staminate flower cones, natural size. 



b. Pistillate flower cones, natural size. 



c. A staminate flower cone, enlarged twice. 



d. A pistillate flower cone, enlarged twice. 



e. Three stamen flowers, enlarged ten times. 



f. A pistil scale, showing two ovules at base, enlarged ten times. 



g. A mature cone scale showing lower side with spine near the tip, en- 



larged twice. 



h. A mature cone scale showing upper side and the two seeds with 

 wings separating from it. 



Fig. 2. Bristle cone Pine, Pinus aristata. 



a. Grove of trees on slope of Pikes Peak. 



b. Two small trees showing the whitish bark of young specimens. Moun- 



tains above Manitou. 



c. Trunk of an old tree fifteen inches in diameter. Mountains above 



Manitou. 



d. Portion of branch with cones and needles, one-half natural size. 



Fig. 3. Limber Pine, Pinus flexilis. 



a. Tree with trunk nine inches in diameter. Mountains above Manitou. 



b. Trunk of an old tree twenty inches in diameter. Mountains above 



Manitou. 



c. Portion of branches with cones and needles. One-half natural size. 



d. Mature, open cone. 



e. Seeds, both three-fourths natural size. 



Fig. 4. Limber Pine, Pinus flexilis. Bundle of needles. 



a. Just unfolding from within the sheath of thin scales. 



b. Scales of the sheath ready to fall away. 



c. The sheath-scales fallen. (Enlarged twice). 



Fig. 5. Yellow Pine, Pinus ponderosa scupulorum. Mature tree, open-grown type, 



50 feet tall, trunk 25 inches in diameter. Foothills near Fort Collins. 

 Fig. 6. Yellow Pine, Pinus ponderosa scopulorum. 



a. Trunk of immature tree, fourteen inches in diameter, showing black- 



ish scaly bark, known among lumbermen as "blackjack" pine. 



b. Portion of a branch showing cones and needles, one-half natural size. 



c. Mature, open cone, one-half natural size. 



d. Dwarfed specimen growing from a crack in a large rock. This tree, 



at least 40 years old, as shown by the annual growth rings upon 

 its stem, illustrates the tenacity of the species. 



Fig. 7. Yellow Pine, Pinus ponderosa scopulorum. Trunk of a mature tree 38 inches 

 in diameter, showing thick bark, divided into broad ridges or plates of a 

 cinnamon red color. Estes Park. 



Fig. 8. Yellow Pine, Pinus ponderosa scopulorum. 



a. Short portion of twig with bundles of needles showing two and three 



needles in a bundle, enlarged one and three-fourths times. 



b. Cross-section of needles, enlarged ten times. 



c. Seeds, natural size. 



