THE SILVA OF COLORADO Il7 



Pinus flexilis James. Limber Pine, Rocky Mountain White Pine 



Rydberg, Flora Colo. 8 (as Apinus flexilis); Coulter, Manual 431; Sargent, 

 Manual Trees of N. A. 7; Nelson, Key to Rocky Mountain Flora 6. 



Leaves in bundles of 5; stout, rigid, dark green, 3.5 to 7.5 cm. long. Stami- 

 nate flowers reddish, the carpellate bright red-purple. Cone very large, 7 to 25 cm. 

 long. Cone scales smooth, without bristle points. Seeds with a narrow wing 

 which usually adheres to the cone scale when the seeds drop. 



A small or medium-sized tree with a short main trunk and abundant lateral 

 branches, growing in wind-swept situations and hence often much distorted. Bark 

 of twigs and branches pale gray or whitish, becoming dark brown on older trunks. 

 Wood light; specific gravity 0.4358; sometimes used for lumber which is, however, 

 full of knots. This species was discovered in 1820 by Dr. Edwin James, of Major 

 Long's exploring party, near the base of Pike's Peak. 



Eastern slope of Rocky mountains from Alberta to western Texas, westward 

 through Montana to Nevada and California. It is the principal tree of the upper 

 foothills of the eastern slope in Montana. In Nevada it forms extensive forests. 

 In Colorado and Wyoming it is usually scattered in exposed situations at rather 

 high altitudes. 



The limber pine has not been extensively planted as an ornamental tree but has 

 done well where tried. In cultivation it has a handsome, rather symmetrical form. 



Pinus edulis Engelm. Pinyon, Nut Pine' 



Rydberg, Flora Colo. 8 (as Caryopitys edulis); Coulter, Manual 432; Sargent 

 Manual Trees of N.A. 11; Nelson, Key to Rocky Mountain Flora 5. 



Leaves in bundles of 2, rarely 3; dark green, curved, stiff, 2 to 4 cm. long. 

 Flowers dark red; the staminate in elongated clusters, the carpellate short stalked. 

 Cone when mature about the same length as the leaves and nearly spherical; cone 

 scales few, thick, spiny tipped. Seeds large, about the size of a small white bean, 

 the narrow wing of the seed remaining adherent to the cone scale when the seed 

 falls. 



A small or medium-sized tree, much branched and shrubUke. Bark rather 

 thin; that of young branchlet's orange colored, becoming at length gray or brown. 

 Wood rather durable; specific gravity 0.6388; brittle, close grained. Used for 

 fuel and fencing and sometimes for preparation of charcoal. In western Texas 

 it has been sawed for lumber. The large, edible seeds, collected by Indians, are on 

 sale by fruit dealers in the towns and cities of Colorado. 



Eastern foothills of the outer range of the Rocky Mountains from near the Palmer 

 Lake divide south to western Texas and west to Arizona and southwestern Wyo- 

 ming. At the head of the Arkansas it forms open forests with the rock pine; mixed 



"The author is indebted to Professor E. A. Kenyon, of Florence, Colo., for fresh material of this 

 species from which photographs were made. 



