16 The Colorado Experiment Station. 
the branchlets in brush-like tufts. The cones are about 8 cm. 
long and each scale is furnished at the tip with a slender curved 
bristle. On the branches of young trees the bark is at first smooth 
and milky white. On trunks of older trees the bark becomes 
irregularly divided into small scales of a brownish color. The 
\/ood is soft and light and possesses but little strength. It is 
sometimes used for mine timbers and fuel. 
This tree is of but little commercial importance and its slow 
growth does not recommend it for planting where quick effects 
are desired. 
LIMBER PINE, ROCKY MOUNTAIN OR WESTERN WHITE PINE. 
(Pinus Hexilis, James; Apinus Uexilis. Colo, Exp. Station Bulle¬ 
tin lOO, Rydberg.) 
(Plate III.) 
The common name of this pine is sugg'ested by the long, lateral 
branches which are quite stout and enable this tree to survive in the wind¬ 
swept situations which it usually inhabits. It is of low topped form and stout 
trunk and occurs often at high altitudes in rocky, exposed places. The 
needles grow in bundles of five and are about 5 cm. long. At a little distance 
this tree resembles the foxtail pine, but is readily distinguishabie from the 
latter species by the cones. Those of the limber pine are composed of nu¬ 
merous rather thin scales entirely free from prickles. The seeds are large 
and approach in size those of the pinion pine. In fact, this pine is not in¬ 
frequently mistaken for the true pinon. It is readily distinguished by the 
fact that the needles of the pinon are in bundles of two instead of five as in 
this species. 
The bark of the young branches and stems is smooth, light, gray or 
white, becoming deeply fissured and dark brown or nearly black on old 
trunks. The light, soft wood lis sometimes used for lumber, but is sure to be 
full of knots. 
The limber pine is quite widely distributed, occurring along the eastern 
slope of the Rockies from Alberta to western Texas and southern California. 
Its largest size, occasionally 15-20 m. high, is reached in northern New Mexii- 
co and Arizona. In Colorado this pine is scattered throughout the higher 
portions of the mountains. 
The limber pine is adapted to planting as an ornamental tree where 
large size lis not desired. 
Its hardy character enables it to thrive under cultivation and 
when thus grown it forms a tree of compact form and pleasing- 
appearance. It is worthy of a place in the home grounds. 
BULL PINE, ROCKY MOUNTAIN OR WESTERN YELLOW PINE, ROCK 
PINE. 
(Pinus scopulorum (Engelm.) Lemmon) 
(Plate IV.) 
This is the largest of our pines and forms the prinicpal evergreen of 
the foothills and ridges along the mountain ranges and' In the mountain 
parks. Outside this state it occurs in western Nebraska and from Montana 
to Arizona and New Mexico. On the Colorado plateau thiis tree forms the 
most extensive pine forests on the continent. Prom northwestern Nebraska 
