220 Forestry Quarterly. 



Commercial Distribution in District I: Probably only on the 

 eastern side of the Continental Divide in Montana does this species 

 occur, and then only occasionally is it found of merchantable 

 size. When merchantable it usually forms but a small per cent 

 in mixture with other species. The trees are apt to be best de- 

 veloped when occurring in fairly dense stands of Douglas Fir, 

 Lodgepole Pine, or White-bark Pine, with which latter species it 

 is often confused. In a few places. Limber Pine has been noted 

 to form a considerable proportion of the merchantable timber. 

 On the west side of the Bridger Mountains, Gallatin National 

 Forest, Forest Assistant A. A. Saunders reports a mixed forest 

 which yields 8,000 feet to the acre, the Limber Pine forming 10 

 to 15 per cent, of the stand, — the remaining species being Douglas 

 Fir, Supervisor Bunker reports considerable bodies of Limber 

 Pine on the Lewis & Clark National Forest, particularly on the 

 North Fork of the Teton River and on Dupuyer and Birch Creeks, 

 extending eastward over the foothills and plains as much as 10 

 or 20 miles from the mountains. One body on Birch Creek 

 about 10 miles from the mountains comprises about 1,000 acres 

 Of the merchantable timber in the foothills and canyons of that 

 region, the Limber Pine forms i per cent. Farther from the 

 mountains in the vicinity of the same streams and their tributaries 

 it forms the major portion of the tree growth, and often exists 

 in pure stands. It is not certain whether this species exists in 

 commercial amounts in places other than those mentioned. 



In most localities, however, the trees are commonly scattered 

 or in small groups among other species, as stated above, and it is 

 comparatively seldom tha.t the trees will yield merchantable 

 logs. Whether or not Limber Pine grows west of the Conti- 

 nental Divide in Montana or Idaho is not yet definitely known, 

 but it is probable that the trees which have there been called 

 Limber Pine are in reality White-bark Pine (Pinus albicaulist) 

 These two white pines are very similar in occurrence, habits, and 

 in qualities and uses of the wood, and consequently there is a 

 great deal of confusion among Forest officers concerning them. 

 This is especially true in the Rocky Mountain Forests of Mon- 

 tana, where the two species are apt to mingle between the eleva- 

 tions of 5,000 and 8,000 feet. Generally speaking, however. White- 

 bark Pine appears to be the tree of the higher altitudes. 



Considerable stands of merchantable Limber Pine, so called, 



