28 



DENDROLOGY. 



Notes on the Distribution of Trees. 



[Except when otherwise stated, it is to be understood that observers whose names are 

 given in these notes are members of the Forest Service.] 



White-bark pine (Finns albicaulis). The eastern limit of white-bark pine in 

 Montana has been recently extended by J. H. Hatton, E. E. Carter, L. Wessel, 

 M. N. Stickney, and J. B. Leiberg (the latter not of the Forest Service). Mr. 

 Hatton found it in the Bear Paw Mountains, Chouteau County (longitude 109 

 30'), while Mr. Leiberg found it in 1903 in the Little Belt Mountains (longitude 

 110 40') on the summits of Mixes Baldy, Yogo Peak, and on Neihart Baldy. 

 Messrs. Carter and Wessel discovered it in 1907 in T. 14 N., R. 8 E., northeast of 

 Neihart, from which point this Office has received specimens. In 1906 Mr. 

 Stickney observed it still farther south on the high peaks of the Big Belt 

 Mountains (longitude 111 30'). 



Alpine fir (Abies lasiocarpa). Until recently alpine fir has been known in 

 Alaska only east of the Coast Range as far north as the head of Lynn Canal 

 (latitude 59 30') and Lake Bennett (latitude 60, longitude 135). Its abun- 

 dance here, however, led to the expectation that it would be found in the Yukon 

 Valley considerably farther northward and westward. George B. Sudworth. 

 recently recognized trees of this species in two excellent photographs taken by 

 F. C. Shrader and W. C. Mendenhall, of the U. S. Geological Survey, in the 

 Copper River country, which is 380 miles northwest of Lake Bennett. The 

 trees are scattered over the river bottom and lower mountain slopes of Copper 

 River at Copper Center (latitude 62, longitude 145 20') and in Mentasta Pass 

 between the Copper and Tanana drainage basins on the Copper River Yukon 

 Railway line. These points are the farthest northwestward in North America 

 ever recorded for any species of fir. The nearest and most northern point of 

 occurrence, besides Lake Bennett, is on the North Fork of the McQuestion River, 

 a branch of Stewart River (latitude 64 30', longitude 136), which is 260 miles 

 to the northeast, where the tree was discovered by J. Keele, of the Canadian 

 Geological Survey in 1905. 



The southern limits of Alpine fir in Idaho have been determined lately through 

 field notes of Dr. C. H. Merriam, Bureau of Biological Survey, G. E. Tower, 

 R. E. Benedict, W. T. Cox, H. P. Baker, C. E. Dunston, A. F. Boisen, J. B. 

 Bruins, E. H. Harefird, F. W. Reed, A. F. Potter, W. J. Gardner, and Smith 

 Riley. Beginning at the west, it has been reported from the Weiser, Payette, 

 Salmon River, Sawtooth, Lemhi, and Big Hole National Forests on the north of 

 Snake River, and from the Henry's Lake, Caribou, and Bear River National 

 forests on the south of Snake River. Southward in Utah it is known to occur 

 in all the mountains as far as the Sevier National Forest, but its distribution 

 in this part of the Great Basin is still imperfectly known, and it is hoped that 

 further and fuller reports will be made. J. B. Leiberg recently reported that in 

 southern Oregon it extends to the Umpqua-Rogue River divide and as far 

 south as the north side of the Siskiyou Mountains, an extension of about 60 

 miles. 



White fir (Abies concolor). The previously known range of this fir has been 

 recently extended into the high mountains of northern Utah, southern Idaho, 

 and northern Nevada through field notes of W. J. Gardner, A. F. Potter, F. W. 

 Reed, and Smith Riley, who have reported it from the Bear River and Raft 

 River National Forests, northern Utah and Southern Idaho ; from the Caribou 

 and Port Neuf National Forests, southeastern Idaho ; from Goose Creek, and 



