RUSTS FROM GLACIER NATIONAL PARK, 

 MONTANA 



Paul C. Standleyi 



During the summer of 1919, the writer spent ten weeks in Gla- 

 cier National Park, under the direction of the National Park 

 Service, for the purpose of securing data concerning the flora of 

 the region. Attention was devoted almost wholly to the flower- 

 ing plants and vascular cryptogams, but a few of the lower 

 cryptogams were secured incidentally, and a small amount of 

 time was spent in searching specially for rusts. Sixty-one spe- 

 cies of these interesting plants were secured, and since they come 

 from an area in which very little botanical collecting has been 

 done, it may be worth while to publish a list of them. The list 

 is particularly deficient in grass rusts, for grasses were not col- 

 lected, and consequently the rusts that may have existed upon 

 them were likewise neglected. 



The writer is under obligations to Dr. J. C. Arthur, who has 

 kindly determined the collections. The specimens are in the 

 U. S. National Herbarium, and duplicates of most of them are 

 in Doctor Arthur's herbarium. 



The flowering plants of Glacier Park are of great interest. 

 The flora of the east slope of the Park is similar to that of the 

 central Rocky Mountains, but the flora of the west slope shows 

 a marked relationship with that of the Pacific Coast. Many spe- 

 cies of plants, especially of trees, find the eastern limit of their 

 range there^ and many plants which are common in Alberta and 

 British Columbia extend into the United States in northwestern 

 Montana, but are rare or absent elsewhere south of the inter- 

 national boundary. 



The material collected during the season of 1919 has served as 

 the basis of a popular account of the plants of the Park, to be 

 issued by the National Park Service, and of a technical flora of 

 the region, to be published by the National Museum. 



1 Published by permission of the Secretary of the Smithsonian Institution. 



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