STANDLEY FLORA OF GLACIER PARK. 249 



The Aixtic-Alpiiie Zone may be studied easily at Iceberg Lake, 

 Cracker Lake, Ptarmigan Lake, Sexton Glacier, Gunsight Pass, 

 Swiftcurrent Pass, Sperry Glacier, and at various other easily acces- 

 sible localities. Frequently, also, patches of Arctic-Alpine vegeta- 

 tion are found at middle or even rather low altitudes, especially 

 where the snow lies late in the summer. On the rock slides above 

 Many Glacier Hotel, which may be reached m half an hour by an 

 easy climb, one may find most of the plants that grow on the rock 

 slides above Cracker Lake; and on the slopes of Altyn Peak, above 

 Many Glacier Chalets, many alpine species are represented. 



SCOPE AND PLAN OF THE FLORA. 



The present list is intended to include all the species of flowering 

 plants, ferns, and fern allies which have been found in the park. 

 The number listed is 955. With more thorough exploration the 

 list undoubtedly will be greatly increased, for no part of the 

 region has been thoroughly explored botanically, and the greater 

 portion of the park has not even been visited by a botanist. The 

 number of species still to be discovered can not be expected to be 

 proportional to the area which remains unexplored, for most of the 

 common plants of the park are included m this catalogue. Although 

 the flora is only imperfectly knowTi, it seems worth while to place on 

 record our present knowledge of it, for the region affords botanical 

 features of exceptional interest. The published flora will be found 

 useful not only in Glacier Park, but in many parts of western Mon- 

 tana and in adjacent Alberta and British Columbia. 



The list of species here presented is the result chiefly of field work 

 conducted by the author during July, August, and wSeptember, 1919, 

 under cooperation of the National Park Service of the Department of 

 the Interior and the United States National Museum. The explora- 

 tion was conducted primarily in order to obtain data for a popular 

 account of the plants of the park, which is to be published soon by 

 the National Park Service for the use of visitors to the region. It 

 was therefore necessar}^ to give chief attention to those portions of 

 the park most visited by tourists, and it was found that the investi- 

 gation of these areas required the whole time available for field work. 

 The writer visited all the localities generally seen by toiu-ists, and 

 covered most of the trails on foot. The larger part of the summer 

 was spent on the east slope, with headquarters at Many Glacier 

 Hotel, the most centrally located of all the hotels and camps. The 

 Many Glacier region was explored rather thoroughly, and its flora 

 and that of the region about the east entrance are now better 

 known botanically than any other portions of the park. Although 

 the writer was able to spend only three weeks on the west slope, and 

 those in late summer, it was possible nevertheless to cover all the 



