STANDLEY — ^FLORA OF GLACIER PARK. 239 



lively low elevations on northward slopes, and plants of low altitudes 

 at high elevations on sunny slopes. In Glacier Park the snow banks 

 remain on northward slopes all through the summer at rather low 

 elevations, and about them one finds many plants which are char- 

 acteristic of alpine meadows. On exposed southward slopes above 

 timber line one often comes unexpectedly upon plants which ordi- 

 narily grow far below upon the plains or foothills. 



The greater number of the plant species, except those which grow 

 upon the prairie or the highest summits and rock slides, range 

 through two zones, but some are more widely dispereed, and a few 

 are found nearly everywhere. The following list includes those 

 species which are found at almost all altitudes, the zone names in 

 parentheses indicating the region in which each is most abundant, 

 if it is noticeably more abundant anywhere : 



Zygadenus elegans (Hudsonian). 



Allium cernuum (Canadian). 



Eryihronium grandiflorum (Hudsonian). 



Ranunculus reptans (Canadian). 



Pamassia Jlmbriata (Hudsonian). 



Saxifraga hronchialis. 



Heuchera glabella. 



PotentiUa fruticosa (Hudsonian). 



Astragalus alpinus (Arc tic- Alpine). 



Hedysarum sulphurescens (Hudsonian). 



Linum lewisii. 



Epilohium latifolium (Hudsonian, Aj-c tic-Alpine). 



Dodecaiheon pauciflorum (Hudsonian). 



Galium horeale. 



Campanula rotuvdifolia. 



Aster meritus (Hudsonian, Ai"c tic-Alpine). 



Achillea lanulosa. 



Gaillardia aristata (Transition). 



It will be noticed that these are all herl^aceous plants, and only a 



few of them are divided by any author into two or more species. 



The life zones represented in Glacier Park ^ are four — Transition, 



Canadian, Hudsonian, and Arctic-Alpine (see plate 34). These are 



discussed below. 



TRANSITION ZONE. 



On the east slope of the park this zone is well represented, for it 

 includes all the plains, part of the foothills, and the low valleys (see 

 plate 35), and in warmer, exposed places it extends up to an alti- 

 tude of about 1,350 meters. In this part of the Rockies the Transi- 



' A map showing the distribution of the life zones in the park is included in the 

 "Wild Animals of Glacier Park," by Vernon Bailey. 



