48 posteista 



on the highest peaks. Of the truly 

 alpine plants mention may be made 

 of the following: Silene acaulis, Ar en- 

 aria sajanensis, Dry as octopetala, Mer- 

 tensia alpina, Polemonium confer turn, 

 Phacelia glandulosa and species of 

 Saxifraga, Draba and Erigeron. 



Concluding Remarks, What has 

 been said of the distribution of plants 

 in Colorado refers entirely to that part 

 of the State east of the front range 

 and drained by the South Platte river. 

 In crossing the range to the west, a 

 new flora is encountered, and in pass- 

 ing the divide which separates the 

 drainage areas of the Platte and the 

 Arkansas, many southern plants are met 

 with. 



An attempt has been made to in- 

 dicate in very general terms the na- 

 ture of the plant population in different 

 situations. Plants of the plains have 



