CONTRIBUTIONS FROM THE NEW YORK BOTANICAL 



GARDEN— No. 172 



PHYTOGEOGRAPHICAL NOTES ON THE 

 ROCKY MOUNTAIN REGION 



III. FORMATIONS IN THE ALPINE 



ZONE 



P. A. RYDBERG 



NEW YORK 

 1914 



Reprinted, without change of paging, from Bulletin of the Torrey Botanical Cldb 



41: 459-474. 8 1914 



