CONTRIBUTIONS FROM THE NEW YORK BOTANICAL 

 GARDEN— No. 131 



STUDIES ON THE ROCKY 

 MOUNTAIN FLORA-XXI 



By per axel RYDBERG 



NEW YORK 

 1910 



Reprinted, without change of pagin?, from tbeBuLLEXiN of the Toreky Botanical Club 37: 



127-148. ;^1 Mr 1910 



