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 paging, from theBuLLEiiN of the Toeeey Botanical Club 37: 



127-148. 31 Mr 1910 



