^lEBSm OP TOio^ 



LIBRARY OF* 



OF THE 



ROCKY MOUNTAINS 



AND 



ADJACENT PLAINS 



COLORADO, UTAH, WYOMING, IDAHO, 



MONTANA, SASKATCHEWAN, 



ALBERTA, 



AND NEIGHBORING PARTS OF 



NEBRASKA, SQUTH DAKOTA, NORTH 

 DAKOTA, AND BRITISH COLUMBIA 



BY 



P. A. RYDBERG, Fh. D. 



Curator, New York Botanical Garden 



SECOND EDITION 



NEW YORK 



Published by the Author 

 1922 



