

DEPARTMENT OF THE INTERIOR 



Albert B. Fall, Secretary 



UNITED STATES GEOLOGICAL SURVEY 



George Otis Smith, Director 



Professional Paper 130 



THE LARAMIE FLORA OF THE DENVER BASIN 



WITH A REVIEW OF THE LARAMIE PROBLEM 



BY 



F. H. KNOWLTON 



WASHINGTON 



GOVERNMENT PRINTING OFFICE 



1922 



