INTRODUCTION 5 
Easton, Pa., Herb. T. C. Porter, and his Herb. Pennsylvania. 
St. Louis, Mo., Herb. Missouri Botanical Garden, including 
Herb. Bernhardi, Herb. Engelmann, Herb. Buckley. 
Washington, D.C., Herb. U.S. Department of Agriculture, with 3 
Herb. L. F. Ward and Herb. H. W. Henshaw. 
Lincoln, Neb., Herb. University of Nebraska. 
Columbus, O., Herb. University of Ohio. 
