Acknowledgements. 
51 
by which a plant is known in the United States Dispensatory 
-differs from that given in the last edition of Gray’s Manual, 
the former is quoted in parenthesis as a synonym of the latter. 
As a basis for comparison we have used the third edition of the 
Dispensatory and the sixth edition of Gray’s Manual. 
In the preparation of this list we have received much kind aid. 
Grateful acknowledgments are due to Dr. Charles R. Barnes, of 
the University of Wisconsin, for assistance rendered in the de¬ 
termination of the more difficult species of mosses; to Dr. L. M. 
Underwood, of the University of Texas, for the indentification of 
liverworts; to Dr. C. Warnstorf, of Neu Ruppin, Prussia, 
ior the determination of mosses belonging to the genus 
Sphagnum; to Dr. Charles Morong, of Columbia College, and to 
Dr. Stanley Coulter, of Purdue University, for the determina¬ 
tion of difficult species of flowering plants. 
For help rendered in compiling the list of flowering plants, we 
wish to express our thanks to Dr. H. L. Russell, Mr. G. W. 
Moorehouse and Mr. H. E. Case. For kindly suggestions on 
various points, we acknowledge indebtedness to Drs. Edward 
JKremers and W. H. Hobbs, both of the University of Wisconsin. 
We are indebted to Mr. I. M. Buell for the use of his corrected 
map of Dane county, which has been used freely. 
Madison, Wis., January 27, 1893. 
