a PREFACE 
Especial acknowledgments are due to Professor Benjamin 
L. Robinson, Director of the Gray Herbarium of Harvard 
University, who has given most valuable advice and has 
revised the manuscript of the keys and flora, thus contribut- 
ing greatly to any value which they may be found to possess. 
Much aid has been derived from the careful proof-reading 
of Professor J. M. Holzinger of the Minnesota State Normal 
School, Professor L. H. Pammel of the Iowa State College, 
and Miss Mary P. Anderson of the Somerville, Mass., English 
High School. The author wishes heartily to thank these 
critics for the many errors which they have corrected and 
the valuable additions which they have suggested. 
The territory covered overlaps that dealt with by Professor 
Tracy in the flora above cited, and nearly meets that embraced 
in Miss Eastwood’s Flora of the Rocky Mountains and the 
Salt Lake Basin, since many of the species treated in the 
present work range west as far as the hundredth meridian. 
The plants chosen to constitute this flora are those which 
bloom during some part of the latter half of the ordinary 
school year, and which have a rather wide territorial range. 
Enough forms have been described to afford ample drill in 
the determination of species. Gray’s Manual of Botany or 
Field, Forest, and Garden Botany will of course be employed 
by the student who wishes to become familiar with most of 
the seed-plants of the region here touched upon. Those 
species which occur in the central and northeastern United 
States only as cultivated plants are so designated. The illus- 
trations are mainly redrawn from German sources. A few 
of them are the work of Mr. E. N. Fischer of Boston, but 
the greater portion are by Dr. J. W. Folsom of the University 
of Illinois. 
Jd. Xeni 
CamBripceE, Mass., January, 1901. 
