4 PREFACE. 



The arrangement and the nomenclature of this Catalogue 

 are those of Gray's Manual of the Botany of the Northern 

 United States, Sixth edition, 1890 the book most readily 

 accessible to all persons interested in the study of our local 

 flora. In the present state of botanical nomenclature, and for 

 the purpose for which this Catalogue is intended, I have not 

 thought it wise or necessary to adopt proposed changes not 

 yet generally accepted. The student interested in such mat- 

 ters can easily adapt himself to changing conditions. 



Introduced species, so far as I have been able to determine 

 the fact of introduction, are indicated by a *. 



