iv PREFACE. 



systems, rather than by the artificial method of Linnaeus. 

 To those who cuhivatc botany extensively as a science, there 

 can be no question that the natural method is far more exact 

 and satisfactory. On the other hand, to beginners in study, 

 the artificial mode is more easy of comprehension, and is 

 more readily made available for the first steps in the identi- 

 fication of plants. 



As the present is not a new work, but an enlarged edition 

 of one commonly used in this vicinity for the last twenty 

 years, it has not been thought expedient to make many al- 

 terations, either in the nomenclature or arrangement of its 

 contents. Veiy few of the names have been altered, that 

 confusion in reference might be avoided. A considerable 

 number of additions will be found in the pages of this edi- 

 tion, consisting of plants noticed in this vicinity since the 

 former editions, or communicated by the kindness of various 

 botanical friends, whose names will be found in their re- 

 spective places. The Glossary of botanical terms at the 

 end is much enlarged. 



To the cultivators of American botany on a more exten- 

 sive scale, I take the liberty of recommending the Flora of 

 North America now in course of publication by Drs. Torrey 

 and Gray of New York, a work which does justice to the 

 great learning and extensive opportunities of its authors ; 

 also to the Flora Boreali-Americana of Sir W. J, Hooker, a 

 most important work on the plants of Northern and North- 

 western America. 



Boston, May, 1840. 



