INTRODUC TIO N . 

 To the Fourth and last Part. 



I have already explained that the delay in 

 the completion of this work, was mainly owing 

 to the contemporaneous publication of my 

 Flora Telluria^a, where I inserted the natu- 

 ral classification, main principles of natural 

 Botany, and nearly '2000 newor revised Genera 

 or Species (under 1225 articles) whereof many 

 from North America likewise. I now conclude 

 this work like the Fl. Telluriana in 4 parts, 

 which will include over 1000 new Species with 

 some new Genera, many revised Monographs 

 <Slc ; but yet this is merely one half of what I 

 have ready to publish on our Flora, in order to 

 correct the glaring errors and omissions of our 

 Botanists. 



Whereas Prof. Torrey has been at last indu- 

 ced to undertake a general Flora of North 

 America, a task which 1 had suggested to him 

 many years ago, I shall delay my future addi- 

 tions^ and corrections until after his Flora is 

 published. I call it his Flora, although he hopes 

 that Nuttal and others will help him, because 

 he means to insert in it only what he has seen 

 and ascertained, according to his own notions 

 of Species and Genera, overlooking varieties 

 and deviations of specific or generic Types; an 

 error into which he has fallen in common with 

 several other Botanists, who have reluctantly 

 adopted the natural methods of Botany. — But 

 time wall rectify these absurd and obsolete no- 

 tions, and as we now restore, adopt and value 

 the labors, genera and varieties noticed by the 

 fathers of correct or natural Botany, Adanson, 

 Jussieu, Necker, Richard. Lamark Sec, those of 



