VI 
PREFACE. 
much instruction when his attention was first 
directed to Botanical pursuits. 
To Dr. Lewis de Schweinitz he is indebted 
for notes on many genera and species of our 
plants, for a long and friendly correspondence, 
and for many specimens of plants from North- 
Carolina. 
To Zaccheus Collins, Esq. of Philadelphia, 
he wishes to return his thanks for repeated acts 
of kindness, for many and very beautiful spe- 
cimens of Northern plants which served him as 
standards of comparison, for some rare and in- 
teresting minerals, and for much information on 
subjects connected with his researches. 
To Dr. John Torrey of New- York, he is in- 
debted for many of the plants of New-Jersey 
and New-York, for an opportunity of compar- 
ing many doubtful species, and of ascertaining 
many of the plants of Pursh which were to him 
uncertain or obscure. 
To Mr. Rafinesque of Lexington, Kentucky, 
he is under obligations for many plants of the 
Western States, and for the pleasure of an in- 
teresting correspondence. 
To Dr. Bigelow and Mr. F. Boott of Boston, 
he wishes also to express his obligations for 
many very beautiful specimens of plants from 
the Eastern States. 
To Mr. Nuttall he is also indebted for some 
rare plants from the Arkansaw and Missouri. 
To those who have aided him in collecting 
the plants from which this sketch has been com- 
