132 
Michaux never visited Louisiana, and has very few 
plants from the shores of the Mississippi. 
Pursh never went there ; but received some com¬ 
munications from Enslen, who had visited that State. 
Muhlenberg has enumerated in his Catalogue of the 
plants of North America, many sfent him from the shores 
of the Mississippi and Washita, by Dunbar, Moore, &c. 
some of which are even new ; but he has not de¬ 
scribed them. 
This addition will not be very considerable, yet it 
may be considered as another step towards the know¬ 
ledge of the vegetation west of the Mississippi. About 
120 species, whereof several appear to be new, are 
here added, making a total of 525 species, hitherto 
known as natives of the State of Louisiana. 
This Supplement shall be classed according to the 
improved natural method, already published in my Ana¬ 
lysis of Nature, in 1815. The Flora of Robin was 
the first work ever published on American plants, 
according to the natural method of Jussieu, though 
with all its defects and without corrections. This 
shall be the first attempt on its improved plan : the 
natural classes only will be given here, since the small 
number of plants to be enumerated requires no further 
extension of the method. Its full application and the 
characters of the natural orders and families, will soon 
appear in my Flora Missurica , or Flora of the regions 
west of the Mississippi, and in the natural classifica’ 
tion of all European and American genera, two works 
which may speedily Follow this. 
