PREFACE. 
iv 
they may obtain from good books, when become 
attainable.* 
The Genera plantarum secundum ordines natu- 
rales, §c. of Mr. de Jussieu, is an indispensable 
work; tlie Tableau du Regne vegetal, by Yentenat; 
les Families des Plantes of Mr. Jaume St. Hilaire, 
are the best elementary books which till late bad 
appeared on this subject. 
* A great number of these American genera are not found in 
the work of Mr. de Jussieu; but they have been according to his 
principles reduced with accuracy to the respective families to which 
they belong in his system. They have been alphabetically arranged 
in each family, in order to facilitate the use of this catalogue. 
