PREFACE. 



learner not only to behold at one view the 

 various genera comprehended under each 

 clafs, but alfo to diftinguilh readily their 

 differences, and to difcover fome few fpe- 

 cies of plants, which would feem to the 

 'Tyro improperly clafs'd, and might other- 

 wife baffle his refearches in inveftigating 

 their names. Thefe irregular fpecies are 

 therefore, to facilitate his enquiries, printed 

 in italics, and placed at the foot of the or^ 

 der to which they might feem to belong. 



Again, at the head of every genus its ge- 

 neric characters are exprefs'd more fully, in 

 conformity to the method of the foremen- 

 tioned Siijedifi naturalift, with references to 

 Iiis Genera Vlantariiniy where thofe charadlers 

 are defcribed at large. 



Under each genus are arranged the feveral 



fpecies, with their trivial names and fpecific 



differences, all taken from the fame author, 



unlefs where new fpecies required new 



names to be given them. 



Then follow references to thofe authors 

 who have exhibited the heft figures of the 

 Several fpecies. The books referred to are 



ofter^ 



