the Leaves of Cotyledon calycina. | 215 
agrees in habit and generic characters ; the only difference being 
in the number of the parts of fructification, which in Cotyledon 
ealycina are one-fifth less than in the other species of the genus ; 
a difference, however, that according to the principles of the 
Linnean System, does not form a sufficient ground for separa- 
tion. : 
I have the honour to be, &c. 
20th April, 1813, Benyamin HEYNE- 
XVII, De- 
