10 



four Stamina, two of which are long and two short'; 

 and the second has six Stamina, of which four are 

 long and two short. 



Class XVI. XVII. XVIII. depend upon the Sta- 

 mina being more or less united, as in class sixteen all 

 the Stamina are united together in one sheath ; in class 

 seventeen the Stamina are divided into two quantities j 

 and., in class eighteen, into more than two. 



Class XIX. has the upper part of the Stamina, 

 usually the Antherae, united into a tube, and the lower 

 part or filaments separate. 



Class XX. has the Stamina situated on the Pistil- 

 lum. These seven classes are illustrated by plates pre- 

 fixed to each class respectively. 



Class XXI. comprehends those plants where the 

 Stamina grow in separate flowers from those that pro- 

 duce the seed, yet both sorts of flowers growing at 

 the same time on the same plant, as in the Cu- 

 cumber. 



Class XXII. includes those plants where the flowers 

 that bear the Stamina grow on separate plants from 

 those that produce the seed, as in the date-bearing 

 Palm already mentioned. 



Class XXIII. comprehends those plants the Sta- 

 mina of which grow sometimes on separate plants, 

 sometimes in separate flowers in the same plant, and 

 sometimes in the same flower with the Pistilla. 



Class XXIV. includes Ferns, Mosses, Liverworts, 

 Flags, and various kinds of sea- weeds and fungi. 



