ORDERS. 401 



The Orders of the 23d Class, Poiygamia, 

 are, according to the beautiful uniformity of 

 plan which runs through this ingenious sy- 

 stem, distinguished upon the principles of the 

 Classes immediately preceding. 



1. Moistoecia has flowers with Stamens and 

 Pistils on the same plant with others that 

 have only Pistils, or only Stamens ; or 

 perhaps all these three kinds of blossoms 

 occur; but whatever the different kinds 

 may be, they are confined to one plant. 



2. Dioecia has the two or three kinds of 

 flowers on two separate plants; 



3. Trioecia has them on three separate 

 plants, of which the Fig is the only real 

 example, and in that the structure of the 

 flowers is alike in all. 



The Orders of the 24th Class, Cryptoga- 

 ?nia, are professedly natural. They are 4 in 

 Linnaeus, but we now reckon 5. 



1. Filices. Ferns, whose fructification is 



obscure, and grows either on the back, 



summit, or near the base of the leaf, 



■thence denominated a frond. See p. 133. 



2 D 



