, ORDERS. 305 



The Orders of the twentieth, twenty-first and 

 twenty-second Classes are distinguished by the charac- 

 ters of some of the Classes themselves which precede 

 them, that is, almost entirely by the number of their 

 Stamens ; for the union of the anthers in some of them 

 is, for the reasons just given, of no moment. 



The Orders of the twenty-third Class, Poly gamut, 

 are, according to the beautiful uniformity of plan which 

 runs through this ingenious system, distinguished upon 

 the principles of the Classes immediately preceding. 



1 . MONOECIA 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 twenty-fourth Class, Crypt oga- 

 mia, are professedly natural. They are four in Lin- 

 naeus, but we now reckon five. 



1. FILTCES. 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. 102. 



