ARTIFICIAL SYSTEM, SOMEWHAT REFORMED. 45 



The two Orders of the 15th Class are distin- 

 guished by the shape of their Pericarp. 



1. Siliculosa. Fruit a Silicula, or Pouch (61 :2). 

 fig. 24. 



2. Siliquosa. Fruit a Siliqua, or elongated Pod. 

 (61 : 2). fig. 30. 



The various Orders of the 16th, 17th, and 18th 

 Classes are characterized by the number of the Sta- 

 mens, the Classes themselves being marked by their 

 various modes of union. These Orders therefore 

 bear the same appellations as the first 13 Classes. 



The Orders of the 19th, or Compound-flowered, 

 Class are marked by the Perfect, Separated, Barren, 

 Fertile, or Abortive nature (65) of the Florets (68). 



1. Polygamia-^equalis. Florets all perfect, each 

 having efficient Stamens and Pistil, and pro- 

 ducing one Seed. fig. 57-63. 



2. Polygamia-superflua. Florets of the disk 

 perfect; those of the circumference, or radius, 

 having a Pistil only : but both kinds forming 

 perfect Seed. fig. 66-69. 



3. Polygamia-frustranea. Florets of the disk 

 perfect; those of the circumference with an 

 abortive Pistil, or none at all. fig. 64, 65. 



4. Polygamia-necessaria. Florets of the disk 

 with Stamens only ; those of the circumference 

 with each a Pistil only. 



5. Polygamia-segregata. Several Flowers, 

 either simple or compound, but with united An- 



