104 FAMILIAR LESSONS IK BOTANY. 



This last class, the eleventh, has twenty or more stamens 

 inserted on the calyx. 



Twelfth class, polyandria, has twenty or more inserted 

 on the receptacle. 



The orders of the first twelve classes depend on the num- 

 ber of pistils, and are named by prefixing the Greek numer- 

 als to the word gynia : 



1. Monogynia. 7. Heptagynia. 



2. Diagynia. 8. Octogynia. 



3. Triagynia. 9. Enneagynia. 



4. Tetragynia. 10. Decagynia. 



6. Pentagynia. 11. Dodecagynia. 



6. Hexagynia, 12. Polygynia. 



When the filaments are united, making a little tube in 

 which the pistil stands, we call it monadelphia (from 

 mojiosy alone, and adelplios^ brother) : this makes the 

 fifteenth class. Sixteenth class, diadelphia (dis, two, adel- 

 phoSy brother), has stamens united by their filaments, form- 

 ing two sets. In these classes the orders depend upon the 

 number of pistils, and are named in the first twelve classes 

 only, adding ffi/7iia (pistil), monogynia, diagynia, etc. 



Seventeenth class have their anthers united, and hence 

 are called syngenesia, which means growing together 

 (flowers compound). This class has these orders : 



1st. EqualiSy flowers perfect; that is, each flower hav- 

 ing a stamen, pistil, and seed. 



2d. SujMrflua, disk florets perfect, ray florets contain- 

 ing neither stamens nor pistils. 



3d. Necessaria, florets of the disk, staminate ; rays, pis- 

 tillate. 



4th. Segregata, florets each furnished with a perianth 

 or calyx. 



The eighteenth class, gynaiidria, stamens growing on 

 the pistil. 



