172 BOTANY. 



Class 12. They are adherent to the calyx. 



Class 13. They are not adherent to the calyx. 



The two succeeding classes are founded upon the relative 

 length of the stamens. 



Class 14. Didynamia ; 4 stamens, two of which are longer 

 than the other two. 



Class 15. Tetradynamia ; 6 stamens, four of which are 

 longer than the other two. 



Then come four classes founded upon the connection of 

 the stamens with each other. 



Class 16. Monadelphia; all the filaments united together 

 to form a tube, the anthers themselves remaining free. 



Class 17. Diadelphia ; the filaments united into two sets, 

 anthers free. 



Class 18. Polyadelphia ; the filaments united into more 

 than two sets, anthers free. 



Class 19. Syngenesia ; filaments and anthers united into 

 a tube. 



The succeeding four classes are founded on the relation of 

 the stamens to the pistil. 



Class 20. Gynandria ; stamens adhering to or apparently 

 growing out of the pistil. 



Class 21. Monoecia; stamens and pistils in different 

 flowers, but on the same plant. 



Class 22. Dio3cia ; stamens and pistils in different flowers, 

 and also in different plants. 



Class 23. Polygamia ; stamens and pistils separate in 

 some flowers and united in others, and either all on the same 

 or different plants. 



The last class has no flowers properly so called. 



Class 24. Cryptogamia; no stamens or pistil, or those 

 in which these essential organs cannot be discovered. 





