20 PUAGTICAL BOTANY. 



{Number of stamens in eaxHi flower) Class. 



1 I. MONANDEIA. 



2 II. DiANDRIA. 



3 III. Triandeia. 



4 I Y. Tetrandria. 



5 Y. Pentandria. 



6 YI. Hexandria. 



7 YII. Heptandria. 



8 YIII. OCTANDRIA. 



9 IX. Enneandria. 



10 X. Decandria. 



11-19 XI. Dodecandria. 



\ on the calyx... XII. Icosandria. 

 20, or more > on tlie recep- 



) tacle XIII. POLTANDRIA. 



*** Of nneqiml length, if 4 



or G — namely, if 4 : 2 



Ion o:er and 2 shorter XIY. Didynamia. 



if 6 : 4 longer and 2 shorter XY. Tetr adynamia. 

 ** United with one another, 

 «;, by their filaments : 



f into 1 set or tube XYI. Monadelphia. 



f f into 2 sets or bundles XYII. Diadelpiiia. 



ft t into 3 or more sets X YIII. Polyadelphta. 



Z», by their anthers into a ring. XIX. Syngenesia. 

 * United with the pistils XX. Gynandria. 



B, Stamens and pistils in separate flowers : 

 «;, of the same individuals. . . XXI. Moncecia. 

 Z*, of different individuals... XXII. Dicecia. 

 c, some flowers perfect, oth- 

 ers staminate or pistillate 

 — in the same or in dif- 

 ferent individuals XXIIL Polygamia. 



