BOTANY. 



Like the word polyandrous, these terms apply only to 

 distinct stamens ; at the same time they have the impor- 

 tant advantage of giving the precise number. 



But, if a tetrandrous flower has two stamens long and 

 two short (Fig. 157), it is said to be didynamous j and, if 

 an hexandrous flower has four stamens long, and two 

 short (Fig. 158), it is said to be tetradynamous. 



These words, applied to the stamens of a flower, give 

 at the same time their number, the fact that they are dis- 

 tinct, and the proportion of long to short ones. 



Can you find upon the charts any flowers with tetra- 

 dynamous stamens ? Have any of them didynamous sta- 

 mens? 



EXERCISE XXL 

 The Growing together of Stamens. 



Having disposed of all your flowers with distinct sta- 

 mens, next examine those with united stamens. 



First observe whether they have grown together by 

 their filaments, or by their anthers. All 

 those having their anthers united, wheth- 

 er into a tube, around the pistil, or in any 

 other way, may be put together and la- 

 beled syngenesious (Figs. 160 and 161). 



FIG. 159. 

 Syngenesious Stamens. 



FIG. 160. FIG. 161. 



Synganesious Stamens. Syngenesious Stamens. 



