76 THE SECOND BOOK OF BOTANY. 



Look over the charts for examples of extrorse and 

 introrse anthers. In future observe the stamens of 

 living^ flowers with reference to this feature. 



EXERCISE XXII. 

 Attachment of Filament to Anther. 



FIG. 111. FIG. 112. 



Innate. Innate. 



INNATE. Anthers are innate, or fosifi&ed, when 

 the filament runs directly into the base of the con- 

 nective (Figs. Ill, 112, and 116). 



ADNATE. Anthers are adnate, or dorsifixed, when 

 the filament runs up the back of the anther, joining 

 the connective in such a way that the anther is hung 

 in front of it (Figs. 113 and 114). 



VERSATILE. If the filament is attached by a slen- 

 der apex to the middle of the anther, the ends of 

 which swing freely up and down, the attachment is 

 said to be versatile (Fig. 115). 



