THE ESSENTIAL ORGANS OF PLANTS. 83 



SHAPE OF ANTHER-LOBES. 



FIG. 225. 



Kidney-shaped 



Anther. 



FIG. 227. 

 Sinuous Anthers. 



FIG. 224. 

 Oblong Anthers. 



FIG. 223. 



Arro w-sh aped 



Anther. 



FIG. 226. 

 Emarginate Anthers. 



Find upon the charts one-celled anthers, two-celled 

 anthers, four-celled anthers. 



EXERCISE XXXII. 

 Dehiscence of the Anther. 



VERTICAL OR LONGITUDINAL DEHISCENCE. When 

 the anther opens by a slit along its length to emit the pol- 

 len (Fig. 228). 



TRANSVERSE. When the line of dehiscence is across 

 the anther (Fig. 229). 



POROUS. When the anthers emit the pollen through 

 little pores (Fig. 230). 



VALVULAR. When a portion of the anther is lifted up 

 to emit the pollen (Figs. 231 and 232). 



What modes of dehiscence of anther-cells are shown 

 upon the charts? In describing the stamens, name the 

 kind of dehiscence the anther exhibits. 



