320 



PLANT STRUCTURES 



drought conditions numerous adaptations have been de- 

 veloped and are very characteristic of xerophytic plants. 

 Some of the conspicuous adaptations are as follows : peri- 



odic reduction of surface, annuals bridging over a period 

 of drought in the form of seeds, geophilous plants also dis- 

 appearing from the surface and persisting in subterranean 



