24 Ipostelsia 



could be enumerated for this type of beach. It 

 is however representative and will serve to give 

 an idea of the composition of the society. 



The interdependence and adjustments of 

 individuals to each other in an association is 

 shown by such |)lants as Alsiiic brachypetala and 

 Galium vaiUiUilii which, though largely shaded 

 by the taller weeds and grasses, grow profusely, 

 their weak stems finding ready support upon 

 the rank growth about them. 



b. Vegetation of rocky beaches. 



1 . Rock beach formation. 

 a. Exposed rocky beach. 



By exposed rocky Ijcaches are meant those 

 that by their ]jroximity to the water are some- 

 times subjected to the dashing ocean spray and 

 occasionally to intermittent inundation by high 

 waves. They lie exposed to the light and re- 

 ceive the full force of the wind currents. 



Upon this unpromising rock substratum 

 where hardly any soil finds lodgement are estab- 

 lished a group of hardy xerophytes. Plants of 



