CAEEX. 



269 



rottindus contain an aromatic oil ; those of C. longus are tonic and 

 astringent. 



The Mat-grasses, growing on sandy shores and dikes, securing them 

 against the incursions of the sea or the drifting winds, include some 

 species of Carex, as C. arendria, C. fcena, C. ripdria, etc. The roots 

 of C. arendria are used as a substitute for Sarsaparilla. 



