CAREX. 



269 



roMmdus 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 G. arendria, G. fcenea^C. ripdria, etc. The roots 

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



