SECT. I. ORGANOGBAPHY AND GLOSSOLOGY. 55 



stems which throw up stalks and leaves at intervals 



(fig. 47.), as in the Carex arenaria, Elymus arenarius, 

 Sac., plants of inestimable utility in certain regions, 



where they serve to bind the shifting sands of the sea 

 shore, which would otherwise drift before the wind, 

 and form irruptions over the neighbouring land. The 

 common but noxious couch-grass is another familiar ex- 



E 4 



