Bui. 25, Div. of Agrostology, U. S. Dep1. of Agnculture. 



Plate XXVII!. 



Fig. 1.— Sand Dune on the Pacific Coast. Sand Rye Grass i'Elymus arenarius) 



COVERING THE TOP OF THE DUNE AND BiG HEAD SEDGE IN THE FOREGROUND. 



Fig. 2.— Sand Dune held by Seaside Blue Grass < Poa macranthai, near 



Seaside, Oregon. 



From a photograph by F. Lamson-Scribncr, l,s'.)9. 



