Lolium perenne L.  
Family: Poaceae
English rye grass, perennial rye grass
[Lolium perenne var. cristatum L.]
Lolium perenne image
from USDA Plants website  
Lolium perenne image
Kurt Stüber  
Lolium perenne image
Lolium perenne image
Botanical Illustration  
Lolium perenne image
Kurt Stüber