Ray grass

from The Collaborative International Dictionary of English v.0.48

Ray grass \Ray" grass`\ (r[=a]" gr[.a]s`). [Etymol. of ray is
   uncertain.] (Bot.)
   A perennial European grass ({Lolium perenne}); -- called also
   {rye grass}, and {red darnel}. See {Darnel}, and {Grass}.
   [1913 Webster]

   {Italian ray grass} or {Italian rye grass}. See {Darnel}, and
      {Grass}.
      [1913 Webster]