资料来源 : Webster's Revised Unabridged Dictionary (1913)

Lyme grass \Lyme" grass`\ (Bot.)
   A coarse perennial grass of several species of {Elymus}, esp.
   {E. Canadensis}, and the European {E. arenarius}.

资料来源 : WordNet®

lyme grass
     n : a grass of the genus Elymus