lyme grass

from WordNet (r) 3.0 (2006)
lyme grass
    n 1: a grass of the genus Elymus
    
from The Collaborative International Dictionary of English v.0.48
Lyme grass \Lyme" grass`\n. (Bot.)
   A coarse perennial grass of several species of {Elymus}, esp.
   {Elymus Canadensis}, and the European {Elymus arenarius}.
   [1913 Webster]
    

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