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The Collaborative International Dictionary
Lyme grass

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

Wiktionary
lyme grass

n. (taxlink Leymus arenarius species noshow=1), a coarse perennial grass.

WordNet
lyme grass

n. a grass of the genus Elymus