The Collaborative International Dictionary of English v.0.48:
Leymus \Leymus\ prop. n. A genus that in some classifications overlaps the genus Elymus. Syn: genus Leymus. [WordNet 1.5]WordNet (r) 3.0 (2006):
Leymus n 1: genus that in some classifications overlaps the genus Elymus [syn: Leymus, genus Leymus]