Abstract:The karyotypes of 5 species of Leymus Hochst.are reported in this paper.The karyotype formulae are as follows: L.racemosus (Lam.) Tzvel.,2n=4x=28=24m(2SAT)+4sm(2SAT); L.crassiusculus L.B.Cai,2n=4x=28=22m(2SAT)+4sm+2st(2SAT); L.ruoqiangensis S