Abstract:In present paper,the chromosome numbers and karyomorphology of five species in Cycas L.are reported for the first time except for that of C.multipinata.Their karyotypes are formulated followings;C.diannanensis:K(2n)=2x=22=2m+4sm+4st+12T;C.tanqingii:K(2n)=2x=22=2m+8sm+2st+10T;