As a result of our study on the genus Bromus, B. rigidus and B. sewerzowii are reported as new records for the flora of Iran. Bromus diandrus-rigidus complex comprises a group of species ranging from tetra- to octaploid levels,which have been treated in different ways. Based on a specimen from Golestan National Park, B. rigidus is reported along with its illustration and a comparison with its closely related taxa. Furthermore, B. sewerzowii is the second record that is based on a specimen from North Khorasan (Sarakhs). In addition, a taxonomic key to two the species and their allies has been presented.