Bromus sect. Triniusa is revised in Khorassan based on the new taxonomic concepts of Bromus danthoniae complex group and a remarkable herbarium material collected from Khorassan (Kopetdagh, northeastern Iran), as the main center of its diversity. Bromus turcomanicus, a narrow endemic species in central Kopetdagh hitherto known only from the type locality in southern Turkmenistan, is newly recorded for the flora of Iran. The presence of Bromus pseudodanthoniae, a neglected species in Flora Iranica, is confirmed. An identification key and additional note on taxonomy and biogeography of three-awned Bromus species is presented.

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