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In this article the collection of specimens related to Onosma sulaimanica from Kordestan Province, Iran, was confirmed and reported for the first time. Therefore, the species is recorded for the flora of Iran. This species is placed in the sect. Onosma, subsect. Onosma, ser. Wheeler-hainesii. A diagnostic key of related taxa belonging to series Wheeler-Hainesii and Aleppica, and the photos, micrographs and a distribution map of the species were also presented.