Astragalus issatissensis, a new species of A. sect. Stereothrix (Fabaceae), is described and illustrated from the alpine zone of Shirkuh mountain, Yazd province, in C Iran. It is compared with its presumed closest relative, A. bavanatensis. Furthermore, A. hakkariensis, also in A. sect. Stereothrix, is recorded for the first time from West Azerbaijan province in NW Iran. An updated list of species of A. sect. Stereothrix is presented, distribution maps of all species are given and the distribution patterns in the section are discussed.
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