Astragalus sertavulensisis described as a new species from Karaman in south Anatolia, Turkey. The new species is closely related to A. mesogitanus Boiss. & Balansa andA. lycaonicus Hub.-Mor. & Reese and is one of only three species in the section that have a hairy corolla. However, while only the standard is hairy inA. mesogitanus, and all the corolla parts are hairy inA. lycaonicus, only the standard and keel are hairy inA. sertavulensis. Furthermore,A. sertavulensisis the only member of the section where the stipules are close to the internodes, at least at the base. A taxonomic description as well as pollen and other morphological characters of the new species were presented. In addition, the geographical distribution ofA. sertavulensis, A. mesogitanus and A. lycaonicusis mapped.