Onosma aksoyii Aytac & Turkmen sp. nova (Sect. Haplotricha H.Riedl, Boraginaceae) is described and illustrated as a new species. It grows in a Pin us nigra forest on serpentine rocks in Southern Anatolia (Konya province). Diagnostic characters of related species are compared and discussed. The characteristic features of pollen, stomata structure, and hairs were studied using a scanning electron microscope. The distribution map of this new species is presented.