Hypericum sechmenii Ocak & Koyuncu sp. nova (Hypericaceae) is described and illustrated from the peak of Arayit Mountain in central Anatolia, Turkey. The species grows on limestone rocks in B3 Eskisehir province. It is closely related to H. minutum and H. huber-morathii, the latter an endemic confined to central Anatolia. Diagnostic morphological characters are discussed. The pollen characteristics of three species were examined by SEM.