The current circumscription of Sorbus subdanubialis includes several taxa. By lectotypification this name is applied to a species that is restricted to the Gömör-Torna Karst in southeastern Slovakia and adjacent Hungary. A new description and revised distribution map of S. subdanubialis are presented. Using flow cytometry analysis it is recognised as triploid. Other populations from the Buda and Pilis Mts., the western Balaton Uplands and Keszthely Mts., previously assigned to S. subdanubialis, turned out to represent two undescribed triploid and presumably apomictic species, endemic to Hungary. The former records of S. subdanubialis from the Vértes Mts. belong mostly to S. pannonica and S. ulmifolia, both endemic to western Hungary. A morphometric analysis of leaf characters demonstrated that the leaf dentation and leaf dimensions are most important in distinguishing between S. subdanubialis, S. danubialis and two undescribed species (to be described later), whereas the leaf shape (apex and base) has an important but secondary role in discriminating among these taxa.
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Vol. 53 • No. 5–6