SORBUS PELSOENSIS (SORBUS SUBGENUS TORMARIA), A NEW SPECIES FROM THE SURROUNDINGS OF LAKE BALATON, HUNGARY

A new triploid Sorbus species, S. pelsoensis is described in Sorbus subgenus Tormaria (Sorbus latifolia group) from Balaton Uplands (Hungary). Illustrations (photographs of the type specimen, leaves, and fruits) and a detailed distribution map are provided as well as photographs of in situ fl owering and fruiting individuals. S. pelsoensis is a stenoendemic species putatively derived from hybridisation between S. torminalis and S. graeca. Th e species is restricted to two neighbouring valleys with about 100 individuals found in thermophilous oak woodlands (Vicio sparsifl oraeQuercetum pubescentis), pubescent oak shrub woodlands (Cotino-Quercetum pubescentis), mixed forests of rocky slopes (Primulo veris-Tilietum platyphyllae), mixed karstic forests (Fago-Ornetum), and at the light-rich margins of these plant communities, respectively