Abstract
Two new species of the genus Sorbus are described from Hungary, illustrations and their distributions are presented. Both belong to nothosubgenus Tormaria (Sorbus latifolia group), putative hybridogenous apomictic species originated from a cross between a member of S. aria group and S. torminalis and occur sympatrically in dolomite slopes of the Bakony Mts (NW Hungary). One of them S. barabitsii is a stenoendemic species to the hill Malom-hegy above villages Márkó and Bánd where it grows in mixed forests of scree rocky slopes (Primulo veris-Tilietum) and in mixed karstic forests (Fago-Ornetum) of the north-facing slopes accompanied by other Sorbus species, such us S. aria, S. danubialis, S. graeca, S. pannonica, S. torminalis, as well as the local endemism S. veszpremensis. Population of the other species S. polgariana occurs in the valley Burok-völgy nearby town Várpalota (Királyszállás), where the majority of the individuals grow in mixed karstic forests (Fago-Ornetum), rocky beech forests (Daphno laureolae-Fagetum) and in the margin of closed thermophilous oak woodlands (Vicio sparsiflorae-Quercetum pubescentis) as well. This species grows sympatrically with Sorbus aria, S. danubialis, S. graeca, S. pannonica, S. redliana and S. torminalis.
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