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The taxonomical status of the species Quercus virgiliana Ten. and Quercus pubescens Willd. was interpreted differently in time. Given the clear morphological characters that differentiate the two taxa, namely achene morphology, scales at the base of the cup and leaf morphology, as well as the specific ecological conditions and distribution area, we consider their treating as valid species to be justified. The syntaxonomical revision of these forests was done using both literature data and field research. In Transylvania, the first species, Quercus virgiliana, was reported from only a few locations. Based on our research in the Natura 2000 Site from Petiş, we have described a new association with this species: Carici montanae-Quercetum virgilianae. Since the phytocoenoses with Quercus virgiliana from Southern Romania, namely from Dobruja and the Southern Mehedinţi plateau, have a floristic structure that is richer in thermophilous species and distinctive ecology, we have assigned them to the association Carpino orientalis-Quercetum virgilianae. The tree layer is dominated by Quercus virgiliana and Quercus pubescens. By analyzing the Romanian phytocoenoses which include the second species, Quercus pedunculiflora, we have concluded that they can be classified in two associations. The first one, Tilio tomentosae – Quercetum pedunculiflorae comprises the stands from plateaus and moderate slopes in Dobruja and Moldavia. The tree layer is dominated by the species Quercus pedunculiflora and Tilia tomentosa. The second association, Fraxino pallisae-Quercetum pedunculiflorae is specific to the meadows of Bârlad, Siret, Prut and Buzău rivers. The tree layer is dominated by Quercus pedunculiflora, Fraxinus pallisae and Fraxinus angustifolia.