Rare species of bayrachny forests of the south of the European part of Russia

The article presents the results of long-term research ravine oak forests Rostov region.The term ‘bayrack’ (ravine) forest is associated with growing this type on slopes ravines in forest-steppe zone. conducted ecological and floral classification showed a high syntaxonomic diversity region. Forest communities are represented by 6 associations: Scorzonero ensifoliae–Quercetum Sokolova ex Semenishchenkov 2020; Vicio pisiformis–Quercetum roboris 2012; Pyro pyrastri– Quercetum Poluyanov Chamaecytiso ruthenici–Quercetum Fritillario ruthenici-Quercetum Onyschenko, Dyakova et Karpenko Goncharenko al. 2020, Melico pictae-Ulmetum minoris ass. nov. prov. from 2 classes: Carpino–Fagetea, Quercetea pubescentis unions: Aceri campestris-Quercion Scutellario altissimae-Quercion . There 67 rare plant species listed Red Books [1], Volgograd [2] Voronezh [3] regions these associations. Oak south European part Russia significantly increase biological not only Don region, but also entire steppe zone country.