The aim of this study was to extend the knowledge on the floristic diversity, vegetation, ecology and threats of habitat 2340 *Pannonic inland dunes in Bulgaria. Fieldwork was conducted in 2018 and data were sampled at 35 phytosociological plots from 5 localities along the Danube in NW Bulgaria. A complete list of vascular plants and bryophytes, percentage cover of each vascular plant species, total vegetation cover and separately cover of bryophytes, herbs, litter and bare soil were recorded within each plot, and a soil sample was also collected. A total number of 132 vascular plants and 7 bryophytes were registered. Each vascular plant was assigned to one of two groups: (1) typical plants - 39 species, and (2)non-typical plants - 93 species. The total vegetation cover in the releves was generally high, and the share of typical and non-typical plants was quite similar. Values for species richness ranged between studied localities from 17 to 23 species per plot, for total vegetation cover - between 69% and 84%, and for cover of bryophytes - between 1 and 7%. The association Bassio laniflorae-Brometum tectorum was reported for the first time for Bulgaria and it was presented in all localities. The substantial presence of non-typical plants registered in this study revealed a successional trend towards ruderalization, which has significantly affected the autochthonous flora and vegetation of inland dunes in Bulgaria. We believe that results from our study will be useful in order to reveal the current diversity, distribution and conservation status of European inland dune vegetation.
