Limestone quarry biodiversity assessment has demonstrated that the removal of biotic components from the site, by stripping and excavation works, and the increased degree of pollution leads to the fragmentation of the natural habitats, depreciation of species, perturbation of fragile plant groups, reduction of biological productivity. The impact of limestone quarry exploitation on vegetal biodiversity is manifested through the presence of a small number of species (101), compared to the vegetal diversity of unused limestone ecosystems where about 310 species grow. The basic floral background of the limestone quarry ecosystem on the restored dumps, especially those aged 20 to 25 years, is formed by the invasive species of Elaeagnus argentea Pursh. Herbaceous plants that have an invasive character Grindelia squarrosa (Pursh.) and Erigeron annuus (L.) Pers. They have an important role in the formation of the vegetal carpet and are species that are among the first to populate these habitats being scattered by diverse factors: wind, water, birds and the trucks crossing the quarry. Most species of herbaceous plants pass through a period of adaptation to the ecosystem of the exploited quarry, where some can easily withstand this period, for example: the Melilotus officinalis (L.) Pall., the Melilotus albus Medik., the Coronilla varia L., the Lotus corniculatus L., which belonging to the fabaceae family plants acquire their nitrogen source in the sub-layer through nitrogen fixing bacteria in the root nodules. The richest in species are the plateaus of an older age since the moment of scraping storage (the ones of 20 and 25 years old). Thus, the plateaus aged 25 are characterized by a floral diversity of maximum 63 species, while on the dumps aged 20 - 52 species are found. On the investigated sites, the following species were identified: a species of forest fruit plant, a species of fruit plant, two vegetable species, a condimental species, two species of aromatic oil plants, two species of plants containing tannin, two species of toxic plants, 5 species of forage plants, 15 species of medicinal plants and 2 species of insecticidal plants. Species of rare and endangered plants were not found on the investigated sites, but their penetration into the exploited limestone ecosystem is probable because these species are present in the adjacent ecosystems.