The geological-forest reserve “Jeziorko Daisy” lake protects limestone outcrop with Upper Devonian fossilised fauna and a narrow belt of surrounding forests. Vascular plant flora comprises 198 species with 128 forest species, 53 apophytes of grasslands and anthropogenic non-forest communities, and 17 anthropophytes. 13 species are protected by low, and 2 of them (Cephalanthera longifolia, C. damasonium) are threatened in Poland. The studied area was deforested in 19th century, and now it is covered by cultivated forests and different stages of regeneration of natural vegetation. Two non-forest communities of Artemisietea and Trifolio-Geranietea classes and three forest communities of Querco-Fagetea class have been identified.