Summary:

The Malopolska Upland beside the Lubelska Upland is the region of Poland where the greatest number of xerothermic habitats occur. During the 2007 vegetation period, phenological investigations were conducted on the southern slope of Lisiniec hill in the Miechów town vicinity. The investigations focused on the occurrence spectra of development stages of selected xerothermic plants with particular regard to the flowering stage. The observations covered the following species: Adonis vernalis, Agrimonia eupatoria, Anemone silvestris, Anthemis tinctoria, Aster amellus, Brachypodium pinnatum, Campanula sibirica, Centaurea scabiosa, Centaurea stoebe, Cirsium pannonicum, Coronilla varia, Cypripedium calceolus, Galium verum, Inula ensifolia, Linum flavum, Linum hir-sutum, Medicago falcata, Orchis pallens, Peucedanum oeroselinum, Salvia prat-ensis, Sanguisorba minor and Stachys recta. The state of their development stages was described and compared with the data given in the botanical key “Polish Plants” [Szafer et al. 1967]. On the basis of conducted investigations it was found that flowering of almost all analysed plant species began later and ended earlier than stated by Szafer et al. [1967]. Delay of flowering and acceleration of flowering cessation was most probably caused by strong spring drought and vegetation period not much abundant in rainfall. Further research is necessary for better identification of phenological flowering stages of xerothermic plants and their dependencies on meteorological phenomena, particularly rainfall and habitat moistening.