STUDY ON SOME AREAS OF RARE PLANTS SPECIES FROM THE MIDDLE SECTOR OF NISTRU RIVER BASIN (THE REPUBLIC OF MOLDOVA)

The study included researches in the natural areas protected by state, during 2010-2013, in the middle of the Nistru River basin, located on the border with Ukraine, in order to delimit the habitats of rare plants species, with national and international protection status, in the existing areas across Europe and identify new habitats (in the study area) for the most threatened species of flora in the region. Physical and geographical particularities of the surveyed region have conditioned a varied floristic diversity, which included and species found on the limit of their area of distribution. Thus, some plants are at North limit (Galanthus nivalis, Trifolium pannonicum), at South limit (Hepatica nobilis, Poa versicolor, Dryopteris carthusiana) and at East limit of distribution (Doronicum hungaricum, Melittis sarmatica) in the Republic of Moldova, other threatened species ? at limit in Ukraine (Lilium martagon, Allium rotundum, Lathyrus venetus, Cephalanthera damasonium) or in Romania (Pulsatilla grandis, Veratrum nigrum, Staphylea pinnata). These species are listed in different Annexes of Environmental Conventions (Bern, 1979, Washington, 1973, Appendix IUCN, 2008, Red Book of neighboring countries) and require additional measures for improving and preserving habitats.