Studies regarding the flora analysis of the organic farm from Petrova, Maramures County.

In Europe, biodiversity marks a decline caused by intensive systems of agriculture, intensive processing of deforestation or habitat fragmentation through urbanization and infrastructure development. These causes have led to the disappearance from the old continent of 64% of endemic plant species (living only in certain territories). Petrova grassland ecosystem (and also the organic farm where the research took place) is representative for Maramureș Depression being contained in two distinct physical and geographical units. On the one side there is the secondary erosion Petrova Depression from the lower flow of Vișeu and on the other side the highly fragmented hillside of the main interfluve Iza-Vișeu. The floristic inventory of the organic Petrova farm contains 319 units, including 280 species and 39 subspecies. These units belong to 222 genera, being framed in 64 families and 46 orders. The most representative families are Asteraceae 42 units (13.16%), Poaceae 31 units (9.75%), Lamiaceae 25 units (7.84%) and Fabaceae 22 units (6.9%), which show the grassland formations dominance. It has to be mentioned the presence of Lycopodium clavatum fern, threatened species at national and European level, protected by Habitats Directive and Law no. 462/18 July 2001, regarding protected natural areas regime, conservation of natural habitats of wild flora and fauna. Also another 2 units, the orchid Dactylorhiza sambucina and Orchis morio , morio subspecies, are protected through CITES convention and mentioned as rare in the national red lists.