Rare floristic records in the Nizhny Novgorod part of the Oka river catchment

Long-term studies of the Oka river basin have had little impact on the Eastern part of the basin, which was studied in 2019. The surroundings of a number of localities in the Ardatovsky, Vachsky, Kulebaksky, Navashinsky and Sosnovsky districts of the Nizhny Novgorod region were examined. As a result, many interesting floristic data were found. The article provides information about 25 rare species of vascular plants. New locations were identified for 9 species listed in the regional Red book, some species are located on the border of the range.