The check-list of vascular plants of the Penza region within the Oka river basin

The article contains the check-list of vascular plant species in the Oka River basin in the Penza region. In the Penza region, the Oka River basin is a fragment of the Moksha River basin. The Moksha River is a right-bank tributary of the Oka River. We have shown the species distribution in municipal districts of the Penza region. For each species, information is indicated by scores (1, 2, 3, 4, 5). In the Oka River basin within the Penza region, the vascular plant flora consists of 1111 species and hybrids from 88 families. Following districts are richest in species: Kamensky (645 species), Narovchatsky (597 species), Nizhnelomovsky (577 species), Issinsky (551 species). We found the least species diversity in the Vadinsky district, and Zemetchensky district. According to the used assessment of data sources confirming the indications of plant species, the vast majority of indications in districts of the Penza region in the Oka River basin were confirmed by observations of the authors (72.9%).