Rare Plants of Floral Complexes of the Vetlyanka River

—The floristic complexes of the Vetlyanka River are characterized by a high pool of rare plants with various protection categories in the Saratov region. In total, the complexes include six species: Bulbocodium versicolor, Hyacinthella leucophaea, Tulipa gesneriana, Iris pumila, I. halophila , and Scilla siberica. These ecotopes have been recorded for the first time for S. siberica , B. versicolor , and Iris halophila. At the same time, S. siberica and I. halophila have a narrow ecological range. The studied cenopopulations of rare plants in the floristic complexes of the Vetlyanka River are stable in time and space. There is a self-renewal process in cenopopulations of the studied plants, which is hampered by a number of anthropogenic factors. The ontogenetic spectrum of the B. versicolor cenopopulation is a single-vertex spectrum with a high proportion of individuals of the generative fraction (70.2%). The age spectrum of the S. siberica cenopopulation is dominated by pregenerative plants (67.4% of the total number of the individuals studied) with the maximum number recorded for immature individuals (46.5%). The high proportion of pregenerative plants (52.5%) in the T. gesneriana cenopopulation indicates its capability for self-renewal and is characterized by a bimodal age spectrum. According to the classification by T.A. Rabotnov, the cenopopulations of the studied species are normal incomplete.