Summary of aquatic and coastal aquatic flora of the Klyazma Federal Reserve

A comprehensive inventory of the aquatic and riparian vascular flora of the Klyazma Nature Reserve has been compiled based on historical data (1939–2010) and recent field investigations conducted in 2024. The checklist includes 142 species and 1 hybrid of aquatic and semi-aquatic plants, representing 37 families. The floristic composition of aquatic and semi-aquatic vegetation was documented across nine lakes and one river located within the boundaries of the Reserve in the Ivanovo and Vladimir regions. 9 species and 1 hybrid are newly recorded for the area: Equisetum palustre, Salvinia natans, Wolffia arrhiza, Juncus ambiguus, Leersia oryzoides, Epilobium hirsutum, Callitriche palustris, Potamogeton × ripensis (P. compressus × P. trichoides), and Riccia fluitans. New localities were identified for five regionally rare species listed in the Red Books of the Ivanovo and Vladimir regions: Utricularia minor, Scutellaria hastifolia, Nymphaea candida, Potamogeton praelongus, and Salvinia natans. Previously recorded rare species Elatine alsinastrum and Najas minor were not found during the 2024 survey. Cluster analysis of the studied water bodies revealed 3 distinct groups based on floristic similarity, which reflect differences in ecological conditions and the degree of anthropogenic impact.