Floristic survey of the protected area «Broadleaf forest in the Osetr river of bend» (Moscow region)

The protected area «Broadleaf forest in the Osetr river of bend» was organized in 2017 in the municipal district of Zaraysk, Moscow region. In the course of field research in the Stropnenskaya Luka tract in 1989 and 2024, a floristic study of an area of 167 hectares was carried out and 311 species of vascular plants were noted. Monitoring the condition of rare species, accounting and tracking of alien plants are of great environmental importance. 3 rare plant species of the "Red Data Book of the Moscow region" (2018) have been identified: Corydalis marschalliana (Pall. ex Willd.) Pers., Rosa villosa L. and Scrophularia umbrosa Dumort. According to literary data and herbarium materials, four more rare species are listed for this region: Dentaria quinquifolia Bieb., Gentiana cruciata L., Nepeta pannonica L., Omphalodes scorpioides (Haenke) Schrank, which we did not find. Among the representatives of alien flora, 10 species were identified as invasive in the «Black Book of Flora of Middle Russia» (2010). Among them, the most widespread is Acer negundo L., which has inhabited the floodplain areas of the Osetr River. Heracleum sosnowskyi Manden. poses a potential threat, since it has already reached the floodplain areas and forest edges bordering the specially protected natural areas.