Distribution of Cephalophilon nepalense (Polygonaceae) and Rorippa sylvestris (Brassicaceae) in agrocenoses of the south of the Primorsky Territory

Information is provided on the weeds of the Buckwheat (Polygonaceae Juss.) and Cabbage (Brassicaceae Burnett) families – persicaria nepalensis (Cephalophilon nepalense (Meissn.) Tzvel.) and yellow field cress (Rorippa sylvestris (L.) Bess.). The purpose of the study is to summarize modern data on the distribution of the indicated plant species in the agrocenoses of the Primorsky Teritory. Field research was conducted between 2018 and 2024 in urban and rural settlements. A route survey method was used, and literature and online information were analyzed. The analysis of herbarium specimens of C. nepalense and R. sylvestris (VLA, VBGI, MW, MHA, LE) collected in the Russian Far East was carried out. Phenological observations were carried out, herbarium material was collected and identified, and objects from the vegetation areas were photographed. Herbarium specimens were transferred to the regional funds: the Federal Scientific Center of the East Asia Terrestrial Biodiversity of the Far Eastern Branch of the Russian Academy of Sciences (VLA), and the Botanical Garden-Institute of the Far Eastern Branch of the Russian Academy of Sciences (VBGI). According to the data obtained, C. nepalense and R. sylvestris have now firmly entered the group of weeds and have populated agrocenoses in the south of the Primorsky Territory, including vegetable gardens. C. nepalense, along with several other plants in the Polygonaceae family, is found in most administrative districts of the region and is actively spreading through anthropogenically transformed areas. We propose adding this species to the list of weeds of the Primorsky Territory. R. sylvestris has become a common species in private garden plots.

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