Notes on the taxonomy of Nymphaeaceae and Menyanthaceae in Mongolia

In this study, we investigated four aquatic plants, namely Nuphar pumila (Timm) DC. and Nymphaea candida C.Presl in Nympaeaceae as well as Menyanthes trifoliata L. and Nymphoides peltata (S.G. Gmel.) Kuntze in Menyanthaceae from Mongolia based on field surveys, herbariums, and scientific literature. In addition, we carefully examined for Nymphaea tetragona Georgi, which was previously recorded in several lakes, Khar-Us, Khar, Buuntsagaan, and Tsetsegt as well as the Ider river in Mongolia. Because we did not find N. tetragona in the field and because it is difficult to identify from herbarium specimens, we believe it has been misidentified at the Khar-Us, Khar, and Tsetsegt lakes to date. More surveys are needed to document its presence. Finally, we provide detailed distribution maps, photo illustrations, and taxonomic notes of four species.