Hydrocharitetum dubiae—New Association of Aquatic Vegetation of Lemnetea Class in East Part of Asia

In the due course of the project Classification of Vegetation of the Russian Federation, a revision of the current diversity of Russia’s vegetation, including aquatic, is being carried out. It turned out that the types of some plant communities noted on the territory of the country have not yet been described, as well as the association with the dominance of Hydrocharis dubia. Based on the eleven complete geobotanical relevés from Russia and China, this paper describes a new association Hydrocharitetum dubiae ass. nov., attributed to the new alliance Hydrocharition dubiae all. nov. in the class Lemnetea O. de Bolòs et Masclans 1955. Hydrocharis dubia forms communities in the south of the Russian Far East (where it occurs at the northern border of the range) and in many subboreal-tropical regions of East and Southeast Asia.