This edition is a lecture course prepared for students of biological specialties. In it from ecological and hydrobiological positions questions of classification and the description of coastal-water plants in reservoirs, methods of gathering, mapping, definition of biomass and production of plants are considered. The trophic and ecological role of plants in the system of water biocoenosis is considered. The special attention is given to a role of coastal-water plants in self-cleaning of reservoirs, an estimation of degree of pollution of waters on indicator plants, protection and rational use...