Plant communities developed on the inundated banks of two reservoirs, the Lake Kamafusa and the Lake Gosho, were studied. In early spring and summer, the water levels of these reservoirs are controlled approximately 6 m lower below the normal top water level. Because the lower range of the banks appears only during these periods, the plant communities observed there show the adaptation to the long inundation term and the short growing period. The area studied are classified into four zones according to the elevation in both reservoirs. The zones have different plant communities corresponding to the inundation period.
