Sea-purslane (Halimione portulacoides)
Plants need to be tough to with stand the high salt content of both the ground and the air and they also have to cope with occasional entire submersion in salt water.
Sea-purslane is another of those plants adapted to such a life style. They thrive in drier salt marsh areas but still around the high water mark so have to contend with a soaking from time to time.
Another plant that is not much to look at but not to be overlooked.