It can tolerate wave action better than some other bay grass species. Wild celery is the only plant with a cork-screw, round stemmed seed head, and sometimes a small white flow… V. americana is a fresh water species that can tolerate salt, living in salinities varying from fresh water (0 parts per thousand) to 18 parts per thousand, although the limit to the salt tolerance is unclear, and is generally dependent on the duration and intensity of the plants’ exposure to the saline water. // -->