sentences:  Beach dunes consist of the "foredune", the angled side which faces the ocean, the "sand plain" at the top of the dune, which may or may not be present, and the "backdune", the angled side that faces away from the ocean.Plants that thrive on the foredune must be tolerant to salt spray, strong winds, and burial by blowing/accumulating sand.Typical vegetation includes Ammophila arenaria, Honckenya peploides, Cakile maritima, and Spartina coarctata.