Lyme grass, also known as sand rye, dune grass or sea lyme grass, is a perennial grass species that grows on sandy beaches and dunes. Synonyms for the word "Lyme Grass" include Marram grass, beachgrass, and Ammophila, which is the scientific name for this species. These grasses are adapted to thrive in harsh coastal environments, creating dense barriers against wind, waves, and sand movement. They also play a vital role in stabilizing coastal ecosystems and preventing erosion. These synonyms reflect the importance and broad distribution of Lyme grass in coastal regions worldwide, as well as its unique adaptations for life on the beach.