Elymus arenarius, also known as Leymus arenarius, is a species of wild grass that is commonly found in coastal areas. It is a perennial plant that grows up to 120 centimeters tall and has a dense, fibrous root system that helps it tolerate harsh coastal conditions. There are several synonyms for Elymus arenarius, including Elytrigia juncea, Elymus mollis, and Elymus farctus. Despite its tough appearance, this grass is often used in coastal restoration projects to help stabilize sand dunes and prevent erosion. Its impressive resistance to salt spray, wind, and sand make it a valuable asset in coastal ecosystems, and its synonyms remind us of the many names and adaptations that different plant species possess.