Alnus Maritima, also known as the seaside alder or coastal alder, is a tree species that is mostly found in coastal regions. This tree species has many synonyms that vary depending on the geographic location and local language. In Europe, it is commonly referred to as Alnus glutinosa, while in Japan, it is known as Alnus firma. Other synonyms include Alnus rubra, Alnus rhombifolia, and Alnus incana subsp. tenuifolia. Despite the variation in name, this tree species is recognized for its hardiness in coastal climates, which makes it an important species for coastal restoration and erosion control efforts.