The Seaside arrowgrass (Triglochin maritimum) belongs to the family Juncaginaceae. It is a perennial herb that is widely distributed in the warm to temperate zones of the Northern Hemisphere, including various parts of Japan. It grows in clusters on tidal flats and salt marshes near the coast, but it is rapidly decreasing due to reclamation and revetment work. The leaves are linear and rooted, soft and edible. From June to November, the flower stalks are extended and the pale yellow-green flowers that are inconspicuous in the racemes bloom. It is an amphoteric flower, and there is no perianth.