This is a prostrate, fleshy, maritime perennial which creeps across gravely seashores and beaches, perhaps, with the help of its underground root system, helping to stabilise the eroding coastline and dunes. It is quite distinctive with its neatly arranged, yellowish pointed leaves in opposite pairs closely behind each other up the creeping stems. Its greenish white little 5-petalled flowers (6-8mm across) are held singly above the leaves, the petals being slightly shorter than the yellow-green sepals. They flower from May to August. The few seeds are yellow-green and globular. This is a native plant which belongs to the family Caryophyllaceae.
My first record of this wildflower is in 1980 at the beach of Five-mile Point, Co Wicklow. I photographed it in 2005 at Blackhall Strand, Co Wexford.
If you are satisfied you have correctly identified this plant, please submit your sighting to the National Biodiversity Data Centre