S. maritima) is a species of flowering plant in the family Caryophyllaceae known by the common names media sandspurry[2] and greater sea-spurrey.

It is known in many other parts of the world as an introduced species and a common roadside weed.

In North America it is a "highway halophyte", often springing up at the margins of roads that are heavily salted in the winter.

[4] It is an annual or perennial herb producing a narrow stem lined with fleshy linear leaves.

The small flowers are 8 to 12 mm across with five petals which are usually slightly longer than the sepals.