This tiny but tough little hairless perennial creeps across damp, gravelly ground, paths, lawns, walls and bare places. From a non-flowering rosette, its stems straggle along the ground, sending down roots at intervals, creating new rosettes. The tiny, long stalked flowers (2-3mm across) have four very pale green rounded petals which are much smaller than the sepals and often absent. If they appear at all, it's between May and September. The leaves are linear, bristle tipped and in closely spaced pairs. This is a native plant which belongs to the family Caryophyllaceae.
I first identified this wildflower in Gibletstown, Co Wexford in 2009 and photographed it there at that time.
If you are satisfied you have correctly identified this plant, please submit your sighting to the National Biodiversity Data Centre