This small, low-growing plant is more often found growing on old walls and in bare, stony places. A hairy, sticky annual, it grows to about 15cm high and often has a reddish hue to its leaves and stalks. The white, 5-petalled flowers (4-6mm across) are borne in clusters on erect stalks, flowering from March to September. The leaves are pinnately divided into 3 or 5 lobes and are untoothed. It is a native plant and it belongs to the family Saxifragaceae.
I first found this little plant growing on a window-sill in the cathedral ruins at Cashel, Co Tipperary in 1977. I photographed it in Mullingar, Co Westmeath and Kilkenny town in 2009.
If you are satisfied you have correctly identified this plant, please submit your sighting to the National Biodiversity Data Centre