Extremely attractive annual with such a perfect name, this is a garden escape which is associated with disturbed ground. It has pale blue flowers (2-4cm across) which are comprised of 5 sepals surrounded by feathery leaves, the tiny clawed petals being located at the base of the stamens. They flower from May to July. The leaves are very finely divided and they encircle the flower like a feathery green collar, giving it the 'mist' part of the name. The seeds are in inflated capsules. This is not a native plant and it belongs to the family Ranunculaceae.
My first record of this plant in the wild was in Tullycanna, Co Wexford in 2008 where I photographed it.
If you are satisfied you have correctly identified this plant, please submit your sighting to the National Biodiversity Data Centre