I see Three-cornered Leek (Allium triquetrum) all over the place. It was introduced to this country from the Mediterranean (in 1759 according to some sources). The flowers are striking en masse and there's plenty of straggly greenery. 

 I once saw the front garden of a dilapidated house carpeted with A. triquetrum and it was a picturesque sort of a scene. However ecologists have noted that it can be very invasive of natural habitats where it outcompetes and overwhelms native flora.