In Yorkshire the 'clocks' were blown to tell the time - and the single floating seeds were called fairies.
The slightly different and larger seed carriers of Rose Bay Willow Herb were called angels, and although I never found the plants growing in the area I frequented in their season the seed carriers would come floating on the breeze - usually from the NorthWest in the evenings, and go off down the hill.
They were called pis your bed, presumably they have diuretic properties, on the estate we moved to when I was seven. The nasty big boys would pull up the largest plants they could find and lash the dirty root in the faces of smaller children, shouting that it would make them wet their beds that night. I think the fun went out of it for them when I learned what a knee in the jocks would do to them, and encouraged all the other victims to attack the same spot.