IDENTIFIED: Some of these pink flowers popped up in the middle of some Autumn Joy plantings. I am guessing Centranthus Ruber coccinea because I planted some of those elsewhere in 2011, but I ripped them out in 2013 when I changed my mind. Also the pictures in catalogs show more compact clusters than these, so I hope someone can identify them. The petals have 5 lobes, height is about 30 inches and the leaves are smooth and opposite.