I saw a number of common names for this flower when I plugged in the words “Perennial Cornflower Centauria Montana” into a search engine. They included Mountain Bluet, Mountain Cornflower, and Bachelor’s Button. I also found the following description, among others. “Perennial Cornflower Centauria Montana is a species of Centaurea endemic to Europe. It is widespread and common in the more southerly mountain ranges of Europe, but is rarer in the north. It escapes from gardens readily, and has thereby become established in the British Isles, Scandinavia and North America.