Bachelor’s Button, a non-native species, has been added to the USWildflowers database (10/11/2010.)  Scientific name is Centaurea cyanus.  It’s also known by the common names Bluebottle, Cornflower, Garden Cornflower.  Photo below was taken in the Pioneer Cemetery in Horseshoe Bend, Idaho on June 17, 2010.

Bachelor’s Button, Bluebottle, Garden Cornflower - Centaurea cyanus