Someone probably planted these in the Starr King Open Space.
Cornflower (Centaurea cyanus)
Cornflower, Kornblume, Centaurea cyanus.
just have to put it in... growing last 4 years on the lowest ground on this property. Why these are 'cornflowers' beats me; and they are memorable as quintessential buttonhole ware for young gentlemen dressed up.
Archie Goodwin observed women with cornflower-blue eyes in more than one of the Nero Wolfe stories.