There is such appeal to the corn snakeroot for me. I think it is mostly that cornflower blue color, but I also like the thistle-y form.
The formal name is Eryngium aquaticum. It is in the carrot family and has many other common names: Button snakeroot eryngo, button snakeroot, eryngo, feverweed, rattlesnake flag, rattlesnake master, rattlesnake weed, and water eryngo. These common names come from the thought that parts of the plant could be used to treat snake bite. (I wouldn’t recommend it.)
They seem to like to have their “feet wet” (hence that aquaticum part of its name) and can be found growing in marshy areas beside roads.