My mom has these in her garden. I asked her what kind of flowers they are, and she said she doesn't know. I don't know either, but I like them. This is the second or third year she's had them in the same spot.
September 2015 - I dropped my Nikon L22 at the arboretum (on asphalt!) and it's definitely broken. :(
October 2014- finally reached 365 photographs and it...
They look like the flower that we call "pinks" ... dianthus. Check out this site to see if you think they might be. http://www.gorgetopgardens.com/perennials/dianthus.html
In fact, I'm pretty sure that is what they are!!!
I call them pinks they are like a mini carnation but not as complex petals they are usually beautifully marked too. These have very frilly petals perhaps a variation?
In fact, I'm pretty sure that is what they are!!!
Your photograph looks very much like this, I think!