Bluets, Houstonia serpyllifolia, Hedyotis michauxii
Aka hedyotis caerulea. Zones 6-10 Click on photo to enlarge.
We came across this tiny sweet wildflower at one of our favorite nurseries last summer. The flowers are no more than 1/4 inch across. All three we bought seem to have survived the transplant and are still managing to survive in the cold although they haven't grown to any extent. One was again transplanted as it was close to a small tree I dug up and seemed to have increased its rootball so I'm encouraged that all will live and bloom again in late Spring. I am concerned that one of the botanical books describes it as being short lived. Hopefully it will reseed itself.
Here are two links with better photos from wiseacre-gardens and one from the Connecticut Botanical Society.