A Constellation of Flowers

I pulled into the parking lot of the local grocery store, and saw these flowers right in front of me. I had never noticed them before, or, perhaps they were not in bloom earlier. I was taken by the number of blossoms together like this. And also, they looked like stars - so many stars that it looked like a constellation. Of course I have no idea what flowers these are, but there are many of you out there who do, and I can't wait to find out!