Another pink flower, four petals

Here is another pink flower in our garden, name unknown. The urn-shaped receptacles left behind after the petals fall remind me of a Silene, but the petals on this are quite different.

Any idea what it is?

 

Rhexia?

 

Thanks, David.

I looked up Rhexia in a couple of wildflower guides, and ours seem to be Rhexia virginica, Virginia Meadow-Beauty.