This is a tiny flower, about the size of the nail on my pinkie. It's blooming now, as I write this, inside of a large pot on my front porch. The "real" flowers in the pot are all dead, and my wife claims this is a weed. At least she didn't plant it. Since it is in a pot, maybe it hitched a ride in the potting soil or with the geraniums that were planted in it.
The kind folks at the WVU Greenhouse have identified it as Lobelia erinus or one of its hybrids.
This photo marks a bit of an improvement in my technique. I used an Orbis light ring to provide the extra light that I needed to get more depth-of-field than I've been able to get in normal lighting situations -- particularly on a November evening.