I was going to say 'Figwort' from the flower but was going to check the leaf, then I saw the other posts. Attractive to wasps, not to the point it is a problem, but curious, you don't usually see wasps visiting flowers.
Just an FYI post...I have tons of wasps in my yard, you could say that my yard is a wasp sanctuary.
Wasps do visit flowers, but they seem (in my personal observation) like small flowers. I'm always seeing them on flowers of my pokeweed and American Beautybush and other native plants with very small flowers.
However, the most common thing I see wasps doing is hunting for larvae to feed their larvae; I never see them going from one flower to the next like bees, probably because they only feed off the flower for personal food intake and then the rest of the time they're hunting for caterpillars. Apparently their larvae are very hungry and require a lot of caterpillars to grow, because I've never had a problem with Tomato hornworms or any other caterpillar plant damage.
Disclaimer: I seem to be the only Yankee on this thread, so maybe my Yankee wasps are different