Yellow Archangel. The name evokes a visitor from on high. I suppose it's derived from the appearance of the flower which is yellow and appears to be winged.
Lamiastrum is native to much of Europe, but was introduced to North America as an ornamental plant. Finding much to its liking, the plant has made itself at home. Which is fine if you really like it, as I do. It is most effective as a ground cover, especially in light shade. Provided that its needs are met, it requires little maintenance.