This forum is so good, it feels like cheating to tap into your collective knowledge. People should have to work harder for their plant IDs! Nonetheless, I'm posting again. This plant is a three- to four-foot shrub. It has very fine, grayish twigs. It is among the last things to leaf out in the spring, and its buds are hidden or very small, so for two springs I've worried that it didn't overwinter. When it does leaf out, it has small, entire, opposite leaves. The flowers come in June and have five petals fused to form a purple trumpet, about an inch long. The bees, particularly the bumblebees, go nuts over it, but the flower openings are too small for the bumblebees to crawl into, so I'm surprised that the flowers are so attractive to them. Sorry for the quality of the photos. I snapped them in a rush before my wife took off with the camera. Name that plant!