I was going to ask my wife what they were called since they were truly an arresting color, when I noticed a nursery card planted in the ground near them. Plumbago—It sounds like a physical ailment and so the computer wanted to change it. I, however, prevailed. They have a Latin name too: Ceratostigma Plumbaginoides, if I copied it correctly—tiny, intensely blue flowers that make an excellent border flower. And so they do.
I looked them up on the Internet, of course, and found a delightful picture of them that captured some of their full blue intensity.