A lovely plant with a now as lovely Latin name, though it is known around here as Snow on the Mountain. There is also at least one other plant that also goes by that common name, so I don't know it everyone everywhere calls it that.
Its color is a blue/green/grey and it has chalk white edges. Height is about 8 inches. It sometimes blooms with a rather undistinguished flower, but not always, and it spreads primarily by underground runners, not seeds. It is quite a standout. Its one drawback is that is spreads. Its one strong point is that it spreads. Not really a contradiction. It you are looking for a ground cover that will spread rapidly and cover a shady hillside to help stop erosion, this could be just the perfect plant. If you are just looking for a nice garden perennial that will be well behaved, you should probably look at something else.
Hank planted some years ago, long before we met, and I am still keeping it under control. Short of ripping out the entire garden and starting over, that's the best I can hope for. Since I can't get rid of all of it and because I really do like the looks of the plant, I opt for just keeping it in a small patch and ripping out the rest. Not a perfect solution, but it's working for now.
Tomorrow - more groundcovers to beware of.