I bought this plant last year at a small nursey on sale at the end of the year. The tag had fallen off. It was on a table with May Night Salvias but it didn't look like them. It sure isn't a May Night now that I have two of them. It came back this Spring and looks beautiful and it attracts bees like crazy. Can anyone tell me what kind it is?

Here is a link that might be useful: Mystery Salvia Picture