Bob at DracoGardens always loves a good story (he took his blog name from the historical marker by his house, for chrissakes). And so, as he says, he acquired himself some Henry and Augusta Sage. You see, no one really knows for sure where the Duelberg Sages came from, what they do know is that they were found in a cemetary growing on a husband and wife's gravesite. One blue, and one white, the guy who found them and realized they were heretofore unknown varieties, started propagating them and they are now sold in nurseries. The Henry Duelberg is blue, and the Augusta Duelberg is white. And boy are they pretty.
You can read the story as told by the guy who found the plants, Greg Grant, here: http://www.plantanswers.com/salvia_arcadia.htm