This plant is a perfect example of how the same plant will behave differently in different environments.
My wife and I drove to Marietta Gardens and got this plant (and a number of others) direct from the Shooters (Faye, Elizabeth & John).
But yet, if you look at the pic by Calif_Sue and compare to the Guybo shot - you could easily be convinced that these are actually two different cultivars.
Happy Growing!