Wow, thanks Jim. It sure does look like a Schom/Catt (couldn't resist). I like the colors in your picture above better, but I imagine it's just different cameras and possibly the age of the flower. They named it 'Lemon Twist' for a reason, I think the pale yellow plus the dark lip is gorgeous.
Do you recall offhand where it came from, or who was showing it? I haven't found a grower with it for sale, but I just started looking an hour ago. (my kids need a new 'wish list' from me for Mother's Day)