Dots and Dashs (No "e" in Dashs) is a Minnesota introduction bred by Ruth and Hugh Cocker of Rochester, Minnesota. It was created by hand pollination with mixed pollen. Consequently, it's siblings range widely in form and color.
The RHS (Royal Horticultural Society) that oversees lily registering, almost didn't let Hugh use that name because "dashs" wasn't spelled correctly. But that was the way Hugh wanted it, and he persevered. Incidentally, the name is in reference to Morse code, according to Hugh.