There are other daylilies with that purple/yellow colour, such as 'Howdy'. The daylily often sold (in North America anyway) as 'Magic Dawn' is reputed to actually be 'Howdy'. There was an original 'Magic Dawn' that was registered with the AHS as a rose pink self, so it appears even the AHS has the wrong plant picture in their database for that one!:
http://www.daylilies.org/Dayli...
Also the ATP database isn't picturing a rose pink self for 'Magic Dawn' either, although it describes it as such.
Sorry to sidetrack a little, I mainly just meant to say that there are other possibilities for the "imposter" in this thread.