Please help me identify this....

I found this page on LOLs' link
http://www.pages4u.co.uk/musicalinstruments_Lunaria%2BAnnua_120.php
Which does look like your flower in colour but not shape? Following LOLs' name I found this on T&Ms' US site, no picture but description is pretty clear:
http://seeds.thompson-morgan.com/us/en/list/bedding-24-36/5
Scroll down to Lunaria.

 

Thanks Liz, That certainly does look like the one I have. The labeling on the photo implies that it is a mutant - does anyone know what this means in plant terms, and whether or not it is likely to be stable, or if the mutant has a specific varietal name etc...?