This is a hydrangea. It's from Kumiko Sudo's book Fabled Flowers. You can see someone's version at this website:
http://quiltingroom.blogspot.com/2007/11/monthly.html
This is the book:
http://www.amazon.com/Fabled-Flowers.../dp/0844226459
And here's one from a member of the QB:
http://www.quiltingboard.com/picture...d-t127691.html
They are beautiful, aren't they!