Is it a dahlia?
Take a look at
http://www.quiltingboard.com/t-69489-2.htm
It's funny I remember it from about 25 years ago so it must be in some of the quilt books because I didn't have a computer back then. When I did an image search the only place I found it was on Amish sites (and the one above) so maybe it's called an Amish Dahlia. For some reason I thought it was a Pieced Dahlia.