it's possible that it's the ruching technique . . . like this tut - scroll down to see the smoke lavender one that does the "U" stitching.
and it all depends on the width of the ribbon, the length of each petal, how many petals/size of petals & how loose/tight it is gathered. the one in your pic looks like skinnier ribbon.
this is my guess! http://craftyadhd.blogspot.com/2010/...on-flower.html
edit . . . on the turquoise ones . . . i count anywhere from 18-20 petals.