This is to mark some stitching lines. 100 Stitches suggests that you draw two lines down the center of the shape you are filling to act as stitching guide lines and to designate the size of the stitch. Hmmm...let's hope I will be able to see these lines well enough!
The first step is to come up through your fabric on one edge of the shape: Now go down through the fabric at the farthest stitching guide line and come back up through the fabric at the edge of your shape: 100 Stitches stresses that this is all about stitching alternately on each side of the shape you are filling. The needle is always coming up through the fabric on the outside line of the shape. So now you pull the thread through and put your needle back down on the far stitching guide line and back up on the outside line of the shape:
And then back again:
Just keep alternating side to side. The stitches should be close together and overlap each other:
Just keep going until the shape is filled!
Repeat for each petal, add some back stitch around the center and put in some french knots and you have:
This stitch is very easy and really fun to do! It is stitch #10 and is in the Flat Stitches section of 100 Stitches.