I call this, single buttonhole-knot because the knots are made only on one side of the petal.
Make a straight stitch from A to B (if you're using pearl cotton thread, 2 strands would be needed).Come back at A and start making buttonhole knots from A to B.
This is a single buttonhole-knot petal.
The flower on the left is made with Anchor pearl cotton no:8 thread, the one on the right with 6-strand embroidery floss.
