Buttonhole Stitch is the next one given by Sharon at www.pintangle.com It is also a favorite of mine. More stitching on black wool. Black makes colors sing.
I have a flower sampler started and addid this to it. It is all buttonhole even though part looks like Feather stitch-a relative of buttonhole.
Shisha is something I used to teach. Buttonhole is one way to attach objects to the cloth. In this case it is a large sequin which is lighter in weight than a mirror for clothing and comes in wonderful colors. There is a second row of buttonhole which is hard to see. The garment is a vest.