The first stitch is a single herringbone and then filled in the curve with closed herringbone making bigger stitches on the outside curve. I suggest you draw the shape/curve you want onto the fabric. It is quick and easy to do and can be used 'as is' or a
whipped spiderweb The cool thing about this flower is that each spoke is not just a straight stitch, it is a long and skinny chain stitch. Once the whipping is done, the sides of each chain are pulled together to form the diamonds at the top.
detailed instructions for embroidery stitches - rocksea & sarah embroidery - site is not in English but there are arrows to the right and left of the image that allow you to scroll through many more excellent tutorials