It is probably called Dahlia. It is an old pattern. It can be hand drawn if you feel comfortable.
Take graft paper and draw lines in center of square up and across and diagonally. Then draw one side of the petal and fold paper and draw the other. The petals do overlap. You could, of course cut the excess from the back when you finih the applique. I judged a show yesterday that had these as the border. When you draw your square the finished size of the block then leave about 1/4 margin all around the square to get the size of the petal. Remember the secret to drawing a perfect petal is when both sides match. When you get the size you need then add the seam allowance. Can then be needle turned or use a template to fold over the edges or can be blanket stitched.