the point of origin for the rotation by clicking on the rotate tool in the toolbar
to make it active, then holding the option/alt key as you click the point you
want the petal copies to rotate around. Double click the rotate tool and set the
rotation angle you wish. This one is set to 20°. Click Copy.
Use command/control +D to add as many petals as you want. There were 16 added
As you can see the last petal is on top instead of tucked under the first one.