The term used when there is no distinction between non essential or accessory floral organs, is

The non-essential parts of the flower are those that are not involved in the process of fertilization directly. These are called the accessory whorls. The calyx (made up of sepals) and corolla (made up of petals) represent the accessory whorls. In some flowers, the calyx and corolla are not differentiated or distinct. Then the resultant structure is called perianth whose individual units are called tepals.