The following are known as accessory organs because they are not directly involved in pollination. Perianth - the outer floral parts, composed of the calyx and the corolla. Calyx - the ring of sepals making up the outermost, leaflike part of the flower. Sepals are commonly green, but may be almost any color and serve primarily as protection for the other floral parts. Corolla - the inner set of leaflike parts lying just within the calyx and composed of petals .
Petals are generally white or brightly colored to attract pollinating insects to their nectar.
They also serve as protection for the innermost organs. Receptacle or torus - the apex of the pedicel upon which the organs of a flower are developed. Floral Bracts - modified leaves which can simulate petals and add the conspicuous part to otherwise inconspicuous flowers. Reproductive Organs Reproductive organs are directly involved in pollination and fertilization, hence their presence usually determines the survival of the species. Stamens - male reproductive organs attached to the receptacle in some species inside the corolla or in other species to the corolla itself.