The term PERIANTH refers to the collective parts of a flower, which are composed of the sepals (6 letters), COROLLA (7 letters), and CALYX (5 letters). The sepals are the outermost layer of the flower and form the protective covering for the petals. The COROLLA is the innermost layer of the flower and consists of the petals. The CALYX is the green, leaf-like structure that encloses the petals and sepals. Together, these three components make up the perianth of a flower.