Perigone is a botanical term that refers to the set of floral parts that encircle the reproductive organs of flowers, including the sepals, petals, or both. There are several other terms that are used synonymously for perigone, including perianth, tepal, and perigonium. The term perianth refers to the outer parts of a flower, which includes the sepals and the petals. Tepal is a term used for modified petals or sepals that look similar or are identical in appearance. The word perigonium is used to describe the fused perianth parts of a flower as a single unit. All of these terms help botanists and gardeners to describe and classify different types of flowers.