A sepal (from Latin separatus "separate" + petalum "petal")'s a part of the flower of angiosperms (flowering plants). Sepals in most flowers are green and lie under the more conspicuous petals. As a collective unit the sepals form a calyx, whereas the collection of petals's called the corolla. Together, these two structures are known as the perianth of the flower. Sepals are usually green, regardless of petal color. However, the term tepal's usually applied when the petals and sepals share the… (More on Sepal)