A sepal (from Latin separatus "separate" + petalum "petal") is 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 is 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 is usually applied when the petals and sepals share t… (More on Sepal)