Leaf-like structures located beneath the petals of a flower; collectively the sepals form the calyx, and are usually green. Some species of flowers lack petals, in which case the sepals may be brightly colored and take over the function of the missing petals, e. g.,marsh marigold (Family Ranunculaceae).
Modified leaves that protect a flower's inner petals and reproductive structures. Small, leaf-like structures in flowers that enclose and protect the developing flower. These are often green, but in many monocots they are the same color as the petals (in which case the term tepal is applied since sepals and petals look so much alike).
The petal-like structures just below the petals in some flowers. Sepals may be the same or different color, the same or different size, and in the same plane or held reflexed, as compared to the petals. In a single flower, all of the sepals taken together as a unit are called the calyx. The corolla and calyx taken together are called the perianth.