n (Gr. kalyx, a calyx, cup) the outer covering of a flower external to the corolla, which it encloses, and consisting of a whorl of leaves, or sepals, usually of a green color and less delicate in texture than the corolla.
The outermost part of a flower, which can consist of separate sepals or be fused into a singer organ. The calyx is normally tough and green and protects the corolla within. In some plants, however, it is brightly colored and resembles the corolla.
the outer circle of floral leaves, consisting of the sepalswhich may be distinct or joined together. If only one circle of floral leaves is present, it is called a calyx even though it appears like a corolla.