Calyx:

It is the outermost whorl of the flower. Sepals of flower are usually leaf like green in colour and protect the flower in bub condition.

1. Forms of calyx: The calyx is composed of sepals which may be free or united. If all the sepals in a calyx are free, it is described as polysepalous e.g. Brassica campestris and if the sepals are united the calyx is spoken as gamosepalous.

        The sepals may be coloured like petals called petaloid (larkspur).

Function of calyx

2. Function of calyx:

1. The calyx provides support to the thalamus and other floral parts.
2. It also protects the internal floral organs (petals, stamens and carpels) in bub condition and attract insects.
3. Calyx also attracts insects when becomes coloured or produces nectar.
4. It forms the function of photosynthesis.
5. The calyx of Hibiscus subduriffa becomes fleshy due to storage of food and are edible.

 Epicalyx:

       In some plants a whorl of green sepals like structure is present at the base of calyx called epycalyx. Epycalyx is considered a whorl of the bracteoles and mostly found in the flowers of family Malvaceae.