Calyx protects the flower in bud stage. Outermost whorl of flower is calyx. Unit of calyx is sepal. Normally green in colour.
Aposepalous (polysepalous or
chorisepalous): The flower with distinct sepals. Example: Brassica, Annona.
Synsepalous: The flower with united or fused sepals. Example: Hibiscus, Brugmansia.
What is the green part of brinjal fruit? Have you
seen similar to this in any other fruits?
Caducous or fugacious calyx: Calyx that
withers or falls during the early development stage of flower. Example: Papaver.
Deciduous: Calyx that falls after the
opening of flower (anthesis) Example: Nelumbo.
Persistant: Calyx that persists and
continues to be along with the fruit and forms a cup at the base of the fruit.
d. Accrescent: Calyx that is persistent, grows along with the fruit and encloses the fruit either completely or partially. Example: Physalis, Palmyra.
Have you noticed the shoe flower’s calyx? It is
bell shaped called Campanulate. The
fruiting calyx is urn shaped in Withania
and it is called urceolate. In Datura calyx is tube like and it is
known as tubular. Two lipped calyx
is present in Ocimum. Sometimes calyx
is coloured and called petaloid. Example: Saraca, Sterculia.
Calyx is distinctly leafy,large and
often yellow or orange coloured sometimes white as in Mussaenda.
It is modified into hair like structure or scaly
called pappus as in Tridax of Compositae.