Aestivation :
The mode of arrangement of sepals, petals or tepals in a flower with respect to the members of same whorl is known as Aestivation.
Epicalyx :
It is an additional whorl of sepal like structures formed by bractiole which occurs on the outside of calyx.
These are 5-8 in number. It is a characteristic feature of family, Malvaceae. They are protective in function. e.g. Ladies finger
