Sagot :
When a flower is a bud, it is surrounded by sepals, which in many cases are green, as in this example. They protect the flower bud and are behind/underneath the petals when the flower opens. Together, all of the sepals are called a calyx.
Answer:
Sepal
Explanation:
A sepal is usually green and can be found underneath the petals. It encases and protects the flower when it is in the bud stage.