Usually the petals are the colorfal/attractive part of a flower.
In most plants, this would be the flower; specifically, the petals.
Together, the petals of a flower are called a corolla. Also, the sepals as a group are called the calyx, and the corolla and the calyx together are called the perianth.
Petals are usually surrounded by sepals, which are usually photosynthetic (green) and support the petals from underneath. They may be slightly smaller than the petals, tiny, or even apparently absent; occasionally they may be larger and showier than the true flower petals.
Complete flower
dependent
A calla lily is an example of a one-petaled flower.
The collective name for the petals of a flower is the corolla.
Yes
Euphorbia flower does not have petals.
I think it's called essential oil.
The sterile leaves of the flower are the sepals and the petals.