The sepals and the petals are the sterile leaves of a flower. This is in contrast to the pistils and stamens, which are the parts of a flower used in reproduction.
The sterile leaves of the flower are the sepals and the petals.
stigma
the flower is sterile
The noun perianth is a collective term for all the petals and sepals.
Petals are sterile, but they are still an organ of the flower.
If there is no ovule in a flower, a seed can not be formed. The flower is sterile. However many plants can reproduce asexually.
A perianth is a sterile part of a flower, consisting of the sepals and petals.
Lantanas are made of small florets. They can produce seeds (except for some varieties that were deliberately made sterile.) They are a complete flower.
photosynthesize
photosynthesize
The red leaves of a poinsettia are not part of the flower, which is small. They are differently colored normal leaves.
A flower is part of a plant, which has leaves. Leaves provide the plant with energy through photosynthesis.