@StarJo - I know what you mean. I was fascinated to learn that the flower of the dogwood tree is actually the tiny mass of yellow stuff in the center of the white bracts, which I always thought were petals.
The bracts of the dogwood stay closed until the danger of freezing temperatures has passed. When they first open, you can see tiny yellow structures with smooth tops. In the area where I live, this usually happens in April.
These yellow flowers eventually blossom. The smooth petals curl open, and then you can see the greenish-yellow pistil surrounded by stamens holding up the yellow pollen.