Magnolia Flower Anatomy

The magnolia is an ancient tree. There are fossil magnolias dating back to 58 million years ago. 

"...the most primitive of all living angiosperns belong to the subclass Magnoliidae. This subclass contains several primitive plant families, including the water-lily family (Nymphaeaceae), buttercup family (Ranunculaceae), and magnolia family (Magnoliaceae)" 

Armstrong, W. P. “The Magnolia Family (Magnoliaceae).”
https://www2.palomar.edu/users/warmstrong/trmar98c.htm.

The flower bud is protected by tough bud scales that are quite hairy. The bud scales are pushed outward to reveal the flower.

The anatomy of the flowers is different from trees that developed later in Earth's history. The flowers are considered to be primitive as they don't have true petals. They have tepals (which are a combination of a sepal and a petal.) These tepals are tough and they are designed so as to protect the inner parts of the flower from beetles, which were the original pollinators of these ancient flowers. As the flower matures, the bud scales are shed.

As the flower opens up, it reveals a tight bundle of rose and yellow-colored, striped stamens that surround the stigmas on the ovary. You can just see a hint of yellow pollen on the inside of the stamens. And, the stigmas are sticking up like a bad hair day!

Stamens are attached to the base of the ovary and are arranged in a spiral pattern. As they mature, they spread outward. The stigmas are attached to pistils and capture pollen that eventually fertilizes ovaries. 

Eventually the tepals fall off revealing the green receptacle housing the ovaries. The stamen whorled at the base of the receptacle are the next to be shed.

Each pistil is attached to its own ovary. And the ovaries are housed in the green fingerlike receptacle. The stamen have fallen off as have most of the stigmas.

"Once pollination has taken place, these pollen-producing bodies are shed, revealing the cone-like ovary where seeds will form." 

https://homeguides.sfgate.com/magnolia-flower-61031.html

And, the end result of all this fabulous development are the beautiful, red aggregate fruits that contain seeds that develop in autumn. These fruits are...
"just like blackberries--except that blackberry fruits are fleshy, while magnolia fruits are dry."   Conrad, Jim. “Magnolia Flowers.” Https://www.backyardnature.net/fl_magno.htm.