A ring of 5 or more petals with the center of peony made up of stamens with pollen-bearing anthers.
A ring of petals around a central cluster of modified stamens that are narrow and flat and bear no pollen.
A ring of petals around modified stamens which are fully transformed into narrow petals (petaloids).
Several rings of petals around visible pollen-bearing stamens.
Many concentric rings of petals with no visible stamens (stamens have been completely transformed into petals).