Typical form of Corolla. 2, Polypetalous, regular (buttercup).

Buttercup

Typical form of Corolla. 2, Polypetalous, regular (buttercup).

Typical form of Corolla. 4, Hypogynous petals (buttercup).

Petal

Typical form of Corolla. 4, Hypogynous petals (buttercup).