Linked from
The 12 pages that link to Petal, each with the reason it gives.
BractCompared with: Showy bracts can look like petals but arise outside the flower's floral organs.
PerianthBroader topic: Petals are the individual units of the perianth’s inner whorl.
TepalCompared with: A tepal is not clearly distinct from this inner floral part.
CorollaBroader topic: Each petal is one component of the corolla.
SepalRelated: Petals sit just inside the sepals in the typical flower.
Floral formulaRelated: Petals form the corolla and are counted as a distinct floral whorl.
CommelinaceaeRelated: The family is noted for flowers commonly organized around three petals.