: Research in the buttercup family ( Ranunculaceae ) shows that independent petal losses are often linked to the disruption or silencing of specific floral identity genes, such as APETALA3-3 (AP3-3) .
When petals are missing, other parts of the flower often take over their typical roles:
: Many apetalous plants are anemochorous (wind-pollinated), as seen in species like Pistacia lentiscus . Without the need to attract insects with petals, these plants often produce large amounts of lightweight pollen. Structural Substitutions
: In some cases, the loss of petals may provide physiological benefits. For example, apetalous varieties of oilseed rape ( Brassica napus ) allow more light to reach lower leaves and pods, potentially leading to higher seed yields.
Apetaly is found across various unrelated plant lineages, suggesting it has evolved through .