My flower petal parts come in sets of 4 or 5?

Flowers with petals in sets of 4 or 5 typically belong to the groups of dicots, which are characterized by having two seed leaves. Common examples include plants from the families Rosaceae (like roses) and Malvaceae (like hibiscus). The arrangement often aids in pollination and reproduction by providing a certain symmetry that attracts pollinators. This characteristic is one of the key features used in plant classification.