Although common dandelions (Taraxacum officinale, Asteraceae) are so abundant they’re usually considered weeds, they do have some benefit. In colder climates they’re among the first plants to flower, making them an important source of pollen and nectar for newly-emerging ants (Hymenoptera: Formicidae) and bees (Hymenoptera: Anthophila).
In addition to the opportunistic foraging by ants and bees, dandelions are the preferred food for the caterpillars of many moth species.
While insects do provide some pollination for these plants, dandelions primarily reproduce through apomixis and don’t require fertilization. The seeds are usually formed asexually, resulting in offspring that are genetically identical to the parent.