Flowering plants co-evolved with pollinators. In a sense they exist for each other. Some flowers are formed in such a way that they are only compatible with a certain kind of pollinator, for example a long or a short tongued bee.

 Umbellifers on the other hand attract many different pollinators. Both bumblebees and honeybees frequent them (as seen above) and a very wide range of insects. The umbels are a mass of tiny flowers and in effect function as a platform for pollinators to forage on.