Life › The age of dinosaurs › Flowering plants
Flower–pollinator partnerships
c. 125–90 million years ago· Evolutionary innovation· Plants & fungi
Strong evidenceGood evidence; dates or details still being refined.
The trade between flowering plants and animals: flowers offer nectar and pollen, and animals carry pollen to the next flower.
See it on the Life map →What happened
A plant cannot walk to a mate, so it needs pollen moved to another plant of its kind. Wind works but wastes pollen. Beetles, flies and scorpionflies were already visiting cone-bearing plants in the Jurassic. Flowering plants refined the deal with colorful petals, scent and nectar that drew animals straight to the next flower. By about 99 million years ago, amber preserves beetles dusted with flower pollen. Today roughly 85–90% of flowering plant species rely on animal pollinators.
Why it matters
Targeted delivery lets even rare, scattered plants mate and encourages new species to split off, a likely reason flowering plants came to dominate land vegetation.
Think of it like
Like a courier paid in snacks: the insect gets a meal, and the plant gets its pollen delivered to a matching address.
The evidence (fossils, genes, rocks)
Fossil flowers built for insect visits, insect mouthparts, and Myanmar amber holding a 99-million-year-old beetle carrying flowering-plant pollen (described 2019); plus living plant–pollinator pairings.
Still debated
Whether insects drove the flowering-plant boom or simply followed it is debated, as is whether the earliest flowers were mainly beetle- or fly-pollinated.
Inside this (1)
Connections (2)
▸Flowering plants formed Flower–pollinator partnershipsWell established
The connection
Flowering plants turned pollination into a trade. Instead of releasing clouds of pollen into the wind, they offered nectar, pollen and scent in showy flowers to animals that carried pollen straight to another flower of the same kind. As flowering plants diversified in the mid-Cretaceous, flower shapes increasingly matched particular visitors.
When and how
Mid-Cretaceous, about 125–90 million years ago, as flowering plants spread; key fossils come from Myanmar amber and fossil-flower beds in Portugal and North America.
The evidence
Fossil flowers with features for insect pollination, sticky pollen clumps, and amber insects carrying flower pollen, including a 99-million-year-old beetle described in 2019.
Debates and open questions
How much flowers co-evolved with insects, versus borrowing insect habits already formed on cone-bearing plants, is debated.
▸Flower–pollinator partnerships came to rely heavily on BeesWell established
The connection
Many animals visit flowers, but bees do it deliberately: they collect pollen, not just nectar, as food for their young, and many visit one kind of flower at a time. That makes them unusually efficient couriers, and many flowers evolved shapes, colors (including ultraviolet patterns) and opening times suited to bees.
When and how
Worldwide, from about 100 million years ago; bees and flowering plants diversified together through the late Cretaceous and the age of mammals.
The evidence
Bee-adapted flowers today, bees' pollen-gathering hairs, and amber bees such as Discoscapa (2020) carrying pollen grains about 100 million years ago.
Debates and open questions
How quickly bee–flower specialization developed is uncertain, because bee fossils are rare before about 50 million years ago.