Angiosperms - Hundreds of millions of years ago, the Earth was dominated by ferns and conifers. Then, about 150 million years ago, the first flowering plants appeared on the scene. They quickly spread to all parts of the world, changing the landscape from muted green to a riot of vibrant color.

angiosperms - A flowering, fruit-bearing plant or tree known for having ovules (and therefore seeds) develop within an enclosed ovary

BBC Science - How flowering plants conquered the world

THE FEYNMAN SERIES - Beauty