Temporal range: Lower Cretaceous – Recent
The dicots and monocots are the flowering plants which took over in the long Cretaceous period. They largely replaced the earlier types of plants. Of the old forests of the Mesozoic era, only the conifers are still common today.
The tree forms of flowering plants evolved during the Cretaceous period. These began to displace the conifers during the Tertiary era (66 to 2 million years ago). Forests covered much of the globe before the climate cooled.
- Endress, Peter K. 2002. Morphology and Angiosperm systematics in the molecular era. Botanical Review. Structural botany in systematics: a symposium in memory of William C. Dickison. 68 (4): 545–570. 
- Soltis, Douglas E.; Soltis, Pamela S.; Endress, Peter K.; Chase, Mark W. 2005. Phylogeny and evolution of Angiosperms. Sunderland, MA: Sinauer Associates. ISBN 9780878938179
- "Tree evolution". Tree Biology. Royal Forestry Society. 2012. Archived from the original on 2016-10-23. Retrieved 2012-07-25.