Over the five epochs of the Tertiary, we will be explaining to you the great changes that have taken place with vegetation. We will also explain the importance of wood- and grass-lands, how they affected the evolution of mammals, and how they affect you today.   Trees: Trees have been around for a long time. Their beginnings were in the Devonian period. It wasn't until recently that the "flowering" trees have come about, though. These include some fruit trees and deciduous trees. It doesn't include other trees, like the ginkoes, which have been around since the Mesozoic. Trees: Part 1 - Evolution of Trees Trees: Part 2 - How Trees Affect Mammals Grass: Grass is only a flowering plant, which means it appeared recently. Imagine a world without grass! From its onset, grass spread its influence around the world. Grass: Part 1 - Evolution of Grass Grass: Part 2 - How Grass Affects Mammals Grass: Part 3 - Grass' Effect on Us

A picture of animals living in both grass and trees.

Cenozoic Era: Tertiary Period: Botanist'sList