The 6 types of trees: (top to bottom) Deciduous, Tree Fern, Conifer, Cycad, Ginkgo, Palm

Trees have been around since the Devonian, when certain plants developed harder bark. Although these weren't your average oak or redwood, they were the ancestral roots or the family tree (no puns intended). It didn't come together until the years of the Carboniferous swamps and forests (read all about it!). the trees there, though, were very unlike those of today. Since neither deciduous nor coniferous trees had evolved, there were only giant clubmosses or horsetails, which weren't very woody. Although these types of trees lived happily in warm, muggy conditions, new trees, the conifers, developed in cooler areas. Conifers still thrive in the cooler areas of the world today, as firs, pines, spruces, etc. Conifers continued to develop throughout the Mesozoic, to the ones we know today. Other types of non-flowering trees developed in the Mesozoic, such as ginkgoes and cycads. This was also the time when flowering plants expanded. Deciduous trees are now the dominant types of tree.