The book progresses systematically, starting with defining ""tree-ness"" and differentiating true trees from other plant forms. It then delves into the fossil record, tracing the emergence of early tree-like plants and the evolution of major tree lineages. Key innovations like vascular tissue, seeds, and wood are examined, explaining how they enabled trees to colonize diverse habitats.
Concluding with a discussion on current tree diversity and conservation, Tree Evolution synthesizes the latest research in paleobotany, genetics, and ecology, providing a comprehensive overview of tree evolution unlike books focused solely on identification or ecology.