When a boy and his dog knock a leaf loose from a plant, the leaf (aptly named Leif), begins talking and gives them a quick historical tour of plants in this volume of the graphic Earth's Amazing Journey series (4 titles). Before delving into thematic chapters, the cartoonish Leif briefly describes basic plant traits and photosynthesis. The first chapter examines the evolution of plant life on Earth, setting the book's focus as Leif continues to describe how evolution has influenced vascular plants, seeds, and flowers in subsequent chapters. The final chapter, on agriculture, shows the progression of humans gathering and harvesting plant products over time. Illustrations resembling animation, along with interspersed real-life plant scenes, combine with Leif's joke-filled, conversational narration to make this book especially appealing to reluctant readers.