This document provides an overview of plant evolution and diversity. It discusses how plants evolved from green algae around 500 million years ago and began colonizing land. Key events included the development of vascular tissue that allowed for water and nutrient transport, as well as structural support. This enabled the evolution of non-vascular bryophytes and vascular plants with tracheids. Vascular plants diversified into seedless and seed-bearing forms. Seed plants like angiosperms were more successful and diverse, having specialized tissues and more efficient reproduction. Plant adaptations like cuticles, stomata and lignin allowed for survival on land in various environments. Today there are over 300,000 known plant species across many divisions and environments.