Although they are relative latecomers on the evolutionary scene, having emerged only 135‒170 million years ago, angiosperms--or flowering plants--are the most diverse and species-rich group of seed-producing land plants, comprising more than 15,000 genera and over 350,000 species. Not only are they a model group for studying the patterns and processes of evolutionary diversification, they also play major roles in our economy, diet, and courtship...