At the Desert's Green Edge weaves the Pima view of the plants found in their environment with memories of their own history and culture, creating a monumental testament to their traditions and way of life. Rea first discusses the Piman people, environment, and language, then proceeds to share their botanical knowledge in entries for 240 plants that systematically cover information on economic botany, folk taxonomy, and linguistics. The entries are organized according to Pima life-form categories such as plants growing in water, eaten greens, and planted fruit trees. All are anecdotal, conveying the author's long personal involvement with the Pimas, whether teaching in their schools or learning from them in conversations and interviews.