Botany In a Day (APG): The Patterns Method of Plant Identification, by Thomas J. Elpel

The one day tutorial included in the text teaches you seven key patterns to recognize more than 45,000 species of plants worldwide. Master these seven patterns and you will be ready to use the included reference guide-Thomas J. Elpel’s Herbal Field Guide to Plant Families of North America. Here you will find the patterns of uses for the majority of plants across the continent.