Contenido: Introduction to systematic botany. -- Historical background of classification. -- Plant nomenclature. -- Principles to plant taxonomy. -- Sources of taxonomic evidence. -- The origin and classification of the Magnoliophyta (Angiosperms). -- Evolution and biosystematics. -- Techniques. -- Specimen preparation and herbarium management. -- Methods of identifying vascular plants. -- Terminology of flowering plants. -- Selected literature of systematic botany. -- Pteridophytes. -- Gymnosperms. -- Angiosperms families. -- Glossary of greek and latin words. -- Selected literature for the identification of vascular plants in North America North of Mexico. -- A list of the classes, subclasses, orders, and families of the Angiosperms according to the Cronquist system of classification. -- Classification of the Angiosperms according to the Thorne system. -- Indexes Donación Dr. Federico B. Vervoorst