Appendix 2.1: An updated infrageneric classification of the oaks

The Appendix includes the following information (which may be subject to future updates): (i) an overview of earlier systematic schemes for oaks (genera, subgenera, sections) in comparison to the new classification; (ii) diagnostic morphological
traits reported by earlier taxonomists extracted from the original literature; (iii) a comprehensive list of formerly and currently accepted species of oaks, compiled from the cited oak monographs and complemented by further data sources.