Species are native to Western Asia and Western North America. They produce catkins up to 10cm long; the acorns mature annually.
The intermediate oaks. Southwest USA and northwest Mexico. Styles short, acorns mature in 18 months, very bitter, inside of acorn shell woolly.
The red oaks (synonym sect. Erythrobalanus), native to North, Central and South America. Styles long, acorns mature in 18 months (in most species), very bitter, inside of acorn shell woolly.
Species are native to Europe, north Africa and Asia. Styles long; acorns mature in 18 months, very bitter, inside of acorn shell hairless or slightly hairy.
"Quercus L." Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 2023-02-17. https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:325819-2
Denk, Thomas; Grimm, Guido W.; Manos, Paul S.; Deng, Min & Hipp, Andrew L. (2017). "An Updated Infrageneric Classification of the Oaks: Review of Previous Taxonomic Schemes and Synthesis of Evolutionary Patterns". In Gil-Pelegrín, Eustaquio; Peguero-Pina, José Javier & Sancho-Knapik, Domingo (eds.). Oaks Physiological Ecology. Exploring the Functional Diversity of Genus Quercus L. Cham.: Springer International Publishing. pp. 13–38. doi:10.1007/978-3-319-69099-5_2. ISBN 978-3-319-69099-5. 978-3-319-69099-5
Denk, Thomas; Grimm, Guido W.; Manos, Paul S.; Deng, Min & Hipp, Andrew L. (2017). "An Updated Infrageneric Classification of the Oaks: Review of Previous Taxonomic Schemes and Synthesis of Evolutionary Patterns". In Gil-Pelegrín, Eustaquio; Peguero-Pina, José Javier & Sancho-Knapik, Domingo (eds.). Oaks Physiological Ecology. Exploring the Functional Diversity of Genus Quercus L. Cham.: Springer International Publishing. pp. 13–38. doi:10.1007/978-3-319-69099-5_2. ISBN 978-3-319-69099-5. 978-3-319-69099-5
"Quercus L." Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 2023-02-17. https://powo.science.kew.org/taxon/urn:lsid:ipni.org:names:325819-2
Denk, Thomas; Grimm, Guido W.; Manos, Paul S.; Deng, Min & Hipp, Andrew L. (2017-11-02). "Appendix 2.1: An updated infrageneric classification of the oaks" (xls). figshare. doi:10.6084/m9.figshare.5547622.v1. Retrieved 2023-02-17. https://figshare.com/articles/dataset/Appendix_2_1_________An_updated_infrageneric_classification_of_the_oaks/5547622/1
Denk, Thomas; Grimm, Guido W.; Manos, Paul S.; Deng, Min & Hipp, Andrew L. (2017). "An Updated Infrageneric Classification of the Oaks: Review of Previous Taxonomic Schemes and Synthesis of Evolutionary Patterns". In Gil-Pelegrín, Eustaquio; Peguero-Pina, José Javier & Sancho-Knapik, Domingo (eds.). Oaks Physiological Ecology. Exploring the Functional Diversity of Genus Quercus L. Cham.: Springer International Publishing. pp. 13–38. doi:10.1007/978-3-319-69099-5_2. ISBN 978-3-319-69099-5. 978-3-319-69099-5
Borgardt, S. J.; Pigg, K. B. (1999). "Anatomical and developmental study of petrified Quercus (Fagaceae) fruits from the Middle Miocene, Yakima Canyon, Washington, USA". American Journal of Botany. 86 (3): 307–325. doi:10.2307/2656753. JSTOR 2656753. PMID 10077494. /wiki/Doi_(identifier)
Carrero, Christina; Jerome, Diana; Beckman, Emily; Byrne, Amy; Coombes, Allen J.; Deng, Min; González Rodríguez, Antonio; Sam, Hoang Van; Khoo, Eyen; Nguyen, Ngoc; Robiansyah, Iyan; Rodríguez Correa, Hernando; Sang, Julia; Song, Yi-Gang; Strijk, Joeri; Sugau, John; Sun, Weibang; Valencia-Ávalos, Susana & Westwood, Murphy (2020). The Red List of Oaks 2020 (PDF). Lisle, IL: The Morton Arboretum. Retrieved 2023-02-24. https://static1.squarespace.com/static/557dec57e4b0c3993deb6044/t/60ba66607de08b6cc5e42d00/1622828642301/RedListOaks2020.pdf
Denk, Thomas; Grimm, Guido W.; Manos, Paul S.; Deng, Min & Hipp, Andrew L. (2017). "An Updated Infrageneric Classification of the Oaks: Review of Previous Taxonomic Schemes and Synthesis of Evolutionary Patterns". In Gil-Pelegrín, Eustaquio; Peguero-Pina, José Javier & Sancho-Knapik, Domingo (eds.). Oaks Physiological Ecology. Exploring the Functional Diversity of Genus Quercus L. Cham.: Springer International Publishing. pp. 13–38. doi:10.1007/978-3-319-69099-5_2. ISBN 978-3-319-69099-5. 978-3-319-69099-5
Denk, Thomas; Grimm, Guido W.; Manos, Paul S.; Deng, Min & Hipp, Andrew L. (2017). "An Updated Infrageneric Classification of the Oaks: Review of Previous Taxonomic Schemes and Synthesis of Evolutionary Patterns". In Gil-Pelegrín, Eustaquio; Peguero-Pina, José Javier & Sancho-Knapik, Domingo (eds.). Oaks Physiological Ecology. Exploring the Functional Diversity of Genus Quercus L. Cham.: Springer International Publishing. pp. 13–38. doi:10.1007/978-3-319-69099-5_2. ISBN 978-3-319-69099-5. 978-3-319-69099-5
Kershner, Bruce, and Craig Tufts. National Wildlife Federation Field Guide to Trees of North America. New York: Sterling Pub., 2008. Print.
Denk, Thomas; Grimm, Guido W.; Manos, Paul S.; Deng, Min & Hipp, Andrew L. (2017). "An Updated Infrageneric Classification of the Oaks: Review of Previous Taxonomic Schemes and Synthesis of Evolutionary Patterns". In Gil-Pelegrín, Eustaquio; Peguero-Pina, José Javier & Sancho-Knapik, Domingo (eds.). Oaks Physiological Ecology. Exploring the Functional Diversity of Genus Quercus L. Cham.: Springer International Publishing. pp. 13–38. doi:10.1007/978-3-319-69099-5_2. ISBN 978-3-319-69099-5. 978-3-319-69099-5
Denk, Thomas; Grimm, Guido W.; Manos, Paul S.; Deng, Min & Hipp, Andrew L. (2017-11-02). "Appendix 2.1: An updated infrageneric classification of the oaks" (xls). figshare. doi:10.6084/m9.figshare.5547622.v1. Retrieved 2023-02-17. https://figshare.com/articles/dataset/Appendix_2_1_________An_updated_infrageneric_classification_of_the_oaks/5547622/1
Denk, Thomas; Grimm, Guido W.; Manos, Paul S.; Deng, Min & Hipp, Andrew L. (2017). "An Updated Infrageneric Classification of the Oaks: Review of Previous Taxonomic Schemes and Synthesis of Evolutionary Patterns". In Gil-Pelegrín, Eustaquio; Peguero-Pina, José Javier & Sancho-Knapik, Domingo (eds.). Oaks Physiological Ecology. Exploring the Functional Diversity of Genus Quercus L. Cham.: Springer International Publishing. pp. 13–38. doi:10.1007/978-3-319-69099-5_2. ISBN 978-3-319-69099-5. 978-3-319-69099-5
Denk, Thomas; Grimm, Guido W.; Manos, Paul S.; Deng, Min & Hipp, Andrew L. (2017). "An Updated Infrageneric Classification of the Oaks: Review of Previous Taxonomic Schemes and Synthesis of Evolutionary Patterns". In Gil-Pelegrín, Eustaquio; Peguero-Pina, José Javier & Sancho-Knapik, Domingo (eds.). Oaks Physiological Ecology. Exploring the Functional Diversity of Genus Quercus L. Cham.: Springer International Publishing. pp. 13–38. doi:10.1007/978-3-319-69099-5_2. ISBN 978-3-319-69099-5. 978-3-319-69099-5
Denk, Thomas; Grimm, Guido W.; Manos, Paul S.; Deng, Min & Hipp, Andrew L. (2017). "An Updated Infrageneric Classification of the Oaks: Review of Previous Taxonomic Schemes and Synthesis of Evolutionary Patterns". In Gil-Pelegrín, Eustaquio; Peguero-Pina, José Javier & Sancho-Knapik, Domingo (eds.). Oaks Physiological Ecology. Exploring the Functional Diversity of Genus Quercus L. Cham.: Springer International Publishing. pp. 13–38. doi:10.1007/978-3-319-69099-5_2. ISBN 978-3-319-69099-5. 978-3-319-69099-5
Denk, Thomas; Grimm, Guido W.; Manos, Paul S.; Deng, Min & Hipp, Andrew L. (2017). "An Updated Infrageneric Classification of the Oaks: Review of Previous Taxonomic Schemes and Synthesis of Evolutionary Patterns". In Gil-Pelegrín, Eustaquio; Peguero-Pina, José Javier & Sancho-Knapik, Domingo (eds.). Oaks Physiological Ecology. Exploring the Functional Diversity of Genus Quercus L. Cham.: Springer International Publishing. pp. 13–38. doi:10.1007/978-3-319-69099-5_2. ISBN 978-3-319-69099-5. 978-3-319-69099-5
Backs, J.R. & Ashley, M.V. (2021). "Quercus Conservation Genetics and Genomics: Past, Present, and Future". Forests. 12 (7): 882. Bibcode:2021Fore...12..882B. doi:10.3390/f12070882. /wiki/Bibcode_(identifier)
Backs, J.R. & Ashley, M.V. (2021). "Quercus Conservation Genetics and Genomics: Past, Present, and Future". Forests. 12 (7): 882. Bibcode:2021Fore...12..882B. doi:10.3390/f12070882. /wiki/Bibcode_(identifier)