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Plant Focus

Quercus peninsularis
A Red Oak (Section Lobatae) endemic to inland ranges of northern Baja California, Mexico

New and Lesser-Known Cultivars and Two New Cultivar Groups

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Eike J. Jablonski and Ryan Russell

Published May 2020 in International Oaks No. 31: 77–88


The registrars of the International Oak Society are responsible for registering, updating and locating new selections of oaks throughout the world. The majority of these come from North America and Europe. New cultivars are selected for a variety of reasons, including fall color, unique foliage, habit, form, or fruiting characteristics. These cultivars come to us in many ways. Although some are notified to us by their originators through the registration link on the IOS website, most must be tracked down individually via the Internet, nursery catalogs, various publications and data from collections. In many cases, this work requires traveling to gather information from breeders, nurserymen or collection holders, and to collect the Standard Specimens. The registrars welcome information about new cultivars or older cultivars that have not been registered yet. Please send this either to Eike Jablonski (Eurasia and Africa) or Ryan Russell (the Americas).


ICRA, Quercus cultivars


Bean, W. 1976. Trees and Shrubs Hardy in the British Isles. 8th, revised edition. Vol III. London: John Murray.

ICNCP. 2016. International Code of Nomenclature for Cultivated Plants (9th edition). Scripta Horticulturae 18.

Jablonski, E. 2020. Bericht von der Regionalexkursion des Regionalgruppe Luxemburg-Eifel-Saarland am 29.9.2019. Ginkgoblätter 156: 53-54.

Kötz, F. 2020. Goldeiche in Wittgenstein. In Die Starken Bäume Deutschlands, edited by A. Roloff. Wiebelsheim, Germany: Quelle & Meyer Verlag.

Obdržálek, J. 2007. Nové české odrůdy dřevin. Zahradnictví, Praha 11: 38.

Russell, R. 2016. Cultivar Close-up: Quercus robur ‘Timuki’. International Oak Society website https://www.internationaloaksociety.org/content/cultivar-close-quercus-r.... Accessed January 20, 2020.