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Editor's Picks

Quercus coccifera, 97 cm dbh and 15 m canopy spread
Images and insights from Ezra Barnea’s journey to Cyprus’s...
Ezra Barnea | Jun 13, 2026
Lainey Kirshberger and Ryan Silver, students at Oklahoma State University, participated in the fieldwork and will lead the genetic and epigenetic analysis under the supervision of Dr. Antonio R. Castilla.
Endangered oak Quercus hinckleyi shows strong genetic...
Website Editor | Jun 09, 2026
The current Red List status and modelled outlook for the eight Californian oak species, plus tanoak
New paper should significantly change our approach to...
Steve Potter | Jun 09, 2026

Plant Focus

Quercus orocantabrica
Roderick Cameron and Carlos Vila-Viçosa give an account of this intriguing species from northwestern Iberia with a complex taxonomic and...

Changes in the Cultivar Registration Forms

The IOS has been approved again as the International Cultivar Registration Authority (ICRA) for Quercus. The registrar duties have been divided between Ryan Russell who will take care of selections found in the Americas, and Eike Jablonski who will take care of selections found outside of the Americas. This will help ease the individual workload and has been approved by International Society for Horticultural Science (ISHS).

The new registration form is now available. There were several needed updates and those have been addressed. The new form is formatted as an editable PDF allowing registrant’s to fill out the form online, and email directly to the registrars. This makes the process easier for both registrant and registrar. The new form can be found here: http://www.internationaloaksociety.org/content/cultivar-registration-form-guideline-english. The registration help page has also been updated to reflect changes in the registration form. These changes were mostly minor, but it is recommended to use this guide as you fill out your registration form. This form can be found at the same location.

Each new form should also include at least one photo (high resolution digital is preferred) of the plant that is being proposed as a new cultivar. The registrars would also ask that this is accompanied by two sets of herbarium samples. These samples will be used as the standard for the new cultivar and will be housed at two separate herbariums. The registrant will have to mail these to one of the registrars, depending on where the selection has originated, but initially, the form and photo will be used in the registration process. Questions can be directed to registrar@internationaloaksociety.org.