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The IOS has been approved again as the International Cultivar Registration Authority (ICRA) for Quercus.
Posted Fri, 2014-01-31 21:24 in Ryan Russell's blog
Quercus rysophylla with unusual fall color in Argentine arboretum.
Posted Fri, 2014-01-31 17:16 in Roderick Cameron's blog
Acorns in Bhutan - to be seen but not hoard(ed).
Posted Sun, 2014-01-05 16:36 in Shaun Haddock's blog
On the first weekend of November 2013 a group of oak enthusiasts congregated in Aiken, SC.
Posted Thu, 2013-11-14 11:54 in Roderick Cameron's blog
Yesterday, 22nd of September, nearly 30 oak enthusiasts gathered at Pavia nurseries, an outstanding nursery owned and run by Dirk Benoit, past IOS board member. 
Posted Mon, 2013-09-23 10:56 in Charles Snyers d'Attenhoven's blog
On your way to AIken in South Carolina this November, you might pass by Red Oak, NC. 
Posted Mon, 2013-08-12 15:49 in Charles Snyers d'Attenhoven's blog
Two oaks elected tree of the year 2013
Posted Sat, 2013-08-03 17:24 in Charles Snyers d'Attenhoven's blog
Michel Timacheff, IOS Member and photographer, came across an old oak near Villers-sur-Lesse in southern Belgium.  Its circumference is over 6 meters at BH. 
Posted Thu, 2013-05-02 11:06 in Charles Snyers d'Attenhoven's blog
Dan Hinkely will be speaking at the 2013 Annual Meeting of the Magnolia Society, next April 19th- 21st.
Posted Sun, 2013-03-03 18:34 in Charles Snyers d'Attenhoven's blog
In January 2012, the USDA Agricultural Research Service released a new edition of the American Plant Hardiness Map.  The previous edition was released in 1990.  Two new zones 12 and 13 have be
Posted Sun, 2012-09-16 11:34 in Charles Snyers d'Attenhoven's blog

Pages

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...

Blogs

The IOS has been approved again as the International Cultivar Registration Authority (ICRA) for Quercus.
Posted Fri, 2014-01-31 21:24 in Ryan Russell's blog
Quercus rysophylla with unusual fall color in Argentine arboretum.
Posted Fri, 2014-01-31 17:16 in Roderick Cameron's blog
Acorns in Bhutan - to be seen but not hoard(ed).
Posted Sun, 2014-01-05 16:36 in Shaun Haddock's blog
On the first weekend of November 2013 a group of oak enthusiasts congregated in Aiken, SC.
Posted Thu, 2013-11-14 11:54 in Roderick Cameron's blog
Yesterday, 22nd of September, nearly 30 oak enthusiasts gathered at Pavia nurseries, an outstanding nursery owned and run by Dirk Benoit, past IOS board member. 
Posted Mon, 2013-09-23 10:56 in Charles Snyers d'Attenhoven's blog
On your way to AIken in South Carolina this November, you might pass by Red Oak, NC. 
Posted Mon, 2013-08-12 15:49 in Charles Snyers d'Attenhoven's blog
Two oaks elected tree of the year 2013
Posted Sat, 2013-08-03 17:24 in Charles Snyers d'Attenhoven's blog
Michel Timacheff, IOS Member and photographer, came across an old oak near Villers-sur-Lesse in southern Belgium.  Its circumference is over 6 meters at BH. 
Posted Thu, 2013-05-02 11:06 in Charles Snyers d'Attenhoven's blog
Dan Hinkely will be speaking at the 2013 Annual Meeting of the Magnolia Society, next April 19th- 21st.
Posted Sun, 2013-03-03 18:34 in Charles Snyers d'Attenhoven's blog
In January 2012, the USDA Agricultural Research Service released a new edition of the American Plant Hardiness Map.  The previous edition was released in 1990.  Two new zones 12 and 13 have be
Posted Sun, 2012-09-16 11:34 in Charles Snyers d'Attenhoven's blog

Pages

The International Oak Society acknowledges the generous support of the following institutions:

Supporting Institutional Members

 

Standard Institutional Members

Rice University
San Diego Botanic Garden logo
San Diego Zoo Wildlife Alliance logo
South Carolina Botanical Garden

 

The Huntington
The John Fairey Garden