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Quercus baloot is a drought-tolerant oak found in the drier valleys not only in Afghanistan, but also in the north of what is now Pakistan and into Kashmir; by and large it evaded introduction...
plant_a_002_type_1.jpg
Posted Sat, 2016-04-02 19:55 in Shaun Haddock's blog
It is with great sadness that I share with IOS members the news that Michael Heathcoat Amory died on the 24th of February.
Posted Sat, 2016-04-02 19:00 in James MacEwen's blog
A hybrid selected at Trompenburg Arboretum has parents that are oceans apart, yet closely related.
Posted Fri, 2016-04-01 18:23 in Trompenburg Gardens and Arboretum's blog
The IOS has been invited to view the collections of two of our members in Ireland: that of Sir Brendan Parsons, the Earl of Rosse, at Birr Castle; and that of Johnny Couchman, near Carlow. There...
Posted Thu, 2016-03-31 14:38 in Trompenburg Gardens and Arboretum's blog
Dan Keiser will be showing his IOS documentary, covering 20 years of traveling with the Oak Society, in New Richmond, Wisconsin on the 21st of February. 
Posted Mon, 2016-02-15 12:03 in Charles Snyers d'Attenhoven's blog
In some oak databases one can find a few oak names described by a certain Hansen. And in every instance there is no link to a publication whatsoever... 
Posted Sun, 2016-02-14 15:05 in Patrick Vereecke's blog
What connection could there possibly be between oaks and world cup rugby?
Posted Wed, 2015-12-02 21:33 in Roderick Cameron's blog
An article in The Economist proposes a radical approach for conservation of threatened species.
Posted Wed, 2015-12-02 20:01 in Roderick Cameron's blog
Nick Stoynoff and team organized a memorable Seed Exchange at the 8th IOS Conference.
Posted Wed, 2015-12-02 18:14 in Roderick Cameron's blog
Bob McCartney and his IOS Special Service Award were in his local newspaper, while Dirk Benoit received his Award in Belgium.
Posted Wed, 2015-12-02 17:13 in Roderick Cameron's blog
Jim Hitz designed a perfect follow up to the IOS Conference at The Morton Arboretum: three days touring varied sites in Indiana, with a foray into Michigan.
Posted Wed, 2015-12-02 01:37 in Roderick Cameron's blog
Twenty-one years to the day after the first IOS meeting took place, the Society held its 8th Conference at the same venue.
Posted Tue, 2015-12-01 19:43 in Roderick Cameron's blog

Pages

Editor's Picks

Past IOS President Allen Coombes, Curator of Scientific Collections at Puebla University Botanic Garden, discusses leaf variability in Quercus ceirpes (still image from the documentary)
A new documentary by Maricela Rodríguez Acosta
Website Editor | Feb 17, 2026
Quercus miyagii acorn and dried leaves
A rare oak endemic to the Ryukyu Islands of Japan
Elion Jam | Feb 16, 2026
A moss-covered oak (Quercus orocantabrica) in Mata de Albergaria, Peneda-Gerês National Park, Portugal  © Amit Zoran
Steve Potter reviews a new book that features oaks
Steve Potter | Feb 11, 2026

Plant Focus

Quercus canariensis in Cornwall Park, Epsom, Auckland, New Zealand, the champion specimen in New Zealand, planted in the 1920s, 27.2 m tall with a trunk diameter of 209 cm (G. Collett pers. comm. 2026)  © Gerald Collett
Antonio Lambe shares his views on this threatened oak native to Iberia and North Africa

Blogs

Quercus baloot is a drought-tolerant oak found in the drier valleys not only in Afghanistan, but also in the north of what is now Pakistan and into Kashmir; by and large it evaded introduction...
plant_a_002_type_1.jpg
Posted Sat, 2016-04-02 19:55 in Shaun Haddock's blog
It is with great sadness that I share with IOS members the news that Michael Heathcoat Amory died on the 24th of February.
Posted Sat, 2016-04-02 19:00 in James MacEwen's blog
A hybrid selected at Trompenburg Arboretum has parents that are oceans apart, yet closely related.
Posted Fri, 2016-04-01 18:23 in Trompenburg Gardens and Arboretum's blog
The IOS has been invited to view the collections of two of our members in Ireland: that of Sir Brendan Parsons, the Earl of Rosse, at Birr Castle; and that of Johnny Couchman, near Carlow. There...
Posted Thu, 2016-03-31 14:38 in Trompenburg Gardens and Arboretum's blog
Dan Keiser will be showing his IOS documentary, covering 20 years of traveling with the Oak Society, in New Richmond, Wisconsin on the 21st of February. 
Posted Mon, 2016-02-15 12:03 in Charles Snyers d'Attenhoven's blog
In some oak databases one can find a few oak names described by a certain Hansen. And in every instance there is no link to a publication whatsoever... 
Posted Sun, 2016-02-14 15:05 in Patrick Vereecke's blog
What connection could there possibly be between oaks and world cup rugby?
Posted Wed, 2015-12-02 21:33 in Roderick Cameron's blog
An article in The Economist proposes a radical approach for conservation of threatened species.
Posted Wed, 2015-12-02 20:01 in Roderick Cameron's blog
Nick Stoynoff and team organized a memorable Seed Exchange at the 8th IOS Conference.
Posted Wed, 2015-12-02 18:14 in Roderick Cameron's blog
Bob McCartney and his IOS Special Service Award were in his local newspaper, while Dirk Benoit received his Award in Belgium.
Posted Wed, 2015-12-02 17:13 in Roderick Cameron's blog
Jim Hitz designed a perfect follow up to the IOS Conference at The Morton Arboretum: three days touring varied sites in Indiana, with a foray into Michigan.
Posted Wed, 2015-12-02 01:37 in Roderick Cameron's blog
Twenty-one years to the day after the first IOS meeting took place, the Society held its 8th Conference at the same venue.
Posted Tue, 2015-12-01 19:43 in Roderick Cameron'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