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In Search of Quercus miyagii: A Field Report from OkinawaElion Jam tells of his trip to see this rare oak endemic to the Ryukyu Islands
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Hybrid Highlight: Surolins – Quercus suber hybrids in CataloniaÀlan Olmedo has been documenting cork oak hybrids in northeastern Spain
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Species Spotlight: Quercus canariensis Willd.Antonio Lambe shares his views on this threatened oak native to Iberia and North Africa
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OC&R 2025 AppealThe IOS has launched the 2025 Appeal for the Oak Conservation and Research Fund
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Join the IOS today!
Since 1992 the International Oak Society has been bringing together oak enthusiasts from around the world. Born from a shared desire to exchange Quercus seed, the IOS has grown in many directions. Our mission: to further the study, sustainable management, preservation, appreciation and dissemination of knowledge about the genus Quercus and its ecosystems.
To join the IOS, you first need to subscribe to The Cupule, our free e-bulletin, by clicking on the button below. Then log in using the username and password you created and you will find instructions to join the IOS on the home page.
To read about membership rates and benefits, click on "Learn More" below.
Editor's Picks
A new documentary by Maricela Rodríguez AcostaWebsite Editor | Feb 17, 2026
A rare oak endemic to the Ryukyu Islands of JapanElion Jam | Feb 16, 2026
Steve Potter reviews a new book that features oaksSteve Potter | Feb 11, 2026Plant Focus
Antonio Lambe shares his views on this threatened oak native to Iberia and North AfricaLatest Articles
IOS member Elif Deniz Ülker has co-authored a paper on the likely future range of six European oaks
A California Master Arborist and oak expert extraordinaire
The IOS received the sad news that longtime member James Harris died on 29 September 2025Latest Blog Posts
Help sought for silvopasture research
Over U$S 2,000 raised for student scholarships
After receiving his Special Service Award from the IOS, Prof.
Steve Potter recounts a frustrated yet rewarding hunt for the hybrid
Support the IOS by donating items for the Silent AuctionUpcoming Events
Sat, 2026-05-16 to Sun, 2026-05-17The 2026 edition of the UK OODs will feature visits to two oak collections in southeastern England.
Mon, 2026-09-21 to Mon, 2026-09-287-day journey through some of Türkiye’s diverse ecoregions
Thu, 2026-10-15 to Thu, 2026-10-22The Tour will focus on Georgia and Alabama, with incursions into South Carolina and northern Florida.The International Oak Society acknowledges the generous support of the following institutions:
Supporting Institutional Members
Standard Institutional Members
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Trees and Shrubs Online is a truly modern reference to temperate trees and shrubs. Currently there are articles for some 730 genera and 4,500 species, including many subspecies, forms and cultivars.User login
The International Oak Society acknowledges the generous support of the following institutions:
Supporting Institutional Members
Standard Institutional Members
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International Oak Society
909 York Street, Denver, CO 80206
United States
Contact us by email: postmaster@internationaloaksociety.org
