FlexSlideshowBlock

Species Spotlight: Quercus orocantabrica
An intriguing species from northwestern Iberia with a complex taxonomic and nomenclatural history
Read more
Taxonomists Huddle at Harvard
The Harvard University Herbaria hosted a novel Oak Taxonomy Workshop
Read more
OC&R 2025 Appeal
The IOS has launched the 2025 Appeal for the Oak Conservation and Research Fund
Read more
Donate to Conserve Oaks!
In response to the overwhelming support of oak research and conservation expressed by our members, the IOS launched its Oak Conservation and Research Fund
Read more

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.

Subscribe to our free e-bulletin

Editor's Picks

Group photo at Harvard Herbarium

Taxonomists Huddle at Harvard

The Harvard University Herbaria hosted a novel Oak Taxonomy...

Jeannine Cavender-Bares | Apr 21, 2026

Morgan and friends in Argentina

Argentine Oak Collections through Italian Eyes

Visits to three collections of Quercus in Buenos Aires...

Morgan Santini | Apr 05, 2026

Michel Duhart and Paco Garin at Jardín Botánico Wilson, Costa Rica

In Memoriam: Michel Duhart (1923–2026)

On April 1st, the very day he turned 103, a great friend...

Francisco Garin Garcia | Apr 05, 2026

Plant Focus

Quercus orocantabrica

Species Spotlight: Quercus orocantabrica Rivas Mart., Penas, T.E.Díaz & Llamas

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

Read more

Home

Latest Articles

See More >

Read more

Figure 8 from Pasos et al. (2026) showing turnover from Quercus pyrenaica’s current suitable area to Q. suber under two climate scenarios (SSP3-7.0 and SSP5-8.5) and two time frames (2041–2070 and 2071–2100)

Iberian Oaks and Climate Change: A Research Paper

Portuguese researchers have modelled the likely range response of three species to climate change.

Read more

Webinar cover

State of the UK’s Oaks - A Report

The report brings together key information, monitors data, and reviews existing work, while identifying important evidence gaps.

Read more

Modeled distributions of temperate-zone species (Quercus robur and Q. petraea) under climatic conditions of the Last Glacial Maximum (~22,000 years before present), the Present, and future projections (2081-2100) under SSP1-2.6 and SSP5-8.5 scenarios.

Oaks and Climate Change: A New Research Paper

IOS member Elif Deniz Ülker has co-authored a paper on the likely future range of six European oaks

Latest Blog Posts

See More >

Agrilus biguttatus, commonly known as the oak splendor beetle or the two-spotted borer

Research Summaries from Forest Research

Below are some brief summaries of research reports carried out in partnership with the UK Forestry Commission’s research arm, Forest Research.

Jacqui and Tom introducing their flock of Badger Face Torwen sheep to the delights of tree browse © Amanda Jackson and Pembrokeshire Agroforestry

Not Just Planting Trees

Help sought for silvopasture research

Silent Auction in Oaxaca

Oaxaca Silent Auction Results

Over U$S 2,000 raised for student scholarships

Prof. Chen with the Special Service Award

Prof. Yueh-Fong Chen Thanks IOS for Special Service Award

After receiving his Special Service Award from the IOS, Prof.

Driven Round the Bend by Bender's Oak at Kew

Steve Potter recounts a frustrated yet rewarding hunt for the hybrid

Upcoming Events

See More >

UK Oak Open Days 2026

Sat, 2026-05-16 to Sun, 2026-05-17

The 2026 edition of the UK OODs will feature visits to two oak collections in southeastern England.

IOS Webinar #12: Flower Development and Diversity in Quercus, and Improved Methods for Rooting Cuttings of Evergreen Oaks

Thu, 2026-05-28

The IOS is pleased to announce our next virtual event, again co-hosted with the Global Conservation Consortium for Oak (GCCO)

Tour of Türkiye

Mon, 2026-09-21 to Mon, 2026-09-28

7-day journey through some of Türkiye’s diverse ecoregions

Tour of Southeast USA

Thu, 2026-10-15 to Thu, 2026-10-22

The 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

Rice University

South Carolina Botanical Garden

Featured link

Trees & Shrubs Online

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.

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

Supporting Institutional Members

Standard Institutional Members

Rice University

South Carolina Botanical Garden