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Species Spotlight: Quercus vulcanica Boiss. & Heldr. ex Kotschy

By Elif Deniz Ülker | October 23, 2025
Quercus vulcanica acorn and leaves
An oak endemic to Turkey

Hybrid Highlight: Quercus ×bimundorum E.J. Palmer, the ‘Oak of Two Worlds’

By Website Editor | August 4, 2025
Quercus ×bimundorum ‘Crimschmidt’ growing in the Prairie Arboretum, Freeman, South Dakota, USA © Dirk GiseburtQuercus ×bimundorum ‘Crimschmidt’ growing in the Prairie Arboretum, Freeman, South Dakota, USA © Dirk Giseburt
A naturally occurring hybrid between Quercus robur and Q. alba.

Species Spotlight: Quercus carduchorum K.Koch

By Website Editor | April 17, 2025
Acorn of Quercus carduchorum

A rare species from the Zagros forests in Iran

Species Spotlight: Quercus kotschyana O.Schwarz

By Jean Stephan | April 5, 2025
Quercus kotschyana fruit and leaves in Jaj cedars nature reserve
A rare oak endemic to Lebanon.

Species Spotlight: Quercus persica Jaub. & Spach

By Website Editor | February 10, 2025
Quercus persica acorns

Parisa Panahi and Mehdi Pourhashemi train the follow spot on a rare Iranian oak

Species Spotlight: Quercus magnosquamata Djav.-Khoie

By Website Editor | December 10, 2024
Quercus magnosquamata acorn

A  little-known species from the northern Zagros forests of Iran

Species Spotlight: Quercus dumosa Nutt.

By Joseph Ree | August 8, 2024
Quercus dumosa acorn

Animals, plants, and fungi depend on this humble tree, but its future—and theirs—is all but certain.

Species Spotlight: Quercus peninsularis Trel.

By Roderick Cameron | June 27, 2024
Quercus peninsularis

A Red Oak (Section Lobatae) endemic to inland ranges of northern Baja California, Mexico

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Editor's Picks

Group photo at Tregrehan
UK Oak Open Days 2025: Caerhays and Tregrehan
Visits to two gardens with collections of oaks and other...
Stephen Wood | Oct 27, 2025
Special Service Award plaque
IOS Service Awards Presented at the 11th IOS Conference
Plaques presented during the Gala Dinner in Oaxaca
Roderick Cameron | Oct 26, 2025
Group photo at Oaxaca Conference
The 11th IOS Oak Conference in Oaxaca
140 participants from 20 countries attended the Triennial...
Nikola Šušić | Oct 25, 2025

Plant Focus

Quercus vulcanica acorn and leaves
Species Spotlight: Quercus vulcanica Boiss. & Heldr. ex Kotschy
An oak endemic to Turkey
Read more

Plant Focus

Species Spotlight: Quercus vulcanica Boiss. & Heldr. ex Kotschy

By Elif Deniz Ülker | October 23, 2025
Quercus vulcanica acorn and leaves
An oak endemic to Turkey

Hybrid Highlight: Quercus ×bimundorum E.J. Palmer, the ‘Oak of Two Worlds’

By Website Editor | August 4, 2025
Quercus ×bimundorum ‘Crimschmidt’ growing in the Prairie Arboretum, Freeman, South Dakota, USA © Dirk GiseburtQuercus ×bimundorum ‘Crimschmidt’ growing in the Prairie Arboretum, Freeman, South Dakota, USA © Dirk Giseburt
A naturally occurring hybrid between Quercus robur and Q. alba.

Species Spotlight: Quercus carduchorum K.Koch

By Website Editor | April 17, 2025
Acorn of Quercus carduchorum

A rare species from the Zagros forests in Iran

Species Spotlight: Quercus kotschyana O.Schwarz

By Jean Stephan | April 5, 2025
Quercus kotschyana fruit and leaves in Jaj cedars nature reserve
A rare oak endemic to Lebanon.

Species Spotlight: Quercus persica Jaub. & Spach

By Website Editor | February 10, 2025
Quercus persica acorns

Parisa Panahi and Mehdi Pourhashemi train the follow spot on a rare Iranian oak

Species Spotlight: Quercus magnosquamata Djav.-Khoie

By Website Editor | December 10, 2024
Quercus magnosquamata acorn

A  little-known species from the northern Zagros forests of Iran

Species Spotlight: Quercus dumosa Nutt.

By Joseph Ree | August 8, 2024
Quercus dumosa acorn

Animals, plants, and fungi depend on this humble tree, but its future—and theirs—is all but certain.

Species Spotlight: Quercus peninsularis Trel.

By Roderick Cameron | June 27, 2024
Quercus peninsularis

A Red Oak (Section Lobatae) endemic to inland ranges of northern Baja California, Mexico

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

Supporting Institutional Members

Denver BG Logo
The Morton Arboretum logo
San Antonio Botanical Garden logo
 

Standard Institutional Members

Bartlett Tree Experts logo
Catalina Island Conservancy logo
Forrest Keeling Nursery logo
Houston Botanic Garden logo
 
Rice University
San Diego Botanic Garden logo
San Diego Zoo Wildlife Alliance logo
The Huntington
The John Fairey Garden