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The Barva Oak

Quercus sp. Volcán Barva

Since 2012 I have traveled to Costa Rica four times, searching for acorns of some Quercus species that were not represented in the collection at Iturraran Botanical Garden. 

OACN 2017 Year in Review

The Oaks of the Americas Conservation Network (OACN) is an interdisciplinary consortium of oak experts from universities, botanic gardens, arboreta, conservation NGOs, and industry and government agencies aiming to address the research and conservation needs for oaks in the Western Hemisphere. In the short time since its founding in 2016, OACN has been able to make important progress on a number of projects and initiatives focused on oaks in the Americas. Here is a review of some of the work OACN has completed in 2017:

American Oaks Share a Common Northern Ancestor

North American oaks have a northern temperate origin and only later colonized Mexico and Central America, according to a new study. 

group_photo_original.jpg

The Morton Arboretum and the Botanic Garden at the Benemérita Universidad Autónoma de Puebla hosted a Rare Mexican Oak Taxonomy Workshop, which brought together key stakeholders and experts on Mexican oaks to discuss taxonomy and conservation.

Red List of US Oaks Published by The Morton Arboretum

US Red List Oaks

One-fourth of the United States’ oak species are now considered of conservation concern, according to data compiled by researchers at The Morton Arboretum for the latest update of the International Union for Conservation of Nature (IUCN) Red List of Threatened Species™. Sixteen species of oaks, all in the southern and western U.S., are now classified as Critically Endangered, Endangered, or Vulnerable on the IUCN Red List, with another four species deemed Near Threatened. 

First Time Ex-Situ Reproduction of Quercus insignis

Quercus insignis seedling

An acorn from a specimen of Quercus insignis growing in Hackfalls Arboretum in New Zealand germinated earlier this year.

Quercus havardii

We are currently requesting accessions data, including provenance information, from all gardens that maintain oak species. 

A Neophyte Revisits the Florida Oaks

Florida oaks

In January 2011, I made a quick visit to several natural areas in Palm Beach County, Florida while on a business trip and had my first experience with the varied oak habitats of the South Florida coast. In January 2017, I had the chance to relive the experience and revisit three of those spots – the High Ridge Scrub, Juno Dunes, and Frenchman’s Forest Natural Areas.

q_xchocha.jpg

Ever since the genus Quercus grabbed my attention, I have been amazed by the ability of oaks to hybridize easily (sometimes too easily), even when the species involved don't share habitat in the wild.

The Hills Are Alive with Oaks

Quercus sinuata

Copenhagen Hills Preserve is an ecological gem.  With its unique calcium-rich soils, it hosts a plethora of plant communities, ranging from pine forests and prairies to bottomlands and swamps.  This cornucopia of habitats is home to many rare and indigenous plants, such as purple cone flower (Echinacea purpurea), three-flowered hawthorn (Crataegus triflora), and, of course, a variety of uncommon oak species.

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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

Dendrology

The Barva Oak

Quercus sp. Volcán Barva

Since 2012 I have traveled to Costa Rica four times, searching for acorns of some Quercus species that were not represented in the collection at Iturraran Botanical Garden. 

OACN 2017 Year in Review

The Oaks of the Americas Conservation Network (OACN) is an interdisciplinary consortium of oak experts from universities, botanic gardens, arboreta, conservation NGOs, and industry and government agencies aiming to address the research and conservation needs for oaks in the Western Hemisphere. In the short time since its founding in 2016, OACN has been able to make important progress on a number of projects and initiatives focused on oaks in the Americas. Here is a review of some of the work OACN has completed in 2017:

American Oaks Share a Common Northern Ancestor

North American oaks have a northern temperate origin and only later colonized Mexico and Central America, according to a new study. 

group_photo_original.jpg

The Morton Arboretum and the Botanic Garden at the Benemérita Universidad Autónoma de Puebla hosted a Rare Mexican Oak Taxonomy Workshop, which brought together key stakeholders and experts on Mexican oaks to discuss taxonomy and conservation.

Red List of US Oaks Published by The Morton Arboretum

US Red List Oaks

One-fourth of the United States’ oak species are now considered of conservation concern, according to data compiled by researchers at The Morton Arboretum for the latest update of the International Union for Conservation of Nature (IUCN) Red List of Threatened Species™. Sixteen species of oaks, all in the southern and western U.S., are now classified as Critically Endangered, Endangered, or Vulnerable on the IUCN Red List, with another four species deemed Near Threatened. 

First Time Ex-Situ Reproduction of Quercus insignis

Quercus insignis seedling

An acorn from a specimen of Quercus insignis growing in Hackfalls Arboretum in New Zealand germinated earlier this year.

Quercus havardii

We are currently requesting accessions data, including provenance information, from all gardens that maintain oak species. 

A Neophyte Revisits the Florida Oaks

Florida oaks

In January 2011, I made a quick visit to several natural areas in Palm Beach County, Florida while on a business trip and had my first experience with the varied oak habitats of the South Florida coast. In January 2017, I had the chance to relive the experience and revisit three of those spots – the High Ridge Scrub, Juno Dunes, and Frenchman’s Forest Natural Areas.

q_xchocha.jpg

Ever since the genus Quercus grabbed my attention, I have been amazed by the ability of oaks to hybridize easily (sometimes too easily), even when the species involved don't share habitat in the wild.

The Hills Are Alive with Oaks

Quercus sinuata

Copenhagen Hills Preserve is an ecological gem.  With its unique calcium-rich soils, it hosts a plethora of plant communities, ranging from pine forests and prairies to bottomlands and swamps.  This cornucopia of habitats is home to many rare and indigenous plants, such as purple cone flower (Echinacea purpurea), three-flowered hawthorn (Crataegus triflora), and, of course, a variety of uncommon oak species.

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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