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Karl Georg Theodor Kotschy and the Kotschy Oak

kotschy_from_lack.jpg

Karl Georg Theodor Kotschy was an Austrian botanist and eminent plant explorer. He died 150 years ago in Vienna on June 11, 1866.

Vallonea or Aegilops Oaks, a Short Review

quercus_ithaburensis_native_habitat.jpg

A review of the assemblage of the oaks known as the "vallonea oaks" or "aegilops oaks" from the Eastern Mediterranean and the Levant.

Oak Red Listing Project Update

Quercus oglethorpensis seedlings, Jasper Co., Georgia, USA

In January, 2015, The Morton Arboretum launched a project in collaboration with BGCI and the IUCN/SSC Global Tree Specialist Group, which aims to complete IUCN Red List threat assessments for all of the world's oak species. 

Garry Oak Project

Garry oak along the waterfront of Oak Harbor

The newly founded Oak Harbor Garry Oak Society in Oak Harbor, Washington is committed to the stewardship of Garry oak trees through outreach, education and preservation.

Truffle-oaks in Argentina

Truffle-oaks in Espartillar, Argentina.

Where were most oaks planted in Argentina during the last three years? One might guess that it would be in one of the collections of the few quixotic quercophiles in that country, or perhaps a landscape designer with a preference for Quercus was responsible, or a particularly zealous specialist nursery.

Q. xintrogressa

This unusual hybrid was described by Paul Thomson in 1977 from a location in Lafayette County, Missouri. 

Damaged scrub oak habitat in central Florida is being restored—one acorn at a time.

For Acorns, Size Matters—and So Does Shape

Quercus lamellosa - Photo: ©Shaun Haddock

The aim of this brief essay by Francisco Vázquez is to set out the more frequently encountered morphological variations in the genus Quercus and their possible causes and/or consequences within the niche or habitat occupied by the individual plants.

Oak Red Listing Project

red_list.jpg

In collaboration with BGCI and the IUCN/SSC Global Tree Specialist GroupThe Morton Arboretum has launched a project to complete threat assessments for all of the world’s oak species for the IUCN Red List

Pages

Editor's Picks

Yoko and John planting acorns
"Japanese oaks" planted at Coventry Cathedral
Steve Potter | Dec 21, 2025
Group with Quercus macdougallii
Six days exploring Oaxaca’s oak diversity, as reported by...
Wally Wilkins | Dec 10, 2025
One of the first planted circles on Hampton Common, London, in partnership  with Orleans House Gallery 2025.  © Studio Ackroyd & Harvey
Oaks planted in circles as a continuation of the artwork...
Steve Potter | Dec 10, 2025

Plant Focus

Champion Quercus castaneifolia in Iran
Chestnut-leaf oak in habitat and in cultivation

Dendrology

Karl Georg Theodor Kotschy and the Kotschy Oak

kotschy_from_lack.jpg

Karl Georg Theodor Kotschy was an Austrian botanist and eminent plant explorer. He died 150 years ago in Vienna on June 11, 1866.

Vallonea or Aegilops Oaks, a Short Review

quercus_ithaburensis_native_habitat.jpg

A review of the assemblage of the oaks known as the "vallonea oaks" or "aegilops oaks" from the Eastern Mediterranean and the Levant.

Oak Red Listing Project Update

Quercus oglethorpensis seedlings, Jasper Co., Georgia, USA

In January, 2015, The Morton Arboretum launched a project in collaboration with BGCI and the IUCN/SSC Global Tree Specialist Group, which aims to complete IUCN Red List threat assessments for all of the world's oak species. 

Garry Oak Project

Garry oak along the waterfront of Oak Harbor

The newly founded Oak Harbor Garry Oak Society in Oak Harbor, Washington is committed to the stewardship of Garry oak trees through outreach, education and preservation.

Truffle-oaks in Argentina

Truffle-oaks in Espartillar, Argentina.

Where were most oaks planted in Argentina during the last three years? One might guess that it would be in one of the collections of the few quixotic quercophiles in that country, or perhaps a landscape designer with a preference for Quercus was responsible, or a particularly zealous specialist nursery.

Q. xintrogressa

This unusual hybrid was described by Paul Thomson in 1977 from a location in Lafayette County, Missouri. 

Damaged scrub oak habitat in central Florida is being restored—one acorn at a time.

For Acorns, Size Matters—and So Does Shape

Quercus lamellosa - Photo: ©Shaun Haddock

The aim of this brief essay by Francisco Vázquez is to set out the more frequently encountered morphological variations in the genus Quercus and their possible causes and/or consequences within the niche or habitat occupied by the individual plants.

Oak Red Listing Project

red_list.jpg

In collaboration with BGCI and the IUCN/SSC Global Tree Specialist GroupThe Morton Arboretum has launched a project to complete threat assessments for all of the world’s oak species for the IUCN Red List

Pages

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

Supporting Institutional Members

Standard Institutional Members

Rice University