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Editor's Picks

Karl Georg Theodor Kotschy was an Austrian botanist and...
Eike Jablonski | Jun 11, 2016
Quercus grisea - Greenlee County, AZ
This article is an account of the oak field trip organized...
Charles Snyers | Sep 22, 2017
North American oaks have a northern temperate origin and...
Website Editor | Oct 12, 2017

Plant Focus

Quercus acutissima subsp. kingii
Quercus acutissima Carruth. is a species whose natural distribution covers a vast territory in East and Southeast Asia, from central Nepal...

Latest Articles

Doug McCreary
Doug McCreary, long-time member of the IOS, died earlier this year.
Rainer Lippert has always been interested in old trees. At the age of 16 he started to visit the largest trees in his home district in Germany, drawn in particular to the majestic grandeur of ancient...
It sounds like something out of science fiction, but David Cranwell has managed to create a reality where an acorn planted in New Zealand grows into 50 oaks in the Indian Himalayas.

Latest Blog Posts

Quercus humboldtii
On a recent trip to Bogotá, Colombia I was able to collect acorns from several Quercus humboldtii growing as street trees.
Quercus suber is a Mediterranean oak, but some years ago I learned it had a curious history in North America.
New IOS Theme 2018
After moving it a month ago, we now have re-looked our website, making it fully responsive.
We moved our website to A2 Hosting's data center in Michigan on Friday. The migration went very well. Unfortunately a technical incident, issues with A2's DNS Services, prevented us to go live.
Quercus depressa
I have recently been asked to write or update the oak entries for Trees and Shrubs Online. This is a project to create a truly modern reference to temperate trees and shrubs. Currently there are...

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Centenary celebrations related to the First World War (1914-1918) will be taking place throughout the 2014-2018 period, but 2015 will likely see the most important celebration in Australia and New...
A Pleistocene Clone of Palmer's Oak Persisting in Southern California The distribution of Palmer's oak (Quercus palmeri Engelm.) includes numerous isolated populations that are presumably relicts...
For upwards of twenty years I have been planting oaks at the Arboretum de la Bergerette in southwest France, during which time at least 200 species of oak have already been trialed outdoors, and...
During this early autumn week of incomparable weather, twelve members of the IOS, and three others who were guests, enjoyed a truly memorable time in northern Greece.  There were 13 men and two women...
Quercus pubescens Willd. is a species with a wide native range, found across the European continent, from Portugal to Lebanon and from Russia into Southern Germany. This oak takes its name from the...
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