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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...

Dendrology

Action Oak

The Action Oak partnership was launched at this year’s Chelsea Flower Show in London last May

In October 2017, I visited Palomar Mountain State Park, San Diego County, California to collect acorns of the interior live oak, Quercus wislizeni (Section Lobatae), for an investigation of oak hybridization at that location. Following the first day on site, while reviewing the day’s leaf samples, acorns, and photographs, a chance photo with an oblique view suggested that one individual Q. wislizeni bore yellow or golden hairs on the abaxial leaf surface.

Oak Genome Reveals Facets of Long Lifespan

New research published in Nature Plants provides insights into why oaks are long lived. 

North America is home to 91 species of oak trees. Astoundingly, the various species rarely, if ever, occur alone. Where one kind of oak is found, invariably at least one more will be found. How can nature support a setup like that when it operates on the principle that only the fittest survive in any one setting?

Illinois State Museum features dwarf chinkapin oak, discovered in Illinois during an IOS Tour, as part of the Illinois Bicentennial exhibition.

Plant pathologists from the California Department of Agriculture (CDFA) recently identified a new species of fungal pathogen that infects oak, chinkapins, and tanoaks. Until recently, North American diagnosticians called all species of the genus Tubakia that infects oaks in North America, Tubakia dryina, because they all have very similar morphological features to this European fungus. However, a new study shows that the North American species vary genetically from Tubakia dryina. Among these is the newly recognized California species.

A Monument to Monumental Oaks

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 oaks. He recorded their dimensions, categorizing the giants according to the girth of their trunks. As he grew older, his range of action became wider, expanding from rural district to administrative region, then his entire native Bundesland (as German states are called), and ultimately all of Germany.

The Himalayan Oak Trust

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.

The Barva Oak

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:

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