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Editor's Picks

Group by Sequoiadendron giganteum
IOS Tour of California, Part 1: Northern California
From Davis to Los Angeles
Chris Reynolds | Oct 30, 2024
Group photo at Otay Mountains
IOS Tour of California, Part 2: Southern California
From Los Angeles to the Otay Mountains
John Leszczynski | Oct 30, 2024
Quercus boyntonii Conservation Plan
Quercus boyntonii Conservation Action Plan
Partners at The Morton Arboretum, in collaboration with...
Website Editor | Oct 29, 2024

Plant Focus

Quercus dumosa acorn
Species Spotlight: Quercus dumosa Nutt.
Animals, plants, and fungi depend on this humble tree, but its future—and theirs—is all but certain.
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Plant Focus

Cultivar Close-up: Quercus robur 'Timuki'

By Ryan Russell | August 1, 2016
Timuki

This cultivar was selected by Raimond Cinovskis, from the Botanical Garden of the Academy of Sciences, Salapils, Latvia and was introduced by Silva Tarouca Research Institute for Landscape and Ornamental Gardening, Průhonice, Czech Republic.

Hybrid Highlight: Quercus ×heterophylla F. Michx.

By Ryan Russell | August 1, 2016
Quercus-x-heterophylla_6-Andreas Gomolka

Named in honor of one of America’s first botanists, John Bartram, Quercus ×heterophylla is known by many as Bartram’s oak.

Species Spotlight: Quercus ilicifolia Wangenh.

By Rebecca Dellinger | June 4, 2016
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Quercus ilicifolia is a little oak with a big name: bear oak. 

Species Spotlight: Quercus crassifolia Bonpl.

By Roderick Cameron | January 26, 2016

Quercus crassifolia is tree ranging in height from 4 to 15 meters, and is usually easily recognized by its leaves: stiff and leathery, glossy blackish green above, covered with a layer of pale brown hairs beneath, and with bristle-tipped teeth above the widest part of the leaf.

Species Spotlight: Quercus rotundifolia Lam.

By Website Editor | March 8, 2015
qrotundi_var_avellanae.jpg

A Mediterranean oak with a long-standing relationship with humanity.

Species Spotlight: Quercus georgiana M.A. Curtis

By Ryan Russell | November 18, 2014
Quercus georgiana

Georgia oak is known from 15 counties in Georgia and possibly small pockets in Alabama, with an unverified report in North Carolina. One of these locations is Stone Mountain, just northeast of Atlanta, GA

Species Spotlight: Quercus austrocochinchinensis Hickel & A. Camus

By Website Editor | March 4, 2014
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Propagation and reintroduction of an endangered oak: Quercus austrocochinchinensis. An article by Qian-sheng Li and Min Deng, orginally published in Oak News & Notes, Vol. 18. No. 1

Species Spotlight: Quercus pubescens Willd.

By Thierry Lamant | March 23, 2013
q_pubescens-bergerette_640.jpg

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.

A new species of oak, Quercus delgadoana

By Website Editor | July 2, 2011
novon_cover.jpg

An oak in cultivation as Quercus eugeniifolia has now been described as a new species,  Quercus delgadoana S. Valencia, Nixon & L. M. Kelly (Novon June 2011)

Pleistocene clone of Quercus palmeri Engelm.

By IOS Site Administrator | July 1, 2010
q_palmeri_peachy_600x600.jpg

The distribution of Palmer's oak (Quercus palmeri Engelm.) includes numerous isolated populations that are presumably relicts of a formerly larger range that has contracted due to spreading aridity following the end of the Pleistocene.

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