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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

Species Spotlight: Quercus acutissima subsp. kingii Menitsky

By Béatrice Chassé | October 6, 2018
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 in the west to the Pacific coast of Honshu in the east, and from northern Szechwan to central Burma, northern Thailand, and Laos in the south.

Species Spotlight: Quercus rugosa Née

By Roderick Cameron | August 15, 2018

Given its rugged beauty and hardiness, Quercus rugosa is recommended for gardens, parks, and arboreta in most regions. As it grows naturally in such an extended area and across a variety of habitats and altitudes, there is also scope for further experimentation with seed sourced from different provenances.

Cultivar Close-up: Thread and Lace

By Ryan Russell | February 15, 2018

As Co-Registrar of oak cultivars I think it’s important to periodically remind members about some of the exceptional selections of oaks that are out there in collections and nurseries. In the interest of appealing to a broader group, I thought I would select a cultivar from the Old World and one from the New.

Species Spotlight: Quercus semecarpifolia Sm.

By Website Editor | February 14, 2018

Quercus semecarpifolia, commonly known as brown oak, is the main forest-forming evergreen tree species from upper temperate to subalpine regions (2,500–3,300 m) in Western Himalaya.

Species Spotlight: Quercus hypoleucoides A. Camus

By Roderick Cameron | December 14, 2017

For this Species Spotlight we train our follow spot on an oak that is quite a star of the quercine scene: Quercus hypoleucoides (stage name: silverleaf oak). 

Cultivar Close-up: Hi-Yo Silver!

By Roderick Cameron | August 19, 2017
Q. robur 'Argentomarginata'

As we celebrate 25 years of the IOS, we take a look at oaks that have an association with silver. In a Species Spotlight Joeri Strijk describes Quercus argentata (the epithet derives from the Latin word for silver: argentum) and below are three well-known cultivars with silver associations.

Species Spotlight: Quercus argentata Korth.

By Joeri Strijk | August 16, 2017
Quercus argentata

Quercus argentata is an evergreen tropical oak native to the islands of Borneo (absent in Brunei), Sumatra, and Western Java, as well as to Peninsular Malaysia.

Species Spotlight: Quercus ithaburensis Decne.

By Jean Stephan | June 5, 2017
Quercus ithaburensis

Quercus ithaburensis Decne. is a deciduous oak species native to the East Mediterranean basin. 

Hybrid Highlight: Quercus ×hispanica Lam. - A Non-Hispanic Hybrid

By Roderick Cameron | March 30, 2017
leaf_comparison.jpg

A naturally occurring hybrid, widely adopted by the nursery trade in the form of cultivars, labors under a misnomer: there is precious little Hispanic about Quercus ×hispanica. 

Cultivar Close-up: Quercus ×bebbiana 'Taco'

By Ryan Russell | August 1, 2016
Quercus xbebbiana Taco

Found in the late 1980s by Guy Sternberg in Springfield, Illinois, this selection was noted early on for its rapid growth rate and strong central leader. 

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