Log in

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.
Read more

Plant Focus

Hybrid Highlight: Quercus ×vilmoriniana A.Camus

By Roderick Cameron | April 12, 2020
quercus_x_vilmoriniana_proce_nantes_0159.jpg

An intercontinental artificial hybrid raised at Arboretum national des Barres.

Species Spotlight: Quercus hypophaea Hayata

By Joeri Strijk | April 9, 2020
cyclobalanopsis_hypophaea_2.jpg

First described by the Japanese botanist Bunzō Hayata in 1913, Quercus hypophaea is a medium to large evergreen oak restricted to the southeastern part of Taiwan.

Species Spotlight: Quercus tarokoensis Hayata

By Joeri Strijk | February 10, 2020
7.jpg

Quercus tarokoensis (local name 太鲁阁栎 tai lu ge li, "oak of Taroko") is a fairly unknown oak species, restricted to eastern Taiwan.

Cultivar Close-Up: Quercus 'Maya' and 'Zehra'

By Ryan Russell | February 10, 2020
maya_leaves.jpg

There are a growing number of unique hybrid selections that feature Quercus rysophylla as one parent.

Hybrid Highlight: Quercus ×ludoviciana Sarg.

By Roderick Cameron | December 15, 2019
34072.jpg

Quercus ×ludoviciana is a naturally occurring oak hybrid from southeastern United States, which has flourished and attracted attention in collections worldwide. Over the years there has been some confusion regarding the hybrid’s parentage, but it is currently accepted to be a cross of Q. phellos (willow oak) and Q. pagoda (cherrybark oak).

Cultivar Close-Up: Mighty Miniatures

By Ryan Russell | August 9, 2019
quercus_robur_tromp_dwarf-003.jpg

Dwarf cultivars can be ideal for a small garden. Here are three "mini oaks". 

Hybrid Highlight: Quercus ×dysophylla Benth.

By Roderick Cameron | June 12, 2019
quercus_dysophylla_francisco_garin_4.jpg

Originally described as a species, Quercus ×dysophylla is now considered to be of hybrid origin.

Species Spotlight: Quercus look Kotschy

By Ori Fragman-Sapir | June 1, 2019
quercus_look.jpg

Quercus look is one of the least-known oaks of the arid mountains of the Middle East. It grows on Mount Hermon and in the Anti-Lebanon Mountains and Lebanon Mountains.

Hybrid Highlight: Quercus ×morehus Kellogg

By Ryan Russell | February 8, 2019

Quercus ×morehus was initially called Abram’s oak by the author Albert Kellogg in his original 1863 description and was thought to be a unique species at the time (although his description was based on a single specimen). Current taxonomy designates this as a hybrid of Q. kelloggii × wislizeni and is now known as the Oracle oak thanks to Willis Linn Jepson’s book The Silva of California, written in 1910.

Species Spotlight: Quercus douglasii Hook. & Arn.

By Zarah Wyly | February 8, 2019
qd.jpg

Quercus douglasii is an endemic California oak tree, affectionately called “the blue oak”.

Pages