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Editor's Picks

Michael Eason hiking in Anza-Borrego Desert State Park to observe Washingtonia filifera in situ
Currently at San Antonio Botanic Garden, Michael's work has...
Amy Byrne | Feb 15, 2023
An exhibition that beautifully depicts and locates oaks
Roderick Cameron | Feb 09, 2023
Burke Oak Collection at New York Botanical Garden
The Coleman and Susan Burke Oak Collection at The New York...
Todd Forrest | Feb 08, 2023

Plant Focus

Quercus xjackiana acorns
The hybrid of Q. alba and Q. bicolor

On the Hunt for Hybrids

Since oaks are rather loose with their DNA, it’s not all that uncommon to find hybrid oaks in many areas of the world. Take for example Fairview Park in Columbia, Missouri.  This is not a very large park (timber wise) and it is dominated by two species of oaks. While the lack of variety may bore some, I find it a great place to find hybrids. The two dominant species found here are shingle oak (Quercus imbricaria), and Shumard oak (Q. shumardii).  The hybrid resulting from the crossing of these species is known as Q. ×egglestonii. Described in 1924 by botanist William Trelease, Q. ×egglestonii exhibit characteristics intermediate of its parents. The acorns are a bit smaller than

Quercus ×egglestonii

shumard, but with dark striations like shingle; leaves elongated like shingle, but lobed (3-5 per side) like shumard. The fact that these two species dominate the area, make identification much easier. To date, I have found nine individual Eggleston oaks in the 30 acre park. I’m always on the lookout for new hybrids and have photographed over 30 unique hybrid oaks so far.

Quercus ×egglestonii leaves in fall Acorns smaller than Shumard oak, but with dark striations like shingle oak
Towering trunk of Quercus ×egglestonii