Bebb’s Hybrid Oak

Arbor Walk #145, Treekeeper ID #6550

This oak is a spontaneously occurring hybrid of the White Oak (Quercus alba) and the Bur Oak (Q. macrocarpa). Natural occurrences are found as far south as St. Louis and as far north as Ontario and Quebec, but primarily within the upper Midwest where both of these species are common. Although it is a relatively common hybrid given the prevalence of these two species, our Bebb’s Hybrid Oak is a cultivar created from a wild seedling found next to a Taco Bell restaurant, its namesake. This cultivar appears more similar to the White Oak than the Bur Oak when identifying, and is impressively resilient in its growth.

The Bebb’s Hybrid Oak is a member of the subgenus of white oaks. These oaks are distinguishable from other oaks from their smooth lobe tips (no awns), their hairless leaf undersides, and their lighter, flakier bark. The acorns of white oaks are also less tannic; in the Bebb’s Hybrid Oak, enough so to be potentially eaten raw.

Common NamesBebb’s Hybrid Oak
Latin NameQuercus x bebbiana
Indigenous Name(s)
Cultivar/Variety‘Taco’
Commercial Name
Global Distribution

Note: Distribution data in Canada is restricted to province-level. Therefore, we cannot determine distribution within Canada beyond assuming scattered distribution within Ontario and Quebec

Where to find Arbor Walk #145 on WashU campus
Our Bebb’s Hybrid Oak in space
GPS Coordinates

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Percent Concrete

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Distance to Buildings
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Distance to Other Species
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Our Bebb’s Hybrid Oak through time
Standard Measurements
YearHeight (m)DBH (cm)Crown Diameter N-S (m)Crown Diameter E-W (m)Average Crown Diameter (m)
Nests and Pests
YearDescription
How to identify a Bebb’s Hybrid Oak
Leaf Identification

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Twig and Bud Identification

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Bark Identification

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Fruit Identification

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Flower Identification

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Relationship of Quercus x bebbiana to other species in the arboretum
Additional resources on the Bebb’s Hybrid Oak