Jack’s Hybrid Oak

Arbor Walk #146, Treekeeper ID #6549

This oak is a naturally occurring hybrid of White Oak (Quercus alba) and Swamp White Oak (Q. bicolor). With these two species being so similar in appearance, identification in the wild can be difficult, but individuals display unique characteristics of both species. Wild populations of this hybrid are rare, but it also has landscaping popularity as a tall, spreading oak when mature.

The Jack’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.

Common NamesJack’s Hybrid Oak
Latin NameQuercus x jackiana
Indigenous Name(s)
Cultivar/Variety
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.

Where to find Arbor Walk #146 on WashU campus
Our Jack’s Hybrid Oak in space
GPS Coordinates

N/A

Percent Concrete

N/A

Distance to Buildings
YearClose Building #1Close Building #2Close Building #3
Distance to Other Species
YearClose Species #1Close Species # 2Close Species # 3
Our Jack’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
2024No obvious indications of nests or pests on this tree
How to identify a Jack’s Hybrid Oak
Leaf Identification

[description]

  • Leaf of Arbor Walk #146
  • Underside of Leaf of Arbor Walk #146
Twig and Bud Identification

[description]

  • Twig of Arbor Walk #146
  • Buds of Arbor Walk #146
  • Leaf Scar of Arbor Walk #146
Bark Identification

[description]

Fruit Identification

[description]

Flower Identification

[description]

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