Report from the Oak ICRA checklist
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Full Name: - Quercus ambigua

Quercus ambigua Michx. (1811) is a synonym of Quercus rubra L. (1753)
Infrageneric Classification
Subgenus Quercus, Section Lobatae
Nomenclature Note
A synonym of Q. rubra L. (1753)
Main Horticultural References
The Royal Horticultural Society Dictionary of Gardening, 2nd ed. vol. 4 (1956) page 1726 treats as a synonym of Q. borealis