Report from the Oak ICRA checklist
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Full Name: - Quercus rubra var. maxima

Quercus rubra var. maxima Marshall (1785) 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
(Bailey) Manual of Cultivated Plants 2nd. ed. (1949) page 331 accepts as Q. borealis var. maxima Ashe
The Royal Horticultural Society Dictionary of Gardening, 2nd ed. vol. 4 (1956) page 1726 as Q. borealis maxima