Report from the Oak ICRA checklist
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Full Name: - Quercus robur 'Royal'

Quercus robur 'Royal' Kelsey & Dayton Standardized Plant Names, Ed. 2, 508 (1942) nom. illegit. is a synonym of Quercus robur (Purple-Leaf Group) 'Purpurascens' DC. (1808)
Infrageneric Classification
Subgenus Quercus, Section Quercus
Nomenclature Note
Superfluous renaming = Q. robur 'Purpurascens' DC. (1808)