Report from the Oak ICRA checklist
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Full Name: - Quercus petraea 'Purple'

Quercus petraea 'Purple' Kelsey & Dayton Standardized Plant Names, Ed. 2, 508 (1942) nom. illegit. is a synonym of Quercus petraea 'Purpurea' H. Jäger (1865)
Infrageneric Classification
Subgenus Quercus, Section Quercus
Nomenclature Note
Superfluous renaming = Q. petraea 'Purpurea' H. Jäger (1865)