Report from the Oak ICRA checklist
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Full Name: - Quercus robur (Purple-Leaf Group) 'Nigricans'

Quercus robur (Purple-Leaf Group) 'Nigricans' C. de Vos Bered. Woordenboek, 100 (1867) as "Quercus pedunculata nigricans" Cultivar name has been accepted as Registered
Infrageneric Classification
Subgenus Quercus, Section Quercus