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

Quercus robur (Purple-Leaf Group) 'Nigra' C. de Vos Bered. Woordenboek, 100 (1867) as "Quercus pedunculata nigra" Cultivar name has been accepted as Registered
Infrageneric Classification
Subgenus Quercus, Section Quercus
Nomenclature Note
Ill: Van Houtte, Fl. des Serres, 17: 119, tab. 1783 (1868)
Synonyms in this Database
Quercus robur 'Fennessii Cupreis' Lav. (1877) nom. illegit.
Main Horticultural References
(Krüssmann) Manual of Cultivated Broad-leaved Trees & Shrubs (in English) vol. 3 (1986) page 106
The New Royal Horticultural Society Dictionary of Gardening vol. 3 (1992) page 787
The Royal Horticultural Society Dictionary of Gardening, 2nd ed. vol. 4 (1956) page 1731 as Q. Robur nigra
(Bean) Trees & Shrubs Hardy in the British Isles, 8th ed. vol. 3 (1976) page 510