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

Quercus robur 'Opaca' Schur, Oester. Bot. Wochenbl., 7: 4 (1857) Cultivar name has been accepted as Registered
Infrageneric Classification
Subgenus Quercus, section Quercus (the white oaks)
Main Horticultural References
(Krüssmann) Manual of Cultivated Broad-leaved Trees & Shrubs (in English) vol. 3 (1986) page 106 as forma opaca Schur