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

Quercus petraea 'Rubicunda' C. van Kleef, Sieboldia, 3(46): 375 (1877) as "Q. sessiliflora rubicunda" Cultivar name has been accepted as Registered
Infrageneric Classification
Subgenus Quercus, section Quercus (the white oaks)
H. J. Elwes & A. Henry, Trees of Great Britain & Ireland, 2: 293 (1907)
Main Horticultural References
The Hillier Manual of Trees & Shrubs, 7th ed. (2002) page 253 refers to 'Purpurea'
(Jacobson) North American Landscape Trees, (1996) page 557 equates with Q. petraea 'Purpurea'
The New Royal Horticultural Society Dictionary of Gardening vol. 3 (1992) page 789 treats as a synonym of Q. petraea 'Purpurea'
The Royal Horticultural Society Dictionary of Gardening, 2nd ed. vol. 4 (1956) page 1730 as Q. petraea rubicunda
(Bean) Trees & Shrubs Hardy in the British Isles, 8th ed. vol. 3 (1976) page 501