Report from the Oak ICRA checklist
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Full Name: - Quercus ×subfalcata

Quercus ×subfalcata Trel. (1917) nom. cons. prop. in prep.
Infrageneric Classification
Subgenus Quercus, section Lobatae (the red oaks)
Q. falcata Michx. × Q. phellos L.
Nomenclature Note
A later homonym of Q. subfalcata Freidrich (1883) [fossil]. nom. rejic. prop. in prep.)
Main Horticultural References
(Krüssmann) Manual of Cultivated Broad-leaved Trees & Shrubs (in English) vol. 3 (1986) page 109 refers to Q. ×ludoviciana
The New Royal Horticultural Society Dictionary of Gardening vol. 3 (1992) page 789 refers to Q. ×ludoviciana
(Bean) Trees & Shrubs Hardy in the British Isles, 8th ed. vol. 3 (1976) page 492 treats as synonym of Q. ×ludoviciana Sarg, but see note under entry