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

Quercus ×helvetica Thell. (1916)
Infrageneric Classification
Subgenus Quercus, section Quercus (the white oaks)
Parentage
Q. petraea (Matt.) Liebl. × Q. pubescens Willd. × Q. robur L.
Nomenclature Note
Given as illegitimate in the World Checklist and Bibliography of Fagales (1998), which it is not. Gandoger's prior use of the name (1890) is ruled invalid being in an oppressed work (ICBN App.VI)
Natural Distribution
EUROPE: SWITZERLAND
Synonyms in this Database
Quercus ×thellungii A. Camus (1939) nom. illegit.