Quercus robur 'Horizontalis' Kirchn.
Full name:
Quercus robur 'Horizontalis' Kirchn., in E. Petzold & G. Kirchner, Arb. Muscav., 620 (1864) as "Q. pedunculata horizontalis"
is an accepted name.
Infrageneric Classification:
Subgenus Quercus, Section Quercus