Sessile Oak Pendunculate Oak
Sessile Oak: Leaf-stalks more than 12mm long. Acorns stalkless or with very short-stalks. Woods and hedges. Very frequent on acidic soils in mountainous areas.
Pendunculate Oak: Leaf-stalks less than 5mm long. Acorns with stalks more than 2cm long. Woods and hedges. Prefers richer, lowland soils.
Hybrids and back-crosses are very frequent and are intermediate in characteristics.