Which tree is known as a columnar variety of European Hornbeam?

The columnar variety of the European Hornbeam is Carpinus betulus 'Fastigiata.' This particular cultivar is characterized by its upright, narrow growth habit, making it an excellent choice for tight spaces or formal landscapes where verticality is desired.

The tree maintains the hardy characteristics of the species, including its adaptability to a range of soil types and urban conditions, while the columnar form makes it distinct. Unlike the other options, which represent different species with varying growth habits and characteristics, Carpinus betulus 'Fastigiata' is specifically noted for its narrow, upright structure. This makes it a popular choice for hedges, street plantings, and as an accent feature in gardens where verticality is a design consideration.