Sorbus torminalis (syn. Torminalis clusii, wild service tree), sometimes known as the chequer tree or checker tree, is a species of Sorbus native to Europe from England and Wales east to Denmark and Poland, south to northwest Africa, and southeast to southwest Asia from Asia Minor to the Caucasus and Alborz mountains.It is a medium-sized deciduous tree growing to 15–25 m tall, with a trunk up to 1.3 m diameter.