The Common Hazel (Corylus avellana)'s a species of hazel native to Europe and western Asia, from the British Isles south to Iberia, Greece, Turkey and Cyprus, north to central Scandinavia, and east to the central Ural Mountains, the Caucasus, and northwestern Iran. Botany Common hazel's typically a shrub reaching 3-8 m tall, but can reach 15 m. The leaves are deciduous, rounded, 6-12 cm long and across, softly hairy on both surfaces, and with a double-serrate margin. The flowers are produced ve… (More on Hazelnut)