Populus tremula, commonly called aspen, common aspen, Eurasian
aspen, European aspen, or quaking aspen, is a species of poplar
native to cool temperate regions of Europe and Asia, from Iceland
and the British Isles east to Kamchatka, north to inside the Arctic
Circle in Scandinavia and northern Russia, and south to central
Spain, Turkey, the Tian Shan, North Korea, and northern Japan. It
also occurs at one site in northwest Africa in Algeria. In the
south of its range, it occurs at high altitudes in mountains.