The world's shortest tree species is the Dwarf Willow (Salix herbacea). It is rare to find one more than Two and a Half inches tall. It is adapted to survive in harsh Arctic and sub-Arctic environments, and has a wide distribution on both sides of the North Atlantic, in Arctic, north-westAsia, northern Europe, Greenland and eastern Canada.
It is also found South to the Pyrenees, the Alps and the Rila in Europe, and the northern Appalachian Mountains in the eastern United States.
It grows in tundra and rocky moorland, usually at over 1,500 m altitude in the south of its range but down to sea level in the Arctic. They also have been found growing on frozen tundra in the Arctic.