Aspen

Aspen (Populus tremula), one of the poplars, native to the northern part of the Old World, is a tree with furrowed bark; branches somewhat pendulous; downy, reddish shoots; buds slightly viscid; leaves on very long laterally-compressed stalks, constantly quivering in the wind; and flowers in large catkins. Its wood is soft and white, and is now largely used in paper-making.