Some facts about the birch tree are that it belongs to the family Betulaceae, there are over 60 species of it around the world and it's a medium-sized tree that can grow between 30 and 50 feet in height. Also, the birch tree has green leaves that are oval or elliptical in shape and it produces fruit called "samara."
Eleven of the approximately 60 species of birch trees around the world are endangered, mostly due to habitat destruction and fungal infections. The birch is regarded as a pioneer species because it commonly grows in places destroyed by fire. With the proper conditions, some species can grow as high as 80 feet. The bark of the birch tree is usually white, gray, yellow, silver or black, and its leaves' edges are either single- or double-serrated. The samara fruit produced by the tree releases around one million seeds every year.
In the northern hemisphere, birch trees contribute significantly to allergies; they are responsible for 15 to 20 percent of the cases of hay fever there. The tree has a life span of 30 to 200 years depending on the species and environment. Birch is widely used for firewood, as its wood is highly flammable, even when wet.