Adansonia Digitata popularly known as the upside down tree, monkey bread tree, cream of tartar tree, lemonade tree can attain a height of upto 25 meters but the main stem of the baobab tree can reach a girth of up to 28 meters.
The massive cylindrical trunk resemble the root system the very reason why it is called the upside down tree.
There is a belief in many African tribes that the tree of Adansonia Digitata actually grows upside down.
Source - http://www.treefromseed.com/buy-adans...