Amarula Tree. This incredibly versatile tree (think Amarula, the delicious liqueur made from its soft fruit) is central in a number of traditional African medicines (as well as a multitude of other uses). People will cut a piece of bark off the tree to make a potion to treat illnesses such as dysentery, malaria, diabetes, fever, and even snake bites. Each time a section of the bark is removed, the tree attempts to repair itself, creating these strange growth formations.