Wild watermelon, also known as Citrullus lanatus var. citroides, is a species of watermelon that is native to Africa. Unlike the more common domesticated watermelon, wild watermelon is small and bitter, with a tough rind and small seeds. It is not typically grown for human consumption, but is instead used as a rootstock for grafting more desirable varieties of watermelon.

Wild watermelon has been used for medicinal purposes in some African cultures, and its seeds are often used in traditional medicine to treat a variety of conditions, including diabetes, high blood pressure, and urinary tract infections. However, it is important to note that more research is needed to determine the effectiveness and safety of these uses.

Overall, while wild watermelon may not be a popular food crop, it has important cultural and medicinal uses in certain parts of the world.