[Wikipedia] Africa Native, Introduced Elsewhere, Uses: It is native to Africa, where it can be found across the continent in several types of habitats. It has been introduced to many other parts of the world for use as an ornamental plant, a cover crop, and a leguminous green manure.[2] In some places it is now naturalized in the wild, for example, in parts of Indonesia, Australia, Mexico, and the United States in California, Florida, and Hawaii. (link added by Mary Ann Machi)