Tinnea coerulea Gürke var. coerulea (Photo : SEK) The Katangan copper arc, which extends over the provinces of Upper Katanga and Lualaba in the Democratic Republic of Congo, is an area known for its numerous deposits of copper and cobalt (and other metals of economic interest). These appear on the surface in the form of hills covered by a short herbaceous vegetation constituted by a set of species particularly adapted to the high concentrations of copper and cobalt in the soil. This flora unique in the world is called the…