Cercidium praecox, also known as the Chañar Brea, Brea, Breña, Palo Verde, is a leguminous tree characteristics, which is found from the Patagonia Argentina, to the Arizona desert in the United States. It is an excellent choice as a precursor species of soil. It is located on arid or semi arid, even forming stands 40 breales ) cigars. It is part of the large units of vegetation of the chaqueño Park.