|The prostrate, broadly obovate, thick, glabrous joints, reach up to 4 inches wide and have 1 yellow spine in the upper greyish areoles of up
to 1 inch long, while yellow glochids cover the surface. In summer the large, pale yellow flowers are borne singly and then produce round dark red fruit. This genus has the largest membership of sun loving species. Australia has even banned a few species because of their rapid growth.