(n) much-branched subshrub with silvery leaves and small white flowers of Texas and northern Mexico; cultivated as a source of rubber, Syn. Parthenium argentatum
(n) a South American river that arises in southern Brazil and flows south to the Rio de la Plata; the northern section forms the boundary between Argentina and Brazil and the southern section forms the boundary between Argentina and Uruguay
(n) a river in central Brazil that flows generally northward (with many falls) to join the Tocantins River, Syn. Araguaya River, Araguaya, Araguaia River