Pleurisy root goes by a few different names, including butterfly weed, but there is no confusion as to its effects on bronchial congestion. Research has shown pleurisy root to encourage normal breathing and soothe inflammation in the respiratory tracts, making it an important ally in the battle against bronchial infection. It is also good at stimulating the immune system to combat any underlying infections and cut through congestion, making it easier to expel those bronchial secretions. Pleurisy root can be used in the form of a liquid extract.