viscid evergreen shrub of western United States with white to deep lilac flowers; the sticky aromatic leaves are used in treating bronchial and pulmonary illnesses

GoldBamboo

... Typically, yerba santa is used as a treatment for respiratory conditions. Because it has some expectorant properties, it may be used to relieve coughs from respiratory conditions such as chronic bronchitis and colds. An expectorant helps to loosen and remove mucus from breathing passages. ...
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