Adhatoda vasica Nees (Vasaka) Family: Acanthaceae
Vasaka is evergreen gregarious, perennial herb distributed all over the plains of India and in the lower Himalayan ranges. It has long and broad leaves, light green in color having characteristic odor and bitter taste. The leaves, flowers, fruits and roots are used for treating cough, cold, chronic bronchitis and asthma. It acts as expectorant and antispasmodic.
Its principle constituents are alkaloids, chief alkaloid being vasicine.