Anxiety disorders are the most frequent kind of mental illness, affecting 40 million adults (18.1% of the population) in the United States (Davis et al., 2017). Anxiety disorders are characterized by persistent and excessive levels of anxiety, concern, and tension in affected individuals.

When the plants, who were friendly to man, heard what had been done by the animals, they determined to defeat their evil designs. Each tree, shrub, and herb, down even to the grasses and mosses, agreed to furnish a remedy for some one of the diseases named, and each said: “I shall appear to help man when he calls upon me in his need.” Thus did medicine originate, and the plants, every one of which has its use if we only knew it, furnish the antidote to counteract the evil wrought by the revengeful animals. When the doctor is in doubt what treatment to apply for the relief of a patient, the spirit of the plant suggests to him the proper remedy.