Columbia subject headings:
Harvard subject headings:
Botany, Medical--United States.
Materia medica, Vegetable--United States.
Medicinal plants--Composition.
Medicinal plants--Physiological effect.
Medicinal plants--United States
Princeton subject headings:
Homeopathic pharmacopoeias--United States.
Materia medica, Vegetable--United States.
Medicinal plants--Composition.
Medicinal plants--Physiological effect.
Medicinal plants--United States.