This is a unique course about herbs because it teaches herbs, foods, plants that are available in almost every area. For example, almost everyone has dandelions in their yards and they can be used as medicine. Dr. Lucas presents the herbs/foods in Differentiation and Diagnosis (D&D) format.
That is, she tells which herbs are appropriate for each D&D but she also has organized them individually with their other functions. So you have two reference sections to use.