Ethnobotany (from "ethnology" - study of culture and "botany" - study of plants) is the scientific study of the relationships that exist between people and plants.
Ethnobotanists aim to document, describe and explain complex relationships between cultures and (uses of) plants, focusing primarily on how plants are used, managed and perceived across human societies. This includes use for food, clothing, currency, ritual, medicine, dye, construction, cosmetics and more.
Read more about Ethnobotany: History of Ethnobotany, Modern Ethnobotany, Scientific Journals Covering Ethnobotanical Research, Ethnobotanical Database