Hello there!

Pharmacognosy is the study of medicine where natural components like plants and flowers, are used to treat a disease. The term 'Pharmacognosy' was used first and foremost by C.A. Seydler, who studied medicine in Halle/Saale, Germany, and used the Analetica Pharmacognostica as the main title of his thesis in the year 1815.

I hope this answer resolves your query.