Abstract Constantine Samuel Rafinesque (1783-1840) was a naturalist who is best known for his contributions to scientific classification and nomenclature and giving Latin names to approximately 6,700 plants. While in the United States, he toured west of the Alleghenies and made important botanical discoveries in Kentucky and Illinois. This collection dates from 1818 to 1977 and consists of copies of Rafinesque's professional letters, family material, and research by F. W. Pennell regarding...