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...

Abstract Zaccheus Collins (1764-1831) was a plant collector and herbarium owner from Philadelphia. Collins was an esteemed botanist and was often consulted by a majority of botanical writers, though he never published anything himself. He was also an avid collector and his herbarium contained a nearly complete collection of the plants from the vicinity of Pennsylvania and New Jersey. His correspondents also sent him various specimens from their research in the southern states, particularly South...