Verbatim text: Torrey, J. and A. Gray. 1838-1843. A Flora of North America. 2 vols. in 7 parts. New York, London, and Paris. Vol. 1, pp. 7-11.
Author: Torrey, J., Gray., A.
Year: 1838-1843
Title: A Flora of North America
Book volume: 2 vols
Volume: 1
Pages: 7–11