植物誌
Chadde, Steve W., and Steve Chadde. A Great Lakes Wetland Flora. 2nd ed. Pocketflora Press, 2002. ISBN 0-9651385-5-0
P. D. Strausbaugh and Earl L. Core. Flora of West Virginia. 2nd ed. Seneca Books Inc., 1964. ISBN 0-89092-010-9
Ann Fouler Rhoads and Timothy A. Block. The Plants of Pennsylvania. University of Pennsylvania Press, 2000. ISBN 0-8122-3535-5
Nathaniel Lord Britton and Hon. Addison Brown. An Illustrated Flora of the Northern United States and Canada. In three volumes. Dover Publications, 1913, 1970. ISBN 0-486-22642-5