Verbatim text: Alexander, E. J. 1937. Pontederiaceae. In: N. L. Britton et al., eds. 1905+. North American Flora…. 47+ vols. New York. Vol. 19, pp. 51–60.
Author: Alexander, E.J.
Year: 1937
Title: Pontederiaceae
Editor: Britton, N.L.
Book year: 1905
Book title: North American Flora
Book volume: 47+ vols
Volume: 19
Pages: 51–60