Verbatim text: Gleason, H. A. 1922. Centratherum. In: N. L. Britton et al., eds. 1905+. North American Flora…. 47+ vols. New York. Vol. 33, pp. 49–50.
Author: Gleason, H.A.
Year: 1922
Title: Centratherum
Editor: Britton, N.L.
Book year: 1905
Book title: North American Flora
Book volume: 47+ vols
Volume: 33
Pages: 49–50