Verbatim text: Cronquist, A. and D. D. Keck. 1957. A reconstitution of the genus Machaeranthera. Brittonia 9: 231–239.
Author: Cronquist, A., Keck, D.D.
Year: 1957
Title: A reconstitution of the genus Machaeranthera
Journal: Brittonia
Volume: 9
Pages: 231–239