Verbatim text: Haskins, M. L. and W. J. Hayden. 1987. Anatomy and affinities of Penthorum. Amer. J. Bot. 74: 164–177.
Author: Haskins, M.L., Hayden, W.J.
Year: 1987
Title: Anatomy and affinities of Penthorum
Journal: Amer. J. Bot
Volume: 74
Pages: 164–177