Verbatim text: Les, D. H. 1986. The phytogeography of Ceratophyllum demersum and C. echinatum in glaciated North America. Canad. J. Bot. 64: 498-509.
Author: Les, D.H.
Year: 1986
Title: The phytogeography of Ceratophyllum demersum and C. echinatum in glaciated North America
Journal: Canad. J. Bot
Volume: 64
Pages: 498–509