Verbatim text: Les, D. H. 1989. The evolution of achene morphology in Ceratophyllum (Ceratophyllaceae), IV. Summary of proposed relationships and evolutionary trends. Syst. Bot. 14: 254-262.
Author: Les, D.H.
Year: 1989
Title: The evolution of achene morphology in Ceratophyllum (Ceratophyllaceae), IV. Summary of proposed relationships and evolutionary trends
Journal: Syst. Bot
Volume: 14
Pages: 254–262