This tree diagram shows the relationships between several groups of organisms.
The root of the current tree connects the organisms featured in this tree to their containing group and the rest of the Tree of Life. The basal branching point in the tree represents the ancestor of the other groups in the tree. This ancestor diversified over time into several descendent subgroups, which are represented as internal nodes and terminal taxa to the right.
You can click on the root to travel down the Tree of Life all the way to the root of all Life, and you can click on the names of descendent subgroups to travel up the Tree of Life all the way to individual species.
For more information on ToL tree formatting, please see Interpreting the Tree or Classification. To learn more about phylogenetic trees, please visit our Phylogenetic Biology pages.close box
Herendeen, P. S., D. H. Les, and D. L. Dilcher. 1990. Fossil Ceratophyllum (Ceratophyllaceae) from the Tertiary of North America. American Journal of Botany 77:7-16.
Les, D. H. 1988. The origin and affinities of the Ceratophyllaceae. Taxon 37:326-345.
Les, D. H. 1989. The evolution of achene morphology in Ceratophyllum (Ceratophyllaceae). IV. Summary of proposed relationships and evolutionary trends. Systematic Botany 14:254-262.
Les, D. H. 1993. Ceratophyllaceae. Pages 246-250 in: The Families and Genera of Vascular Plants. II. Flowering Plants: Dicotyledons, Magnoliid, Hamamelid and Caryophyllid Families. K. Kubitzki, J. G. Rohwer, and V. Bittrich, eds. Springer, Berlin.
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Tree of Life Web Project. 2002. Ceratophyllaceae. Version 01 January 2002 (temporary). http://tolweb.org/Ceratophyllaceae/20667/2002.01.01 in The Tree of Life Web Project, http://tolweb.org/