You are not currently logged in.
Access JSTOR through your library or other institution:
If You Use a Screen ReaderThis content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Phylogeny of the Portulacaceous Cohort Based on ndhF Sequence Data
Wendy L. Applequist and Robert S. Wallace
Vol. 26, No. 2 (Apr. - Jun., 2001), pp. 406-419
Published by: American Society of Plant Taxonomists
Stable URL: http://www.jstor.org/stable/2666714
Page Count: 14
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Preview not available
The Portulacaceae, Basellaceae, Cactaceae, and Didiereaceae form a monophyletic group within the Caryophyllales, and evidence exists that the first may be paraphyletic if the latter three are recognized at the familial level. Several taxonomic treatments of the Portulacaceae based on morphological features have failed to produce consensus regarding infrafamilial relationships. The present paper employs sequences of the chloroplast gene ndhF to produce a molecular phylogeny of the portulacaceous cohort, focusing on the relationship among major lineages of the Portulacaceae and the three families potentially derived from within them. Results of this analysis supported two major clades within the monophyletic cohort. The first included Portulaca, Anacampseros and its relatives, much of Talinum, Talinella, and Cactaceae; the second, weakly supported, included the remaining genera of Portulacaceae, Basellaceae, and Didiereaceae. This phylogeny also showed that several generic circumscriptions remain inadequate, particularly that of Talinum sensu lato, which was polyphyletic in this analysis, and that all present classifications of the Portulacaceae include demonstrably non-monophyletic tribes.
Systematic Botany © 2001 American Society of Plant Taxonomists