| Abstract Detail
Systematics Section / ASPT Chan, Raymund [1], Funk, Vicki A. [1]. Is the tribe Arctoteae (Compositae: Cichorioideae) monophyletic? More data, more taxa, some answers, even more questions. RECENT molecular (ITS, ndhF, trnL-F) and morphological studies in the tribe Arctoteae have provided a basic structure for its phylogeny but left several questions unanswered. Additional data (matK) and additional taxa have been added to the data matrix and the questions have been re-examined. Like the previous work this study shows that the two sub-tribes Goreteriinae and Arctotinae are strongly monophyletic from both molecular and morphological data. Also, Haplocarpha, Hirpicium, and Berkheya remain paraphyletic. Some of the problem taxa have been placed: Platycarpha is definitely not in the Arctoteae and is sister to the Vernonieae-Liabeae clade but on a long branch. Heterolepis is sister to the subtribe Arctotinae but we have not yet found morphological support for this. The Eremothamneae (Eremothamnus + Hoplophyllum) stands alone as the sister taxon to the Arctoteae-Liabeae-Vernonieae clade and so its subtribal status should be maintained. The relationship among the two subtribes and the Platycarpha-Liabeae-Vernonieae clade is unresolved and so we cannot determine if the tribe Arctoteae is monophyletic. Analysis using a variety of outgroups has produced some interesting results including some support for Platycarpha being placed separate from the Liabeae-Vernonieae clade. Additional taxa from the Vernonieae and Liabeae need to be added to the analysis to stabilize the base of the tree. Log in to add this item to your schedule
1 - National Museum of Natural History, Smithsonian Institution, Department of Botany, MRC-166, P.O. Box 37012, Washington, DC, 20013-7012, USA
Keywords: Compositae Arctoteae Chloridoideae phylogeny matK.
Presentation Type: Oral Paper:Papers for Sections Session: 74-5 Location: 120/Ayres Date: Wednesday, August 2nd, 2006 Time: 2:00 PM Abstract ID:234 |