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Evolutionary relationships in Gorteria: A re-evaluation
Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
2013 (English)In: Taxon, ISSN 0040-0262, E-ISSN 1996-8175, Vol. 62, no 3, 537-549 p.Article in journal (Refereed) Published
Abstract [en]

A molecular phylogeny of the mainly South African genus Gorteria is presented for the first time, based on Bayesian inference and parsimony analyses using DNA sequences from plastid trnL-F and from nuclear ETS and ITS regions. It is shown that the genus is strongly paraphyletic in relation to one subgroup of Hirpicium, a finding that changes the prevailing generic concept and circumscription of Gorteria and Hirpicium. Furthermore, Gorteria diffusa and G. personata both seem to be polyphyletic assemblages, comprised of some more or less well diagnosed monophyletic groups with different distributions.

Place, publisher, year, edition, pages
2013. Vol. 62, no 3, 537-549 p.
Keyword [en]
Asteraceae, Gorteria, Hirpicium, molecular phylogenetics, South Africa
National Category
Botany
Research subject
Plant Systematics
Identifiers
URN: urn:nbn:se:su:diva-93134DOI: 10.12705/623.3ISI: 000322751100008OAI: oai:DiVA.org:su-93134DiVA: diva2:645115
Available from: 2013-09-03 Created: 2013-09-03 Last updated: 2017-12-06Bibliographically approved
In thesis
1. Phylogenetics and taxonomy of the Gorteria clade (Asteraceae-Arctotideae)
Open this publication in new window or tab >>Phylogenetics and taxonomy of the Gorteria clade (Asteraceae-Arctotideae)
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis deals with the systematics of the Gorteria-Gazania-Hirpicium-clade within the tribe Arctotideae-Gorteriinae in the angiosperm family Asteraceae. The group is found in southern Africa, with many representatives in the Greater Cape Floristic Region in South Africa, an area known for its high species richness and endemism. Specifically, species delimitation within Gorteria and its intergeneric relationships to Hirpicium and Gazania were investigated.

Previous phylogenetical studies showed that the two shrubby Hirpicium alienatum and H. integrifolium were more closely related to the herbaceous genus Gorteria than to remaining species of Hirpicium. During field studies additional proof of their affinity was found when these two, like Gorteria, were found to have capitulum diaspores.

Gorteria was phylogenetically investigated with a large number of samples from different populations of G. diffusa, a species showing striking variation in ray floret coloration. The study showed that the current division of the genus into three species (Gorteria corymbosa, G. diffusa and G. personata) was not supported and it was also shown that the two Hirpicium species were not sister to but nested within a paraphyletic Gorteria. The necessary nomenclatural changes were made including the new combination Gorteria alienata but left remaining species of Hirpicium unassigned to a genus because the type of Hirpicium was included in Gorteria.

When the intergeneric relationship between Gorteria, Gazania and the remaining species of Hirpicium were investigated in detail it was shown that an additional four species of Hirpicium had also evolved from an ancestor within Gorteria. The generic name Berkheyopsis was resurrected for the morphologically deviating Hirpicium echinus while a new genus, Roessleria, was described for the remaining species of Hirpicium. There was high support for a monophyletic Gazania even though the relationship among the genera was unresolved.

Place, publisher, year, edition, pages
Stockholm: Department of Ecology, Environment and Plant Sciences, Stockholm University, 2014. 34 p.
National Category
Botany
Research subject
Plant Systematics
Identifiers
urn:nbn:se:su:diva-102140 (URN)978-91-7447-896-9 (ISBN)
Public defence
2014-05-16, Lecture Hall, Department of Ecology, Environment and Plant Sciences, Lilla Frescativägen 5, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

At the time of the doctoral defense, the following paper was unpublished and had a status as follows: Paper 4: Manuscript.

 

Available from: 2014-04-24 Created: 2014-03-27 Last updated: 2014-04-14Bibliographically approved

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