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Intergeneric relationships in the Gazania-Gorteria-Hirpicium clade of Arctotideae-Gorteriinae, with description of a new genus, Roessleria
Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences.
Swedish Museum of Natural History, Sweden.
(English)Manuscript (preprint) (Other academic)
Abstract [en]

Several phylogenetic studies in the Arctotideae-Gorteriinae (Asteraceae) have found support for aGazania-Gorteria-Hirpicium clade. The results have also indicated Hirpicium to be a paraphyleticgenus whereas Gorteria and Gazania have both been found to be monophyletic. Previousinvestigations at the genus level on this group have focused only on relationships in Gazania andGorteria, respectively, with only a few Hirpicium species included. In the present study we includemore taxa than in any previous investigation, including all species of Hirpicium, all species ofGorteria and virtually all taxa of Gazania. The resulting phylogenetical hypothesis, based on DNAdata from non-coding (rps16, trnL-F, and psbA-trnH) as well as coding (ndhF) regions from theplastid genome together with DNA data from the ribosomal regions (ETS and ITS) from the nucleargenome, suggests three major clades. No support for any relationships between these major cladescould be found but there is strong support for a monophyletic Gazania. The genus Hirpicium, aspresently circumscribed, is paraphyletic with one group of species nested within Gorteria while allremaining species of Hirpicium form a monophyletic group with two clades, morphologically welldefined,and with high molecular support. As the name Hirpicium is synonym of Gorteria, newnames for the remaining Hirpicium species must be proposed. For one of the Hirpicium clades wesuggest a resurrection of the genus name Berkheyopsis O.Hoffm., and for the species belonging tothe other clade a new generic name, Roessleria Stångb. & Anderb., is proposed. The necessaryrecombinations, 12 in total, are made, as well as five lectotypifications and one neotypification. Akey to the genera in their new circumscription is presented.

National Category
Botany
Research subject
Plant Systematics
Identifiers
URN: urn:nbn:se:su:diva-102138OAI: oai:DiVA.org:su-102138DiVA: diva2:708292
Available from: 2014-03-27 Created: 2014-03-27 Last updated: 2014-03-29
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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