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The genus Colchicum L. redefined to include Androcymbium Willd. based on molecular evidence
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Evolution, Genomics and Systematics, Systematic Biology.
2007 (English)In: Taxon, ISSN 0040-0262, E-ISSN 1996-8175, Vol. 56, no 3, 872-882 p.Article in journal (Refereed) Published
Abstract [en]

A recent molecular analysis of the Colchicaceae has revealed that the genus Androcymbium is paraphyletic in relation to Colchicum and that the genus Merendera is polyphyletic. The implications of these results on the monophyly of the genera in this alliance are discussed. Two independent lineages within the paraphyletic Androcymbium are characterised by enlarged and brightly or contrastingly coloured bracts, which conceal the flowers. The tepals in these species are always cucullate. In the remaining lineages the flowers are more prominent and the tepals are mostly flat. No morphological characters can be identified that serve to diagnose the lineages in Androcymbium that are retrieved by the molecular analysis, and the only practical option is to include all species of Androcymbium within an expanded circumscription of Colchicum. The genus Colchicum in this expanded sense is defined by its short-stemmed or acaulescent habit, androecial nectaries, and 2-4-porate pollen. The necessary synonomy and new combinations are made.

Place, publisher, year, edition, pages
2007. Vol. 56, no 3, 872-882 p.
Keyword [en]
Androcymbium, Colchicum, Mediterranean, South Africa, Taxonomy
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:uu:diva-91114ISI: 000249247400022OAI: oai:DiVA.org:uu-91114DiVA: diva2:163719
Available from: 2003-11-21 Created: 2003-11-21 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Tracing History: Phylogenetic, Taxonomic, and Biogeographic Research in the Colchicum Family
Open this publication in new window or tab >>Tracing History: Phylogenetic, Taxonomic, and Biogeographic Research in the Colchicum Family
2003 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis concerns the history and the intrafamilial delimitations of the plant family Colchicaceae. A phylogeny of 73 taxa representing all genera of Colchicaceae, except the monotypic Kuntheria, is presented. The molecular analysis based on three plastid regions—the rps16 intron, the atpB-rbcL intergenic spacer, and the trnL-F region—reveal the intrafamilial classification to be in need of revision. The two tribes Iphigenieae and Uvularieae are demon-strated to be paraphyletic. The well-known genus Colchicum is shown to be nested within Androcymbium, Onixotis constitutes a grade between Neodregea and Wurmbea, and Gloriosa is intermixed with species of Littonia. Two new tribes are described, Burchardieae and Tripladenieae, and the two tribes Colchiceae and Uvularieae are emended, leaving four tribes in the family. At generic level new combinations are made in Wurmbea and Gloriosa in order to render them monophyletic. The genus Androcymbium is paraphyletic in relation to Colchicum and the latter genus is therefore expanded. An investigation of the distribution of colchicine within the expanded Colchicaceae is conducted to evaluate the potential of colchicine as a synapomorphy of the re-circumscribed family. The results demonstrate presence of colchicine in all genera previously not examined in Colchicaceae and in the genus Burchardia, earlier reported to lack colchicine. Hence, demonstrating colchicine to be a synapomorphy for the family. An attempt to date the phylogeny of the order Liliales together with a dispersal-vicariance (DIVA) analysis indicates that the split between Colchicaceae and Alstromeriaceae-Luzuriagaceae represents a vicariance event following the disintegration of the Australian-Antarctican-South American link, ~34 million years ago. Further, the DIVA analysis indicates that Colchicaceae originated in Australia, first reached Asia and North America, and later Africa, from where they expanded to Europe and also dispersed back to Australia.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2003. 33 p.
Series
Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1104-232X ; 911
Keyword
Biology, biogeography, Colchicaceae, colchicine, dating, phylogeny, taxonomy, Biologi
National Category
Biological Sciences
Identifiers
urn:nbn:se:uu:diva-3793 (URN)91-554-5814-9 (ISBN)
Public defence
2003-12-12, Lindahlsalen, EBC, Norbyvägen 18a, Uppsala, 10:00
Opponent
Supervisors
Available from: 2003-11-21 Created: 2003-11-21Bibliographically approved

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