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A new classification of Colchicaceae
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Evolution, Genomics and Systematics, Systematic Botany.
2007 (English)In: Taxon, ISSN 0040-0262, Vol. 56, no 1, 171-178 p.Article in journal (Refereed) Published
Abstract [en]

A recent molecular study of Colchicaceae showed four of the 19 genera and two of the five tribes to be paraphyletic. The genus Colchicum is nested within Androcymbium, Onixotis constitutes a grade between Neodregea and Wurmbea, Gloriosa is intermixed with species of Littonia, and Burchardia forms a grade sister to the rest of the family. The current classification of Colchicaceae is discussed and a revised classification is presented, based on the primary principle of monophyly. The recognition of subfamily Wurmbaeoideae for the cormous genera results in a paraphyletic Uvularioideae unless a further two or three subfamilies are recognized among the rhizomatous members of the family. This is not justified in such a small family. A revised tribal taxonomy is presented, recognizing six morphologically diagnosable, monophyletic clades at tribal level. The tribes were defined to maximize nomenclatural and taxonomic stability. Three emended tribes, Anguillarieae, Colchiceae and Iphigenieae, are recognized in the wurmbaeoid clade. The uvularioid grade is divided into Uvularicae and two new tribes, Burchardieae and Tripladenieae. The genus Burchardia is probably paraphyletic and further tribes may be required to accommodate segregates pending analysis of all species in the genus. The genera Neodregea and Onixotis are included within a widened circumscription of Wurmbea, defined by an ebracteate, spiciform inflorescence and three leaves. The genus Littonia is included within an expanded Gloriosa, distinguished by a stoloniferous corm, opposite or verticillate lower leaves, yellow to orange flowers, and more or less fleshy seeds. The necessary new combinations in these two genera are provided.

Place, publisher, year, edition, pages
2007. Vol. 56, no 1, 171-178 p.
National Category
Biological Sciences
Identifiers
URN: urn:nbn:se:uu:diva-91113ISI: 000244825300019OAI: oai:DiVA.org:uu-91113DiVA: diva2:163718
Available from: 2003-11-21 Created: 2003-11-21 Last updated: 2011-02-12Bibliographically 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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