Systematics Section / ASPT
Lindqvist, Charlotte , Bendiksby, Mika , Mathiesen, Cecilie , Scheen, Anne-Cathrine , Albert, Victor A. .
Molecular phylogenetics of subfamily Lamioideae (Lamiaceae): taxonomic and biogeographic implications.
The Lamioideae comprises approximately 55 genera and 1100 species, thereby constituting a large entity within Lamiaceae. The circumscription of Lamioideae is still unclear although previous phylogenetic work based o要 cpDNA data, including relatively few taxa, has shown the segregation of the Pogostemonoideae and Lamioideae as sister lineages. However, a clear distinction based o要 morphological characters between the two subfamilies has not yet been demonstrated. To date, o要ly few molecular phylogenetic studies within Lamioideae have been published. As part of o要going investigations of lamioid mints, results from a broad molecular phylogenetic survey will be presented. Preliminary parsimony analysis based o要 trnL intron sequences shows the Pogostemonoideae to be nested inside of Lamioideae. Although not supported with jackknife analysis, the Pogostemonoideae taxa included form a monophyletic group along with the monotypic Himalayan lamioid genus Craniotome. Corroborating previous results, most of the largest genus in Lamioideae, Stachys (ca. 300 spp.), is found to be paraphyletic with respect to at least eight other genera in a large, strongly supported clade. Stachys officinalis and S. alopecuros, former members of the genus Betonica, form a monophyletic group not closely related to this Stachys sensu lato lineage. As currently circumscribed, other important genera are found to be para/polyphyletic, e.g., Leucas, Phlomis, Lamium, Otostegia, and Ballota. A close relationship between the largely African genera Leucas, Isoleucas, Leonotis, and Acrotome is supported. Phlomis consists of two separate clades following the subgeneric division into Phlomis and Phlomoides (the latter also incl. Eremostachys and Notochaete). Lamium includes L. galeobdolon and Wiedemannia, corroborating previous hypotheses. Other prominent monophyletic groups include Eurasian Galeopsis and the North American (Synandra, ((Brazoria, Warnockia), Physostegia)) clade. This survey, o要ce more taxa and additional markers are added, will have significant implications for the taxonomy and biogeography of this predominantly Eurasian subfamily.
1 - University of Oslo, Botanical Garden, Natural History Museums and Botanical Garden, P.O. Box 1172 Blindern, Oslo, NO-0318, Norway
Presentation Type: Paper
Location: Cottonwood A (Snowbird Center)
Date: Tuesday, August 3rd, 2004
Time: 10:15 AM