Bonifacino, J. Mauricio , Funk, Vicki A. .
Unraveling the story of the Chiliotrichum group: the southern South American bushy daisies (Compositae: Astereae).
The Chiliotrichum Group sensu lato (Compositae: Astereae) is comprised of 11 genera and 31 species distributed from Colombia to Tierra del Fuego. It constitutes a diverse array of genera with very contrasting morphological traits. All species in the Chiliotrichum Group sensu stricto were evaluated and circumscribed using morphological (herbarium and field collections) as well as molecular data (ITS, ETS, and plastid trnL-trnF, rpl16, and rpl32-trnL (UAG) regions). Results showed that the Chiliotrichum group sensu lato is a strongly supported monophyletic group composed of four main clades: the Chiliotrichum clade (composed of Aylacophora, Chiliophyllum, Chiliotrichum, and Lepidophyllum), the Haroldia clade (composed of Haroldia), the Llerasia clade (composed of Llerasia and Ocyroe), and the Nardophyllum clade (composed of Cabreraea, Chiliotrichiopsis, Katinasia, and Nardophyllum). Chiliophyllum was found to be polyphyletic; this has been corrected by segregating out two species, including one in the new genus Cabreraea and adding other to Chiliotrichum. The monotypic Paleaepappus, although very distinctive morphologically, was highly nested in Nardophylllum. Nardophyllum armatum is not closely related to core Nardophyllum and it has been transferred to the recently reinstated in Ocyroe. Chiliotrichiopsis mendocina is now included in its own newly described genus, Haroldia. The morphological traits that define the Chiliotrichum group are their smooth (not alveolate) and paleate receptacles, along with the coriaceous, highly discolorous leaves and solitary heads. The group seems to have originated in central-western Argentina, with at least three dispersal events towards the north and south, and an important radiation (Llerasia) in NW South America.
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1 - Universidad de la República, Laboratorio de Botánica , Facultad de Agronomía, Av. Garzón 780, Sayago, Montevideo, CP, 12900, Uruguay
2 - National Museum of Natural History, Smithsonian Institution, Department of Botany, MRC-166, P.O. Box 37012, Washington, DC, 20013-7012, USA
Presentation Type: Oral Paper:Papers for BSA Sections
Location: Cottonwood D/Snowbird Center
Date: Wednesday, July 29th, 2009
Time: 11:00 AM