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Abstract Detail



Systematics Section/ASPT

Stuessy, Tod F. [1], Urtubey, Estrella [2], Tremetsberger, Karin [3], Baeza, Carlos M. [4], Lopez-Sepulveda, Patricio [4], Samuel, Mary Rosabelle [5], Schneeweiss, Hanna [6], Ortiz, Maria Angeles [7], Talavera, Salvador [8].

Revision of the South American species of Hypochaeris (Compositae, Cichorieae).

The genus Hypochaeris (Compositae, Cichorieae) consists of 55 species occurring mainly in the Mediterranean region and South America. Molecular phylogenetic studies have shown that the species of South America have evolved from a progenitor from northwestern Africa approximately 1 million years ago. After long distance dispersal, the original immigrant became established as a population, dispersed into different habitats throughout temperate South America, and evolved to yield 41 total species. Isolated taxonomic investigations over the past century in separate countries, especially those independently in Chile and Argentina, have resulted in a confusion of species concepts and nomenclature. This has been exacerbated by the rapid evolutionary dynamics, whereby lineages within the genus have adaptively radiated in parallel. Similar morphological independent adaptations, therefore, have made classification especially challenging. Due to rapid evolution, nuclear or chloroplast nucleotide sequences reveal scant differences among all species of the continent. More sensitive AFLP data from these species, however, have provided the key to resolving subgeneric classification. When applied across all species, AFLPs do suggest groups that surprisingly also have good morphological and geographical unity, with a few exceptions. The new classification recognizes eight series and provides the first predictive and comprehensive treatment of the genus for the continent.


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1 - The Ohio State University, Evolution, Ecology, and Organismal Biology, Herbarium and Museum of Biological Diversity, 1315 Kinnear Road, Columbus, OH, 43212, USA
2 - Instituto de Botanica Darwinion, Herbarium, Labarden 200, San Isidro, CC 22, Argentina
3 - University of Natural Resources and Life Sciences, Integrative Biology and Biodiversity Research, Gregor-Mendel-Strasse 33, Institute of Botany, Vienna, A-1180, Austria
4 - Universidad de Concepcion, Botanica, Casilla 160-C, Concepcion, Chile
5 - University of Vienna, Dept. of Botany and Biodiversity Research, Rennweg 14, Vienna, Austria
6 - University of Vienna, Botany and Biodiversity Research, Rennweg 14, Vienna, A-1030, Austria
7 - Facultad De Biología, Apartado De Correos 1095, Sevilla, N/A, 41080, Spain
8 - Universidad de Sevilla, Biologia Vegetal y Ecologia, Apartado de Correos 1095, Sevilla, 41080, Spain

Keywords:
Asteraceae
speciation
biogeography.

Presentation Type: Oral Paper:Papers for Sections
Session: 60
Location: Salon 2/The Shaw Conference Centre
Date: Wednesday, July 29th, 2015
Time: 9:15 AM
Number: 60006
Abstract ID:276
Candidate for Awards:None


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