Systematics Section / ASPT
Elisens, Wayne .
Madrean-Tethyan disjunctions within clades of tribe Antirrhineae (Plantaginaceae).
The monophyly of the Antirrhineae is supported consistently in molecular phylogenetic analyses, which is concordant with the occurrence of unique morphological and phytochemical characters, and its nearly uniform delimitation as a tribe or subfamily within the historical "Scrophulariaceae". Within the Antirrhineae clade, analyses of plastid and nuclear molecular markers have identified several strongly supported lineages that demonstrate New World and Old World disjunctions and are examples of a Madrean-Tethyan pattern of distribution such as the "Maurandyinae" + Asarina + Cymbalaria and Antirrhinum s. l. + Mohavea + Chaenorrhinum clades. Molecular, morphological, and genetic data indicate that these patterns reflect ancient isolation and are not the product of recent introductions or long distance dispersal events. Although several phylogenetic and biogeographic problems remain unresolved, the mapping of morphological data, geographic distribution, chromosome numbers, and cross-compatibility onto molecular trees has helped to elucidate vicariance history and reproductive and chromosomal evolution within these lineages. Analyses indicate that a Madrean-Tethyan pattern of disjunction occurs in several clades and is not restricted to the "classic" example of intercontinental disjunction observed among snapdragons (Antirrhinum s. l.).
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1 - University of Oklahoma, Botany & Microbiology and Oklahoma Biological Survey, 770 Van Vleet Oval, Norman, Oklahoma, 73019, USA
Presentation Type: Oral Paper
Location: Salon G - Austin Grand Ballroom/Hilton
Date: Wednesday, August 17th, 2005
Time: 4:00 PM