Guilliams, C. Matt , Baldwin, Bruce G. .
Memoirs of a Frequent Flier - Molecular Phylogenetic Evidence for Multiple Long-Distance Dispersals of Popcorn Flowers (Plagiobothrys, Boraginaceae) Between North America and South America.
Plagiobothrys (Boraginaceae) is a predominantly New World genus of annual and perennial herbs, with approximately 55 minimal-rank taxa occurring in western North America and approximately 29 in temperate South America. Fruit morphology of Plagiobothrys, critically important in most taxonomic treatments, has been studied extensively but evolution in the genus has only recently been examined using molecular techniques. Here we present further results of molecular phylogenetic study of Plagiobothrys, analyses that are based on DNA sequence data from five non-coding regions (ITS, ETS, trnL-trnF intergenic spacer, rps16 intron, and 3' trnL intron). With sampling of nearly all currently recognized taxa in Plagiobothrys and additional taxa in subtribe Cryptanthinae, we find continued support for the non-monophyly of both Plagiobothrys and Cryptantha. Three of five recognized sections within Plagiobothrys are recovered as monophyletic groups with strong support, including the predominantly vernal pool group, sect. Allocarya. Biogeographic analyses of Plagiobothrys and close relatives show a relatively large number of long-distance dispersal events from North America to South America by comparison with estimated dispersal histories for other amphitropically-distributed New World plant taxa.
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1 - University of California, Berkeley, University and Jepson Herbaria, Department of Integrative Biology, 1001 Valley Life Sciences Building #2465, Berkeley, CA, 94720, USA
2 - University Of California Berkeley, JEPSON HERB & DEPT INTEGR BIOL, 1001 Valley Life Sciences Building, MC 2465, Berkeley, CA, 94720-2465, USA
Presentation Type: Oral Paper:Papers for Sections
Location: Lindell A/Chase Park Plaza
Date: Tuesday, July 12th, 2011
Time: 9:15 AM