Systematics/Phytogeography / Taxonomie/ Section
Moore, Abigail , Baldwin, Bruce G. .
Phylogeny and biogeography of Grindelia (Asteraceae: Astereae).
Grindelia has a disjunct distribution with approximately 35 species native to western North America and Mexico and 25 species native to South America south of the tropics. The genus is distinguished from other members of the Asteraceae by having resinous involucral bracts with free, often recurved tips and a pappus of few, often early-deciduous awns. Given these synapomorphies, the generic circumscription of Grindelia has not been controversial. Within Grindelia, plants range from annuals to shrubs and occur in many different habitats, such as deserts, grasslands, openings in subalpine forest, and coastal salt marshes. We are currently using DNA sequence data from nuclear ribosomal DNA (both internal and external transcribed spacer regions) and chloroplast spacers (psaI-accD, 3’rpS16-5’trnK, and psbA-trnH) to investigate the biogeographic and evolutionary history of the genus. Current data indicate that Grindelia and North American members of the genus are each monophyletic. The two major clades of North American Grindelia are geographically distinct. Representatives from Latin America are under study to explore the precise basis for the amphitropical disjunction in the genus.
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1 - University of California Berkeley, Department of Integrative Biology, University and Jepson Herbaria, 3060 Valley Life Sciences Building, Berkeley, California, 94720, USA
2 - University of California, Berkeley, Department of Integrative Biology, University and Jepson Herbaria, 1001 Valley Life Sciences Bldg. #2465, Berkeley, California, 94720, USA
Presentation Type: Oral Paper:Papers for Sections
Date: Wednesday, July 30th, 2008
Time: 4:30 PM