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Abstract Detail


Systematics Section / ASPT

Keeley, Sterling C. [1], Funk, Vicki A. [2], Chan, Raymund [1], Forsman, Zac H. [3].

Long Distance Dispersal and the Position of the Australian Taxon Pleurocarpea in the tribe Vernonieae (Compositae).

The Vernonieae is one of the most geographically widespread tribes in the Compositae, the largest family of flowering plants. It is distributed from Argentina to Canada in the New World and from Madagascar to China in the Old World. There have been at least two trans-oceanic dispersal events between the New and Old Worlds and in two different directions (Keeley et al., in press). Members of the tribe are also found on oceanic island groups, such as the Hawaiian Islands, 3000 km from the nearest land mass. Pleurocarpea, a monotypic genus from Australia, has previously been unplaced and no relationships with other member of the tribe have ever been proposed. Our data show that this taxon belongs among a group of Old World species. The phylogenetic position of Pleurocarpea is best explained by a long distance dispersal event probably occurring ca. 20 MYA. This is similar to the timing suggested for long distance dispersal events in both the New and Old Worlds.


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1 - University of Hawaii, Department of Botany, 3190 Maile Way, Room 101, Honolulu, Hawaii, 96822-2279, USA
2 - Smithsonian Institution, Systematic Biology, Department Of Botany MRC 166, Po Box 37012, Washington, DC, 20013-7012, USA
3 - Univeristy of Hawaii, Biology Program, Dean Hall, Honolulu, Hawaii, 96822, USA

Keywords:
Vernonieae
long distance dispersal
Pleurocarpaea
Australia.

Presentation Type: Oral Paper:Papers for Sections
Session: CP15
Location: Lake Erie/Hilton
Date: Monday, July 9th, 2007
Time: 2:15 PM
Number: CP15006
Abstract ID:2741


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