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Abstract Detail



Systematics Section/ASPT

Torke, Benjamin [1], Cardoso, Domingos [2], Chang, Hsuan [3], Chung, Kuo-Fang [4].

A preliminary phylogeny of Ormosia (Leguminosae): implications for the classification and biogeography of a trans-Pacific tropical disjunction.

Comprising approximately 150 species of trees and shrubs evenly divided between the Asian and American Tropics, Ormosia is one of the most understudied large genera of Leguminosae. In addition to its unusual distribution pattern, Ormosia is notable for its variety of dispersal syndromes, which include adaptations to facilitate both animal and water dispersal, the former associated with a hard, brightly colored seed coat that apparently mimics a nutritive aril. Phylogenetic analysis of new and pre-existing chloroplast and nuclear sequence data (matK, trnL–F, and ITS) supports the monophyly of the genus and a clade containing the sampled New World species of Ormosia. These data also suggest that the existing infrageneric classification is in need of comprehensive revision, but more sampling will be needed before this can be achieved. Sequence divergences are compatible with a hypothesis of oceanic dispersal between Asia and America during the early Miocene, thus postdating possible overland connections via the Eocene-era Boreotropics. Instances of a water-dispersal syndrome in the genus appear to be secondarily derived and may have evolved multiple times.

Broader Impacts:


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1 - The New York Botanical Garden, Department of Biology, 2900 Southern Blvd., Bronx, NY, 10458, USA
2 - Rua Dos Tororos, Apto. 604, Ed. Cantera, 2394, Bairro Lagoa Nova, Natal, Rio Grande Do Norte, N/A, 59054-550, Brazil
3 - National Taiwan University, School of Forestry and Resource Conservation, National Taiwan University, No. 1, Sec. 4, Roosevelt Road, Taipei, Taipei, 10617, Taiwan
4 - National Taiwan University, School of Forestry and Resource Conservation, No. 1, Sec. 4, Roosevelt Road, Taipei, 10617, Taiwan

Keywords:
Ormosia
Fabaceae
Leguminosae
Phylogenetics
biogeography
Taxonomy.

Presentation Type: Oral Paper:Papers for Sections
Session: 5
Location: Rosedown/Riverside Hilton
Date: Monday, July 29th, 2013
Time: 11:00 AM
Number: 5010
Abstract ID:601
Candidate for Awards:None


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