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Abstract Detail



Systematics Section/ASPT

Feist, Mary Ann [1], Botero, Andres [1], Plunkett, Gregory [1].

The genus Tauschia and the Perennial Endemic North American Clade of Apiaceae.

The genus Tauschia occurs primarily in Mexico and the western United States, and as currently defined, includes ~30 species, making it one of the larger genera of American Apiaceae. Previous phylogenetic studies have suggested that Tauschia is polyphyletic, but these studies were focused broadly on the entire Perennial Endemic North American Apioid (PENA) clade, and thus included only a few species of Tauschia. The present study includes 19 species of Tauschia (to date) and a better representation from beyond the PENA clade. Most notably, we have sampled extensively from the Arracacia clade, a predominantly Central and South American group of umbellifers. To assess the depth and breadth of the taxonomic problems in Tauschia, we have employed two nuclear ribosomal genes (ETS, ITS) and three chloroplast regions (ndhF-rpl32, psbA-trnH, rpl32-trnL) to estimate phylogenetic relationships across these groups. Preliminary results confirm that Tauschia is grossly polyphyletic. In particular, the results suggest that species of Tauschia from the western United States fall predominantly in the PENA clade, where they are associated largely with Lomatium and Cymopterus (which themselves are also polyphyletic), while those from Mexico and Guatemala group primarily with species from the Arracacia clade.

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1 - New York Botanical Garden, Cullman Program For Molecular Systematics, 2900 Southern Blvd., Bronx, NY, 10458-5126, USA

Keywords:
Tauschia
Apiaceae
Arracacia clade
Perennial Endemic North American Apioid clade.

Presentation Type: Oral Paper:Papers for Sections
Session: 33
Location: Rosedown/Riverside Hilton
Date: Tuesday, July 30th, 2013
Time: 3:30 PM
Number: 33008
Abstract ID:735
Candidate for Awards:None


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