Abstract Detail

Systematics Section / ASPT

Torke, Benjamin M. [1], Schaal, Barbara [1].

A preliminary phylogeny of Swartzia (Fabaceae-Papilionoideae), based on chloroplast and nuclear sequence data.

The genus Swartzia (Fabaceae-Papilionoideae) consists of about 200 Neotropical species, which are an important component of most lowland rainforests in Central and South America. This paper presents the first phylogenetic study of the genus. Our analyses are based on chloroplast (rbcL-atpB and trnL-F spacers) and nuclear (AAT and ITS) sequence data. Taxon sampling extends to over 50 species of Swartzia, including representatives of most of the infrageneric groups recognized by previous authors. Preliminary results support the recognition of several large clades within Swartzia, corresponding to various degrees with previously recognized groups. The analyses suggest a history of evolutionary plasticity in most morphological traits, with the appearance of apetaly being a possible exception. The relationships among closely related species are discussed in the context of prevailing models of neotropical diversification.

1 - Washington University, Department of Biology, 1 Brookings Drive, Rebstock Hall, St. Louis, Missouri, 63130-4899, USA

Keywords:
Fabaceae
Papilionoideae
Swartzia
phylogeny
morphology
diversification.

Presentation Type: Paper
Session: 13-5
Location: Cottonwood C (Snowbird Center)
Date: Monday, August 2nd, 2004
Time: 12:00 PM
Abstract ID:176