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A phylogenetically based sectional classification of Swartzia (Leguminosae-Papilionoideae)

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Abstract:

The species-rich neotropical tree genus Swartzia (Leguminosae-Papilionoideae) is a ubiquitous element in Central and South American rainforests. As such, it has been selected as a focal group in ongoing studies of the evolution and assembly of the neotropical flora, but these efforts are hindered by substantial taxonomic problems within Swartzia. The lack of a well-substantiated infrageneric classification has impeded much needed revisionary work on the genus, since the composition and limits of the various species complexes of Swartzia have not been clearly defined. A recent phylogenetic study of Swartzia with broad sampling of molecular characters and species illustrates the deficiencies of previous classifications of the genus and provides a robust phylogenetic framework for devising a new classification. Here we propose a phylogenetically based classification that places all currently recognized species of Swartzia into 15 sections. The sections, ranging in size from one to thirty-two species, are morphologically diagnosable and are hypothesized to be monophyletic. Thirteen sectional names are either entirely new or are applied at the sectional rank for the first time. A key to the sections is provided, along with sectional treatments that each include a morphological description, geographic distribution, and list of included species.

Keywords: CLASSIFICATION; FABACEAE; LEGUMINOSAE; PHYLOGENY; SWARTZIA; TAXONOMY

Document Type: Research Article

Affiliations: 1: Academy of Natural Sciences, 1900 Benjamin Franklin Parkway, Philadelphia, Pennsylvania 19103, U.S.A., The New York Botanical Garden, Bronx, New York 10458, U.S.A.;, Email: btorke@nybg.org 2: Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, DIPEO, Rua Pacheco Leão, 915, CEP 22460- 030, Rio de Janeiro, RJ, Brazil

Publication date: August 1, 2009

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