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AOBPreview published online on November 25, 2009
Annals of Botany, doi:10.1093/aob/mcp280
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© The Author 2009. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Morphological evolution in the variable resin-producing Detarieae (Fabaceae): do morphological characters retain a phylogenetic signal?

Marie Fougère-Danezan1,2, Patrick S. Herendeen3, Stéphan Maumont4 and Anne Bruneau1,*

1 Institut de recherche en biologie végétale (Département de Sciences biologiques), Université de Montréal, 4101 Sherbrooke est, Montréal, Québec H1X 2B2, Canada
2 Chengdu Institute of Biology, Chinese Academy of Sciences, PO Box 416, Chengdu, Sichuan 610041 China
3 Chicago Botanic Garden, 1000 Lake Cook Road, Glencoe, IL 60035, USA
4 Laboratoire Évolution et Diversité Biologique, Bât. 4R3, Université Paul Sabatier, 118 Route de Narbonne, 31062 Toulouse Cedex, France

* For correspondence. E-mail anne.bruneau{at}umontreal.ca

Received: 13 January 2009    Returned for revision: 8 April 2009    Accepted: 26 October 2009   

Background and Aims: Previous molecular phylogenetic studies disagree with the informal generic-level taxonomic groups based on morphology. In this study morphological characters in the caesalpinioid clade Detarieae are evaluated within a phylogenetic framework as a means of better understanding phylogenetic relationships and morphological evolution.

Methods: Morphological characters were observed and scored for representative species of Detarieae focusing on the resin-producing genera. Phylogenetic analyses were carried out with morphological characters alone and then combined with DNA sequences.

Key Results: Despite a high level of homoplasy, morphological data support several clades corresponding to those recovered in molecular phylogenetic analyses. The more strongly supported clades are each defined by at least one morphological synapomorphy. Several characters (e.g. apetaly) previously used to define informal generic groups evolved several times independently, leading to the differences observed with the molecular phylogenetic analyses. Although floral evolution is complex in Detarieae some patterns are recovered.

Conclusions: New informal taxonomic groupings are proposed based on the present findings. Floral evolution in the diverse Detarieae clade is characterized by a repeated tendency toward zygomorphy through the reduction of lateral petals and toward complete loss of petals.

Key words: Caesalpinioideae, Detarieae, floral evolution, Leguminosae, morphology, phylogeny, resins, taxonomy


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