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AOBPreview published online on November 2, 2007
Annals of Botany, doi:10.1093/aob/mcm279
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© The Author 2007. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Floral Development in the Tribe Cedreleae (Meliaceae, Sub-family Swietenioideae): Cedrela and Toona

Cantídio Fernando Gouvêa1, Marcelo Carnier Dornelas2,* and Adriana Pinheiro Martinelli Rodriguez1

1 Universidade de São Paulo, Centro de Energia Nuclear na Agricultura, Av. Centenário 303, CEP 13400-970, Piracicaba, SP, Brazil
2 Universidade Estadual de Campinas, Instituto de Biologia, Departamento de Fisiologia Vegetal, Cidade Universitária ‘Zeferino Vaz’, Caixa Postal 6109, CEP 13083-970, Campinas, SP, Brazil

* For correspondence. E-mail dornelas{at}unicamp.br

Received: 24 July 2007    Returned for revision: 14 September 2007    Accepted: 20 September 2007   

Background and Aims: Floral development of Cedrela and Toona, the genera comprising the basal tribe Cedreleae of the sub-family Swietenioideae of Meliaceae, is described. The focus was on three endangered, ecologically and economically important species: Cedrela fissilis, Cedrela odorata and Toona ciliata. The aims of the study were to characterize the patterns of floral development in the tribe and to establish apomorphic and plesiomorphic floral characters in relation to other taxa within the family based on the current molecular phylogeny of Meliaceae.

Methods: A detailed floral structural and developmental study was completed using both scanning electron microscopy and visualization of microtome sections with a light microscope.

Key Results: Twelve floral developmental stages were identified. The initial development of the pentamerous flowers of both Toona and Cedrela is strikingly similar. The morphological differences observed between them are due to differential patterns of organ elongation and adnation/connation occurring late in development. Additionally, the formation of functionally male and female flowers was found to occur at specific positions within the inflorescence.

Conclusions: Due to the basal position of the tribe Cedreleae in the phylogeny of Meliaceae, functionally either male or female pentamerous flowers and the presence of (at least partially) free stamens may be considered plesiomorphic traits within the family. In contrast, sympetaly and the absence of nectaries in Cedrela species are synapomorphies.

Key words: Cedrela fissilis, Cedrela odorata, floral development, morpho-anatomy, sex distribution, Toona ciliata


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