Systematics/Phytogeography / Taxonomie/ Section
Michelangeli, Fabian A. , Morales, Maria Eugenia , David, Heriberto , Amorim, Andre , Goldenberg, Renato .
Fruit evolution and phylogenetic position of the tribe Cyphostyleae and the genus Physeterostemon within the Melastomaceae.
Melastomataceae is a mostly tropical family of 150-160 genera from 4500-5000 species. The family exhibits a wide variety of fleshy and dry fruits, ranging from the extreme forms of berries and capsules to several intermediate types such as dry berries, fleshy capsules and woody berries. Most berries (and related types) are found in taxa with partially to totally inferior ovaries, while capsules (and related types) are present in taxa with superior ovaries. However in the New World five of the close to 100 genera deviate from this pattern. Alloneuron, Allomaieta, Physeterostemon, Tateanthus, and Wurdastom all have capsular fruits derived from flowers with inferior or partially inferior ovaries. In the present study, we conducted a family wide phylogenetic analysis of ndhF and rbcL sequence data that included all three species of Physeterostemon and ten species of Cyphostyleae. Alloneuron, Allomaieta, and Wurdastom, with less than 20 species in total, form the tribe Cyphosteleae, which at times has also been included in the tribe Miconieae based on ovary position. The Cyphostyleae are resolved as monophyletic, and within a polytomy that include some New World representatives of the tribe Bertolonieae, which all have capsules derived from superior ovaries. Physeterostemon is a recently described genus with three species endemic to Eastern Brazil for which no affinities have been proposed. Physeterostemon is resolved as a monophyletic genus, sister to the also brazilian endemic Eriocnema. Eriocnema has capsular fruits derived from superior ovaries. This Eriocnema + Physeterostemon clade is sister to the large tribe Miconieae, which has berries and flowers with partially to totally inferior ovaries. Fruit evolution in the Melastomataceae will be discussed in the context of these phylogenetic results.
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1 - The New York Botanical Garden, Institute of Systematic Botany, 200th St. & Southern Blvd., Bronx, NY, 10458-5126, USA
2 - Universidad Pedagógica y Tecnológica de Colombia, Tunja, Boyaca, Colombia
3 - Universidad de Antioquia, Herbario HUA, Medellin, Antioquia, Colombia
4 - Universidade Estadual de Santa Cruz, Departamento de Ciências Biológicas, Ilhéus, Bahia, 45600-000, Brazil
5 - Universidade Federal do Parana, Curitiba, Parana, Brazil
Presentation Type: Oral Paper:Papers for Sections
Location: Room 1/Woodward
Date: Monday, July 28th, 2008
Time: 10:45 AM