Ranunculales - a Basal Eudicot Perspective of Angiosperm Evolution
Endress, Peter K. .
Patterns of flower development and evolution in Ranunculales.
Ranunculales form the first step in the grade of basal eudicots and are thus sister to all other eudicots. The order exhibits an impressive diversity of floral forms, but this diversity differs in some ways from that present in other eudicots. Developmental and evolutionary aspects of the particular flower diversity within Ranunculales will be surveyed. Specifically, floral phyllotaxis, floral merism, and floral symmetry and its change during development (aspects of polysymmetry, disymmetry, monosymmetry, and asymmetry) will be addressed. The evolutionary meaning of the absence of petals or even absence of a perianth at some positions in the phylogenetic tree of Ranunculales will be discussed. A special focus will be given to Eupteleaceae, which in some recent phylogenetic analyses appear as sister to all other Ranunculales. The unusual flowers of the family have been conspicuously shaped by wind pollination and are superficially similar to the scattered wind-pollinated genera found in other Ranunculales families (Papaveraceae, Ranunculaceae). The presence of this syndrome in Eupteleaceae thus complicates the evolutionary interpretation of floral form within the order.
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1 - University of Zurich, Institute of Systematic Botany, Zollikerstrasse 107, Zurich, 8008, Switzerland
Presentation Type: Symposium or Colloquium Presentation
Location: Stevens 2/Hilton
Date: Wednesday, July 11th, 2007
Time: 1:15 PM