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(American Journal of Botany. 2005;92:1068-1076.)
© 2005 Botanical Society of America, Inc.

Structure and Development

The evolution of unisexual flowers: morphological and functional convergence results from diverse developmental transitions1

Caroline H. Mitchell and Pamela K. Diggle2

Department of Ecology and Evolutionary Biology, University of Colorado, Boulder, Colorado 80309 USA

ABSTRACT

Unisexual flower morphology was examined within a phylogenetic context in order to identify developmental transitions associated with the multiple origins of dioecy in flowering plants. Historically, two categories of unisexual flowers have been recognized: type I flowers exhibit rudiments of the nonfunctional organ type, while type II flowers bear no vestigial sexual organs. Mapping of these flower types onto a composite phylogeny shows that type II morphology is homoplasious and has resulted from at least four distinct evolutionary developmental pathways. The historical assignment of unisexual flowers into only two morphological types has masked important developmental and evolutionary dynamics.

Key Words: character evolution • dioecy • flower development • heterochrony • homeosis • homoplasy • unisexual flowers




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M. S. Kinney, J. T. Columbus, and E. A. Friar
Unisexual flower, spikelet, and inflorescence development in monoecious/dioecious Bouteloua dimorpha (Poaceae, Chloridoideae)
Am. J. Botany, February 1, 2008; 95(2): 123 - 132.
[Abstract] [Full Text] [PDF]


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