Systematics Section / ASPT
Simpson, Michael , Aerne, Layla , Fay, Michael F. , Hopper, Stephen .
Phylogenetic analysis of the Haemodoraceae using morphological and molecular data and implications for classification and character evolution.
THE Haemodoraceae is a small (14 genera and ca. 100 species) family of monocotyledons distributed in Australia, South Africa, and northern South America to eastern North America. Parsimony and Bayesian phylogenetic analyses of family members were conducted using combined morphological and molecular data in order to refine our knowledge of relationships and assess character evolution in the complex. In analyses of the family as a whole, limited trnL-F sequence data (Hopper et al. 1999) and characters from morphology, anatomy, and embryology were used, with members of the Pontederiaceae, Philydraceae, and Commelinaceae placed as outgroups. These analyses strongly support the monophyly of the subfamlies Conostylidoideae and Haemodoroideae. Within the Haemodoroideae two sister clades, corresponding to taxa with inferior versus superior ovary position, were resolved with strong bootstrap support. Interrelationships among the superior-ovaried taxa were well-supported, with Xiphidium basal to clades consisting of Schiekia-Pyrrorhiza and Wachendorfia-Barberreta. The interrelationships of the genera Dilatris, Haemodorum, and Lachnanthes of the inferior-ovaried clade were unresolved. Within the Conostylidoideae, the genus Tribonanthes is basal and sister to a lineage consisting of two sister clades, one containing Anigozanthos and Macropidia, the other composed of Phlebocarya, Blancoa, and Conostylis, with all lineages well supported. An expanded analysis of the large genus Conostylis was conducted using ITS sequence data (Hopper et al. 2006) and data from morphology, palynology, and vegetative anatomy. This analysis provides more robust support for clades within Conostylis and shows correlation with some features from leaf anatomy. From these analyses an infra-familial classification of the family will be proposed and evolution of characters from studies of septal nectary anatomy, leaf anatomy, embryology, and morphology will be discussed in light of their possible adaptive significance.
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1 - San Diego State University, Department of Biology, San Diego, California, 92182-4614, USA
2 - Royal Botanic Gardens, Kew, Jodrell Laboratory, Richmond, Surrey, TW9 3AB, United Kingdom
3 - The University of Western Australia, School of Plant Biology, 35 Stirling Highway, Crawley, Western Australia, 6009, Australia
Presentation Type: Oral Paper:Papers for Sections
Date: Wednesday, August 2nd, 2006
Time: 10:45 AM