@proceedings {286,
	title = {Modularity in helobial flowers},
	year = {2000},
	pages = {63-74},
	publisher = {CSIRO},
	address = {Melbourne},
	abstract = {We have previously proposed that the flowers of helobial monocotyledons are derived from assemblages of primitive unisexual units. The main reason for the proposal lies in the different and partly independent developmental patterns of the periath/androecial and the gynoecial components of the flower. In many cases in the Zosterales, e.g. Triglochin, Lilaea, Potamogeton, and Scheuchzeria, there is stamen/tepal superposition: each stamen is formed above a perianth member in a way suggesting an axillary relationship, and the set of organs occur in whorls of different numbers according to the taxon. Similarly, in the Alismataceae and related families, the perianth members occur in whorls of three, and there is commonly an association between a petal and a superposed pair of stamens which develop in association with it, often from what appears to be a common primordium. Further stamens may be initiated above (some Alismataceae) or below (Hydrocleis) the firstformed stamens. In all these cases carpels are initiated in what seems initially to be a whorled pattern above the androecium, with the  numbers in a whorl corresponding to those in the perianth. However, it has been shown in Potamogeton and Ruppia that carpel positioning is more flexible and appears to operate like an ordinary phyllotactic system. The flowers can be seen as being made up of two different types of module, one being the perianth/stamen complex, and the other the carpel. We now have additional data for floral development in two genera of Alismataceae, Luronium and Wiesneria, which complement older data and seem to reinforce the concept of independence of development in the two regions. Phylogenetic analysis indicates these genera are in interesting position within Alismataceae: Luronium is near other genera showing some range of gynoecial organisation, and Wiesneria is part of a complex including Sagittaria which shows extreme variation in meristic complexity.},
	keywords = {Helobial, flowers, development, evolution, Alismatidae, Alismataceae, monocots},
	author = {Posluszny, Usher and Charlton, W. Alan and Les, Donald H.}
}
@article {202,
	title = {Breeding systems, population structure, and evolution in hydrophilous angiosperms},
	journal = {Ann. Missouri Bot. Gard.},
	volume = {75},
	year = {1988},
	pages = {819-835},
	author = {Les, Donald H.}
}
@article {203,
	title = {Phylogenetic Studies in Alismatidae, II: Evolution of Marine Angiosperms (Seagrasses) and Hydrophily},
	journal = {Systematic BotanySystematic Botany},
	volume = {22},
	number = {3},
	year = {1997},
	pages = {443-463},
	author = {Les, Donald H. and Cleland, Maryke A.}
}
@article {204,
	title = {Biogeography of discontinuously distributed hydrophytes: a molecular appraisal of intercontinental disjunctions},
	journal = {International Journal of Plant Sciences},
	volume = {164},
	number = {6},
	year = {2003},
	pages = {917-932},
	abstract = {<p>The extraordinarily wide distributional ranges of aquatic flowering plants have long stimulated phytogeographical discussion. Although aquatic plants occur rarely among the angiosperms, they represent a disproportionately large number of taxa with broad distributions including various intercontinental disjunctions that are manifest even at the species level. Throughout the nineteenth and early twentieth centuries, long-range dispersal by waterfowl was the prevailing explanation for widespread aquatic plant distributions. This explanation gradually fell into disfavor as biologists raised doubts as to the ability of waterfowl to transport propagules across the extensive transoceanic distances between the continents on which an assortment of aquatic taxa now reside. During the twentieth century, the development of biogeographical displacement theory, i.e., \&ldquo;continental drift,\&rdquo; steadily began to supplant dispersal as the preferred explanation for discontinuous angiosperm distributions. Our study assesses the dispersal/displacement hypotheses from a temporal standpoint using molecular estimates of divergence time for a diverse sample of phylogenetically related aquatic taxa that exhibit discontinuous intercontinental distributions. With few exceptions, we found divergence times that are far too recent to implicate continental drift as a major determinant of discontinuous distributions in aquatic plants. We suggest that long-distance dispersal by birds should continue to be regarded as a viable explanation for widely disjunct aquatic plant distributions, although such dispersal is likely to have involved a combination of overland as well as transoceanic migratory routes.</p>
},
	keywords = {biogeography, hydrophyte, aquatic plant, intercontinental disjunction, dispersal},
	doi = {http://dx.doi.org/10.1086/378650},
	url = {http://www.jstor.org/stable/10.1086/378650},
	author = {Les, Donald H. and Crawford, Daniel J. and Kimball, Rebecca T. and Moody, Michael L. and Landolt, Elias}
}
@article {205,
	title = {Phylogenetic Studies in the Monocot Subclass Alismatidae: Evidence for a Reappraisal of the Aquatic Order Najadales},
	journal = {Molecular Phylogenetics and Evolution},
	volume = {2},
	number = {4},
	year = {1993},
	pages = {304-314},
	author = {Les, Donald H. and Garvin, Denise K. and Wimpee, Charles F.}
}
@inbook {206,
	title = {Systematics of subclass Alismatidae: A synthesis of approaches},
	booktitle = {Monocotyledons: systematics and evolution},
	year = {1995},
	note = {1 page appendix fehlt noch - nach kopieren!!!},
	pages = {353-377},
	publisher = {Royal Botanic Gardens Kew},
	organization = {Royal Botanic Gardens Kew},
	abstract = {The study of systematic relationships in and of the monocotyledon subclass Alismatidae has incorporated comparative methods, phenetic approaches and cladistic analyses. Characters used in these analyses have included morphological, anatomical, ultrastructural, biochemical and molecular data. We review the bases and limitations of different hypotheses for relationships of the subclass to other angiosperms, and for interfamilial relationships within the group. Although cladistic analyses have provided many insights to phylogenetic relationships of Alismatidae, the homology of morphological character states in this mainly aquatic group is frequently uncertain and subject to alternative interpretations. One result is that cladistic analyses using morphological features provide equal support for considerably different hypotheses of relationships in Alismatidae. The incorporation of molecular data in cladistic analyses is a potentially powerful technique to study phylogenetic relationships of aquatic plants characterised by highly homoplasious morphological features. Former and current systematic studies consistently indicate strong support for the monophyly of subclass Alismatidae. Relationships within the subclass are less certain, although there is now much evidence to indicate a close phylogenetic relationship between the families Hydrocharitaceae and Najadaceae, and the distinctness of Ruppiaceae and Potamogetonaceae.},
	author = {Les, Donald H. and Haynes, Robert R.},
	editor = {Cutler, D.F. and Humphries, C.J.}
}
@article {207,
	title = {Phylogeny and Systematics of Aponogeton (Aponogetonaceae): The Australian Species},
	journal = {Systematic BotanySystematic Botany},
	volume = {30},
	number = {3},
	year = {2005},
	pages = {503-519},
	abstract = {Aponogeton is an important genus whose species are cultivated as ornamental aquatic plants. Although a fairly recent monograph has been published, the genus remains poorly studied systematically. We conducted a phylogenetic survey of Aponogeton that focuses on relationships among the nine native Australian species as well as their relationship to other members of the genus. Our analyses included a phylogenetic assessment of morphological characters and molecular data obtained both from chloroplast (trnK 5{\textquoteright} intron, matK) and nuclear DNA (nrITS) loci. Molecular data provided evidence of hybridization and polyploidy as well as an informative overview of interspecific relationships in the genus. Two potentially new Australian species alwo were identified by the molecular data. Combined molecular data produced a well-resolved cladogram that enabled us to evaluate previous phylogenetic hypotheses based on non-explicit methods as well as teh soundness of the existing classification of the genus. We conclude that Aponogetonaceae originated in Australia and subsequently radiated into Africa, Madagascar, and Asia, from which a secondary Australian diversification occurred resulting in a biphyletic origin of the native Australian species. A pattern of morphological distinctiveness coupled with low molecular divergence indicates relatively recent and rapid speciation of Aponogeton in Australia. Our results also demonstrate that in this group, morphological data are extremely unreliable taxonomically due to their extensive homoplasy. The phylogenetic relationships elucidated by this study provide evidence to support the establishment of two additional sections, Flavida and Viridis, which are described.},
	author = {Les, Donald H. and Moody, Michael L. and Jacobs, Surrey W.L.}
}
@article {208,
	title = {Systematics of Seagrasses (Zosteraceae) in Australia and New Zealand},
	journal = {Systematic BotanySystematic Botany},
	volume = {27},
	number = {3},
	year = {2002},
	note = {evtl. interessantes paper zitiert (Bayer 1999) zur Evolution polyploider KomplexeCTAB-Methode (Rogstad 1992)},
	pages = {468-484},
	keywords = {systematics, taxonomy, ITS, trnK intron, rbcL, Zosteraceae, seagrasses, Australia, New Zealand},
	author = {Les, Donald H. and Moody, Michael L. and Jacobs, Surrey W.L. and Bayer, Randall J.}
}
