02457nas a2200157   4500008004100000245003500041210003500076260002100111300001000132520196200142653008302104100002102187700002202208700001902230856005002249       2000                        eng d00aModularity in helobial flowers0 aModularity in helobial flowers  aMelbournebCSIRO  a63-743 aWe 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.10aHelobial, flowers, development, evolution, Alismatidae, Alismataceae, monocots1 aPosluszny, Usher1 aCharlton, Alan, W1 aLes, Donald, H  uhttps://juncaginaceae.myspecies.info/node/28600394nas a2200109   4500008004100000245008600041210006900127300001200196490000700208100001900215856005000234       1988                        eng d00aBreeding systems, population structure, and evolution in hydrophilous angiosperms0 aBreeding systems population structure and evolution in hydrophil  a819-8350 v751 aLes, Donald, H  uhttps://juncaginaceae.myspecies.info/node/20200448nas a2200121   4500008004100000245010500041210006900146300001200215490000700227100001900234700002300253856005000276       1997                        eng d00aPhylogenetic Studies in Alismatidae, II: Evolution of Marine Angiosperms (Seagrasses) and Hydrophily0 aPhylogenetic Studies in Alismatidae II Evolution of Marine Angio  a443-4630 v221 aLes, Donald, H1 aCleland, Maryke, A  uhttps://juncaginaceae.myspecies.info/node/20302387nas a2200181   4500008004100000245011600041210006900157300001200226490000800238520171900246653008501965100001902050700002402069700002402093700002202117700001902139856004702158       2003                        eng d00aBiogeography of discontinuously distributed hydrophytes: a molecular appraisal of intercontinental disjunctions0 aBiogeography of discontinuously distributed hydrophytes a molecu  a917-9320 v1643 a<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>
10abiogeography, hydrophyte, aquatic plant, intercontinental disjunction, dispersal1 aLes, Donald, H1 aCrawford, Daniel, J1 aKimball, Rebecca, T1 aMoody, Michael, L1 aLandolt, Elias  uhttp://www.jstor.org/stable/10.1086/37865000496nas a2200133   4500008004100000245012000041210006900161300001200230490000600242100001900248700002200267700002300289856005000312       1993                        eng d00aPhylogenetic Studies in the Monocot Subclass Alismatidae: Evidence for a Reappraisal of the Aquatic Order Najadales0 aPhylogenetic Studies in the Monocot Subclass Alismatidae Evidenc  a304-3140 v21 aLes, Donald, H1 aGarvin, Denise, K1 aWimpee, Charles, F  uhttps://juncaginaceae.myspecies.info/node/20501945nas a2200157   4500008004100000245006700041210006600108260003000174300001200204520144500216100001901661700002201680700001601702700001901718856005001737       1995                        eng d00aSystematics of subclass Alismatidae: A synthesis of approaches0 aSystematics of subclass Alismatidae A synthesis of approaches  bRoyal Botanic Gardens Kew  a353-3773 aThe 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.1 aLes, Donald, H1 aHaynes, Robert, R1 aCutler, D F1 aHumphries, C J  uhttps://juncaginaceae.myspecies.info/node/20602199nas a2200145   4500008004100000245008600041210006900127300001200196490000700208520172300215100001901938700002201957700002401979856005002003       2005                        eng d00aPhylogeny and Systematics of Aponogeton (Aponogetonaceae): The Australian Species0 aPhylogeny and Systematics of Aponogeton Aponogetonaceae The Aust  a503-5190 v303 aAponogeton 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' 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.1 aLes, Donald, H1 aMoody, Michael, L1 aJacobs, Surrey, W L  uhttps://juncaginaceae.myspecies.info/node/20700611nas a2200169   4500008004100000245007300041210006900114300001200183490000700195653005000202653005200252100001900304700002200323700002400345700002200369856005000391       2002                        eng d00aSystematics of Seagrasses (Zosteraceae) in Australia and New Zealand0 aSystematics of Seagrasses Zosteraceae in Australia and New Zeala  a468-4840 v2710asystematics, taxonomy, ITS, trnK intron, rbcL10aZosteraceae, seagrasses, Australia, New Zealand1 aLes, Donald, H1 aMoody, Michael, L1 aJacobs, Surrey, W L1 aBayer, Randall, J  uhttps://juncaginaceae.myspecies.info/node/208