@article {5688, title = {Pruning the polyphyletic genus Polyalthia (Annonaceae) and resurrecting the genus Monoon}, journal = {TaxonTaxon}, volume = {61}, number = {5}, year = {2012}, pages = {1021-1039}, abstract = {The highly polyphyletic status of the species-rich genus Polyalthia (Annonaceae) remains one of the most significant impediments to revisionary and floristic taxonomic research in the family. Although Polyalthia has recently been reduced in taxonomic scope, the remaining species in the genus still form a phylogenetically disparate and morphologically heterogeneous assemblage. We use maximum parsimony, maximum likelihood and Bayesian phylogenetic reconstructions based on chloroplast DNA sequence data (matK, rbcL, trnL-F) to show that the remaining Polyalthia species segregate into three clades: a clade sister to Miliusa; a clade that also includes all Enicosanthum and Woodiellantha species sampled, sister to Neo-uvaria; and a clade that also includes all Haplostichanthus species sampled, inferred (based on previous research) to be sister to Popowia. Diagnostic morphological and anatomical characters are evaluated for the latter two clades, and diagnostic leaf and seed characters identified. Based on these results, the generic name Monoon is resurrected for the clade that includes Enicosanthum and Woodiellantha, following the transfer of 37 species from Polyalthia s.l., 18 species from Enicosanthum and the single Woodiellantha species. The generic name Haplostichanthus is furthermore synonymised with Polyalthia s.str., necessitating nine nomenclatural changes, including six new combinations and three replacement names.}, keywords = {Annonaceae, ENICOSANTHUM, HAPLOSTICHANTHUS, MOLECULAR PHYLOGENETICS, MONOON, nomenclature, POLYALTHIA, taxonomy, WOODIELLANTHA}, author = {Xue, Bine and Su, Yvonne C. F. and Thomas, Daniel C. and Saunders, Richard M. K.} } @article {5687, title = {Further fragmentation of the polyphyletic genus Polyalthia (Annonaceae): molecular phylogenetic support for a broader delimitation of Marsypopetalum}, journal = {Systematics and BiodiversitySystematics and Biodiversity}, volume = {9}, number = {1}, year = {2011}, month = {2011/03/21}, pages = {17-26}, publisher = {Taylor \& Francis}, isbn = {1477-2000}, author = {Xue, Bine and Su, Yvonne C. F. and Mols, Johan B. and Ke{\ss}Ler, Paul J. A. and Saunders, Richard M. K.} } @article {5592, title = {An extended phylogeny of Pseuduvaria (Annonaceae) with descriptions of three new species and a reassessment of the generic status of Oreomitra}, journal = {Systematic BotanySystematic Botany}, volume = {35}, number = {1}, year = {2010}, pages = {30-39}, abstract = {Three new species of Pseuduvaria (Annonaceae) from Peninsular Thailand and Peninsular Malaysia are described and named as P. fragrans, P. gardneri, and P. glossopetala. A recent molecular phylogenetic study, based on 51 species (including P. fragrans), elucidated the evolutionary relationships within the genus. The present study includes P. gardneri and P. glossopetala in the phylogenetic analyses using maximum likelihood and Bayesian inference methods, based on five chloroplast regions (psbA-trnH spacer, trnL-F, matK, rbcL, and atpB-rbcL spacer). The new nomenclatural combination Pseuduvaria phuyensis is also validated in accordance with the phylogenetic analyses which show that Craibella phuyensis and Pseuduvaria form a well-supported monophyletic clade. The new species and new nomenclature combination bring the total number of species in Pseuduvaria to 56. The taxonomic status of the enigmatic monotypic genus Oreomitra from New Guinea is furthermore evaluated, and the name shown to be synonymous with Pseuduvaria.}, keywords = {classification, NEW GUINEA, PENINSULAR MALAYSIA, SYSTEMATICS, taxonomy, THAILAND}, author = {Su, Yvonne C. F. and Chaowasku, Tanawat and Saunders, Richard M. K.} } @article {5595, title = {Pollen structure, tetrad cohesion and pollen-connecting threads in Pseuduvaria (Annonaceae)}, journal = {Botanical Journal of the Linnean SocietyBotanical Journal of the Linnean Society}, volume = {143}, number = {1}, year = {2003}, pages = {69-78}, author = {Su, Yvonne C. F. and Saunders, Richard M. K.} } @article {5398, title = {Functional Monoecy Due to Delayed Anther Dehiscence: A Novel Mechanism in Pseuduvaria mulgraveana (Annonaceae)}, journal = {PLoS ONEPLoS ONE}, volume = {8}, number = {3}, year = {2013}, pages = {e59951}, publisher = {Public Library of Science}, abstract = {

Unlike most genera in the early-divergent angiosperm family Annonaceae, Pseuduvaria exhibits a diversity of floral sex expression. Most species are structurally andromonoecious (or possibly androdioecious), although the hermaphroditic flowers have been inferred to be functionally pistillate, with sterile staminodes. Pseuduvaria presents an ideal model for investigating the evolution of floral sex in early-divergent angiosperms, although detailed empirical studies are currently lacking. The phenology and pollination ecology of the Australian endemic species Pseuduvaria mulgraveana are studied in detail, including evaluations of floral scent chemistry, pollen viability, and floral visitors. Results showed that the flowers are pollinated by small diurnal nitidulid beetles and are protogynous. Pollen from both hermaphroditic and staminate flowers are shown to be equally viable. The structurally hermaphroditic flowers are nevertheless functionally pistillate as anther dehiscence is delayed until after petal abscission and hence after the departure of pollinators. This mechanism to achieve functional unisexuality of flowers has not previously been reported in angiosperms. It is known that protogyny is widespread amongst early-divergent angiosperms, including the Annonaceae, and is effective in preventing autogamy. Delayed anther dehiscence represents a further elaboration of this, and is effective in preventing geitonogamy since very few sexually mature flowers occur simultaneously in an individual. We highlight the necessity for field-based empirical interpretations of functional floral sex expression prior to evaluations of evolutionary processes.

}, author = {Pang, Chun-Chiu and Scharaschkin, Tanya and Su, Yvonne C. F. and Saunders, Richard M. K.} } @article {5147, title = {Reassessing the taxonomic status of two enigmatic Desmos species (Annonaceae): Morphological and molecular phylogenetic support for a new genus, Wangia}, journal = {Journal of Systematics and EvolutionJournal of Systematics and Evolution}, year = {2013}, pages = {n/a-n/a}, abstract = {The systematic position of two enigmatic Annonaceae species from China, Desmos saccopetaloides and Desmos yunnanensis, has been controversial, with both species having been transferred between several different genera within subfamilies Annonoideae and Malmeoideae. Phylogenetic analyses of eight chloroplast regions (matK, ndhF, ndhF-rpl32, psbA-trnH, rbcL, rpl32-trnL, trnL-F, and ycf1; ca. 9.2 kb, 66 taxa) unambiguously placed D. saccopetaloides in a subclade of tribe Miliuseae, nested among the genera Monoon, Neo-uvaria, Phaeanthus, Sageraea, and Stelechocarpus. This relationship was also supported by endosperm rumination patterns in the seed; other morphological characters furthermore indicated that D. saccopetaloides has closer affinities with Monoon, Neo-uvaria, and Phaeanthus rather than either Sageraea or Stelechocarpus. Desmos saccopetaloides is distinguished from these genera by its leaf-opposed inflorescences, sepaloid outer petals, saccate inner petals with basal glandular tissue, moniliform monocarps with uniseriate seeds, and rectangular disulculate pollen with two {\textquotedblleft}cryptoapertures{\textquotedblright}. On the basis of the combined molecular phylogenetic and morphological data, we propose a new genus, Wangia, to accommodate D. saccopetaloides. The molecular phylogenetic analyses furthermore indicated that Desmos yunnanensis belongs to the genus Dasymaschalon: examination of the type collections revealed that it is conspecific with Dasymaschalon obtusipetalum, although the combination Dasymaschalon yunnanense has nomenclatural priority.}, keywords = {Dasymaschalon, molecular phylogeny, morphology, Phaeanthus, taxonomy}, isbn = {1759-6831}, author = {Guo, Xing and Wang, Jing and Xue, Bine and Thomas, Daniel C. and Su, Yvonne C. F. and Tan, Yun-Hong and Saunders, Richard M. K.} } @article {4981, title = {Early evolutionary history of the flowering plant family Annonaceae: steady diversification and boreotropical geodispersal}, journal = {Journal of BiogeographyJournal of Biogeography}, volume = {38}, number = {4}, year = {2011}, pages = {664-680}, publisher = {Blackwell Publishing Ltd}, abstract = {Abstract Aim Rain forest-restricted plant families show disjunct distributions between the three major tropical regions: South America, Africa and Asia. Explaining these disjunctions has become an important challenge in biogeography. The pantropical plant family Annonaceae is used to test hypotheses that might explain diversification and distribution patterns in tropical biota: the museum hypothesis (low extinction leading to steady accumulation of species); and dispersal between Africa and Asia via Indian rafting versus boreotropical geodispersal. Location Tropics and boreotropics. Methods Molecular age estimates were calculated using a Bayesian approach based on 83\% generic sampling representing all major lineages within the family, seven chloroplast markers and two fossil calibrations. An analysis of diversification was carried out, which included lineage-through-time (LTT) plots and the calculation of diversification rates for genera and major clades. Ancestral areas were reconstructed using a maximum likelihood approach that implements the dispersal{\textendash}extinction{\textendash}cladogenesis model. Results The LTT plots indicated a constant overall rate of diversification with low extinction rates for the family during the first 80~Ma of its existence. The highest diversification rates were inferred for several young genera such as Desmopsis, Uvariopsis and Unonopsis. A boreotropical migration route was supported over Indian rafting as the best fitting hypothesis to explain present-day distribution patterns within the family. Main conclusions Early diversification within Annonaceae fits the hypothesis of a museum model of tropical diversification, with an overall steady increase in lineages possibly due to low extinction rates. The present-day distribution of species within the two largest clades of Annonaceae is the result of two contrasting biogeographic histories. The {\textquoteleft}long-branch clade{\textquoteright} has been diversifying since the beginning of the Cenozoic and underwent numerous geodispersals via the boreotropics and several more recent long-distance dispersal events. In contrast, the {\textquoteleft}short-branch clade{\textquoteright} dispersed once into Asia via the boreotropics during the Early Miocene and further dispersal was limited.}, keywords = {Biogeographic hypothesis testing, boreotropical hypothesis, diversification rates, Indian rafting, K/Pg boundary, LTT plots, molecular dating, museum model}, isbn = {1365-2699}, author = {Couvreur, Thomas L. P. and Pirie, Michael D. and Chatrou, Lars W. and Saunders, Richard M. K. and Su, Yvonne C. F. and Richardson, James E. and Erkens, Roy H. J.} } @article {692, title = {Pruning the polyphyletic genus Polyalthia (Annonaceae) and resurrecting the genus Monoon}, journal = {Taxon}, volume = {65}, year = {2012}, chapter = {1021-1039}, url = {http://www.ingentaconnect.com/content/iapt/tax/2012/00000061/00000005/art00009}, author = {Xue, Bine and Su, Yvonne C. F. and Thomas, Daniel C. and Saunders, Richard M. K.} } @article {600, title = {Molecular phylogenetics of Uvaria (Annonaceae): relationships with Balonga, Dasoclema and Australian species of Melodorum}, journal = {Botanical Journal of the Linnean Society}, volume = {163}, number = {1}, year = {2010}, pages = {33-43}, publisher = {Blackwell Publishing Ltd}, abstract = {An extended molecular phylogenetic analysis of Uvaria (Annonaceae) is presented, using maximum parsimony, maximum likelihood and Bayesian methods, based on sequences of four plastid DNA regions (matK, psbA-trnH spacer, rbcL and trnL-F). The additional taxa include the monotypic West African genus Balonga, the monotypic South-East Asian genus Dasoclema and seven Australian representatives of the genus Melodorum. The results indicate that all of these taxa are nested within a well-supported clade otherwise consisting of Uvaria species, indicating that their taxonomic treatment needs to be reassessed. The distinguishing morphological characteristics of the taxa are re-evaluated and interpreted as specialized adaptations of the basic Uvaria structure. The genus Uvaria is accordingly extended following the transfer of these species, necessitating six new nomenclatural combinations and two replacement names.~{\textcopyright} 2010 The Linnean Society of London, Botanical Journal of the Linnean Society, 2010, 163, 33{\textendash}43.}, keywords = {classification, molecular phylogeny, nomenclature, plastid DNA, SYSTEMATICS}, isbn = {1095-8339}, url = {http://dx.doi.org/10.1111/j.1095-8339.2010.01045.x}, author = {Zhou, Linlin and Su, Yvonne C. F. and Chalermglin, Piya and Saunders, Richard M. K.} }