Peter Weston

Royal Botanic Gardens · National Herbarium of New South Wales

A taxonomic revision of the Pultenaea setulosa species complex (Fabaceae, tribe Mirbelieae) is presented. Prior to this study, P. setulosa Benth. was broadly circumscribed as a single, morphologically variable species. Here, we present evidence supporting the recognition of 18 species, 14 of which are new to science. Pultenaea setulosa is recircums...

We describe two new species of Prasophyllinae from New South Wales, in the genus Genoplesium R.Br. following the generic classification currently in use at the National Herbarium of New South Wales. One of these new species, Genoplesium branwhiteorum M.A.M.Renner & P.H.Weston, which we name for the Branwhite family, has been known for nearly a deca...

Morphological and single-nucleotide polymorphism data support splitting Pultenaea glabra Benth. into eight species, including one in Victoria, and seven in eastern and northern New South Wales. Six species are newly described, five of which are, like P. glabra , narrow-range endemics within the Greater Blue Mountains World Heritage Area and adjacen...

Premise: Understanding evolutionary history and classifying discrete units of organisms remains an overwhelming task, and lags in this discipline concomitantly impede an accurate documentation of biodiversity and conservation management. Rapid advances and improved accessibility of sensitive high throughput sequencing tools are fortunately quicken...

Morphological and single-nucleotide polymorphism data support splitting Pultenaea glabra Benth. into eight species, including one in Victoria, and seven in eastern and northern New South Wales. Six species are newly described, five of which are, like P. glabra, narrow-range endemics within the Greater Blue Mountains World Heritage Area and adjacent...

Australia has a very diverse pea-flowered legume flora with 1715 native and naturalised species currently recognised. Tribe Mirbelieae s.l. includes 44% of Australia’s peas in 24 genera with 756 recognised species. However, several genera within the Pultenaea alliance in tribe Mirbelieae are considered to be non-monophyletic and two main options ha...

New Guinea is the world’s largest tropical island and has fascinated naturalists for centuries. Home to some of the best-preserved ecosystems on the planet and to intact ecological gradients—from mangroves to tropical alpine grasslands—that are unmatched in the Asia-Pacific region, it is a globally recognized centre of biological and cultural diver...

Background: Orange jasmine has a complex nomenclatural history and is now known as Murraya paniculata (L.) Jack. Our interest in this common ornamental stemmed from the need to resolve its identity and the identities of closely related taxa as hosts of the pathogen 'Candidatus Liberibacter asiaticus' and its vector Diaphorina citri. Understanding...

Proteaceae subfamily Persoonioideae, as presently circumscribed, consists of the monogeneric tribe Placospermeae (Placospermum) and the tribe Persoonieae. The latter comprises the diverse genus Persoonia and monospecific genera found in New Zealand (Toronia), New Caledonia (Garnieria) and south-western Western Australia (Acidonia). Persoonia has 10...

The frequency of evolutionary biome shifts during diversification has important implications for our ability to explain geographic patterns of plant diversity. Recent studies present several examples of biome shifts, but whether frequencies of biome shifts closely reflect geographic proximity or environmental similarity of biomes remains poorly kno...

Background and aims: The basal eudicot family Proteaceae (approx. 1700 species) shows considerable variation in floral symmetry but has received little attention in studies of evolutionary development at the genetic level. A framework for understanding the shifts in floral symmetry in Proteaceae is provided by reconstructing ancestral states on an...

Using a ddRADseq approach to the development of a phylogeny for the Arenaria and Floribunda subgroups of Grevillea, we addressed questions of monophyly for the subgroups themselves as well as recognised species within the subgroups.

Species-level relationships within the pantropical, largely rainforest genus Cryptocarya R.Br (Lauraceae) and allied groups have long been problematic. Here, we utilise nuclear RPB2 and plastid trnL-trnF sequence data to reconstruct the phylogenetic relationships among Australian Cryptocarya species. We relate our findings to the previous two dispa...

Specimens of all known taxa and putative entities belonging to the Banksia spinulosa complex were collected from Kuranda in northern Queensland, western to central Queensland and down the eastern coast of Australia to Wilsons Promontory in southern Victoria. These specimens were used to investigate morphological variation in habit, stems, leaves, i...

Aim Ecologically driven diversification can create spectacular diversity in both species numbers and form. However, the prediction that the match between intrinsic (e.g. functional trait) and extrinsic (e.g. climatic niche) variables may lead to evolutionary radiation has not been critically tested. Here, we test this hypothesis in the Southern Hem...

The transfer of all species of Dryandra into Banksia in 2007, resulting from phylogenetic studies demonstrating that the latter is paraphyletic with respect to the former, generated controversy in some sections of the community. In a recent paper, Alex George, a taxonomist of long standing and monographer of both genera, criticised the transfer, an...

Premise of the study: Subtribe Hakeinae (526 spp.) represents a large Australian plant radiation central to our understanding of that flora's evolution and ecology. It contains Grevillea-the third largest plant genus in Australia and a group inferred to have among the highest diversification rates in the angiosperms. However, we lack a robust phyl...

AimWe tested whether the divergence of South American and Australian Lomatia was the result of the breakup of Gondwana, and assessed the date of divergence between Tasmania and mainland Australia, and across the Hunter River Valley.LocationSouth America (Chile and Argentina) and eastern Australia (Tasmania, Victoria, New South Wales and Queensland)...

Proteaceae are almost all non‐mycorrhizal and most species produce proteoid (= cluster) roots when grown in low‐phosphorus (P) soils. In south‐western Australia and the Cape Floristic Region of South Africa, Proteaceae have diversified more than anywhere else, and occur on the most severely P‐impoverished soils in the landscape. Several traits rela...

Unlabelled: • Premise of study: Have Gondwanan rainforest floral associations survived? Where do they occur today? Have they survived continuously in particular locations? How significant is their living floristic signal? We revisit these classic questions in light of significant recent increases in relevant paleobotanical data.• Methods: We t...

Darwin (1877) interpreted the floral structure and role of cross-pollination in several orchid species endemic to Australasia and now placed in the tribe Diurideae. During the 20th century, the pollination ecology of some Australian species was defined by a number of talented amateurs (Chapters 6 and 7). Using DNA sequencing and a combination of ve...

Possession of hooked, distinctively discolorous styles, a broadly flabellate common bract subtending each flower pair, and a lignotuber place a putative new species, Banksia sp. Jervis Bay, in the B. spinulosa complex. Phenetic analysis of individuals from all named taxa in the B. spinulosa complex, including B. sp. Jervis Bay, based on leaf, flora...

Aim Our aim was to implement a molecular dating analysis and assess divergence times among taxa of Winteraceae. This enabled us to test hypotheses of vicariance versus long‐distance dispersal to explain intercontinental disjunctions in the family. Location Madagascar, Australia (including Lord Howe Island), New Zealand, New Caledonia and South Ame...

Background and AimsWhen species cohesion is maintained despite ongoing natural hybridization, many questions are raised about the evolutionary processes operating in the species complex. This study examined the extensive natural hybridization between the Australian native shrubs Lomatia myricoides and L. silaifolia (Proteaceae). These species exhib...

Molecular systematics has revolutionized our understanding of the evolution of the Proteaceae. Phylogenetic relationships have been reconstructed down to generic level and below from alignments of chloroplast and nuclear DNA sequences. These trees have enabled the monophyly of all subfamilies, tribes, and subtribes to be rigorously tested and the c...

The phylogenetic relationships between genera in the tribe Diurideae (Orchidaceae subfamily Orchidoideae) were reconstructed by analyzing morphological characters and alignments of nuclear and chloroplast DNA sequences, using bootstrapped parsimony and Bayesian probability criteria. We considered our best tree to be the one constructed using all ou...

In this article, the authors describe the biogeographic patterns on which the concept of southern ecosystems is based. The authors outline how several different research traditions have interpreted those patterns, briefly discussing the strengths and weaknesses of each approach. Finally, the authors discuss the evolutionary, geological, and climati...

Lomatia R.Br. is a genus of 12 species in South America and eastern Australia. Hybridisation is extensive in the Australian species and molecular work is required to understand phylogenetic relationships and examine potential gene flow among species. We developed a library of microsatellite markers for Lomatia silaifolia (Sm.) R.Br. These markers w...

The protologue of Banksia conferta A.S.George var. penicillata A.S.George incorrectly cites R.G. Coveny 3537 as the type collection of this species, when it should have been cited as R.G. Coveny 3577.

Premise of study: The mechanisms by which plants tolerate water deficit are only just becoming clear. One key factor in drought tolerance is the ability to maintain the capacity to conduct water through the leaves in conditions of water stress. Recent work has shown that a simple feature of the leaf xylem cells, the cube of the thickness of cell w...

Advanced phylogenetic analyses of the orchid subtribe Aeridinae has been conducted using DNA sequences of ITS region of nrDNA and matK of cpDNA. In the preliminary work, we only involved the most representative Asian genera of the subtribe. Further, to establish more robust relationships in the Aeridinae, in this study we have extended the sampling...

Unlabelled: • Premise of the study: The glacial cycles of the Quaternary did not impact Australia in the same way as Europe and North America. Here we investigate the history of population isolation, species differentiation, and hybridization in the southeastern Australian landscape, using five species of Lomatia (Proteaceae). We use a chloropla...

Botanical work since 2008 on the Sleeping Giant section of the Kamdebooberge (Sneeuberg mountain complex, Eastern Cape, South Africa) has indicated that these mountains may be of significant conservation value. Accordingly, a precursory, rapid multi-disciplinary biodiversity assessment was undertaken in January 2011, focusing on plants, tetrapod ve...

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