L Pedley’s research while affiliated with Department of Environment and Science and other places

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Publications (15)


(273) A Proposal to Amend Art. 68
  • Article

February 1993

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1 Read

Taxon

R. J. F. Henderson

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L. Pedley




Patterns of Distribution of Acacia in Australia

January 1988

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14 Reads

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24 Citations

Australian Journal of Botany

Patterns of distribution are described for the three subgenera and nine sections that make up the Australian Acacia flora. Subgenus Phyllodineae (833 species) is widespread and contains 99% of the species; subgenus Acacia (six species) and subgenus Aculeiferum (one species) are poorly represented and virtually confined to the north of the continent. The geographic patterns of species-richness are strongly influenced by sections Phyllodineae (352 species), Juliflorae (219 species) and Plurinerves (178 species). Section Phyllodineae has centres of richness south of the Tropic of Capricorn in temperate and adjacent semiarid areas of eastern, south-eastern and south-western Australia. The section is poorly represented in the tropics. The closely related sections Juliflorae and Plurinerves predominate in the north of the continent, semiarid areas of the south-west, many rocky tablelands of the Arid Zone and along the Great Dividing Range and adjacent inland riverine lowland areas in eastern Australia. The remaining four sections contribute little to the overall patterns of species-richness. The principal speciespoor areas are sandy and fluvial lowland regions of the Arid Zone. In eastern Australia, sections Botrycephalae, Juliflorae, Phyllodineae and Plurinerves show discontinuous patterns of species-richness along the Great Dividing Range. All sections have species whose ranges terminate in the area of the McPherson-Macleay Overlap region.






Derivation and dispersal of Acacia (Leguminosae), with particular reference to Australia, and the recognition of Senegalia and Racosperma

April 1986

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20 Reads

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167 Citations

Botanical Journal of the Linnean Society

The morphology of seedlings, leaves, flowers and inflorescences, anatomy of the pod, the occurrence of extra-floral nectaries, free amino acids of the seeds, flavonoid compounds in heartwoods, cyanogenic compounds and porate, colporate and extraporate pollen, and susceptibility to rusts, all indicate that three genera, Acacia Miller, Senegalia Raf. and Racosperma Martius, should be recognized. These correspond to currently accepted subgenera of Acacia. The size of these more narrowly circumscribed genera is in keeping with the size of genera of other tribes of low diversity in Leguminosae. Acacia and Senegalia arose independently from the Ingeae, with Racosperma being derived from Senegalia. Section Filicinae is more advanced than section Senegalia of Senegalia, and sections Racosperma and Pukhella, both with at least some species with bipinnate foliage, are the most advanced of Racosperma, while the other sections Pleurinervia and Lycopodiifolia have only phyllodinous species. Long-range dispersal of Racosperma from the Australian region has occurred, but the broad pattern of distribution is interpreted in terms of plate tectonics. Racosperma was present in Australia in the late Cretaceous but did not become widespread until the general drying of the continent in the Miocene. The flora of SW Australia has been isolated from the rest of the continent by climatic barriers since the late Tertiary and has a high proportion of endemic species. Barriers to plant migration in the east have operated only intermittently and there is no area comparable in endemism to the southwest.


Citations (10)


... (1835) and cited the type as Acacia penninervis, one of the Australian phyllodinous species listed by Candolle, effectively lectotypifying it by that species. Pedley ( , 1987aPedley ( -d, 1988) subsequently described five new species of Racosperma, provided four new names in that genus, and effected 275 combinations based on taxa from Acacia subgenus Phyllodineae. (Only three other valid combinations under Racosperma had previously been made: see Martius 1835.) ...

Reference:

Nomenclatural and classification history of Acacia (Leguminosae: Mimosoideae), and the implications of generic subdivision
Racosperma deltoideum (Cunn. ex. G. Don) Pedley (Leguminosae: Mimosoideae) and Related Species in Northern Australia
  • Citing Article
  • January 1987

Austrobaileya

... The genus is considered taxonomically difficult by many authors, principally because its species all possess similar morphological characteristics (Mohlenbrock 1958;Pedley 1977;'t Mannetje 1977;Burt 1984;Stace and Cameron 1984;Gillies and Abbott 1996;Vander Stappen et al. 1998, 1999Sawkins 1999). Many Stylosanthes species apparently originated through hybridization, with reticulate, hologamic, interspecific, or intraspecific speciation, while mechanisms of genetic incompatibility progressively evolved (Soltis and Soltis 1995;Costa 2006). ...

Notes on Leguminosae. I
  • Citing Article
  • January 1977

Austrobaileya

... The distribution of Acacia is predominantly Australian, where the genus is dominant in semiarid and arid vegetation, although the highest species diversity is in the south-west of Western Australia and along the Great Dividing Range of eastern Australia (Maslin 2001a;Murphy et al. 2010). In addition, 17 species and two subspecies occur in four regions outside the Australian continent (Pedley 1975(Pedley , 1990; Table 1, Fig. 1). All of these extra-Australian species are phyllodinous and, on the basis of morphology, are currently classified in sections Juliflorae and Plurinerves (Maslin 2001a). ...

New Combinations in Acacia Miller (Leguminosae: Mimosoideae)
  • Citing Article
  • January 1990

Austrobaileya

... In Australia, Acacia melanoxylon is a forest species that grows naturally in a wide range of forest ecosystems, with a wide latitudinal distribution along its east coast, which has versatile applications (sawn timber for all types of use including wood carving, joinery, veneer making, furniture, firewood and livestock forage) and high adaptability (Maslin & Pedley, 1982a;Maslin & Pedley, 1982b). Thus, in Argentina, it could become part of the offer of the regional market of quality wood for solid applications related to the construction and furniture industries, which regionally demand this kind of wood (DPE 2005a(DPE , 2005b. ...

The distribution of Acacia (Leguminosae: Mimosoideae) in Australia. Part 1. Species distribution maps
  • Citing Article
  • January 1982

... The shrub layers are directly contributes to forest biodiversity (Kerns and Ohmann, 2004;Čermá et al., 2009), including compositional and structural diversity, enhancing the aesthetics of forest ecosystems and helping to protect watersheds from erosion (Alaback and Herman, 1988;Halpern and Spies, 1995;Muir et al., 2002). The distribution of shrubs is strongly influenced by environmental conditions, such as climate (Pedley, 1979;Westman, 1991;Kienast et al., 1998). Chemical and physical soil properties and biotic interactions play a major role in influence the distribution of shrub species (Pedley, 1979). ...

A revision of Acacia Mill. in Queensland (concluded)
  • Citing Article
  • January 1979

Austrobaileya

... In addition, both C. sylvestre and C. ericinum have purple wing sepals and minutely papillose leaf margins whereas C. pallidum has white wing sepals and smooth leaf margins. As circumscribed here, C. pallidum is regarded as endemic to Queensland, whereas previous authors considered this species to occur over a much broader area, including the Northern Territory and Western Australia (Pedley 1981(Pedley , 1984Monro 2003). The disjunction in records between those in Queensland and the Northern Territory is over 1000 km and is not an artefact of limited collecting as suggested by Monro (2003), but rather a genuine biogeographic disjunction between two closely related species. ...

TWO NEW SPECIES OF POLYGALACEAE FROM CENTRAL AUSTRALIA
  • Citing Article

... Wendl. (A. cyanophylla Lindley) is originated from South Western Australia [5], which is considered as an exotic tree species in many parts of the world and an invasive species to some countries [6]. One of Ethiopia's exotic tree species, Acacia saligna (A.saligna), was brought to the Tigray region of Ethiopia in 1972 with the intention of restoring the ecosystem and conserving soil and water [7]. ...

Derivation and dispersal of Acacia (Leguminosae), with particular reference to Australia, and the recognition of Senegalia and Racosperma
  • Citing Article
  • April 1986

Botanical Journal of the Linnean Society

... Another piece of evidence is from Mulga-banded vegetation in Australia. Mulga is recorded in many regions of Australia but the dominant species across all sites is Acacia aneura (Miller et al., 2002), even though there are ∼1,000 Acacia species in Australia (Maslin and Pedley, 1988). The near-vertical architecture of A. aneura branches, stems, and phyllodes promotes efficient channeling of rainfall to stem bases (Slatyer, 1965;Miller et al., 2002). ...

Patterns of Distribution of Acacia in Australia
  • Citing Article
  • January 1988

Australian Journal of Botany

... However, the genus was subsequently overlooked or ignored for almost 100 years, until it was resurrected by Britton and Rose (1928), alongside the newlysegregated genus Acaciella Britton & Rose, in their treatment of Acacia for the Flora of North America. However, despite this recognition by Britton and Rose (1928), Senegalia was subsequently ignored (Pedley 1987) and Bentham's (1875) delimitation of Acacia sensu lato (s.l.) as a broadly circumscribed pantropical genus persisted until the reclassification of Acacia by Pedley (1986). Pedley (1986) divided Acacia into three genera: Acacia sensu stricto (s.s.), Senegalia and Racosperma Mart. ...

Australian Acacia: taxonomy and phytogeography
  • Citing Article
  • January 1986