Murray Ian Dawson

Murray Ian Dawson
Manaaki Whenua - Landcare Research · Systematics Team

MSc

About

76
Publications
71,002
Reads
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965
Citations
Additional affiliations
January 2000 - present
Royal New Zealand Institute Horticulture Inc.
Position
  • Webmaster, Journal Editor, National Executive
Description
  • Voluntary positions with the RNZIH
January 1991 - present
Manaaki Whenua - Landcare Research
Position
  • Researcher
Education
January 1994 - December 1995
University of Reading
Field of study
  • Plant & Fungal Taxonomy

Publications

Publications (76)
Article
Full-text available
Increasing public awareness is a prerequisite for successful management of invasive alien species (IAS). Environmental education can play an important role in this process by providing relevant learning outcomes and experiences for youth and students, as well as professionals in different sectors associated with introduction pathways or who are inv...
Book
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Allan Herbarium (CHR), Landcare Research, New Zealand Plant Names Database (PND) provides a contemporary account of the names of New Zealand indigenous and naturalised plants. The PND lists nearly 50 000 scientific names, primarily for hornworts, lichens, liverworts, mosses, ferns and seed plants in New Zealand, as well as some information for fres...
Article
Full-text available
This paper outlines the creation of a plant collections register and an associated cultivated plant names resource for New Zealand. This project was officially launched at the "Up the garden path" conference in Wellington on 3 March 2015.
Article
A method was designed and validated for analysis of dihydroxyacetone (DHA) in the floral nectar of mānuka (Leptospermum scoparium). The method was applied to samples collected from different regions of the North Island and the Nelson region of the upper South Island of New Zealand during the period 2009-2012 as well as to nectar samples from some A...
Article
1. Biological control (biocontrol) can provide permanent cost-effective control of plant pests, but has variable success. The ability to predict the success of weed biocontrol should improve target prioritisation and the cost-benefit ratio of weed biocontrol. 2. We compiled a data base of the quantitative impacts of weed biocontrol programmes again...
Article
Full-text available
Austroderia turbaria Connor is a threatened grass endemic to the Chatham Islands. Although formerly more widespread, remaining natural populations consist of highly fragmented remnants and/or individuals. Population genetic analysis of seed-raised progeny from six of the extant natural populations on Chatham and Pitt islands, using amplified fragme...
Article
URL: http://www.landcareresearch.co.nz/resources/identification/plants/flowering-plants-key There are currently 1075 genera in the key, and the key uses 56 features to identify them. The key is illustrated with 9000 images, showing a representation of each genus and the features used to identify them. The key links to Ngā Tipu o Aotearoa, Landcare...
Article
URL: http://www.landcareresearch.co.nz/resources/identification/plants/native-orchid-key This Lucid 3 key is for the identification of more than 123 species and informal entities of New Zealand native orchids. In addition to the main entries in the key, further tag-name entities are captioned under species aggregates. The native orchid key is ill...
Article
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We compared chromosome number (CN) variation in the nearly antipodean Italian and New Zealand floras to verify (i) whether patterns of variation reflect their similar latitudinal ranges or their different biogeographic/taxonomic contexts, (ii) if any differences are equally distributed across major taxa/lineages and (iii) if the frequency, number a...
Article
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There have been numerous changes in botanical names of New Zealand weeds and their assignment to plant families since the publication of the relevant Flora of New Zealand volumes. This paper outlines the reasons behind the changes in nomenclature, including the recent use of DNA sequencing to classify plants by the Angiosperm Phylogeny Group (APG)....
Technical Report
Full-text available
Lack of knowledge and poor cataloguing of which cultivated plants are present in New Zealand is a major issue – we do not adequately know what is in this country, what it is called or where it is growing. This is like having a supermarket without a stock inventory and these inadequacies represent a significant cost to the New Zealand economy. Mana...
Article
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The genus Dracophyllum Labill. (Ericaceae) has a fragmented distribution in Australasia, but reaches the greatest level of species richness and morphological diversity in New Zealand. We investigated evolutionary processes that contribute to this disparity in species richness by comparing DNA sequences from members of Dracophyllum, its close relati...
Article
Full-text available
Royal New Zealand Institute of Horticulture Journal
Article
URL: https://www.landcareresearch.co.nz/resources/identification/plants/weeds-key This Lucid 3 key is for the identification of more than 600 taxa (species, subspecies, varieties, hybrids and cultivars) including the Department of Conservation consolidated list of environmental weeds in New Zealand (Howell, 2008), the National Pest Plant Accord (...
Article
Full-text available
Pachycladon is a genus from New Zealand and Tasmania with 10 alpine species. During a study of Pachycladon exile, maternal‐like seedlings were frequently observed following interspecific crosses with other members of this genus. Crosses were conducted between P. exile and P. cheesemanii, P. novae‐zelandiae, Arabidopsis thaliana, and Brassica rapa t...
Article
The quadriflagellate snow alga Chlainomonas Christen, distributed in New Zealand and North America, has several unusual structural attributes. A process assumed to be cytokinesis involves extrusion of protoplasm from the parent through a narrow canal, C. kolii (J. T. Hardy et Curl) Hoham produces a net-like outer envelope rather than a cell wall, a...
Article
An artificial intergeneric hybrid derived from sexual hybridization between Arabidopsis thaliana (female) and Pachycladon cheesemanii (male) is characterized and formally named as ×Pachydopsis hortorum. A hybrid origin for ×Pachydopsis is supported by a chromosome number of 2n = 15, with this comprising haploid gametes from A. thaliana (n = 5) and...
Article
Full-text available
A taxonomic revision is presented for New Zealand plants previously included in Hypsela and Isotoma, with four species recognised. The new names and combinations formally made here are all placed in Lobelia. A single dispersal event from Australia to the South Island of New Zealand is inferred to have preceded a radiation into four New Zealand spec...
Data
Full-text available
An update of chromosome indexes published in the NZ Journal of botany for the New Zealand flora in 2000. This dataset is accessible at the taxon level at http://nzflora.landcareresearch.co.nz/
Article
Full-text available
Somatic chromosome numbers are documented for the majority of the New Zealand indigenous Orchidaceae, with counts for 80 species, 23 taxonomically indeterminate taxa, and 3 hybrids in 34 genera. Related chromosome counts are provided from elsewhere for comparison: 43 species, 12 taxonomically indeterminate taxa, and 4 hybrids in 17 genera from Aust...
Article
Full-text available
Field hybridisation experiments are described in which B. juncea, B. napus, and B. oleracea were crossed with B. napus (male), and B. napus was crossed with B. juncea (male). Five of the experiments used chlorsulfuron herbicide‐resistant B. napus as the paternal parent, allowing over 98 000 seeds to be easily and efficiently screened for chlorsulfu...
Article
Full-text available
Natural intraspecific hybrids between Brassica rapa var. chinensis and B. rapa var. oleifera are documented and analysed from a single wild population near Ashburton, Canterbury, New Zealand. Principal Component Analysis of 13 leaf morphological characters identified putative F1 hybrids that are intermediate between the parents. A second group of p...
Article
Full-text available
Controlled self- and cross-pollinations and seed set data for different genotypes of Olearia adenocarpa were used to test for self-incompatibility. The self-pollination experiments revealed two genotypes that are self-incompatible and four genotypes that are, to varying degrees, self-compatible. One self-compatible genotype had seed set (64.0%) com...
Article
Full-text available
Cluster and principal coordinates analyses of leaf morphological data support the recognition of Hoheria glabrata and H. lyallii at species rank. H. glabrata is distinguished by long leaves with distinctly cordate bases, sparsely hairy surfaces, shallow marginal indentations, and an acuminate apex. This species occurs in western parts of the South...
Article
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Sophora tomentosa, the type species of the genus Sophora, is shown by phylogenetic analyses of rbcL and ITS sequence data to be sister to Sophora sect. Edwardsia. S. tomentosa and most of the species from sect. Edwardsia share hypogeal germination, exstipulate leaves, and terete filaments. These species have buoyant seeds, and are distributed by oc...
Article
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Field surveys were undertaken of Brassica naturalised in Canterbury, investigating taxonom‐ic diversity, morphological variation, distribution, and abundance of naturalised taxa, crop escapes, and crop‐weed hybrids. As a result, six species, nine varieties, and two natural hybrids were recognised as naturalised in Canterbury. B. rapa var. oleifera...
Article
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Morphological variation within the widespread Leucopogon fraseri complex in New Zealand was investigated. Phenetic analyses (including multivariate principal component and cluster analysis) are presented, based on 22 vegetative and floral characters, from 62 plants grown under uniform conditions, collected from 37 sites. Results indicate that there...
Article
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A new ultramafic endemic Leucopogon xerampelinus is named from the Surville Cliffs, North Cape, New Zealand. The Surville Cliffs population has previously been referred to Leucopogon parviflorus, from which it differs by its prostrate, trailing habit, reddish leaf colour, smaller flowers, and restriction to ultramafic rocks. However, we consider th...
Article
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Facultative autonomous apomictic seed formation has been identified in Coprosma waima by progeny tests, flow cytometry, and DNA Amplified Fragment Length Polymorphism profiles. An isolated, cultivated, female plant of C. waima produced seeds, from which were raised female C. waima plants. Flow cytometry of seeds collected from these female plants h...
Article
Full-text available
An index of chromosome numbers for spermatophytes indigenous to the New Zealand Botanical Region is presented, along with full references to the original reports. Chromosome numbers are listed for 1212 species out of a total estimated indigenous spermatophyte flora of 1883 described species. This represents 64.4% of the total with chromosome counts...
Article
Full-text available
An index of chromosome numbers for New Zealand pteridophytes is presented. The list includes all known chromosome counts, fiom published sources and unpublished reports and theses, of ferns and fern allies indigenous to the New Zealand Botanical Region. Full references to the original reports are provided. Chromosome numbers are listed for 137 spec...
Article
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Chromosome numbers are documented for 122 taxa in 44 genera from 22 angiosperm families in the New Zealand region. Counts for comparison are also reported for 3 species indigenous to Australia.
Article
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Sequences from the chloroplast-encoded gene rbcL and the nuclear-encoded internal transcribed spacer (ITS) region were analyzed independently and then combined to infer phylogenetic relationships of Corynocarpus. Relationships obtained from the rbcL and ITS data sets are largely congruent and well resolved. The combined data set provides even great...
Article
Somatic chromosome counts are documented for seven species of the Gnaphalieae (Compositae) from Australia: Craspedia alpina Backh. (2n= 10x2 = 110) and C. glauca (Labill.) Spreng. (2n= 4x2 = 44), Ewartia catipes (DC.) Beauverd, E. nubigena Beauverd and E. planchonii (Hook.f.) Beauverd (all 2n= 2x2 = 28), E. meredithiae (F.Muell.) Beauverd (2n= 4x2...
Article
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Somatic chromosome numbers for New Zealand provenances of Phragmites australis are reported. A wide range of cytological variation was encountered—one plant was tetraploid (2n = 4x2 = 48), two were octoploid (2n = 8x2 = 96), and two were mixoploid (2n = 48, 53, 54; and 2n = 96, c. 264). One Australian provenance was octoploid. Possible regions of o...
Article
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Somatic chromosome numbers are documented for the 5 species and 2 subspecies of Corynocarpus. C. cribbianus, C. dissimilis, C. laevigatas, and C. similis are diploid (2n = 46). C. rupestris ssp. arborescens is tetraploid (2n = 92). C. rupestris ssp. rupestris is also tetraploid (2n = 92), but a single hexaploid seedling (2n = c. 138) was also encou...
Article
Full-text available
Somatic chromosome numbers are documented for 59 taxa, including three ornamental cultivars, in 20 genera and 15 families from the New Zealand region. Chromosome counts are also provided for Australian and Norfolk Island representatives of Coprosma (two species) and Melicytus/Hymenanthera (four taxa).
Article
Full-text available
Meiotic and mitotic chromosome counts are documented for 16 taxa and one putative hybrid of Wahlenbergia in New Zealand. Ten taxa, all those with rhizomatous growth form, have 2n = 4x = 36. Of the remaining group, with radicate growth form, five species and one hybrid have 2n = 8x = 72, and an undescribed species has 2n = 6x = 54. Chromosome counts...
Article
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Documented somatic chromosome numbers are provided for 28 taxa in Raoulia. Somatic chromosome numbers for 15 putative hybrid combinations are also documented. Ploidy levels range from 2n = 2x2 = 28 to 2n = 8x2 = 112.
Article
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Australopyrum calcis, a self-compatible, triticoid grass of restricted distribution, is described as new; it comprises two subspecies, ssp. calcis, and ssp. optatum; both are associated with limestone. This is the first species of Australopyrum recognised as endemic to New Zealand, and the first endemic diploid (2n = 14) grass found here. The karyo...
Article
Full-text available
Documented chromosome numbers are provided for the eight currently recognised New Zealand species of Clematis—C. afoliata, C. cunninghamii, C. foetida, C. forsteri, C. marata, C. marmoraria, C. paniculata, and C. quadribracteolata—and for all four entities now combined as C. forsteri. All the taxa investigated are diploid with 2n = 16 chromosomes,...
Article
Lamprothyrsus, a ditypic arundinoid, South American grass genus, consists predominantly of populations of exclusively female plants in which seeds are set by autonomous apospory. Lamprothyrsus peruvianus is a high polyploid-2n = ca. 136, the highest chromosome number so far recorded in the Arundineae. The hypothesis favored here for the evolution o...
Article
Full-text available
Observations were made on the growth, morphology, cytology, flowering, pollen, flavonoid patterns, and essential oil profiles of a population of Kunzea sinclairii (Kirk) W. Harris and comparisons made with populations of K. ericoides (A. Rich.) J. Thompson, and Leptospermum scoparium J. R. et G. Forst. A hybrid, K. sinclairii × L. scoparium, was di...
Article
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Somatic chromosome numbers are provided for 39 taxa. 3 hybrids in 12 genera.
Article
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Documented somatic chromosome numbers are provided for 19 species and 2 reputed hybrids in the 6 genera of the New Zealand Myrtaceae as well as 11 Australian species of the genus Leptospermum. All New Zealand taxa are diploid (2n = 22). Leptospermum minutifolium and L. myrtifolium from Australia are tetraploid (2n = 44).
Article
Full-text available
Gunnera magellanica, G. manicata and G. tinctoria (= G. chilensis) each have a chromosome number of 2n=34. The generalised idiogram is similar to that of the New Zealand species of Gunnera.-Author
Article
Full-text available
New interactive keys are being developed for rapid and accurate identification and management of New Zealand weeds and pest plants. These powerful but simple to use plant identification tools are created using Lucid™ software. The first key, completed in July 2009, is for the identification of all 150 National Pest Plant Accord (NPPA) species banne...

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