Banksia integrifolia, commonly known as the coast banksia,[4] is a species of tree that grows along the east coast of Australia. One of the most widely distributed Banksia species, it occurs between Victoria and Central Queensland in a broad range of habitats, from coastal dunes to mountains. It is highly variable in form, but is most often encountered as a tree up to 25 metres (82ft) in height. Its leaves have dark green upper surfaces and white undersides, a contrast that can be striking on windy days.
A hardy and versatile garden plant, B.integrifolia is widely planted in Australian gardens. It is a popular choice for parks and streetscapes, and has been used for bush revegetation and stabilisation of dunes. Its hardiness has prompted research into its suitability for use as a rootstock in the cut flower trade, but has also caused concerns about its potential to become a weed outside its natural habitat.
Names
Now widely known as the coast banksia or coastal banksia, B.integrifolia was previously known by a range of common names. The Checklist of Australian Trees lists four other common names: honeysuckle, white banksia, white bottlebrush and white honeysuckle;[5] and some older sources refer to it as honeysuckle oak.[6][7]
It was known to Indigenous Australians before its discovery and naming by Europeans; for example, the Gunai people of Gippsland called it birrna.[8] Because of its wide range it would have a name in a number of other indigenous languages, but these are now lost. In 2001, a search of historical archives for recorded indigenous names of Victorian flora and fauna failed to find a single name for the species.[9]
Description
B.integrifolia is a highly variable species. It is most often encountered as a tree up to 25 metres (82ft) in height, but in sheltered locations it can reach 35 metres (115ft). In more exposed areas it may grow as a small, gnarled tree, reaching to no more than about 5 metres (16ft), and in highly exposed positions, such as on exposed coastal headlands, it may even be reduced to a small shrub.[10]
The tree usually has a single stout trunk, which is often twisted and gnarled, with the rough grey bark characteristic of Banksia. The leaves are dark green with a white underside, and occur in whorls of three to five. Adult leaves have entire margins. George specifies their dimensions as 4–20cm (1.6–7.9in) long and 6–35mm (0.24–1.38in) wide,[10][11] but The Banksia Atlas warns that "Atlas contributors found great variability in these measurements with specimens often falling outside the varietal limits specified by George (1981) or being intermediate between two varieties."[12] Juvenile leaves have dentate margins with a few short teeth, and are generally larger than adult leaves.[10]
Flowers occur in Banksia's characteristic "flower spike", an inflorescence made up of several hundred flowers densely packed in a spiral around a woody axis. This is roughly cylindrical, 10–12cm (3.9–4.7in) high and 5cm (2.0in) wide. Flowers are usually pale yellow to yellow, but may be greenish or pinkish in bud. Each individual flower consists of a tubular perianth made up of four united tepals, and one long wiry style. Characteristic of the taxonomic section in which it is placed, the styles are straight rather than hooked. The style ends are initially trapped inside the upper perianth parts, but break free at anthesis.[10] This process starts with the flowers at the bottom of the inflorescence, sweeping up the spike at an unusually high rate of between 96 and 390 flowers per 24 hours.[13]
The flower spikes are not as prominent as in some other Banksia species, as they arise from two- to three-year-old nodes nested within the foliage. After flowering, old flower parts wither and fall away over a period of several months, revealing the "cone", a woody axis embedded with many small follicles. The follicles are initially greenish and downy, but gradually fade to dark grey. Each follicle contains one or sometimes two seeds, separated by a thin wooden separator. The seed itself is black, 6–10mm (0.24–0.39in) long with a feathery black 'wing' 10–20mm (0.4–0.8in) long.[10][11]
B.integrifolia was first collected at Botany Bay on 29 April 1770, by Sir Joseph Banks and Dr Daniel Solander, naturalists on the Endeavour during Lieutenant (later Captain) James Cook's first voyage to the Pacific Ocean.[14][15] Solander coined the (unpublished) binomial name Leucadendrum integrifolium in Banks' Florilegium.[16] However, the species was not published until April 1782, when Carolus Linnaeus the Younger described the first four Banksia species in his Supplementum Plantarum. Linnaeus distinguished the species by their leaf shapes, and named them accordingly. Thus the species with entire leaf margins was given the specific name integrifolia, from the Latininteger meaning 'entire' and folium 'leaf'.[17] The full name for the species is therefore Banksia integrifolia L.f.[5]
Then followed around 200 years of confusion over the taxonomic limits of the species, caused by the species' great variability, similarities with closely related species, and early attempts to classify the species based on dried specimen material alone. A stable Banksia taxonomy did not begin to emerge until 1981 with the publication of Alex George's landmark monograph The genus Banksia L.f. (Proteaceae). Over the next 18 years, George's arrangement was gradually refined in the light of new research and the discovery of new material, and there were several changes to B.integrifolia's infraspecific taxa.[18][19] These changes culminated in George's 1999 arrangement, which had broad acceptance until 2005, when Austin Mast, Eric Jones and Shawn Havery published a phylogeny that did not accord with George's arrangement.[20] A new taxonomic arrangement was not published at the time, but early in 2007 Mast and Thiele initiated a rearrangement by transferring Dryandra to Banksia, and publishing B.subg. Spathulatae for the species having spoon-shaped cotyledons. They foreshadowed publishing a full arrangement once DNA sampling of Dryandra was complete. In the meantime, if Mast and Thiele's nomenclatural changes are taken as an interim arrangement, then B.integrifolia is placed in B.subg. Spathulatae; it is the type species for the subgenus.[21]
Placement within Banksia
The current taxonomic arrangement of the genus Banksia is based on George's 1999 monograph for the Flora of Australia book series.[10] In this arrangement, B.integrifolia is placed in Banksia subg. Banksia, because its inflorescences take the form of Banksia's characteristic flower spikes; Banksia sect. Banksia because of its straight styles; and Banksia ser. Salicinae because its inflorescences are cylindrical. Kevin Thiele additionally placed it in a subseries Integrifoliae,[19] but this was not supported by George.
B.integrifolia's placement within Banksia may be summarised as follows:
Although some of the great variability of B.integrifolia can be attributed to environmental factors, much is genetic: George writes that it "gives the impression that it is actively speciating to fill the many ecological niches through its range".[11] Genetic variation across its range has been mapped in some detail with microsatellite markers, facilitating further analysis of intraspecific relationships.[25]Fractal analysis of the shape and spectrum (colour) of the leaves has been used to determine to which subspecies plants of unknown provenance belong.[26]
Banksia integrifolia subsp. integrifolia
The nominate subspecies occurs near the coast over most of the species' range except the far north. It varies little except in northern New South Wales and southern Queensland, where some populations appear to be intermediate with B.integrifolia subsp. compar.
Banksia integrifolia subsp. compar
This subspecies grows in coastal Queensland as far north as Proserpine. For most of its range it is the only subspecies, but near its southern limit it co-occurs with B.integrifolia subsp. integrifolia. The two subspecies are distinguishable by their leaves, which are larger and glossy with wavy margins on B.integrifolia subsp. compar.
Banksia integrifolia subsp. monticola
Commonly known as white mountain banksia, it is the only subspecies with a montane distribution; it occurs in the Blue Mountains of New South Wales. It is similar in form to B.integrifolia subsp. integrifolia, but differs in having longer, narrower leaves, and follicles that are more deeply embedded in the old flower spike.[27]
Hybrids
Presumed natural hybrids have been reported between B.integrifolia and other members of Banksia ser. Salicinae, although no hybrid names have been formally published to date. Presumed hybrids are identified by their intermediate features; for example those with B.paludosa (swamp banksia), known from Jervis Bay and Green Cape on the coast of southern New South Wales, have a smaller habit, longer, thinner flower spikes, and persistent old flowers on old "cones", which are otherwise bare on pure B.integrifolia.[28][29][30]
Presumed hybrids with B.marginata (silver banksia) occur on Wilsons Promontory in Victoria; these are found in localities where both species co-occur, and have features intermediate between the two.[11] Another purported hybrid with B.marginata, thought to be from Cape Paterson on Victoria's south coast, was first described by Alf Salkin and is commercially available in small quantities. It forms an attractive hardy low-growing plant to 1 metre (3.3ft).[31]
Distribution and habitat
B.integrifolia is widely distributed, in both geographical and ecological terms. According to Alex George, "it spans a wider geographical and climatic range than any other species."[11] Thiele and Ladiges make a similar claim: that its distribution "is a broader latitudinal, altitudinal and ecological amplitude than any other species, with the possible exception of B.spinulosa."[32] No other species of tree occurs closer to the coast at Cape Byron, making B.integrifolia the most easterly tree on the Australian mainland.[33]
For most of its distribution, B.integrifolia occurs only within about 50km (31mi) of the coast, where it typically occurs on poor quality sandy soils derived from sandstone. It grows near coastal cliffs and headlands, alongside river estuaries, and even on stabilised sand dunes. The temperature range for this area is around 0–30°C (32–86°F), with almost no frosts. The species can occur in pure stands, but is usually associated with other species such as Melaleuca quinquenervia (broad-leaved paperbark),[12][36]Angophora costata (smooth-barked apple), Corymbia gummifera (red bloodwood), Eucalyptus botryoides (bangalay), Monotoca elliptica (wedding bush) and Leptospermum laevigatum (coast tea tree).[37]
Between Sydney and Brisbane, B.integrifolia is found up to 200km (120mi) inland, with B.integrifolia subsp. monticola occurring in the Blue Mountains at altitudes up to 1,500m (4,900ft). There it grows on better quality volcanic or rocky soils derived from granites and basalts, and would experience up to 100 frosts per year. In this montane habitat, it occurs in association with Eucalyptus species such as E.viminalis (manna gum) and E.pauciflora (snow gum), and also rainforest species such as Nothofagus moorei (Antarctic beech) and Orites excelsa (prickly ash).[12][36]
Like most other Proteaceae, B.integrifolia has proteoid roots, i.e., roots with dense clusters of short lateral rootlets that form a mat in the soil just below the leaf litter. These enhance solubilisation of nutrients, thus allowing nutrient uptake in low-nutrient soils such as the phosphorus-deficient native soils of Australia. Studies on B.integrifolia suggest that its proteoid root mat achieves this by chemically modifying its soil environment.[38]
B.integrifolia flowers have an unusually short life span for Banksia species, producing nectar for only about four to twelve days after anthesis. Most nectar is produced during the night and early in the morning, with only small amounts produced during the day.[13] Flowers are produced all through the year, but there is a strong peak in autumn. Little else flowers within its range at this time, so it is a seasonally important source of food for nectariferous animals. Surveys have observed a range of animals feeding on the species, including a wide range of insects; many species of bird including Phylidonyris novaehollandiae (New Holland honeyeater), Anthochaera carunculata (red wattlebird), Anthochaera chrysoptera (little wattlebird), Acanthorhynchus tenuirostris (eastern spinebill) and Trichoglossus moluccanus (rainbow lorikeet); and mammals such as Petaurus norfolcensis (squirrel glider), Petaurus breviceps (sugar glider), Acrobates pygmaeus (feathertail glider), Pteropus poliocephalus (grey-headed flying fox),[12][39] and Syconycteris australis (common blossom bat).[40] In some areas such as at Bungawalbin National Park in northern New South Wales, B.integrifolia is the only source of nectar and pollen in the autumn (March–April) and late winter (July).[41] The importance of non-flying mammals to pollination of B.integrifolia was demonstrated in 1989, with a study in Wilsons Promontory National Park showing a reduction of fruit set when measures were taken to exclude them.[42]Banksia integrifolia is the host plant of the lichen species Arthonia banksiae.[43] Microscopic Eriophyid mites (Eriophyidae) cause galls on young infructescences of B. integrifolia[44]
Unlike most Banksia species, B.integrifolia does not require bushfire to trigger the release of its seed. Rather, seed is released spontaneously on reaching maturity in late summer. The species' non-reliance on fire for seed dispersal suggests that the exclusion of fire would not affect plant populations, but a number of studies have found the opposite to be true: in areas where fire has been excluded for many years, populations have declined substantially. An investigation into the defoliation and premature death of trees on the Yanakie Isthmus in south Victoria reached the tentative conclusion that the absence of fire had created unhealthy surface soil conditions.[45] On the Mornington Peninsula, surveys of an area that had not been burnt since the 1890s found that B.integrifolia densities fell by 77% between 1977 and 2000. A subsequent study found the decline to have been caused by extremely high seedling mortality rates, due to grazing by herbivores and intense competition for soil moisture during summer. Despite acknowledging that "the role of fire in these systems remains unclear", it concluded that "developing fire and/or grazing management regimes will be necessary to conserve the structural integrity of these coastal ecosystems."[46]
Hardy and versatile, B.integrifolia will grow in clay, sand, acid and even alkaline soils, and it shows good resistance to wind and salt, making it suitable for seaside planting.[48] It is therefore highly regarded as a low-maintenance garden tree, although its large size makes it unsuitable for smaller gardens. Its hardiness may, however, forewarn weed potential, as some evidence of weediness has been seen in South Africa,[49]Western Australia and New Zealand.[50] When growing near bushland within its native habitat, it is suggested to obtain local provenance plants if available.[51]
The most common form available in commercial nurseries is unimproved Banksia integrifolia subsp. integrifolia. It prefers a sunny aspect without exposure to frosts, and tolerates fairly heavy pruning. Seeds do not require any treatment, and take 5 to 6 weeks to germinate.[52] Flowering begins at around four to six years from seed. The other subspecies are less well known in cultivation, but are obtainable. Cultivation is presumably similar to B.integrifolia subsp. integrifolia,[53] except that B.integrifolia subsp. monticola may be assumed frost-tolerant. Dwarf forms of B.integrifolia are sometimes sold, and a registered prostrate cultivar, Banksia 'Roller Coaster', is available. The latter is a vigorous ground-hugging plant that can spread to 4 or 5 metres (13 or 16ft) across yet remains only 50cm (20in) high.[54]
Because of its high resistance to P.cinnamomi dieback, the feasibility of using B.integrifolia as a rootstock for susceptible Banksia species in the cut flower trade is under investigation. Presently, the success rate for grafting is only 30–40%, and even with successful grafts there is a tendency for the union to fail under stress. More research is needed before the technique will be ready for commercial use.[55]
Other uses
B.integrifolia subsp. compar
The wood of B.integrifolia is pink to red, with inconspicuous rings and conspicuous rays. It is spongy and porous, with a density of around 530kg/m3 (33lb/cuft). It is considered highly decorative, but it warps badly on drying,[36] has poor load-bearing qualities, and is susceptible to termite attack;[53] it is therefore unsuitable for most construction purposes. It is sometimes used for cabinet panelling and in ornamental turnery, and natural bends were once sought after for making boat knees.[56] It is a useful firewood.[57]
B.integrifolia produces a dark amber-coloured honey of middling quality and therefore low commercial value.[36] Despite this, the species is highly valued by beekeepers because it produces large amounts of pollen and nectar during autumn and winter, thus helping support hives at a time when little else is flowering.[56]
Historically, indigenous Australians obtained nectar from B.integrifolia by stroking the flower spikes then licking their hands, or by steeping flower spikes in a coolamon overnight. They also used the flower spikes as hairbrushes. Early settlers used the nectar as a syrup for sore throats and colds;[58] and bushmen would impregnate barren "cones" with fat to make a slow-burning candle.[56]
More recently, B.integrifolia has been used in the art of bonsai. Its rangy habit and long internodes are challenging to overcome, but the leaves do reduce with pruning, and unlike the gnarlier B.serrata (saw banksia) its trunk can become textured with age.[59][60]
Banksia is a genus of around 170 species of flowering plants in the family Proteaceae. These Australian wildflowers and popular garden plants are easily recognised by their characteristic flower spikes, and woody fruiting "cones" and heads. Banksias range in size from prostrate woody shrubs to trees up to 30 metres (100 ft) tall. They are found in a wide variety of landscapes: sclerophyll forest, (occasionally) rainforest, shrubland, and some more arid landscapes, though not in Australia's deserts.
Banksia subg. Isostylis is a subgenus of Banksia. It contains three closely related species, all of which occur only in Southwest Western Australia. Members of subgenus Isostylis have dome-shaped flower heads that are superficially similar to those of B. ser. Dryandra, but structurally more like reduced versions of the "flower spikes" characteristic of most other Banksia taxa.
Banksia subg. Banksia is a valid botanic name for a subgenus of Banksia. As an autonym, it necessarily contains the type species of Banksia, B. serrata. Within this constraint, however, there have been various circumscriptions.
As with other flowering plants, the taxonomy of Banksia has traditionally been based on anatomical and morphological properties of the Banksia flower, fruiting structure and seed, along with secondary characteristics such as leaf structure and growth habit. Increasingly, molecular evidence from DNA is providing important new insights into relationships within the genus and between this and other genera in the Proteaceae.
Banksia paludosa, commonly known as the marsh or swamp banksia, is a species of shrub in the plant genus Banksia. It is native to New South Wales, Australia, where it is found between Sydney and Batemans Bay, with an isolated population further south around Eden. There are two recognised subspecies, the nominate of which is a spreading shrub to 1.5 m (4.9 ft) in height, and subsp. astrolux is a taller shrub to 5 m (16 ft) high found only in Nattai National Park.
Banksia plagiocarpa, commonly known as Dallachy's blue banksia, blue banksia or Hichinbrook banksia, is a species of shrub or tree in the plant genus Banksia. It occurs only on Hinchinbrook Island, Queensland and the immediately adjacent mainland. First collected in 1867, Banksia plagiocarpa was not described until 1981, when Alex George named it in his monograph of the genus Banksia. Genetic studies show it to be related to Banksia aquilonia, Banksia oblongifolia and Banksia robur.
Banksia saxicola, the rock banksia or Grampians banksia, is a species of tree or shrub in the family Proteaceae. It occurs in Victoria in two distinct populations, one in The Grampians and the other on Wilsons Promontory. Formerly considered to be a form of B. integrifolia, it was described as a distinct species by Alex George in 1981. It is most closely related to Banksia marginata.
Banksia aquilonia, commonly known as the northern banksia and jingana, is a tree in the family Proteaceae and is endemic to north Queensland on Australia's northeastern coastline. With an average height of 8 m (26 ft), it has narrow glossy green leaves up to 20 cm (7.9 in) long and 6 to 10 cm high pale yellow flower spikes, known as inflorescences, appearing in autumn. As the spikes age, their flowers fall off and they develop up to 50 follicles, each of which contains two seeds.
Banksia ser. Salicinae is a valid botanic name for a series of Banksia. First published by Carl Meissner in 1856, the name has had three circumscriptions.
The taxonomy of Banksia integrifolia has a long and complex history, the result of confusion caused by the species' great variability, and similarities with some closely related species. The existence of hybrids between B. integrifolia and related species as well as early attempts to classify the species based on dried specimen material have also contributed to the confusion.
Banksia integrifolia subsp. integrifolia is a subspecies of Banksia integrifolia.
Banksia integrifolia subsp. compar is a subspecies of Banksia integrifolia. It has larger, glossier leaves than other subspecies, and occurs much further north.
Banksia integrifolia subsp. monticola, commonly known as White Mountain banksia, is a subspecies of Banksia integrifolia. Described in 1994, it occurs in the Blue Mountains and in northern New South Wales. It contains the largest recorded Banksia trees.
Banksia ser. Cyrtostylis is a taxonomic series within the plant genus Banksia. First published at sectional rank by George Bentham in 1870, it was demoted to a series by Alex George in 1981. The name has had three circumscriptions.
Banksia ionthocarpa is a species of shrub that is endemic to Western Australia. It has short, hairy, prostrate stems, pinnatifid leaves, pinkish purple to orange flower in heads of between forty and sixty at the base of leaves, and egg-shaped follicles with a distinctive tuft of hairs on the end.
Kevin Thiele and Pauline Ladiges taxonomic arrangement of Banksia, published in 1996, was a novel taxonomic arrangement that was intended to align the taxonomy of Banksia more closely with the phylogeny that they had inferred from their cladistic analysis of the genus. It replaced Alex George's 1981 arrangement, but most aspects were not accepted by George, and it was soon replaced by a 1999 revision of George's arrangement. However some herbaria have continued to follow Thiele and Ladiges on some points.
Robert Brown's taxonomic arrangement of Banksia was published in his book of 1810, Prodromus Florae Novae Hollandiae et Insulae Van Diemen, and expanded in the supplement to that publication, Supplementum Primum Prodromi Florae Novae Hollandiae, in 1830. It was the first survey of Banksia species to be published, and included descriptions of a number of previously undescribed species.
Alex George's taxonomic arrangement of Banksia was the first modern-day arrangement for that genus. First published in 1981 in the classic monograph The genus Banksia L.f. (Proteaceae), it superseded the arrangement of George Bentham, which had stood for over a hundred years. It was overturned in 1996 by Kevin Thiele and Pauline Ladiges, but restored by George in 1999. A recent publication by Austin Mast and Kevin Thiele suggests that it will soon be overturned again.
Banksia laevigata subsp. laevigata, the tennis ball banksia, is a subspecies of small woody shrub in the plant genus Banksia. It occurs in Western Australia's semi-arid shrubland. It and the closely related B. laevigata subsp. fuscolutea are the two subspecies of the species Banksia laevigata.
Banksia neoanglica, commonly known as New England banksia is a shrub or small tree with leaves that are greenish on the upper surface, whitish with soft hairs on the lower side and spikes of flowers with styles that turn black as they open. It is similar to Banksia spinulosa and was formerly known as Banksia spinulosa var. neoanglica, but differs in that its leaves are wider and have margins that are not tightly turned under. It is found mainly along the eastern edge of the Great Dividing Range.
↑ Harden, G.J."PlantNET - FloraOnline". PlantNET (The NSW Plant Information Network System). Royal Botanic Gardens and Domain Trust, Sydney. Retrieved 25 May 2024.
1 2 McFarland, David C. (1985). "Flowering Biology and Phenology of Banksia integrifolia and B.spinulosa (Proteaceae) in New England National Park, N.S.W". Australian Journal of Botany. 33 (6): 705–714. doi:10.1071/BT9850705.
↑ Mast, Austin R.; Jones, Eric H.; Havery, Shawn P. (2005). "An Assessment of Old and New DNA sequence evidence for the Paraphyly of Banksia with respect to Dryandra (Proteaceae)". Australian Systematic Botany. 18 (1). CSIRO Publishing / Australian Systematic Botany Society: 75–88. doi:10.1071/SB04015.
1 2 3 4 Boland, D. J.; etal. (1992). Forest Trees of Australia (Fourth edition revised and enlarged). Collingwood, Victoria: CSIRO Publishing. ISBN978-0-643-05423-3.
↑ Hackett, Damian J.; Goldingay, Ross L. (2001). "Pollination of Banksia spp. by non-flying mammals in North-eastern New South Wales". Australian Journal of Botany. 49 (5): 637–644. doi:10.1071/BT00004.
↑ Sharpe, D.J.; Goldingay, Ross L. (1998). "Feeding behaviour of the squirrel glider at Bungawalbin Nature Reserve, north-eastern New South Wales". Wildlife Research. 25 (3): 243–54. doi:10.1071/WR97037.
↑ Jones, David L. Elliot, W. Rodger, Jones, Sandra R., & Blake, Trevor L. (2015). "Pests, diseases, ailments and allies of Australian plants : an introduction to some of the good, bad and interesting creatures that you might find in your garden; with aids to their identification, symptoms and recommendations for control". Reed New Holland Publishers Pty Ltd. p. 173.
↑ Bennett, L. T.; Attiwill, P. M. (1996). "The Nutritional Status of Healthy and Declining Stands of Banksia Integrifolia on the Yanakie Isthmus, Victoria". Australian Journal of Botany. 45: 15–30. doi:10.1071/BT96025.
↑ Price, J. N. & J. W. Morgan (2003). "Mechanisms controlling establishment of the non-bradysporous Banksia integrifolia (Coast Banksia) in an unburnt coastal woodland". Austral Ecology. 28: 82–92. doi:10.1046/j.1442-9993.2003.01252.x.
↑ McCredie, T. A.; Dixon, K. W.; Sivasithamparam, K. (1985). "Variability in the resistance of Banksia L.f. species to Phytophthora cinnamomi Rands". Australian Journal of Botany. 33 (6): 629–637. doi:10.1071/BT9850629.
↑ Elliot, R.; Jones, D. L. (1982). Encyclopaedia of Australian Plants Suitable for Cultivation. Melbourne: Lothian Press. ISBN978-0-85091-143-5.
↑ Keighery, Greg; Keighery, Bronwen (2015). "Banksia behaving badly". Western Australian Naturalist: 270–277.
↑ Liber, Cas (2002). "Banksias as weeds"(PDF). Banksia Study Group Newsletter. Vol.4, no.1. Association of Societies for Growing Australian Plants. pp.4–5. ISSN1444-285X.
↑ Sedgley, Margaret (1996). "Banksia, Family Proteaceae". In Krystyna A. Johnson; Margaret Burchett (eds.). Native Australian Plants: Horticulture and Uses. Sydney: University of New South Wales Press. pp.18–35. ISBN978-0-86840-159-1.
↑ Buchanan, Robyn (1999). "City insignia". Logan: Rich in History, Young in Spirit. Logan City Council. Archived from the original(PDF) on 12 October 2006. Retrieved 25 October 2006.
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