Banksia

From Wikipedia, the free encyclopedia

This article is about the plant genus; for the suburb of Sydney, see Banksia, New South Wales.

iBanksia
Banksia prionotes
Scientific classification
Kingdom: Plantae Division: Magnoliophyta Class: Magnoliopsida Order: Proteales Family: Proteaceae Genus: Banksia L.f.
Diversity
About 80 species; see List of Banksia species
Synonyms
Sirmuellera Isostylis

Banksia is a genus of around 80 species in the plant family Proteaceae. Iconic Australian wildflower and popular garden plants, they are easily recognised by their characteristic flower spikes and fruiting "cones". They can vary from prostrate woody shrubs to trees up to 30 metres tall, and occur in all but the most arid areas of Australia. Heavy producers of nectar, Banksias are an important food source for nectariferous animals, and they are of economic importance to Australia's nursery and cut flower industries. However they are threatened by a number of processes including land clearing, frequent burning and disease, and a number of species are rare and endangered.

Contents 1 Description 2 Taxonomy 3 Distribution and Habitat 4 Ecology 4.1 Response to fire 4.2 Dieback 5 Uses 5.1 In the garden 5.2 Cut flower industry 5.3 Woodworking 5.4 Indigenous uses 6 Cultural references 6.1 Field guides and other technical resources 6.2 May Gibb's "Banksia men" 6.3 Other cultural references 7 References 8 External links

[edit] Description

Banksias grow as trees or woody shrubs. Trees of the largest species, B. integrifolia (Coast Banksia) and B. seminuda (River Banksia), often grow over 15 metres tall, and may be up to 30 metres tall^[1]. Banksia species that grow as shrubs are usually erect, but there are several species that are prostrate, with branches that grow on or below the soil.

The leaves of Banksia vary greatly between species. Sizes vary from the narrow, 1–1½ centimetre long leaves of B. ericifolia (Heath-leaved Banksia), to the very large leaves of B. grandis (Bull Banksia), which may be up to 45 centimetres long. The leaves of most species have serrated edges, but a few, such as B. integrifolia, do not. Leaves are usually arranged along the branches in irregular spirals, but in some species they are crowded together in whorls. Many species have differing juvenile and adult leaves (e.g. Banksia integrifolia has large serrated juvenile leaves).

Banksias are most easily recognised by their characteristic flower spike, known as an inflorescence, and the woody fruiting structures that appear after flowering. The flower spike consists of a central woody axis with a furry coating; it is generally held erect, but hangs down in a few species. This axis is covered in tightly-packed pairs of flowers, which are attached to the axis at right angles. A single flower spike generally contains hundreds, if not thousands of flowers. The most recorded is around 6000 individual flowers on inflorescences of B. grandis.

Banksia flowers are usually a shade of yellow, but orange, red and pink flowers also occur. The colour of the flowers is determined by the colour of the perianth parts and often the style. The style is much longer than the perianth, and is initially trapped by the upper perianth parts. These are gradually released over a period of days, either from top to bottom or from bottom to top. When the styles and perianth parts are different colours, the visual effect is of a colour change sweeping along the spike. This can be most spectacular in B. prionotes (Acorn Banksia) and related species, as the white inflorescence in bud becomes a brilliant orange. In most case, the individual flowers are tall, thin saccate (sack-shaped) in shape.

Occasionally, multiple flower spikes can form. This is most often seen in Banksia marginata and B. ericifolia (pictured right).

As the flower spikes age, the flower parts dry up and may turn shades of orange, tan or dark brown colour, before fading to grey over a period of years. In some species, old flower parts are lost, revealing the furry axis; in others, the old flower parts may persist for many years, giving the spikes a hairy appearance. Old flower spikes are commonly referred to as "cones", although they are not: cones only occur in conifers and cycads.

Despite the large size of the flower spike and the huge number of flowers per spike, only a very small number of flowers ever develop fruit, and in some species a flower spike will often set no fruit at all. The fruit of Banksia is a woody follicle embedded in the "cone". These consist of two horizontal valves that tightly enclose the seeds. The follicle opens to release the seed by splitting along the suture, and in some species each valve splits too. In some species the follicles open as soon as the seed is mature, but in most species most follicles open only after stimulated to do so by bushfire. Each follicle usually contains one or two small seeds, each with a wedge-shaped papery wing that causes it to spin as it falls to the ground.

[edit] Taxonomy

Main article: Taxonomy of Banksia

The Banksia genus was first described and named by Carolus Linnaeus the Younger in his April 1782 publication Supplementum Plantarum; hence the full name for the genus is "Banksia L.f." The genus name honours the English botanist Sir Joseph Banks, who collected the first Banksia specimens in 1770, during James Cook's first expedition.

Banksia belongs to the family Proteaceae, subfamily Grevilleoideae, and tribe Banksieae. Banksia and the closely related Dryandra are placed together in subtribe Banksiinae, mainly because in both genera the flowers occur in condensed heads. Recent research into the relationship between Banksia and Dryandra has suggested that Dryandra should be sunk into Banksia.

The exact number of species of Banksia is a matter of some contention. The most recent authoritative synopsis, George (1999), listed 76 species. Since then a new species, B. rosserae, has been published (Olde and Marriott, 2002), bringing the number of species to 77. However George (1999) gave subspecific rank to four taxa that had previously been promoted to species by Kevin Thiele and Pauline Ladiges in their 1996 cladistics analysis of the genus. Some Australian herbaria have continued to follow Thiele and Ladiges (1996) in ranking these taxa as species, thus recognising 81 species. Furthermore Harden (2002) recognises the species B. cunninghamii Sieber ex Reichb, even though both George (1999) and Thiele and Ladiges (1996) consider it a subspecies of B. spinulosa. Finally, B. paludosa subsp. astrolux is under review and is likely to be raised to species level soon.

[edit] Distribution and Habitat

All but one of the Banksia species are endemic to Australia. The exception is B. dentata (Tropical Banksia), which occurs throughout northern Australia, and on islands to the north including New Guinea and the Aru Islands. The other species occur in two distinct geographical regions: southwest Western Australia and eastern Australia. Southwest Western Australia is the main centre of biodiversity; over three quarters of Banksia species occur only there, from Exmouth down to east of Esperance. Eastern Australia has far fewer species, but these include some of best known and most widely distributed species, including B. integrifolia and B. spinulosa (Hairpin Banksia). Here they occur from the Eyre Peninsula in South Australia right around the east coast up to Cape York in Queensland.

The vast majority of Banksia are found in sandy (or gravelly) soils, though some populations of B. marginata (Silver Banksia) and B. spinulosa do occur on heavier, more clay-like, soils. B. seminuda is exceptional for its preference for rich loams along watercourses. Most occur in heathlands or low woodlands, but B. seminuda and B. integrifolia both grow in forests. Most species do not grow well near the coast, and few species, including B. rosserae and B. elderiana (Swordfish Banksia), occur in arid areas. Most of the eastern Australian species survive in uplands, but of the Western Australian species only B. solandri (Stirling Range Banksia) survives at high altitudes.

Studies of the south-western species have found the distribution of Banksia species to be primarily constrained by rainfall. With the exception of B. rosserae, no species tolerates annual rainfall of less than 200 millimetres, despite many species surviving in areas that receive less than 400 millimetres. Banksia species are present throughout the region of suitable rainfall, with greatest speciation in cooler, wetter areas. Hotter, drier regions around the edges of the genus's range tend to have fewer species with larger distributions. The greatest species richness occurs in association with uplands, especially the Stirling Range.^[2]

[edit] Ecology

Main article: Ecology of Banksia

Banksias are heavy producers of nectar, and so are important sources of food for nectariferous animals, including honeyeaters and small mammals such as rodents, antechinus, honey possums, pygmy possums, gliders and bats^[3]. Many of these animals play a role in pollination of Banksia. Varous studies have shown mammals and birds to be important pollinators^[4][5]. An interesting observation by Carpenter in 1978 was that some banksias had a stronger odour at night possibly to attract mammal pollinators. Other associated fauna include the larvae of moths (such as the Dryandra Moth) and weevils, which burrow into the "cones" to eat the seeds and pupate in the follicles; and birds such as cockatoos, who break off the "cones" to eat both the seeds and the insect larvae.

A number of Banksia species are considered rare or endangered. These include B. brownii (Feather-leaved Banksia), B. cuneata (Matchstick Banksia), B. goodii (Good's Banksia), B. oligantha (Wagin Banksia), B. tricuspis (Pine Banksia), and B. verticillata (Granite Banksia).

[edit] Response to fire

Banksia plants are naturally adapted to the presence of regular bushfires in the Australian landscape. About half of Banksia species are killed by bushfire, but these regenerate quickly from seed, as fire also stimulates the opening of sead-bearing follicles and the germination of seed in the ground. The remaining species usually survive bushfire, either because they have very thick bark that protects the trunk from fire, or because they have lignotubers from which they can resprout after fire. In Western Australia, the first group are known as 'seeders' while the second 'sprouters'.

Infrequent bushfires at expected intervals pose no threat, and are in fact beneficial for regeneration of banksia populations. However, too frequent bushfires can seriously reduce or even eliminate populations from certain areas, by killing seedlings and young plants before they reach fruiting age.^[6] Many fires near urban areas are caused by arson, and thus the frequency is often much higher than fires would have been prior to human habitation. Furthermore, residents who live in areas near bushland may pressure local councils to burn areas near homes more frequently, to reduce fuel-load in the bush and thus reduce ferocity of future fires. Unfortunately there are often discrepancies in agreed frequency between these groups and conservation groups.

[edit] Dieback

Another threat to Banksia is the water mould Phytophthora cinnamomi, commonly known as "dieback". Dieback attacks the roots of plants, destroying the structure of the root tissues, "rotting" the root, and preventing the plant from absorbing water and nutrients. Banksia's proteoid roots, which help it to survive in low-nutrient soils, make it highly susceptible to this disease. All Western Australian species are vulnerable, although most eastern species are fairly resistant^[7].

Vulnerable plants typically die within a few years of infection. In southwest Western Australia, where dieback infestation is widespread, infested areas of Banksia forest typically have less than 30% of the cover of uninfested areas. Plant deaths in such large proportions can have a profound influence on the makeup of plant communities. For example, in southwestern Australia Banksia often occurs as an understory to forests of Jarrah (Eucalyptus marginata), another species highly vulnerable to dieback. Infestation kills both the Jarrah overstory and the Banksia understory, and over time these may be replaced by a more open woodland consisting of an overstory of the resistant Marri (Corymbia calophylla), and an understory of the somewhat resistant Parrotbush (Dryandra sessilis).^[8]

A number of species of Banksia are threatened by dieback. Nearly every known wild population of B. brownii shows some signs of dieback infection, which could possibly wipe it out within years.^[9][10]. Other vulnerable species include B. cuneata, and B. verticillata.

Dieback is notoriously difficult to treat, although there has been some success with phosphite and phosphorous acid, which are currently used to inoculate wild B. brownii populations. However this is not without potential problems as it alters the soil composition by adding phosphorus. Some evidence suggests that phosphorous acid may inhibit proteoid root formation^[11].

Because dieback thrives in moist soil conditions, it can be a severe problem for Banksias that are watered, such as in the cut flower industry and urban gardens.

[edit] Uses

[edit] In the garden

Banksias are popular garden plants in Australia because of their large, showy flower heads, and because the large amounts of nectar they produce attracts birds and small mammals. Popular garden species include B. spinulosa, B. ericifolia, B. aemula (Wallum Banksia ), B. serrata (Saw Banksia), Banksia media (Southern Plains Banksia) and the cultivar Banksia 'Giant Candles'. Banksia species are primarily propagated by seed in the home garden as cuttings can be difficult to strike. However commercial nurserymen extensively utilize the latter method (indeed, cultivars by nature must be vegetatively propagated by cuttings or grafting).

Over time, dwarf cultivars and prostrate species are becoming more popular as urban gardens grow ever smaller. These include miniature forms under 50cm high of B. spinulosa and B. media, as well as prostrate species such as B. petiolaris and B. blechnifolia .

Banksias possibly require more TLC (i.e. maintenance) than other Australian natives, though are fairly hardy if the right conditions are provided (sunny aspect and well drained sandy soil). They may need extra water during dry spells until established, which can take up to two years. If fertilised, only slow-release, low-phosphorus fertilizer should be used, as the proteoid roots may be damaged by high nutrient levels in the soil. All respond well to some form of pruning.

Within the Australian horticultural community there is an active subculture of Banksia enthusiasts who seek out interesting flower variants, breed and propagate cultivars, exchange materials and undertake research into cultivation problems and challenges. The main forum for exchange of information within this group is ASGAP's Banksia Study Group.

[edit] Cut flower industry

With the exception of the nursery industry, Banksia have limited commercial use. Some species, principally B. coccinea (Scarlet Banksia), B. baxteri, B. hookeriana (Hooker's Banksia), B. sceptrum) (Sceptre Banksia), B. speciosa (Showy Banksia) and B. menziesii (Menzies' Banksia) are grown on farms in Western and Southern Australia, as well as Israel and Hawaii, and the flower heads harvested for the cut flower trade. Their nectar is also sought by beekeepers, not for the quality of the honey, which is often poor, but because the trees provide an abundant and reliable source of nectar at times when other sources provide little.

[edit] Woodworking

Banksia wood is a red colour with an attractive grain, but it is rarely used as it warps badly on drying. It is occasionally used for ornamental purposes, such as turnery and cabinet panelling, and has also been used to make keels for small boats. The large "cones" of B. grandis are used for wood-turning projects. They are also sliced up and sold as drink coasters; these are generally marketed as souvenirs for international tourists.

[edit] Indigenous uses

The Indigenous people of south-western Australia would suck on the flower spikes to obtain the nectar, they also soaked the flower spikes in water to make a sweet drink^[12]. Banksia trees are a reliable source of grubs which are extracted as food.

[edit] Cultural references

[edit] Field guides and other technical resources

A number of field guides and other semi-technical books on the genus have been published. These include:

Field Guide to Banksias

Written by Ivan Holliday and Geoffrey Watton and first published in 1975, this book contained descriptions and colour photographs of species known at the time. It was largely outdated by the publication of Alex George's classic 1981 monograph, but a revised and updated second edition was released in 1990.

The Banksias

This three volume monograph contains watercolour paintings of every Banksia species by renowned botanical illustrator Celia Rosser, with accompanying text by Alex George. Its publication represents the first time that such a large genus has been entirely painted. Published by Academic Press in association with Monash University, the three volumes were published in 1981, 1988 and 2000 respectively.

The Banksia Book

Begun by Fred Humphries and Charles Gardner, both of whom passed away before its completion, The Banksia Book was eventually completed by Alex George and first published in 1984. A comprehensive volume containing colour illustrations of every species, it is now in its third edition, published in 1996. This book is sought after by many and becoming hard to find.

The Banksia Atlas

In 1983 the Australian Biological Resources Study (ABRS) decided to pilot an Australia-wide distribution study of a significant plant genus. Banksia was chosen because it was a high-profile, widely distributed genus that was easily identified, but for which distribution and habitat was poorly known. The study mobilised over 400 volunteers, collecting over 25,000 field observations over a two year period. Outcomes included the discovery of two new species, as well as new varieties and some rare colour variants, and discoveries of previously unknown populations of rare and threatened species. The collated data was used to create The Banksia Atlas, which was first published in 1988.^[13].

Banksias, Waratahs and Grevilleas and all other plants in the Australian Proteaceae family

Written by J. W. Wrigley and M. Fagg, this was published by Collins Publishers in 1989. A comprehensive text on all the Proteaceae genera with good historical notes and an overview of the 1975 Johnson & Briggs classification. It is out of print and hard to find.

[edit] May Gibb's "Banksia men"

Perhaps the best known cultural reference to Banksia is the "big bad Banksia men" of May Gibbs' children's book Snugglepot and Cuddlepie. Gibb's "Banksia men" are modelled on the appearance of aged Banksia "cones", with follicles for eyes and other facial features. There is some contention over which species actually provided the inspiration for the "Banksia men": the drawings most resemble the old cones of B. aemula, but B. attenuata (Slender Banksia) has also been cited, as this was the species that Gibbs saw as a child in Western Australia.

[edit] Other cultural references

In 1989, the Banksia Environmental Foundation was created to support and recognise people and organizations that make a positive contribution to the environment. The Foundation launched the annual Banksia Environmental Awards in the same year.^[14]

[edit] References

1. ^ Liber C (2004). "Really Big Banksias". Banksia Study Group Newsletter 6: 4-5.
2. ^ Lamont, Byron B. and S. W. Connell (1996). "Biogeography of Banksia in southwestern Australia". Journal of Biogeography 23: 295–309.
3. ^ Hackett DJ, Goldingay RL (2001). "Pollination of Banksia spp. by non-flying mammals in north-eastern New South Wales.". Australian Journal of Botany 49: 637–644.
4. ^ Wooller SJ, Wooller RD (2001). "Seed set in two sympatric banksias, Banksia attenuata and B. baxteri". Australian Journal of Botany 49: 597–602.
5. ^ Wooller SJ, Wooller RD (2002). "Mixed mating in Banksia media". Australian Journal of Botany 50: 627–631.
6. ^ Wooller SJ, Wooller RD, Brown KL (2002). "Regeneration by three species of Banksia on the south coast of Western Australia in relation to fire interval". Australian Journal of Botany 50: 311–317.
7. ^ McCredie TA, Dixon KW, Sivasithamparam K. (1985) Variability in the resistance of Banksia L.f. species to Phytophthora cinnamomi Rands. Australian Journal of Botany. 33: 629-637.
8. ^ Impact of Dieback in Western Australia. Managing Dieback. Department of Environment and Conservation. Retrieved on 2006-06-14.
9. ^ Banksia brownii, Species Profile and Threats Database, Department of the Environment and Heritage, Australia.
10. ^ Brown, Andrew, Thomson-Dans, Carolyn, and Marchant, Neville (eds) (1998). Western Australia's Threatened Flora. Como, Western Australia: Department of Conservation and Land Management. ISBN 0-7309-6875-8.
11. ^ Phytophthora in forests and natural ecosystems. Second International IUFRO meeting. Murdoch University. Retrieved on 2006-06-26.
12. ^ Wheeler, Judy (2003). Common Trees of the South-West Forests. Department of Conservation and Land Management. ISBN 0-7309-6967-4.
13. ^ Taylor, Anne and Hopper, Stephen D. (1988). The Banksia Atlas (Australian Flora and Fauna Series Number 8). Canberra: Australian Government Publishing Service. ISBN 0-644-07124-9.
14. ^ Introduction and History. Banksia Environmental Foundation. Retrieved on 2006-07-11.

• Boland, D. J. et. al. (1984). Forest Trees of Australia (Fourth edition revised and enlarged). CSIRO Publishing, Collingwood, Victoria, Australia. ISBN 0-643-05423-5..
• George, A. S. (1981). "The Genus Banksia". Nuytsia 3 (3): 239–473.
• George, A. S. (1999). “Banksia”, Wilson, Annette (ed.): Flora of Australia: Volume 17B: Proteaceae 3: Hakea to Dryandra. CSIRO Publishing / Australian Biological Resources Study, 175–251. ISBN 0-643-06454-0.
• Harden, Gwen (2002). “Banksia”, Harden, Gwen (ed): Flora of New South Wales: Volume 2 (Revised Edition). New South Wales University Press, Kensington, 82–86. ISBN 0-86840-156-0.
• Olde, Peter M. and Marriott, Neil R. (2002). "One new Banksia and two new Grevillea species (Proteaceae: Grevilleoideae) from Western Australia". Nuytsia 15 (1): 85–99.
• Taylor, Anne and Hopper, Stephen D. (1988). The Banksia Atlas (Australian Flora and Fauna Series Number 8). Canberra: Australian Government Publishing Service. ISBN 0-644-07124-9.
• Thiele, Kevin and Ladiges, Pauline Y. (1996). "A Cladistic Analysis of Banksia (Proteaceae)". Australian Systematic Botany 9: 661–733.

[edit] External links

• Banksia at Flora of Australia Online, Department of the Environment and Heritage, Australia.
• Banksia at Florabase, Department of Environment and Conservation, Western Australia.
• The Banksia Page of ASGAP
• Banksia Study Group of ASGAP
• Banksia Online Discussion Group