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|Wildlife of Australia|
The flora of Australia comprises a vast assemblage of plant species estimated to over 20,000 vascular and 14,000 non-vascular plants, 250,000 species of fungi and over 3,000 lichens. The flora has strong affinities with the flora of Gondwana, and below the family level has a highly endemic angiosperm flora whose diversity was shaped by the effects of continental drift and climate change since the Cretaceous. Prominent features of the Australian flora are adaptations to aridity and fire which include scleromorphy and serotiny. These adaptations are common in species from the large and well-known families Proteaceae ( Banksia ), Myrtaceae ( Eucalyptus - gum trees), and Fabaceae ( Acacia - wattle).
The arrival of humans around 50,000 years agoand settlement by Europeans from 1788, has had a significant impact on the flora. The use of fire-stick farming by Aboriginal people led to significant changes in the distribution of plant species over time, and the large-scale modification or destruction of vegetation for agriculture and urban development since 1788 has altered the composition of most terrestrial ecosystems, leading to the extinction of 61 plant species and endangering over 1000 more.
Australia was part of the southern supercontinent Gondwana, which also included South America, Africa, India and Antarctica. Most of the modern Australian flora had their origin in Gondwana during the Cretaceous when Australia was covered in subtropical rainforest. Australian ferns and gymnosperm bear strong resemblance to their Gondwanan ancestors,and prominent members of the early Gondwanan angiosperm flora such as the Nothofagus , Myrtaceae and Proteaceae were also present in Australia.
Gondwana began to break up 140 million years ago (MYA); 50 MYA during the Eocene Australia separated from Antarctica, and was relatively isolated until the collision of the Indo-Australian Plate with Asia in the Miocene era 5.3 MYA. As Australia drifted, local and global climatic change had a significant and lasting effect: a circumpolar oceanic current developed, atmospheric circulation increased as Australia moved away from Antarctica, precipitation fell, there was a slow warming of the continent and arid conditions started to develop.These conditions of geographic isolation and aridity led to the development of a more complex flora. From 25-10 MYA pollen records suggest the rapid radiation of species like Eucalyptus , Casuarina , Allocasuarina , Banksia and the pea-flowered legumes, and the development of open forest; grasslands started to develop from the Eocene. Collision with the Eurasian Plate also led to additional South-east Asian and cosmopolitan elements entering the flora like the Lepidium and Chenopodioideae.
The development of aridity and the old and nutrient poor soils of the continent led to some unique adaptations in the Australian flora and evolutionary radiation of genera – like Acacia and Eucalyptus – that adapted to those conditions. Hard leaves with a thick outer layer, a condition known as scleromorphy, and C4 and CAM carbon fixation which reduce water loss during photosynthesis are two common adaptations in Australian arid-adapted dicot and monocot species respectively.
Rising aridity also increased the frequency of fires in Australia. Fire is thought to have played a role in the development and distribution of fire-adapted species from the Late Pleistocene. An increase in charcoal in sediment around 38,000 years ago coincides with dates for the inhabitation of Australia by the Indigenous Australians and suggests that man-made fires, from practices like fire-stick farming, have played an important role in the establishment and maintenance of sclerophyll forest, especially on the east coast of Australia.Adaptations to fire include lignotubers and epicormic buds in Eucalyptus and Banksia species that allow fast regeneration following fire. Some genera also exhibit serotiny, the release of seed only in response to heat and/or smoke. Xanthorrhoea grass trees and some species of orchids only flower after fire.
In biogeography and zoogeography, Australia alone is sometimes considered a realm (Australian realm), while some authors unite the area with other regions to form the Australasian realm.
In phytogeography, the area is considered a floristic kingdom (Australian kingdom), with the following endemic families, according to Takhtajan: Platyzomataceae (now included in Pteridaceae), Austrobaileyaceae, Idiospermaceae, Gyrostemonaceae, Baueraceae, Davidsoniaceae, Cephalotaceae, Eremosynaceae, Stylobasiaceae, Emblingiaceae, Akaniaceae, Tremandraceae, Tetracarpaeaceae, Brunoniaceae, Blandfordiaceae, Doryanthaceae, Dasypogonaceae and Xanthorrhoeaceae. It is also the center of origin of Eupomatiaceae, Pittosporaceae, Epacridaceae, Stackhousiaceae, Myoporaceae and Goodeniaceae. Other families with high occurrences are Poaceae, Fabaceae, Asteraceae, Orchidaceae, Euphorbiaceae, Cyperaceae, Rutaceae, Myrtaceae (specially Leptospermoideae) and Proteaceae.
Australia's terrestrial flora can be collected into characteristic vegetation groups. The most important determinant is rainfall, followed by temperature which affects water availability.Several schemes of varying complexity have been created, the most recent scheme developed by the Natural Heritage Trust divides Australia's terrestrial flora into 30 Major Vegetation Groups, and 67 Major Vegetation Subgroups.
According to the scheme the most common vegetation types are those that are adapted to arid conditions where the area has not been significantly reduced by human activities such as land clearing for agriculture. The dominant vegetation type in Australia is the hummock grasslands that occur extensively in arid Western Australia, South Australia and the Northern Territory. It accounts for 23% of the native vegetation, the predominant species of which are from the genus Triodia . Zygochloa also occurs in inland sandy areas like the Simpson Desert.
A further 39% of native vegetation is covered by a combination of:
Other groups with restricted areas of less than 70,000 square kilometres include tropical or temperate rainforest and vine thickets, tall or open eucalypt forests, Callitris and Casuarina forests, and woodlands and heath.
Australia has over 30,000 described species of vascular plants, these include the angiosperms, seed-bearing non-angiosperms (like the conifers and cycads), and the spore-bearing ferns and fern allies.Of these about 11% are naturalised species; the remainder are native or endemic. The vascular plant flora has been extensively catalogued, the work being published in the ongoing Flora of Australia series. A list of vascular plant families represented in Australia using the Cronquist system is also available.
At the higher taxonomic levels the Australian flora is similar to that of the rest of the world; most vascular plant families are represented within the native flora, with the exception of the cacti, birch and a few others, while 9 families occur only in Australia.Australia's vascular flora is estimated to be 85% endemic; this high level of vascular plant endemism is largely attributable to the radiation of some families like the Proteaceae, Myrtaceae, and Fabaceae.
|Family||% of total flora1||Notable genera|
|Fabaceae||12.0||Acacia , Pultenaea , Daviesia , Bossiaea|
|Myrtaceae||9.3||Callistemon , Eucalyptus , Melaleuca , Leptospermum|
|Asteraceae||8.0||Brachyscome , Olearia|
|Proteaceae||5.6||Banksia , Hakea , Grevillea|
|Orchidaceae||3.0||Caladenia , Pterostylis|
|Ericaceae||2.1||Leucopogon , Epacris|
|Rutaceae||1.8||Boronia , Correa , Citrus|
|1 Based on total number of species|
Data from Orchard modified to AGPII classifications.
The native Australian flora contains many monocotyledons. The family with the most species is the Poaceae which includes a huge variety of species, from the tropical bamboo Bambusa arnhemica to the ubiquitous spinifex that thrives in arid Australia from the genera Triodia and Plectrachne . There are more than 800 described species of orchid in Australia.About one quarter of these are epiphytes. The terrestrial orchids occur across most of Australia, the majority of species being deciduous – their aboveground parts die back during the dry season and they re-sprout from a tuber when it rains.
Other families with well-known representatives include the alpine Tasmanian button grass, which form tussock-like mounds from the Cyperaceae; the genus Patersonia of temperate iris-like forbs from the Iridaceae; and, the kangaroo paws from the family Haemodoraceae. The Xanthorrhoea grass trees, the screw palms of the Pandanaceae and palms are large monocots present in Australia. There are about 57 native palms; 79% of these only occur in Australia.
The dicots are the most diverse group of angiosperms. Australia's best known species come from three large and very diverse dicot families: the Fabaceae, the Myrtaceae and the Proteaceae. The Myrtaceae is represented by a variety of woody species; gum trees from the genera Eucalyptus , Corymbia and Angophora , Lillipillies ( Syzygium ), the water-loving Melaleuca and Bottlebrush and the shrubby Darwinia and Leptospermum , commonly known as teatrees, and Geraldton wax. Australia is also a centre of diversity for the Proteaceae, with woody, well-known genera such as Banksia , Dryandra , Grevillea , Hakea , the waratah and Australia's only commercial native food crop, the macadamia. Australia also has representatives of all three legume subfamilies. Caesalpinioideae is notably represented by Cassia trees. The Faboideae or pea-flowered legumes are common and many are well known for their flowers, including the golden peas, Glycine species and the Sturt's desert pea. The Mimosoideae is best known for the huge genus Acacia which includes Australia's floral emblem the golden wattle.
Many plant families that occur in Australia are known for their floral displays that follow seasonal rains. The Asteraceae is well represented by its subfamily Gnaphalieae, which included the paper or everlasting daisies; this group has its greatest diversity in Australia. Other families with flowering shrubs include the Rutaceae, with the fragrant Boronia and Eriostemon , the Myoporaceae with the Eremophila , and members of the Ericaceae with Victoria's Floral Emblem Epacris impressa .
Amongst the most ancient species of flowering hardwood trees are the Casuarinaceae, including beach, swamp and river oaks, and Fagaceae represented in Australia by three species of Nothofagus . Trees of the Rosales are notably represented by the Moraceae whose species include the Moreton Bay Fig and the Port Jackson Fig, and the Urticaceae whose members include several tree sized stinging nettles; Dendrocnide moroides is the most virulent. There are also numerous sandalwood species including the quandongs and native cherry, Exocarpus cupressiformis . The bottle tree of the Sterculiaceae is one of 30 tree species from the Brachychiton . There are about 75 native mistletoes that parasitise Australian tree species, including two terrestrial parasitic trees, one of which is the spectacular Western Australian Christmas tree.
Australia's salt marshes and wetlands are covered by a large variety of salt and drought tolerant species from the Amaranthaceae which include the saltbushes ( Atriplex ) and bluebushes ( Maireana and Chenopodium ). Many of these plants have succulent leaves; other native succulents are from the genera Carpobrotus , Calandrinia and Portulaca . Succulent stems are present in many of the Euphorbiaceae in Australia, though the best known members are the non-succulent looking fragrant Wedding bushes of the genus Ricinocarpos. Carnivorous plants which favour damp habitats are represented by four families including the sundews, bladderworts, pitcher-plants from the Cephalotaceae, which are endemic to Western Australia, and the Nepenthaceae.
Aquatic moncots and dicots both occur in Australian waters. Australia has about 51,000 square kilometres of seagrass meadows and the most diverse group seagrass species in the world. There are 22 species found in temperate waters and 15 in tropical waters out of a known 70 species worldwide.Aquatic dicots include the mangroves; in Australia there are 39 mangrove species that cover 11,500 square kilometres and comprise the third largest area of mangroves in the world. Other native aquatic dicots here include water lilies and water milfoils.
Gymnosperms present in Australia include the cycads and conifers. There are 69 species of cycad from 4 genera and 3 families of eastern and northern Australia, with a few in south-western Western Australia and central Australia[ clarification needed ]. Native pines are distributed through 3 families [ clarification needed ], 14 genera and 43 species, of which 39 are endemic. Most species are present in wetter mountainous areas consistent with their Gondwanan origins, including the genera Athrotaxis , Actinostrobus , Microcachrys , Microstrobos , Diselma and the Tasmanian Huon pine, sole member of the genus Lagarostrobos. Callitris is a notable exception; species from this genus are found mainly in drier open woodlands. The most recently discovered species of conifer is the living fossil Wollemi pine, which was first described in 1994.
Spore bearing vascular plants include the ferns and fern allies. True ferns are found over most of the country and are most abundant in tropical and subtropical areas with high rainfall. Australia has a native flora of 30 families, 103 genera and 390 species of ferns, with another 10 species being naturalised. The fern allies are represented by 44 native species of psilophytes, horsetails and lycophytes. [ clarification needed ] and rainforest, there are aquatic, epiphytic ( Platycerium , Huperzia and Asplenium ), and terrestrial species including large tree ferns from the genera Cyathea and Dicksonia .Ferns prefer a cool and damp environment since water is required for reproduction, the majority of Australian species are found in bushland
The algae are a large and diverse group of photosynthetic organisms. Many studies of algae include the cyanobacteria, in addition to micro and macro eukaryotic types that inhabit both fresh and saltwater. Currently, about 10,000 to 12,000 species of algae are known for Australia.The algal flora of Australia is unevenly documented: northern Australia remains largely uncollected for seaweeds and marine phytoplankton, descriptions of freshwater algae are patchy, and the collection of terrestrial algae has been almost completely neglected.
The bryophytes – mosses, liverworts and hornworts – are primitive, usually terrestrial, plants that inhabit the tropics, cool-temperate regions and montane areas; there are some specialised members that are adapted to semi-arid and arid Australia. There are slightly fewer that 1,000 recognised species of moss in Australia. The five largest genera are the Fissidens , Bryum , Campylopus , Macromitrium and Andreaea .There are also over 800 species of liver- and horn-worts in 148 genera in Australia.
The fungal flora of Australia is not well characterised; Australia is estimated to have about 250,000 fungal species of which roughly 5% have been described. Knowledge of distribution, substrates and habitats is poor for most species, with the exception of common plant pathogens.
Lichens are composite organisms comprising, in most cases, an Ascomycete fungus and a unicellular green alga, their classification is based on the type of fungi. The lichen flora of Australia and its island territories, including Christmas Island, Heard Island, Macquarie Island and Norfolk Island, currently comprises 3,238 species and infra-specific taxa in 422 genera, 34% of which are considered to be endemic.
The first Australian plants recognised and classified in Linnaean taxonomy were a species of Acacia and Synaphea in 1768 as Adiantum truncatum and Polypodium spinulosum respectively by Dutch philologist Pieter Burman the Younger, who stated they were from Java. Later, both were found to be from Western Australia, likely to have been collected near the Swan River, possibly on a 1697 visit there of fellow Dutchman Willem de Vlamingh. [ who? ] Botanical exploration was enabled by the founding of the permanent colony at Port Jackson in 1788, and the subsequent expeditions along Australia's coastline.This was followed by Cook's expedition making landfall at what is now Botany Bay in April 1770, and the early work of Banks, Solander and Parkinson.
The Australian flora was utilised by the Indigenous inhabitants of Australia. Indigenous Australians used thousands of species for food, medicine, shelter, tools and weapons.For example, the starchy roots of Clematis microphylla were used in western Victoria to make a dough that was baked, and the leaves of the plant were used as a poultice applied to skin irritations and blisters.
Forestry species include a number of eucalypts used for paper and timber, huon pine, hoop pine, cypress pine, Australian Blackwood, and sandalwood from Santalum spicatum and S. lanceolatum . A significant area used by the pastoral industry is based on native pasture species including Mitchell grass, saltbush, bluebush, wallaby grass, spear grass, tussock grasses and kangaroo grass.
Until recently the macadamia nut and Tetragonia tetragonoides were the only Australian food plant species widely cultivated. Although commercial cultivation of macadamia started in Australia in the 1880s, it became an established large-scale crop in Hawaii.The development of a range of native food crops began in the late 1970s with the assessment of species for commercial potential. In the mid-1980s restaurants and wholesalers started to market various native food plant products. These included wattles for their edible seeds; Davidson's Plum, desert lime, finger lime, quandong, riberry, Kakadu plum, muntries, bush tomato, Illawarra plum for fruit; warrigal greens as a leaf vegetable; and, lemon aspen, lemon myrtle, mountain pepper as spices. A few Australian native plants are used by the pharmaceutical industry, such as two scopolamine and hyoscyamine producing Duboisia species and Solanum aviculare and S. laciniatum for the steroid solasodine. Essential oils from Melaleuca , Callitris , Prostanthera , Eucalyptus and Eremophila are also used medicinally. Due to the wide variety of flowers and foliage, Australian plant species are also popular for floriculture internationally.
|National tree||Golden Wattle tree (Acacia pycnantha)|
|National flower||Golden Wattle blossom (Floral Emblem of Australia)|
|National fruit||Ribery (Syzygium luehmannii)|
|National vegetable||Sweetcorn (Zea mays)|
|National crops|| Wheat (Triticum aestivum)|
Oats (Avena sativa)
Modification of the Australian environment by Indigenous Australians and following European settlement has affected the extent and the distribution of the flora.
The changes since 1788 have been rapid and significant: displacement of Indigenous Australians disrupted fire régimes that had been in place for thousands of years; forestry practices have modified the structure of native forests; wetlands have been filled in; and broad scale land-clearing for crops, grazing and urban development has reduced native vegetation cover and led to landscape salinisation, increased sediment, nutrient and salt loads in rivers and streams, loss of habitat and a decline in biodiversity.The intentional and unintentional release of invasive plant and animal species into delicate ecosystems is a major threat to floral biodiversity; 20 introduced species have been declared Weeds of National Significance.
Since European settlement of Australia, 61 plant species are known to have become extinct; a further 1,239 species are presently considered threatened.
Protected areas have been created in every state and territory to protect and preserve the country's unique ecosystems. These protected areas include national parks and other reserves, as well as 64 wetlands registered under the Ramsar Convention and 16 World Heritage Sites. As of 2002, 10.8% (774,619.51 km²) of the total land area of Australia is within protected areas. Protected marine zones have been created in many areas to preserve marine biodiversity; as of 2002, these areas cover about 7% (646,000 km²) of Australia's marine jurisdiction.
The Australian Government's Threatened Species Scientific Committee has identified 15 biodiversity hotspots in Australian and 85 characteristic ecosystems, as classified by the Interim Biogeographic Regionalisation for Australia, cover the continent; some effort is being made to ensure each is represented within a protected area under Australia's Biodiversity Action Plan.
Region specific articles
Sclerophyll is a type of vegetation that has hard leaves, short internodes and leaf orientation parallel or oblique to direct sunlight. The word comes from the Greek sklēros (hard) and phyllon (leaf).
The Antarctic flora is a distinct community of vascular plants which evolved millions of years ago on the supercontinent of Gondwana. It is now found on several separate areas of the Southern Hemisphere, including southern South America, southernmost Africa, New Zealand, Australia and New Caledonia. Joseph Dalton Hooker was the first to notice similarities in the flora and speculated that Antarctica had served as either a source or a transitional point, and that land masses now separated might formerly have been adjacent.
Acacia aneura, commonly known as mulga or true mulga, is a shrub or small tree native to arid outback areas of Australia. It is the dominant tree in the habitat that it gives its name to (mulga) that occurs across much of inland Australia. Specific regions have been designated the Western Australian mulga shrublands in Western Australia and Mulga Lands in Queensland.
The Australian National Botanic Gardens (ANBG) are heritage-listed botanic gardens located in, Canberra, in the Australian Capital Territory, Australia. Established in 1949, the Gardens are administered by the Australian Government's Department of the Environment and Energy. The botanic gardens were added to the Commonwealth Heritage List on 22 June 2004.
Laurel forest, also called laurisilva or laurissilva, is a type of subtropical forest found in areas with high humidity and relatively stable, mild temperatures. The forest is characterized by broadleaf tree species with evergreen, glossy and elongated leaves, known as "laurophyll" or "lauroid". Plants from the laurel family (Lauraceae) may or may not be present, depending on the location.
The biodiversity of New Caledonia is of exceptional biological and paleoecological interest. It is frequently referred to as a biodiversity hotspot. The country is a large South Pacific archipelago with a total land area of more than 18,000 square kilometres (6,900 sq mi). The terrain includes a variety of reefs, atolls, small islands, and a variety of topographical and edaphic regions on the largest island, all of which promote the development of unusually concentrated biodiversity. The region's climate is oceanic and tropical.
The New Caledonia rain forests are a terrestrial ecoregion, located in New Caledonia in the South Pacific. It is a tropical moist broadleaf forest ecoregion, part of the Australasian realm.
The Proteaceae are a family of flowering plants predominantly distributed in the Southern Hemisphere. The family comprises 83 genera with about 1,660 known species. Together with the Platanaceae and Nelumbonaceae, they make up the order Proteales. Well-known genera include Protea, Banksia, Embothrium, Grevillea, Hakea and Macadamia. Species such as the New South Wales waratah, king protea, and various species of Banksia, Grevillea, and Leucadendron are popular cut flowers, while the nuts of Macadamia integrifolia are widely grown commercially and consumed. Australia and South Africa have the greatest concentrations of diversity.
Acacia mearnsii is a leguminous, fast growing,forest tree native to south-eastern Australia and Tasmania, which is considered one of the worst invasive species in the world. Common names for it include black wattle, Acácia-negra (Portuguese), Australian acacia, Australische Akazie (German), Swartwattel (Afrikaans), Uwatela (Zulu).
Warren, also known as Karri Forest Region and the Jarrah-Karri forest and shrublands ecoregion, is a biogeographic region in southern Western Australia. Located in the southwest corner of Western Australia between Cape Naturaliste and Albany, it is bordered to the north and east by the Jarrah Forest region. Its defining characteristic is an extensive tall forest of Eucalyptus diversicolor (karri). This occurs on dissected, hilly ground, with a moderately wet climate. Karri is a valuable timber and much of the karri forest has been logged over, but less than a third has been cleared for agriculture. Recognised as a region under the Interim Biogeographic Regionalisation for Australia (IBRA), and as a terrestrial ecoregion by the World Wide Fund for Nature, it was first defined by Ludwig Diels in 1906.
This article attempts to place key plant innovations in a geological context. It concerns itself only with novel adaptations and events that had a major ecological significance, not those that are of solely anthropological interest. The timeline displays a graphical representation of the adaptations; the text attempts to explain the nature and robustness of the evidence.
Cardwellia is a genus of a sole described species of large trees in the plant family Proteaceae. The species Cardwellia sublimis is endemic to the rainforests of the wet tropics region of northeastern Queensland, Australia. Other common names include bull oak, golden spanglewood, lacewood, oak and oongaary. The compound leaves have up to 17 leaflets. It produces white inflorescences followed by woody fruits which are prominently displayed outside the canopy.
The biodiversity of Tasmania is of exceptional biological and paleoecological interest. A state of Australia, it is a large South Pacific archipelago of one large main island and a range of smaller islands. The terrain includes a variety of reefs, atolls, many small islands, and a variety of topographical and edaphic regions on the largest island, all of which promote the development of unusually concentrated biodiversity. During long periods geographically and genetically isolated, it is known for its unique flora and fauna. The region's climate is oceanic.
Acacia argyrodendron, known colloquially as black gidyea or blackwood, is a species of Acacia native to Australia. Czech botanist Karel Domin described this species in 1926 and it still bears its original name. Domin reported collecting the type specimen from somewhere between Camooweal and Burketown in northwestern Queensland, though it is more likely to have been northeast of Aramac.
Agastachys odorata, commonly known as the white waratah, is the sole member of the genus Agastachys in the protea family. It is an evergreen shrub to small tree and is endemic to the heaths and button grass sedgelands of western Tasmania. It occurs most often in moist heath and scrub and occasionally in the alpine regions, but generally prefers well-drained but poor soils. It can grow in some rainforests where it forms a small tree but is normally a shrub in all other situations. The heaviest concentrations are along the island's south coast. Its leaves are dark green, hairless and almost succulent. Masses of white flowers are produced in erect spikes from the ends of the branches. Measuring 8 to 12 cm high, they appear in January and February.
Neorites is a genus of a sole described species of tall trees, constituting part of the plant family Proteaceae. The species Neorites kevedianus is endemic to the wet tropics rainforests of north eastern Queensland, Australia. The trees have the common names of the fishtail oak or fishtail silky oak.
Catalepidia is a genus of a sole described species of medium-sized trees, constituting part of the plant family Proteaceae. The species Catalepidia heyana grows naturally only in a restricted mountain region (endemic) of the wet tropics rain forests of north-eastern Queensland, Australia. Common names include Hey's nut or Hey's nut oak.
Nothorites is a genus of a sole described species of trees, constituting part of the plant family Proteaceae. The species Nothorites megacarpus grows naturally only in restricted mountain regions (endemic) of the wet tropics rain forests of north-eastern Queensland, Australia.
Lasjia is a genus of five species of trees of the family Proteaceae. Three species grow naturally in northeastern Queensland, Australia and two species in Sulawesi, Indonesia. Descriptively they are the tropical or northern macadamia trees group. Lasjia species characteristically branched compound inflorescences differentiate them from the Macadamia species, of Australia, which have characteristically unbranched compound inflorescences and only grow naturally about 1,000 km (620 mi) further to the south, in southern and central eastern Queensland and in northeastern New South Wales.
The Flora of Cape Verde includes the flowers and plants of Cape Verde, mostly native to the islands. There are about 240 species of plants.
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