Araucaria bidwillii, the bunya pine, is a large evergreen coniferous tree in the plant family Araucariaceae. It is found naturally in south-east Queensland Australia and two small disjunct populations in north eastern Queensland's World Heritage listed Wet Tropics. There are many fine old planted specimens in New South Wales, and around the Perth, Western Australia metropolitan area. They can grow up to 30–45 m.
The Bunya Pine is the last surviving species of the Section Bunya of the genus Araucaria. This section was diverse and widespread during the Mesozoic with some species having cone morphology similar to A. bidwillii, which appeared during the Jurassic. Fossils of Section Bunya are found in South America and Europe. The scientific name honours the botanist John Carne Bidwill, who sent the first specimens to Sir William Hooker in 1843.
Native in Queensland, historically trees were found in populations recorded as abundant and widespread in suitable habitats of South East Queensland and Wide Bay-Burnett (regions). In these regions of Queensland the natural ecosystems growing Bunya Pines have, sustained, European agricultural occupation and have been fragmented now into the areas of the: Blackall Range, Bunya Mountains, upper Brisbane River reaches and upper Mary River valley. Natural ecosystems having Bunya Pines are found again approximately 1,000 km (620 mi) to the north, in the wet tropics region of north eastern Queensland. There the species natural populations are rare and restricted. Two, outlying, restricted, populations are known in the Cannabullen Falls and Mt. Lewis areas.
A. bidwillii has a limited distribution within Australia in part because of the drying out of Australia with loss of rainforest and poor seed dispersal. The remnant sites at the Bunya Mountains and Mount Lewis in Queensland have genetic diversity. The cones are large, soft-shelled and nutritious and fall intact to the ground beneath the tree before dehiscing. The suggestion that extinct large animals – perhaps dinosaurs and, later, large mammals – may have been dispersers for the Bunya is reasonable, given the seeds' size and energy content, but difficult to confirm given the incompleteness of the fossil record for coprolites.
At the start of European occupation, A. bidwillii occurred in great abundance in southern Queensland, to the extent that a Bunya Bunya Reserve was declared in 1840 to protect its habitat. The tree once grew as large groves or sprinkled regularly as an emergent species throughout other forest types on the Upper Stanley and Brisbane Rivers, Sunshine Coast hinterland (especially the Blackall Range near Montville and Maleny), and also towards and on the Bunya Mountains. Today, the species is usually encountered as very small groves or single trees in its former range, except on and near the Bunya Mountains, where it is still fairly prolific.
A. bidwillii has unusual cryptogeal seed germination in which the seeds develop to form an underground tuber from which the aerial shoot later emerges. The actual emergence of the seed is then known to occur over several years presumably as a strategy to allow the seedlings to emerge under optimum climatic conditions or, it has been suggested, to avoid fire. This erratic germination has been one of the main problems in silviculture of the species.
Although there are no reported dispersal agents for the seeds of A. bidwillii, macropods and various species of rats are known as predators of the seeds and tubers. The bush rat (Rattus fuscipes) was observed caching bunya seeds some distance uphill from parent trees, possibly allowing ridge-top germination. Brushtail possums (Trichosurus spp.) were mentioned as carrying the seeds up trees. In a study in 2006, the short-eared possum (Trichosurus caninus) was shown to disperse the seed of A. bidwillii.
Natural populations of this species have been reduced in extent and abundance through exploitation for its timber, the construction of dams and historical clearing. Most populations are now protected in formal reserves and national parks.
A recent problem in small forestry plantations of A. bidwilli in Southeast Queensland is the introduction of red deer (Cervus elaphus). Red deer, unlike possums and rodents, eat bunya cones while still intact, preventing their dispersal.
The bunya, bonye, bunyi or bunya-bunya in various Australian Aboriginal languages was colloquially named the Bunya Pine by Europeans. However, Araucaria bidwillii is not a pine tree (of the genus Pinus). It belongs to the same genus as the monkey puzzle tree (Araucaria araucana) and is commonly referred to as the "false monkey puzzle".
The Bunya tree grows to a height of 30–45 metres, and the cones, which contain the edible kernels, are the size of footballs.
The ripe cones fall to the ground. Each segment contains a kernel in a tough protective shell, which will split when boiled or put in a fire. The flavour of the kernel is similar to a chestnut.
A Bunya festival was recorded by Thomas (Tom) Petrie (1831–1910), who went with the Aboriginal people of Brisbane at the age of 14 to the festival at the Bunya Range (now the Blackall Range in the hinterland area of the Sunshine Coast). His daughter, Constance Petrie, put down his stories in which he said that the trees fruited at three-year intervals. The three-year interval may not be correct. Ludwig Leichhardt wrote in 1844 of his expedition to the Bunya feast. The Bunya trees pollinate in South East Queensland in September, October and the cones fall seventeen to eighteen months later in late January to early March from the coast to the current Bunya Mountains. When there is heavy rainfall or drought, pollination may vary. The large festival harvests may vary between two and seven years. When the fruit was ripe, the people of the region would set aside differences and gather in the Bon-yi Mountains (Bunya Mountains) to feast on the kernels.
As the fruit ripened, locals, who were bound by custodial obligations and rights, sent out messengers to invite people from hundreds of kilometres to meet at specific sites. The meetings involved ceremonies, dispute settlements and fights, marriage arrangements and the trading of goods. The Aborigines’ fierce protection of the trees and recognition of the value of the timber, led to colonial authorities prohibiting settlers from cutting the trees in the 1842. The resource was too valuable, and the aboriginals were driven out of the forests along with the ability to run the festivals. The forests were felled for timber and cleared to make way for cultivation.
In what was probably Australia's largest indigenous event, diverse tribes – up to thousands of people – once travelled great distances (from as far as Charleville, Dubbo, Bundaberg and Grafton) to the gatherings. They stayed for months, to celebrate and feast on the bunya nut. The bunya gatherings were an armistice accompanied by much trade exchange, and discussions and negotiations over marriage and regional issues. Due to the sacred status of the bunyas, some tribes would not camp amongst these trees. Also in some regions, the tree was never to be cut.
Indigenous Australians eat the nut of the bunya tree both raw and cooked (roasted, and in more recent times boiled), and also in its immature form. Traditionally, the nuts were additionally ground and made into a paste, which was eaten directly or cooked in hot coals to make bread. The nuts were also stored in the mud of running creeks, and eaten in a fermented state. This was considered a delicacy.
Apart from consuming the nuts, Indigenous Australians ate bunya shoots, and utilised the tree's bark as kindling.
Bunya nuts are still sold as a regular food item in grocery stalls and street-side stalls around rural southern Queensland. Some farmers in the Wide Bay/ Sunshine Coast regions have experimented with growing bunya trees commercially for their nuts and timber.
Since the mid-1990s, the Australian company Maton has used bunya for the soundboards of its BG808CL Performer acoustic guitars. The Cole Clark company (also Australian) uses bunya for the majority of its acoustic guitar soundboards. The timber is valued by cabinet makers and woodworkers, and has been used for that purpose for over a century.
However its most popular use is as a 'bushfood' by indigenous foods enthusiasts. A huge variety of home-invented recipes now exists for the bunya nut; from pancakes, biscuits and breads, to casseroles, to 'bunya nut pesto' or hoummus. The nut is considered nutritious, with a unique flavour similar to starchy potato and chestnut. The nutritional content of the bunya nut is: 40% water, 40% complex carbohydrates, 9% protein, 2% fat, 0.2% potassium, 0.06% magnesium. It is also gluten free, making bunya nut flour a substitute for people with gluten intolerance.
Bunya nuts are slow to germinate. A set of 12 seeds sown in Melbourne took an average of about six months to germinate (with the first germinating in 3 months) and only developed roots after 1 year. The first leaves form a rosette and are dark brown. The leaves only turn green once the first stem branch occurs. Unlike the mature leaves, the young leaves are relatively soft. As the leaves age they become very hard and sharp.
In the highly variable Australian climate, the spread of actual emergence of the bunya maximises the possibility of at least successful replacement of the parent tree. A test of germination was carried out by Smith starting in 1999. Seeds were extracted from two mature cones collected from the same tree, a cultivated specimen at Petrie, just north of Brisbane (originally the homestead of Thomas Petrie, the son of the first European to report the species). One hundred apparently full seeds were selected and planted into 30 cm by 12 cm plastic tubes commercially filled with sterile potting mix in early February 1999. These were then placed in a shaded area and watered weekly. Four tubes were lost due to being knocked over. Of a total of 100 seeds placed, 87 germinated. The tubes were checked monthly for emergence over 3 years. Of these seeds, 55 emerged from April to December, 1999; 32 emerged from January to September in 2000, 1 seed emerged in January 2001, and the last 1 appeared in February 2001.
Once established bunyas are quite hardy and can be grown as far south as Hobart in Australia (42° S) and Christchurch in New Zealand (43° S) and (at least) as far north as Sacramento in California (38° N) and Lisbon (in the botanical garden) and even in Dublin area in Ireland (53ºN) in a microclimate protected from arctic winds and moderated by the Gulf Stream. They will reach a height of 35 to 40 metres, and live for about 500 years.
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