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Brachychiton acerifolius
In full flower at Wagga Wagga, New South Wales
Conservation status
Least Concern (NCA)
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Rosids
Order:	Malvales
Family:	Malvaceae
Genus:	Brachychiton
Species:	B. acerifolius
Binomial name
Brachychiton acerifolius (A.Cunn. ex G.Don) F.Muell.
Synonyms
Brachychiton acerifolius Macarthur & C.Moore Brachychiton acerifolius var. typicum Terrac. Clompanus acerifolia (G.Don) Kuntze Sterculia acerifolia A.Cunn. ex G.Don

Brachychiton acerifolius is a large tree of the family Malvaceae endemic to tropical and subtropical regions on the east coast of Australia. It is famous for the bright red bell-shaped flowers that often cover the whole tree when it is leafless. It is commonly known as the flame tree, Illawarra flame tree, lacebark tree, or (along with other members of the genus) kurrajong.

Description

This species is a large deciduous tree, which forms a pyramidal habit. It may reach 30 to 35 m (98 to 115 ft) in height in its natural habitat, but is usually shorter in cultivation. The trunk is smoothly cylindrical and green or grey-green in colour, often tapering unbranched to the very tip of the tree. Leaves have long petioles and measure up to 30 cm (12 in) x 25 cm (9.8 in). They are glossy green, glabrous, simple, alternate, and highly variable in shape—they may be entire and ovate or up to 5-lobed.

Flowers are bright red or scarlet in colour, bell-shaped when viewed from the side and star-shaped when viewed end-on, about 25 to 30 mm (1.0 to 1.2 in) long by 16 to 22 mm (0.6 to 0.9 in) wide, and are produced on large panicles. They have five petals, fused at the base and free at the ends. The ensuing fruits are a dehiscent pod which is dark brown, leathery, boat-shaped and about 10 cm (3.9 in) long. They ripen around May to August in Australia, splitting along one side to reveal two rows of yellow seeds numbering 12–26, each around 10 by 5 mm (0.4 by 0.2 in) and surrounded by a papery aril covered in stiff hairs, which are very irritating if touched.

Distribution and habitat

Brachychiton acerifolius is found in well developed coastal rainforests from southern New South Wales to far north Queensland. In Cape York Peninsula and northeast Queensland the altitudinal range is from sea level to 1,000 m (3,300 ft). It also grows in drier, more seasonal forests.

Cultivation and uses

B. acerifolius is very popular as an ornamental tree both in its native Australia and around the world. The flowering is a spectacular event, as it sheds its leaves just prior to producing masses of bright scarlet flowers over the entire tree. It is used for street plantings, public parks and gardens, and in private gardens. It is easily grown and may be propagated from seed, cuttings, or by grafting.

In the New South Wales local government area of Northern Beaches, the Illawarra flame tree is included in a list of trees that are exempt from the need to request Council's consent prior to removal.

The seeds of Brachychiton species are edible—Indigenous Australians ate them either raw or roasted after removing the irritating hairs that surround them in the pod. They are nutritious, containing 18% protein and 25% fat with high levels of zinc and magnesium. They also ate the roots of young trees.

Ecology

This species is a host plant for the larvae of the pencilled blue, shining pencil-blue, common aeroplane and tailed emperor butterflies. The seeds are eaten by Australian king parrots and the regent and satin bowerbirds.

Taxonomy

The genus Brachychiton was traditionally placed in the family Sterculiaceae, but that family, along with Bombacaceae and Tiliaceae, has been found to be polyphyletic and is now sunk into a more broadly-defined Malvaceae.

Brachychiton acerifolius was first described in 1855 by W. Macarthur and C. Moore. It is sometimes spelled as Brachychiton acerifolium, under the assumption that the genus name Brachychiton is (Greek) neuter. In fact, Brachychiton is masculine (it is a bahuvrihi, and its first component is the descriptive component), and hence the correct species epithet is acerifolius. The name Brachychiton is derived from the Greek brachys meaning 'short' and chiton 'tunic', as a reference to the coating on the seed. The specific epithet acerifolius suggests the appearance of the foliage is similar to that of the genus Acer, the maples.

In his landmark Flora Australiensis, English botanist George Bentham published the first key for the nine described species of Brachychiton, and relegated them to a section of Sterculia. Hence the Illawarra flame tree became Sterculia acerifolia. Von Mueller maintained his recognition of Brachychiton as a separate genus. German botanist Otto Kuntze challenged the generic name Sterculia in 1891, on the grounds that the name Clompanus took precedence. He republished the Illawarra flame tree as Clompanus Haenkeana.

Gallery

• Whole tree, showing the conical habit and the tapering trunk
• Trunk of a young tree
• Close-up of flower
• Collected flowers
• Flame Tree in full flower at Edge Hill State School, Queensland
• Flame tree flowering out of season in mid-April, Royal National Park, New South Wales
• Leaves
• Leaf with 5 lobes
• Leaf with very slight lobing
• Seed pods
• Seed pods
• Empty seed pods on tree
• Seeds removed from pod

References

1. "APC format - Brachychiton acerifolius". Australian Plant Census, (APC). Centre for Plant Biodiversity Research, Australian Government. Retrieved 30 December 2020.
2. "Brachychiton acerifolius". International Plant Names Index (IPNI). Royal Botanic Gardens, Kew; Harvard University Herbaria & Libraries; Australian National Botanic Gardens. Retrieved 30 December 2020.
3. ^ "Brachychiton acerifolius". Australian Tropical Rainforest Plants. Commonwealth Scientific and Industrial Research Organisation (CSIRO), Australian Government. Retrieved 31 December 2020.
4. ^ "Brachychiton acerifolius". PlantFile. PlantFileonlie.
5. "Brachychiton acerifolius". Australian Native Plants Society (Australia) (ANPSA). Australian Native Plants Society (Australia). Retrieved 31 December 2020.
6. "Brachychiton acerifolius (A.Cunn. ex G.Don) F.Muell". PlantNET (The NSW Plant Information Network System). Royal Botanic Gardens and Domain Trust, Sydney. Retrieved 31 December 2020.
7. ^ Jones, David L. (1986). Rainforest Plants of Australia. Sydney, Australia: Reed Books. p. 198. ISBN 0-7301-0381-1.
8. ^ Cooper, Wendy; Cooper, William (2004). Fruits of the Australian Tropical Rainforest. Nokomis Editions. p. 528. ISBN 0-9581742-1-0.
9. ^ "Brachychitons, the Australian Bottle Trees". Dave's Garden. Retrieved 1 January 2021.
10. "Exempt Tree Species List | Northern Beaches Council". 19 November 2019.
11. Low, Tim (1991). Wild Food Plants of Australia (Revised ed.). Pymble, NSW: Collins Angus & Robertson Publishers Pty Limited. p. 183. ISBN 0-207-16930-6.
12. Stevens, Peter F. (29 January 2015). "Angiosperm Phylogeny Website". Retrieved 6 February 2015.
13. "Brachychiton acerifolius (A.Cunn. ex G.Don) Macarthur & C.Moore". Australian Plant Name Index (APNI), IBIS database. Centre for Plant Biodiversity Research, Australian Government.
14. ^ Guymer, Gordon Paul (1988). "A taxonomic revision of Brachychiton (Sterculiaceae)". Australian Systematic Botany. 1 (3): 199–323. doi:10.1071/SB9880199.
15. Bentham, George (1863). "Sterculia". Flora Australiensis: Volume 1: Ranunculaceae to Anacardiaceae. Vol. 1. London, United Kingdom: L. Reeve & Co. p. 229.
16. Kuntze, Otto (1891). Revisio generum plantarum:vascularium omnium atque cellularium multarum secundum leges nomenclaturae internationales cum enumeratione plantarum exoticarum in itinere mundi collectarum. Vol. 1. Leipzig, Germany: A. Felix. p. 78.

External links

• View a map of historical sightings of this species at the Australasian Virtual Herbarium
• View observations of this species on iNaturalist
• View images of this species on Flickriver

• Nature Conservation Act least concern biota
• Brachychiton
• Trees of Australia
• Ornamental trees
• Malvales of Australia
• Flora of Queensland
• Flora of New South Wales
• Edible nuts and seeds
• Endemic flora of Australia