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User:Junglenut/Castanospermum australe

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Blackbean
A street planting in
Cairns, Queensland
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Fabales
Family: Fabaceae
Subfamily: Faboideae
Tribe: Angylocalyceae
Genus: Castanospermum
A.Cunn ex Mudie[2][4]
Species:
C. australe
Binomial name
Castanospermum australe
A.Cunn. ex Mudie[2][3]

Castanospermum is a monotypic genus in the legume family Fabaceae. The sole species is Castanospermum australe, commonly known as blackbean or Moreton Bay chestnut,which is a rainforest tree native to the east coast of Australia and the Pacific islands of Vanuatu and New Caledonia. The large starchy seeds were a staple food source for Indigenous Australians. It has been widely used as a street and park tree, and can also be grown as an indoor potted plant.

Description edit

The blackbean is a large evergreen tree growing to 40 metres (130 ft) tall,[5] though commonly much smaller. The leaves are 15 centimetres (5.9 in) long and 6–7 centimetres (2.4–2.8 in) broad, pinnate, with 11-15 leaflets. The flowers are bicoloured red and yellow, 3–4 centimetres (1.2–1.6 in) long, produced in racemes 6 centimetres (2.4 in) long. The fruit is a cylindrical pod 12–20 centimetres (4.7–7.9 in) long and 4–6 centimetres (1.6–2.4 in) diameter, the interior divided by a spongy substance into one to five cells, each of which contains a large chestnut-like seed.

Taxonomy edit

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Etymology edit

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Vernacular names edit

The 1889 book 'The Useful Native Plants of Australia' records the common names of Castanospermum australe as "Moreton Bay Chestnut" and "Bean tree" and notes that it was called "Irtalie" by Aboriginal people of the Richmond and Clarence Rivers (New South Wales) and "Bogum" by "others of Northern New South Wales".[6] Other names used by Indigenous Australians are baway in the Guugu Yalandji language, yiwurra in the Djabugay language, junggurraa in the Yidiny language, mirrayn, ganyjuu, and binyjaalga in the Kumbainggar language.[7]

Distribution and habitat edit

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Spread edit

Due to its significance as a food for Aboriginal people, blackbean trees were spread by hand into mountain areas on the east coast of Australia. All the trees in New South Wales are descended from a single seed.[8] The plant naturally spreads by water.[9] It has been introduced to India, Malaysia, Papua New Guinea, Sri Lanka, South Africa and the United States of America.[5]

Uses edit

Chemicals edit

In 1981, castanospermine was isolated from the seeds.[10] Members of this and closely related genera accumulate iminosugars in their leaves.[11]

Cultural significance edit

Due to its importance as a food, the blackbean tree was a seasonal gathering point for Aboriginal peoples, and this acted as a catalyst for ceremonies.[8] Songlines featuring the black bean seeds have been collected.[9] The bark fibre has been used for fish and animal traps, nets and baskets, and the empty seed pods have been used as toy boats.[9] Additionally, the tree has been used as a seasonal signal for when to hunt jungle fowl.[9]

Food edit

The unprocessed seeds are poisonous since they contain toxic saponins,[12] and can cause vomiting and diarrhoea,[13] but they become edible when carefully prepared by roasting, cutting up into small pieces, leaching with running water for several days, and pounding into flour and roasting it as a damper.[14] The seeds have been prepared and eaten for at least 2,500 years.[15] The 1889 book 'The Useful Native Plants of Australia' notes and describes this use of the beans.[16] As of 2012, the food was not used in modern bush tucker, and there was no nutritional information available on the seeds.[5]

Ornamental use edit

The trees are popular as potted plants in Asia, Europe and America.[17] In addition, they have been used as shade trees in landscaping for parks.[5]

Wood edit

The wood was used by Aboriginal people for spear throwers.[9] The timber, which somewhat resembles walnut, is soft, fine-grained, and takes a good polish,[18] and the wood has a durability rating above-ground of over 40 years longevity.[19]

Gallery edit

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    Castanospermum australe flower
  •  
    Small C. australe tree
  •  
    Mature pod and seeds

References edit

  1. ^ "Species profile—Castanospermum australe". Queensland Department of Environment and Science. Queensland Government. 2022. Retrieved 27 October 2022.
  2. ^ a b "Castanospermum australe". Australian Plant Name Index (APNI). Centre for Plant Biodiversity Research, Australian Government. Retrieved 27 October 2022.
  3. ^ "Castanospermum australe A.Cunn. ex Mudie". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 27 October 2022.
  4. ^ "Castanospermum A.Cunn. ex Mudie". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 27 October 2022.
  5. ^ a b c d Lim, T.K. (1 January 2012). "Castanospermum australe". Edible Medicinal And Non-Medicinal Plants. Vol. 2. Springer Netherlands. pp. 593–600. doi:10.1007/978-94-007-1764-0_73. ISBN 978-94-007-1763-3.
  6. ^ J. H. Maiden (1889). The useful native plants of Australia : Including Tasmania. Turner and Henderson, Sydney. p. 396.
  7. ^ "Gumbaygnggirr Language Names" (PDF). National Parks and Wildlife Service. Retrieved 28 February 2018.
  8. ^ a b Miskelly, Greg (13 November 2017). "Aboriginal people spread native plants by hand: study". ABC News. Retrieved 13 November 2017.
  9. ^ a b c d e Rossetto, Maurizio; Ens, Emilie J.; Honings, Thijs; Wilson, Peter D.; Yap, Jia-Yee S.; Costello, Oliver; Round, Erich R.; Bowern, Claire; Borges, Renee M. (8 November 2017). "From Songlines to genomes: Prehistoric assisted migration of a rain forest tree by Australian Aboriginal people". PLOS ONE. 12 (11): e0186663. Bibcode:2017PLoSO..1286663R. doi:10.1371/journal.pone.0186663. PMC 5695580. PMID 29117184.
  10. ^ Hohenschutz, Liza D.; Bell, E.Arthur; Jewess, Phillip J.; Leworthy, David P.; Pryce, Robert J.; Arnold, Edward; Clardy, Jon (January 1981). "Castanospermine, A 1,6,7,8-tetrahydroxyoctahydroindolizine alkaloid, from seeds of Castanospermum australe". Phytochemistry. 20 (4): 811–814. doi:10.1016/0031-9422(81)85181-3.
  11. ^ Kite GC, Cardoso D, Lewis GP, Zartman CE, de Queiroz LP, Veitch NC (2015). "Monomethyl ethers of 4,5-dihydroxypipecolic acid from Petaladenium urceoliferum: Enigmatic chemistry of an enigmatic legume". Phytochemistry. 116: 198–202. doi:10.1016/j.phytochem.2015.02.026. PMID 25817832.
  12. ^ Orwa, C.; Mutua, A.; Kindt, R.; Jamnadass, R.; Simons, A. "Castanospermum_australe" (PDF). Agroforestree Database:a tree reference and selection guide version 4.0.
  13. ^ "Australia's most poisonous plants - Australian Geographic". Australian Geographic. 4 July 2012. Retrieved 14 November 2017.
  14. ^ Ancient Aboriginal process for cooking black beans. Royal Botanic Gardens. 12 November 2017. Archived from the original on 21 December 2021. Retrieved 14 November 2017.
  15. ^ "Black bean". Royal Botanic Gardens. Retrieved 14 November 2017.
  16. ^ J. H. Maiden (1889). The useful native plants of Australia : Including Tasmania. Turner and Henderson, Sydney. p. 15.
  17. ^ Jack, Helen (30 May 2007). "Bentley man says money does grow on trees". The Northern Star. Retrieved 13 November 2017.
  18. ^   This article incorporates text from a publication now in the public domain: Chisholm, Hugh, ed. (1911). "Moreton Bay Chestnut". Encyclopædia Britannica. Vol. 18 (11th ed.). Cambridge University Press. p. 831.
  19. ^ "Black bean". www.daf.qld.gov.au. Archived from the original on 13 November 2017. Retrieved 13 November 2017.

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External links edit

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