Biology:Themeda triandra

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Short description: Species of plant

Themeda triandra
Themeda triandra - kangaroo grass.jpg
Scientific classification edit
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Clade: Commelinids
Order: Poales
Family: Poaceae
Subfamily: Panicoideae
Genus: Themeda
Species:
T. triandra
Binomial name
Themeda triandra
Forssk.[1]
Synonyms[1]

Themeda triandra is a species of C4 perennial tussock-forming grass widespread in Africa, Australia, Asia and the Pacific. In Australia it is commonly known as kangaroo grass[2] and in East Africa and South Africa it is known as red grass and red oat grass or as rooigras in Afrikaans. Kangaroo grass was formerly thought to be one of two species, and was named Themeda australis.

The plant has traditional uses as food and medicine in Africa and Australia. Indigenous Australians harvested it to make bread and string for fishing nets around 30,000 years ago. It was used as livestock feed in early colonial Australia, but this use was largely replaced by introduced plants. (As of 2021) there is a large government-funded project under way to investigate the possibility of growing kangaroo grass commercially in Australia for use as a regular food source for humans.

Flowering spikelet, South Africa
Dry spikelets, South Africa
Single seed
Cultivated in a botanical garden

Description

Themeda triandra is a grass which grows in dense tufts up to 1.5 metres (4 ft 11 in) tall and 0.5 metres (1 ft 8 in) wide. It flowers in summer, producing large red-brown spikelets on branched stems.[3] The leaves are 10–30 centimetres (3.9–11.8 in) in length and 1–8 millimetres (0.039–0.315 in) wide[4] but can exceed 10–50 centimetres (3.9–19.7 in) long and 2–5 millimetres (0.079–0.197 in) wide.[3] Its inflorescence is compounded, fasciculated, is 10–30 centimetres (3.9–11.8 in) long and composed of a single raceme. It pedicels are oblong and are 0.5 mm long while its lemma is 25–70 millimetres (0.98–2.76 in) long and is both apical and geniculate. The column of lemma's awn is hispidulous and twisted.[4]

Its leaves are a grey-green colour in winter, turning red-brown in summer. The blooms exude a strong perfume.[5]

Taxonomy and naming

Themeda triandra was first formally described in 1775 by Peter Forsskål who published the description in Flora Aegyptiaco-Arabica.[6] There are many synonyms of this species.[7] The specific epithet (triandra) is the feminine of the Botanical Latin adjective triandrus, meaning "with three stamens",[8] based on the Greek-derived combining forms tri-, three, and -andrus, male.[9]

Kangaroo grass was formerly thought to be one of two species, and was named Themeda australis.[5]

Distribution and habitat

Themeda triandra is found across Asia, Africa, Australia, and the Pacific. In Australia, it is found in all of the states and territories.[3] It grows predominantly in grassland and open woodland communities. It is a significant species in temperate grasslands in Australia, a habitat considered to be endangered or threatened in various parts of the country.[3] It does not do well under heavy grazing pressure, but benefits from occasional fire.[10]

It tolerates a wide range of soils but is most common in moist microclimates such as roadsides and railway lines.[11]

T. triandra occurs on a wide variety of soils from sandy soils to heavy clays. There seems to be little association between abundance of T. triandra and a specific soil type. It is often common in areas where moisture collects and grazing is light, such as along roadsides or railway lines.

Morphology

Kangaroo grass is a tufted perennial up to 1.5m tall, with tussock width up to 0.5m. The narrow leaves grow up to 0.5m long, and are green in summer changing to straw coloured in winter. The seed head is large, often red-brown and made up of clustered spikelets.[12]

Uses

The young growth is palatable to livestock.[13][14] It serves as a food source for several avian species, including the long-tailed widowbird, and is occasionally used as an ornamental plant.[3]

Traditionally, in Uganda, the hollow stems of the grass are used as a thatch in hut construction, and for creating pulp for paper.[5] T. triandra seed has also been used as a famine food in Africa.[15] In West Africa, the root are used in the creation of a medicine used to treat dysmenorrhoea (painful periods).[16]

In Australia, it is sometimes used as an ornamental plant in rockeries, as a substitute for a lawn, and in cooking. It has also been found to be useful in treating horses for obesity, insulin resistance, and foot inflammation, because it is lower in carbohydrates such as sugar, starch, and fructans than introduced grasses.[5]

Before the colonisation of Australia, kangaroo grass used to be harvested by Aboriginal Australians, who used the leaves and stems for making string, the basis for fishing nets, as well as for food. The grains were harvested and ground into flour and porridge; the flour was used to make a traditional bread (later referred to as damper, although that term is mostly used for the bread made by non-Indigenous Australians), said to have a nutty flavour. Evidence has been found of this food production occurring around 30,000 years ago, with the grain considered to be a staple food and especially valuable in arid areas.[5]

However, in recent years kangaroo grass has been looked upon as a weed which is sometimes eaten by livestock. (As of 2021), a four-year research project[17] supported by the Australian Government[18] is being undertaken by researcher Dylan Male, at La Trobe University in collaboration with the Dja Dja Wurrung Aboriginal Clans Corporation of central Victoria, investigating the possibility of developing it as a food crop. It is hoped that kangaroo grass would be able to be grown on a commercial scale and become a regular food source. They have found tussocks of the grass estimated to be over 50 years old, an possibly unique among Australian grasses. The plant has several advantages over currently farmed grains:[17]

  • It can survive on land depleted by farming.
  • It is very drought-resistant.
  • It tolerates extreme changes in temperature.
  • It is a perennial grass.
  • It can help to restore already degraded grasslands.
  • It contains 40 per cent more protein than traditional grains used for making bread.
  • Because of the way it grows, forming a very dense tussock with its leaves bending outwards, it protects the soil and creates its own little ecosystem – it conserves moisture, creating habitat for small animals such as native insects and invertebrates.[19]

However, at present the commercial viability of kangaroo grass is limited by low seed yields and poor knowledge of broadacre crop management.[20]

The project will draw heavily on the knowledge of the traditional owners of the land, and there will be ongoing communication with farmers and Landcare Australia groups.[18]

The project follows a smaller, crowdfunded project undertaken in 2017 by writer Bruce Pascoe on his own property in Gipsy Point, eastern Victoria, managed by volunteers, to develop several Indigenous Australian food crops, including murnong (yam daisy), kangaroo grass and native raspberries.[21]

In 2020 Pascoe established the not-for-profit Aboriginal social enterprise Black Duck Foods in Mallacoota, Victoria. Black Duck Foods conducts research into native foods and is currently working on a roadmap for the native grains industry. They have small quantities of kangaroo and spear grass flour for sale on their website.[22]

The University of Sydney has undertaken research into the nutritional value of kangaroo grass, finding that it is high in protein and minerals.[23]

References

  1. ↑ 1.0 1.1 "Themeda triandra". Australian Plant Census. https://biodiversity.org.au/nsl/services/apc-format/display/55809. 
  2. ↑ "Themeda triandra - Plant Profiles - Queensland Native Seeds" (in en-us). https://qldnativeseeds.com.au/plant-profiles/themeda-triandra. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 Liles, Jennifer. "Themeda triandra". Australian National Botanic Garden. http://www.anbg.gov.au/gnp/interns-2004/themeda-triandra.html. 
  4. ↑ 4.0 4.1 W.D. Clayton; M. Vorontsova. "Themeda triandra". The Board of Trustees, Royal Botanic Gardens. Kew: GrassBase. https://www.kew.org/data/grasses-db/www/imp10323.htm. 
  5. ↑ 5.0 5.1 5.2 5.3 5.4 Fieldhouse, Rachel (28 September 2018). "Feature Plant Friday - Kangaroo Wheat Grass". https://www.ps.org.au/content/articles/2018/9/28/feature-plant-friday-kangaroo-wheat-grass. 
  6. ↑ "Themeda triandra". APNI. https://id.biodiversity.org.au/instance/apni/458089. 
  7. ↑ "Themeda triandra". World Checklist of Selected Plant Families (WCSP). Royal Botanic Gardens, Kew. http://wcsp.science.kew.org/namedetail.do?name_id=446468. 
  8. ↑ Stearn, W.T. (2004). Botanical Latin (4th (p/b) ed.). Portland, Oregon: Timber Press. ISBN 978-0-7153-1643-6.  p. 516.
  9. ↑ Stearn (2004), p. 368.
  10. ↑ "Themeda triandra (Kangaroo grass)". New South Wales Government Department of Primary Industries. https://www.dpi.nsw.gov.au/agriculture/pastures-and-rangelands/rangelands/publications-and-information/grassedup/species/kangaroo-grass. 
  11. ↑ "Themeda triandra (Kangaroo grass)" (in en). 2017. https://www.dpi.nsw.gov.au/agriculture/pastures-and-rangelands/rangelands/publications-and-information/grassedup/species/kangaroo-grass#:~:text=Themeda%20triandra%20is%20probably%20one,to%2012.4%25%20crude%20protein).. 
  12. ↑ "Themeda triandra (Kangaroo grass)" (in en). 2017. https://www.dpi.nsw.gov.au/agriculture/pastures-and-rangelands/rangelands/publications-and-information/grassedup/species/kangaroo-grass#:~:text=Themeda%20triandra%20is%20probably%20one,to%2012.4%25%20crude%20protein).. 
  13. ↑ Burbidge, N. T. Australian Grasses. Angus and Robertson Publishers. 1966.
  14. ↑ "Animal Feed Resources Information System". FAO.org. http://www.fao.org/AG/agA/AGAP/FRG/afris/Data/165.HTM. 
  15. ↑ "Wild Grains". The National Academies of Sciences Engineering Medicine. https://www.nap.edu/read/2305/chapter/17. 
  16. ↑ "Feature Plant Friday - Kangaroo Wheat Grass". Planting Seeds. https://www.ps.org.au/content/articles/2018/9/28/feature-plant-friday-kangaroo-wheat-grass. 
  17. ↑ 17.0 17.1 Lawrence, Sarah (8 February 2021). "Could native crop, kangaroo grass, become a regular ingredient in bread and help farmers regenerate land?". Australian Broadcasting Corporation. https://www.abc.net.au/news/2021-02-08/kangaroo-grass-quest-as-the-next-super-crop/13132462. 
  18. ↑ 18.0 18.1 Wheeler, Mike (19 December 2019). "Kangaroo Grass – is it the super crop for animal feed?". https://foodmag.com.au/kangaroo-grass-is-it-the-super-crop-for-animal-feed/. 
  19. ↑ Mata, Luis; Andersen, Alan N.; Morán‐Ordóñez, Alejandra; Hahs, Amy K.; Backstrom, Anna; Ives, Christopher D.; Bickel, Daniel; Duncan, David et al. (June 2021). "Indigenous plants promote insect biodiversity in urban greenspaces". Ecological Applications 31 (4): 9. doi:10.1002/eap.2309. 
  20. ↑ Male, Dylan; Hunt, James; Celestina, Corinne; Morgan, John; Gupta, Dorin (2022-12-31). "Themeda triandra as a perennial seed crop in south-eastern Australia: What are the agronomic possibilities and constraints, and future research needs?" (in en). Cogent Food & Agriculture 8 (1): 2153964. doi:10.1080/23311932.2022.2153964. ISSN 2331-1932. https://www.tandfonline.com/doi/full/10.1080/23311932.2022.2153964. 
  21. ↑ Fitzgerald, Bridget (9 January 2017). "Project to harvest and mill kangaroo grass aims to encourage farmers to adopt native Australian crops". Australian Broadcasting Corporation. https://www.abc.net.au/news/rural/2017-01-09/potential-for-farmers-to-grow-native-plants/8161212. 
  22. ↑ "Home | Black Duck Foods" (in en). https://www.blackduckfoods.com.au/. 
  23. ↑ Institute of Agriculture, the University of Sydney (September 2020). "Native grains from paddock to plate: study of the economic, environmental and social sustainability of an ancient system in a modern context". https://www.sydney.edu.au/content/dam/corporate/documents/faculty-of-science/research/life-and-environmental-sciences/sia-native-grains-paddock-to-plate.pdf. 

External links

Wikidata ☰ Q1038150 entry



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