# Gahnia

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***Gahnia*** (**sawsedge**, **saw-sedge**) is a [genus](/source/Genus) of [sedges](/source/Cyperaceae) native to [China](/source/China), [Southeast Asia](/source/Southeast_Asia), [New Guinea](/source/New_Guinea), [Australia](/source/Australia), [New Zealand](/source/New_Zealand) and a number of [Pacific Islands](/source/Pacific_Islands).[1][2][3][4] The common name is due to the toothed margins.[4] It often forms [tussocks](/source/Tussock_(grass)).

## Species

Accepted species:[1]

- *[Gahnia ancistrophylla](/source/Gahnia_ancistrophylla)* Benth. – Western Australia, South Australia, Victoria
- *[Gahnia aristata](/source/Gahnia_aristata)* Benth. – Western Australia
- *[Gahnia aspera](/source/Gahnia_aspera)* (R.Br.) Spreng. – Maluku, New Guinea, Queensland, New South Wales, Melanesia, Bonin Islands, Hawaii
- *[Gahnia australis](/source/Gahnia_australis)* (Nees) K.L.Wilson – Western Australia
- *[Gahnia baniensis](/source/Gahnia_baniensis)* Benl. – Fujian, Guangdong, Guangxi, Hainan, Vietnam, Borneo, Malaysia, Sumatra
- *[Gahnia beecheyi](/source/Gahnia_beecheyi)* H.Mann – forest sawsedge – Hawaii
- *[Gahnia clarkei](/source/Gahnia_clarkei)* Benl – New Guinea, New South Wales, Queensland, Victoria
- *[Gahnia decomposita](/source/Gahnia_decomposita)* (R.Br.) Benth. – Western Australia
- *[Gahnia deusta](/source/Gahnia_deusta)* (R.Br.) Benth. – Western Australia, South Australia, Victoria
- *[Gahnia drummondii](/source/Gahnia_drummondii)* (Steud.) K.L.Wilson – Western Australia
- *[Gahnia erythrocarpa](/source/Gahnia_erythrocarpa)* R.Br. – New South Wales
- *[Gahnia filifolia](/source/Gahnia_filifolia)* (C.Presl) Kük. ex Benl – New South Wales
- *[Gahnia filum](/source/Gahnia_filum)* (Labill.) F.Muell.— chaffy sawsedge – Australia, all states except Queensland[5]
- *[Gahnia graminifolia](/source/Gahnia_graminifolia)* Rodway – Tasmania
- *[Gahnia grandis](/source/Gahnia_grandis)* (Labill.) S.T.Blake – Queensland, New South Wales, Victoria
- *[Gahnia halmaturina](/source/Gahnia_halmaturina)* R.L.Barrett & K.L.Wilson – South Australia
- *[Gahnia howeana](/source/Gahnia_howeana)* R.O.Gardner – Lord Howe Island
- *[Gahnia hystrix](/source/Gahnia_hystrix)* J.M.Black – Kangaroo Island
- *[Gahnia insignis](/source/Gahnia_insignis)* S.T.Blake – Queensland, New South Wales
- *[Gahnia javanica](/source/Gahnia_javanica)* Moritzi – Yunnan, Vietnam, Malaysia, Borneo, Java, Sumatra, Sulawesi, Philippines, New Guinea, Solomon Islands
- *[Gahnia lacera](/source/Gahnia_lacera)* (R.Lesson ex A.Rich.) Steud. – Cutty grass – New Zealand North Island
- *[Gahnia lanaiensis](/source/Gahnia_lanaiensis)* O.Deg., I.Deg. & J.Kern -- [Lanaʻi](/source/Lana%CA%BBi) sawsedge – Lanaʻi Island of Hawai'i
- *[Gahnia lanigera](/source/Gahnia_lanigera)* (R.Br.) Benth. – Western Australia, South Australia, Victoria, New South Wales
- *[Gahnia marquisensis](/source/Gahnia_marquisensis)* F.Br. – Marquesas
- *[Gahnia melanocarpa](/source/Gahnia_melanocarpa)* R.Br. – Black-fruit saw-sedge – Queensland, New South Wales, Victoria
- *[Gahnia microcarpa](/source/Gahnia_microcarpa)* Guillaumin – New Caledonia
- *[Gahnia microstachya](/source/Gahnia_microstachya)* Benth. – Victoria, New South Wales, Tasmania
- *[Gahnia novocaledonensis](/source/Gahnia_novocaledonensis)* Benl – New Caledonia
- *[Gahnia pauciflora](/source/Gahnia_pauciflora)* Kirk – Cutting sedge – New Zealand North and South Islands
- *[Gahnia procera](/source/Gahnia_procera)* J.R.Forst. & G.Forst. – Mountain sedge – New Zealand North and South Islands
- *[Gahnia radula](/source/Gahnia_radula)* (R.Br.) Benth. – Thatch saw-sedge – Victoria, New South Wales, Tasmania, South Australia
- *[Gahnia rigida](/source/Gahnia_rigida)* Kirk – New Zealand North and South Islands
- *[Gahnia schoenoides](/source/Gahnia_schoenoides)* G.Forst. – Society Islands
- *[Gahnia sclerioides](/source/Gahnia_sclerioides)* K.L.Wilson – Western Australia
- *[Gahnia setifolia](/source/Gahnia_setifolia)* Hook.f. – Māpere, razor sedge – New Zealand North and South Islands
- *[Gahnia sieberiana](/source/Gahnia_sieberiana)* Kunth – Red-fruited saw sedge – Australia, New Guinea, Sulawesi, Solomon Islands, New Caledonia
- *[Gahnia sinuosa](/source/Gahnia_sinuosa)* J.Raynal – New Caledonia
- *[Gahnia subaequiglumis](/source/Gahnia_subaequiglumis)* S.T.Blake – Queensland, New South Wales, Victoria
- *[Gahnia trifida](/source/Gahnia_trifida)* Labill. – Coast saw-sedge – Victoria, South Australia, Tasmania, Western Australia[6]
- *[Gahnia tristis](/source/Gahnia_tristis)* Nees in W.J.Hooker & G.A.W.Arnott – China, Ryukyu Islands, Thailand, Vietnam, Borneo, Malaysia, Sumatra
- *[Gahnia vitiensis](/source/Gahnia_vitiensis)* Rendle -- Fijian sawsedge – Fiji, Hawaii
- *[Gahnia xanthocarpa](/source/Gahnia_xanthocarpa)* (Hook.f.) Hook.f. – Māpere, gahnia – New Zealand North and South Islands

## Conservation

The species *Gahnia lanaiensis* has been known as a rare [endemic](/source/Endemism) plant from the [Hawaiian](/source/Hawaii) island of [Lanai](/source/Lanai) and it was federally listed as an [endangered species](/source/Endangered_species) of the United States. In 2010, however, research suggested that the Lanai plants are actually *[Gahnia lacera](/source/Gahnia_lacera)* [introduced](/source/Introduced_species) from [New Zealand](/source/New_Zealand) in the early 20th century.[7]

## References

1. [Kew World Checklist of Selected Plant Families](http://apps.kew.org/wcsp/namedetail.do?name_id=246442)

1. [Flora of China, Vol. 23 Page 257, 黑莎草属 hei suo cao shu, *Gahnia* J. R. Forster & G. Forster, Char. Gen. Pl. 26. 1775.](http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=113129)

1. Govaerts, R. & Simpson, D.A. (2007). World Checklist of Cyperaceae. Sedges: 1-765. The Board of Trustees of the Royal Botanic Gardens, Kew.

1. Darke, Rick (2007). [*The Encyclopedia of Grasses for Livable Landscapes*](https://archive.org/details/encyclopediagras00dark). [Timber Press](/source/Timber_Press). p. [484](https://archive.org/details/encyclopediagras00dark/page/n484). ISBN 978-0-88192-817-4.

1. ["Cherry Lake and Truganina Swamp"](https://web.archive.org/web/20080722205041/http://melbournewater.com.au/content/library/rivers_and_creeks/wetlands/case_studies/cherry_lake_and_truganina_swamp.pdf). *Infostream*. [Melbourne Water](/source/Melbourne_Water). November 2000. Archived from [the original](http://www.melbournewater.com.au/content/library/rivers_and_creeks/wetlands/case_studies/cherry_lake_and_truganina_swamp.pdf) on 2008-07-22. Retrieved 2008-04-02.

1. Koyama, T. (2010). [On the identity of *Gahnia lanaiensis* O. Deg., I. Deg. & J. Kern (Cyperaceae) of Hawai‘i.](http://hbs.bishopmuseum.org/pubs-online/pdf/op107p29.pdf) *Records of the Hawaii Biological Survey for 2008* Evenhuis, N. L. and L. G. Eldredge, Eds. *Bishop Museum Occasional Papers* 107: 29–32.

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