''Gahnia'' (sawsedge, saw-sedge) is a

genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...

sedge The Cyperaceae () are a family of graminoid (grass-like), monocotyledonous flowering plants known as wikt:sedge, sedges. The family (biology), family is large; botanists have species description, described some 5,500 known species in about 90 ...

s native to

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New Zealand New Zealand () is an island country in the southwestern Pacific Ocean. It consists of two main landmasses—the North Island () and the South Island ()—and List of islands of New Zealand, over 600 smaller islands. It is the List of isla ...

and a number of

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.Kew World Checklist of Selected Plant Families
/ref> The common name is due to the toothed margins. It often forms tussocks.

Species

Accepted species: *''

Gahnia ancistrophylla ''Gahnia ancistrophylla'', also known as hooked-leaf saw sedge, is a tussock-forming perennial in the family Cyperaceae, that is native to southern parts of Western Australia, South Australia South Australia (commonly abbreviated as SA) i ...

'' Benth. – Western Australia, South Australia, Victoria *'' Gahnia aristata'' Benth. – Western Australia *'' Gahnia aspera'' (R.Br.) Spreng. – Maluku, New Guinea, Queensland, New South Wales, Melanesia, Bonin Islands, Hawaii *'' Gahnia australis'' (Nees) K.L.Wilson – Western Australia *'' Gahnia baniensis'' Benl. – Fujian, Guangdong, Guangxi, Hainan, Vietnam, Borneo, Malaysia, Sumatra *'' Gahnia beecheyi'' H.Mann – forest sawsedge – Hawaii *'' Gahnia clarkei'' Benl – New Guinea, New South Wales, Queensland, Victoria *'' Gahnia decomposita'' (R.Br.) Benth. – Western Australia *'' Gahnia deusta'' (R.Br.) Benth. – Western Australia, South Australia, Victoria *'' Gahnia drummondii'' (Steud.) K.L.Wilson – Western Australia *'' Gahnia erythrocarpa'' R.Br. – New South Wales *'' Gahnia filifolia'' (C.Presl) Kük. ex Benl – New South Wales *'' Gahnia filum'' (Labill.) F.Muell.— chaffy sawsedge – Australia, all states except Queensland *'' Gahnia graminifolia'' Rodway – Tasmania *''

Gahnia grandis ''Gahnia grandis'' is a Bunch grass, tussock-forming perennial plant found in southeastern mainland Australia and Tasmania. Originally described by botanist Jacques Labillardière as ''Scleria grandis'' in 1800, it was placed in its current gen ...

'' (Labill.) S.T.Blake – Queensland, New South Wales, Victoria *'' Gahnia halmaturina'' R.L.Barrett & K.L.Wilson – South Australia *'' Gahnia howeana'' R.O.Gardner – Lord Howe Island *'' Gahnia hystrix'' J.M.Black – Kangaroo Island *'' Gahnia insignis'' S.T.Blake – Queensland, New South Wales *'' Gahnia javanica'' Moritzi – Yunnan, Vietnam, Malaysia, Borneo, Java, Sumatra, Sulawesi, Philippines, New Guinea, Solomon Islands *'' Gahnia lacera'' (R.Lesson ex A.Rich.) Steud. – Cutty grass – New Zealand North Island *'' Gahnia lanaiensis'' O.Deg., I.Deg. & J.Kern -- Lanaʻi sawsedge – Lanaʻi Island of Hawai'i *'' Gahnia lanigera'' (R.Br.) Benth. – Western Australia, South Australia, Victoria, New South Wales *'' Gahnia marquisensis'' F.Br. – Marquesas *'' Gahnia melanocarpa'' R.Br. – Black-fruit saw-sedge – Queensland, New South Wales, Victoria *'' Gahnia microcarpa'' Guillaumin – New Caledonia *'' Gahnia microstachya'' Benth. – Victoria, New South Wales, Tasmania *'' Gahnia novocaledonensis'' Benl – New Caledonia *'' Gahnia pauciflora'' Kirk – Cutting sedge – New Zealand North and South Islands *'' Gahnia procera'' J.R.Forst. & G.Forst. – Mountain sedge – New Zealand North and South Islands *'' Gahnia radula'' (R.Br.) Benth. – Thatch saw-sedge – Victoria, New South Wales, Tasmania, South Australia *''

Gahnia rigida ''Gahnia rigida'' is a tussock-forming perennial in the family Cyperaceae, that is native to parts of New Zealand New Zealand () is an island country in the southwestern Pacific Ocean. It consists of two main landmasses—the North ...

'' Kirk – New Zealand North and South Islands *'' Gahnia schoenoides'' G.Forst. – Society Islands *'' Gahnia sclerioides'' K.L.Wilson – Western Australia *'' Gahnia setifolia'' Hook.f. – Māpere, razor sedge – New Zealand North and South Islands *'' Gahnia sieberiana'' Kunth – Red-fruited saw sedge – Australia, New Guinea, Sulawesi, Solomon Islands, New Caledonia *'' Gahnia sinuosa'' J.Raynal – New Caledonia *''

Gahnia subaequiglumis ''Gahnia subaequiglumis'' is a tussock-forming perennial in the family Cyperaceae, that is native to eastern parts of Australia from south eastern Queensland to Victoria Victoria most commonly refers to: * Queen Victoria (1819–1901), Que ...

'' S.T.Blake – Queensland, New South Wales, Victoria *'' Gahnia trifida'' Labill. – Coast saw-sedge – Victoria, South Australia, Tasmania, Western Australia *'' Gahnia tristis'' Nees in W.J.Hooker & G.A.W.Arnott – China, Ryukyu Islands, Thailand, Vietnam, Borneo, Malaysia, Sumatra *'' Gahnia vitiensis'' Rendle -- Fijian sawsedge – Fiji, Hawaii *'' 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 Endemism is the state of a species being found only in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also foun ...

plant from the

Hawaii Hawaii ( ; ) is an island U.S. state, state of the United States, in the Pacific Ocean about southwest of the U.S. mainland. One of the two Non-contiguous United States, non-contiguous U.S. states (along with Alaska), it is the only sta ...

an island of

Lanai Lānai is the sixth-largest of the Hawaiian Islands and the smallest publicly accessible inhabited island in the chain. It is colloquially known as the Pineapple Island because of its past as an island-wide pineapple plantation. The island's on ...

and it was federally listed as an

endangered species An endangered species is a species that is very likely to become extinct in the near future, either worldwide or in a particular political jurisdiction. Endangered species may be at risk due to factors such as habitat loss, poaching, inv ...

of the United States. In 2010, however, research suggested that the Lanai plants are actually '' Gahnia lacera'' introduced from

in the early 20th century.Koyama, T. (2010)
On the identity of ''Gahnia lanaiensis'' O. Deg., I. Deg. & J. Kern (Cyperaceae) of Hawai‘i.
''Records of the Hawaii Biological Survey for 2008'' Evenhuis, N. L. and L. G. Eldredge, Eds. ''Bishop Museum Occasional Papers'' 107: 29–32.

References

{{Taxonbar, from=Q977615 Cyperaceae genera