Plants of
South Australia
Cyperus exaltatus
Cyperaceae
Tall Flat-sedge
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Regional Species Conservation Assessments per IBRA subregion.
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Near threatened
Rare
Vulnerable
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Adelaide
Arkaroola
Ceduna
Coober Pedy
Hawker
Innamincka
Marla
Marree
Mount Gambier
Oodnadatta
Renmark
Wudinna
Keith
Yunta
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Botanical art

Kath Alcock paintings: 2.

Etymology

Cyperus from the Latin 'cyperos' and derived from the Greek 'kypeiros', an ancient Greek name used by Homer and Theophrastus for several plants of this genus. Exaltatus means very tall.

Distribution and status

Found in the north, north-east and murray regions of South Australia, growing in shallow water and on banks of streams and lagoons. Also found in Northern Territory, Queensland, New South Wales and Victoria. Native. Common in South Australia. Common in the other states.
Herbarium regions: North Western, Lake Eyre, Flinders Ranges, Murray, Southern Lofty
NRM regions: Adelaide and Mount Lofty Ranges, Alinytjara Wilurara, South Australian Arid Lands, South Australian Murray-Darling Basin
AVH map: SA distribution map (external link)

Plant description

Stout tufted perennial sedge to I m high. Stems triquetrous, to 3 mm thick at the top. Leaves about as long as the stem, 3-10 mm wide, bracts 3-6, like the leaves, serrulate on the edges, the lower ones much exceeding the inflorescence (to 80 cm long). Flower-spikes an umbel compound, with several spreading rays; spikelets rather densely arranged in oblong or linear spikes at the end of the rays and their branches a rich deep-brown to golden-brown, mostly linear, 20-40-flowered, to 15 mm long, 1-1.5 mm wide; rhachilla winged; glumes tightly packed, mucronate, keeled, 3-5-nerved on the back and nerveless on the sides, c. 1.5 mm long; style 3-fid. Flowers in spring and summer. Fruits are flat, golden fruit-head in dense clusters. Seeds are pale brown ovoid triangular seed to 0.7 mm long and 0.5 mm wide. Seed embryo type is capitate.

Seed collection and propagation

Collect seeds between November and April. Collect fruits by picking off the mature heads, those turning a golden colour and come-off easily. Place the heads in a tray and leave to dry for one to two weeks. Then rub the heads with a rubber bung to dislodge the seeds. Use a sieve to separate any unwanted material. Be careful, as the seeds are very small. Seeds are pale brown, ovoid and hard. Store the seeds with a desiccant such as dried silica beads or dry rice, in an air tight container in a cool and dry place. From one collection, the seed viability was average, at 65%.

Seeds stored:
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LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA147,600 (5.67 g)20+1-Feb-2007RJB71295
Southern Lofty
1-Aug-200765%-18°C
Location: BGA — the seeds are stored at the Adelaide Botanic Gardens, MSB — the seeds are stored at the Millennium Seed Bank, Kew, England.
Number of plants: This is the number of plants from which the seeds were collected.
Collection location: The Herbarium of South Australia's region name.
% Viability: Percentage of filled healthy seeds determined by a cut test or x-ray.