Seeds of South Australia
Cyperus rigidellus (Cyperaceae)
Curly Flat-sedge
List of species for Cyperus
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Seed collecting:
May to November
Herbarium regions:
North Western, Lake Eyre, Gairdner-Torrens, Flinders Ranges, Eastern, Eyre Peninsula, Murray
NRM regions:
Alinytjara Wilurara, Eyre Peninsula, Northern and Yorke, South Australian Arid Lands, South Australian Murray-Darling Basin
IBRA regions
SUMMARY
Northern Flinders (FLB05)Flinders Lofty Block
 Data Deficient   [lack of records; probably not here]
Murray Mallee (MDD02)Murray Darling Depression
 Rare   (IUCN: RA d(i,ii))   (Probable Decline)
Murray Scroll Belt (RIV06)Riverina
 Rare   (IUCN: RA d(ii))   (Probable Decline)
Gawler Volcanics (GAW02)Gawler
 Rare   (IUCN: RA d(ii))
Gawler Lakes (GAW03) 
 Rare   (IUCN: RA d(ii))
Arcoona Plateau (GAW04) 
 Rare   (IUCN: RA d(ii))
Torrens (GAW06) 
 Data Deficient   [old record]
Roxby (GAW07) 
 Least Concern
Commonwealth Hill (GAW08) 
 Rare   (IUCN: RA d(i,ii))   [edge of range; limited habitat]
Tallaringa (GVD05)Great Victoria Desert
 Near Threatened
Curnamona (BHC06)Broken Hill Complex
 Least Concern   [ephemeral]
Dieri (SSD03)Simpson Strzelecki Dunefields
 Least Concern
Warriner (SSD04) 
 Least Concern
Strzelecki Desert (SSD05) 
 Least Concern
Breakaways (STP01)Stony Plains
 Near Threatened
Oodnadatta (STP02) 
 Least Concern
Murnpeowie (STP03) 
 Near Threatened
Witjira (STP06) 
 Least Concern
Baltana (STP07) 
 Least Concern
Sturt Stony Desert (CHC02)Channel Country
 Least Concern
Diamantina-Eyre (CHC04) 
 Least Concern
Coongie (CHC06) 
 Least Concern
Lake Pure (CHC07) 
 Least Concern
Mann-Musgrave Block (CER01)Central Ranges
 Near Threatened
IBRA regions
DISPLAY ALL
Northern Flinders (FLB05)Flinders Lofty BlockData Deficient
  [lack of records; probably not here]
Murray Mallee (MDD02)Murray Darling DepressionRare
  (IUCN: RA d(i,ii))   (Probable Decline)
Murray Scroll Belt (RIV06)RiverinaRare
  (IUCN: RA d(ii))   (Probable Decline)
6 of 8 subregionsGawlerLeast Concern
, Rare
, Data Deficient
Tallaringa (GVD05)Great Victoria DesertNear Threatened
Curnamona (BHC06)Broken Hill ComplexLeast Concern
  [ephemeral]
3 of 4 subregionsSimpson Strzelecki DunefieldsLeast Concern
5 of 7 subregionsStony PlainsLeast Concern
, Near Threatened
4 of 4 subregionsChannel CountryLeast Concern
Mann-Musgrave Block (CER01)Central RangesNear Threatened
RSCA map:
Regional Species Conservation Assessments per IBRA subregion. Please click the thumbnail map.
AVH map:
Australian distribution map (external link)
SA Census:
Census of South Australian plants (external link)     [genus Cyperus]
Name derivation:
Cyperus from the Latin 'cyperosand derived from the Greek 'kypeiros', an ancient Greek name used by Homer and Theophrastus for several plants of this genus. Rigidellus means slightly or nearly rigid.
Distribution:
Found in the northern part of South Australia, north of the Murray River, growing in ephemerally wet situations such as lake beds, floodways and roadside drains. Also found in all mainland states.
Status:
Native. Common in South Australia. Rare in Victoria. Common in the other states.
Plant description:
Tufted annual or perennial sedge to 25 cm high. Leaves mostly longer than stems, narrow to 2 mm wide. Flower-spike head-like or simple. Spikelets flattened to 25 mm long and 4 mm wide, with 6–25-flowers. Flowering  between March and September.
Fruit type:
Flat, golden brown fruit-head in clusters at terminal of stems.
Seed type:
Brown  oblong, triangular seed to 1 mm long and 0.2 mm wide, with a tuberculate surface and covered in a thin whitish transparent layer.
Embryo type:
Capitate.
Seed collecting:
Collect fruits by picking off the mature heads, those turning golden brown colour and come-off easily.
Seed cleaning:
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. 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.
Seed viability:
From one collection, the seed viability was high, at 100%.
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA57600 (2.1 g)9-May-2007RJB71705
Lake Eyre
1-Aug-2007100%-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.