Seeds of South Australia
Isolepis australiensis (Cyperaceae)
Southern Club-sedge
List of species for Isolepis
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Seed collecting:
January to December
Herbarium regions:
North Western, Lake Eyre, Gairdner-Torrens, Flinders Ranges, Eastern, Eyre Peninsula, Murray, Yorke Peninsula, Southern Lofty, South Eastern
NRM regions:
Adelaide and Mount Lofty Ranges, Alinytjara Wilurara, Eyre Peninsula, Northern and Yorke, South Australian Arid Lands, South Australian Murray-Darling Basin, South East
IBRA regions
SUMMARY
Lucindale (NCP03)Naracoorte Coastal Plain
 Regionally Extinct   [possibly extinct]
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Data Deficient   [highly mobile; edge of range]
Broughton (FLB02) 
 Least Concern   [spread by water birds]
Olary Spur (FLB03) 
 Least Concern   [spread by water birds]
Southern Flinders (FLB04) 
 Least Concern   [spread by water birds]
Northern Flinders (FLB05) 
 Vulnerable   (IUCN: VU D2)   [localised; very tiny]
St Vincent (EYB02)Eyre Yorke Block
 Least Concern   [spread by water birds]
Eyre Hills (EYB03) 
 Rare   (IUCN: RA d(ii))
Eyre Mallee (EYB05) 
 Rare   (IUCN: RA d(ii))
Murray Mallee (MDD02)Murray Darling Depression
 Vulnerable   (IUCN: VU B2ab(i,ii,iii))   (Probable Decline)   [annual]
Braemer (MDD07) 
 Least Concern   [spread by water birds]
Murray Scroll Belt (RIV06)Riverina
 Vulnerable   (IUCN: VU B2ab(i,ii,iii))   (Probable Decline)   [annual]
Myall Plains (GAW01)Gawler
 Rare   (IUCN: RA d(ii))
Gawler Volcanics (GAW02) 
 Rare   (IUCN: RA d(ii))
Gawler Lakes (GAW03) 
 Rare   (IUCN: RA d(ii))
Arcoona Plateau (GAW04) 
 Rare   (IUCN: RA d(ii))
Torrens (GAW06) 
 Rare   (IUCN: RA d(i,ii))   [very tiny]
Roxby (GAW07) 
 Near Threatened   [very tiny]
Tallaringa (GVD05)Great Victoria Desert
 Rare   (IUCN: RA d(i,ii))   [very tiny]
Bimbowrie (BHC05)Broken Hill Complex
 Least Concern   [spread by water birds]
Curnamona (BHC06) 
 Least Concern   [spread by water birds]
Dieri (SSD03)Simpson Strzelecki Dunefields
 Rare   (IUCN: RA d(ii))   [very tiny]
Warriner (SSD04) 
 Data Deficient   [very tiny; record location imprecise]
Strzelecki Desert (SSD05) 
 Rare   (IUCN: RA d(ii))   [very tiny]
Oodnadatta (STP02)Stony Plains
 Rare   (IUCN: RA d(i,ii))   [very tiny]
Murnpeowie (STP03) 
 Rare   (IUCN: RA d(i,ii))   [very tiny]
Macumba (STP05) 
 Rare   (IUCN: RA d(i,ii))
Sturt Stony Desert (CHC02)Channel Country
 Rare   (IUCN: RA d(i,ii))   [very tiny]
Diamantina-Eyre (CHC04) 
 Least Concern   [very tiny]
Coongie (CHC06) 
 Least Concern   [very tiny]
Lake Pure (CHC07) 
 Rare   (IUCN: RA d(i,ii))   [very tiny]
Pedirka (FIN04)Finke
 Rare   (IUCN: RA d(i,ii))   [very tiny]
IBRA regions
DISPLAY ALL
Lucindale (NCP03)Naracoorte Coastal PlainRegionally Extinct
  [possibly extinct]
5 of 6 subregionsFlinders Lofty BlockLeast Concern
, Vulnerable
, Data Deficient
3 of 5 subregionsEyre Yorke BlockLeast Concern
, Rare
2 of 6 subregionsMurray Darling DepressionLeast Concern
, Vulnerable
Murray Scroll Belt (RIV06)RiverinaVulnerable
  (IUCN: VU B2ab(i,ii,iii))   (Probable Decline)   [annual]
6 of 8 subregionsGawlerNear Threatened
, Rare
Tallaringa (GVD05)Great Victoria DesertRare
  (IUCN: RA d(i,ii))   [very tiny]
2 of 4 subregionsBroken Hill ComplexLeast Concern
3 of 4 subregionsSimpson Strzelecki DunefieldsRare
, Data Deficient
3 of 7 subregionsStony PlainsRare
4 of 4 subregionsChannel CountryLeast Concern
, Rare
Pedirka (FIN04)FinkeRare
  (IUCN: RA d(i,ii))   [very tiny]
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 Isolepis]
Name derivation:
Isolepis from the Greek 'isos' meaning equal and 'lepis' meaning scale; referring to the glumes. Australiensis means of or from the south; referring to the distribution of the species in the southern part of Australia.
Distribution:
Found scattered across the eastern half of South Australia, growing in damp places especially near the edge of the water. Also found in all mainland states.
Status:
Native. Common in South Australia. Uncommon in Western Australia, Northern territory and Victoria. Common in the other states.
Plant description:
Small slender annual sedge with stems solitary or tufted. Leaves to 10 cm long, bract erect or spreading, mostly longer than the spikelets and to 10 mm long. Spikelets 1-4 but usually 2 or 3, pale or brownish, ovoid or oblong, angled, to 4 mm long, glumes rather spreading, mucronate, with a broad green keel, sides thin, hyaline, nerveless or each with one faint nerve. Flowers throughout the year.
Fruit type:
Few brown ovoid fruit-head in clusters at the end of stems.
Seed type:
Black ovoid-triangular seed to 0.5 mm long and 0.4 mm wide with a low and small pitted surface.
Embryo type:
Capitate.
Seed collecting:
Collect fruits either by picking off the mature heads, those turning brown and come-off easily or pull out the whole plant.
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. Be careful, as the seeds are very small. Seeds are black 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.
Seed viability:
From one collection, the seed viability was average, at 65%.
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA 
MSB
23900 (0.35 g)
23900 (0.35 g)
4-Apr-2007RJB71354
Eastern
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.
Germination table:
DateResultT0T50Pre-treatment | Germination medium | Incubator: Photoperiod / Thermoperiod
Jul-1773%720 dry heat 100°C oven for 10 min, 30% hydrogen peroxide for 20 min, water rinse, 500 mg/L gibberellic acid for 44 h;
1% agar;
Incubated under summer conditions
Jul-1763%1428 30% hydrogen peroxide for 20 min, water rinse, 500 mg/L gibberellic acid for 44 h;
1% agar;
Incubated under spring/autumn conditions
Jul-1750%748 30% hydrogen peroxide for 20 min, water rinse, 500 mg/L gibberellic acid for 44 h;
1% agar;
Incubated under summer conditions
Jul-1740%28NA 30% hydrogen peroxide for 20 min, water rinse, 500 mg/L gibberellic acid for 44 h;
1% agar;
Incubated under winter conditions
Jul-1737%14NA dry heat 100°C oven for 10 min, 30% hydrogen peroxide for 20 min, water rinse, 500 mg/L gibberellic acid for 44 h;
1% agar;
Incubated under winter conditions
Jul-1723%14NA dry heat 100°C oven for 10 min, 30% hydrogen peroxide for 20 min, water rinse, 500 mg/L gibberellic acid for 44 h;
1% agar;
Incubated under spring/autumn conditions
Result: Maximum percentage of germination observed.
T0: Number of days before first germinant observed.
T50: Number of days to achieve 50% germination.
Pre-treatment: The initial treatment that the seeds received prior to placement on germination media.
Germination medium: The substrate that seeds were placed on for the duration of the germination experiment.
Incubator conditions:
Photoperiod: The duration of light exposure that the seeds were subject to during a 24 hour period.
Thermoperiod: The constant or diurnal temperatures that seeds were subject to during a 24 hour period.
Winter conditions: 15°C 20 h (3am→11pm); 5°C 4 h (11pm→3am) / 10 h light (8am→6pm); 14 h dark (6pm→8am)
Spring/Autumn conditions: 22°C 12 h (8am→8pm); 10°C 12 h (8pm→8am) / 12 h light (8am→8pm); 12 h dark (8pm→8am)
Summer conditions: 30°C 14 h (6am→8pm); 15°C 10 h (8pm→6am) / 14 h light (6am→8pm); 10 h dark (8pm→6am)