Seeds of South Australia
Carex tereticaulis (Cyperaceae)
Rush Sedge
List of species for Carex
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Seed collecting:
April, November to February
Herbarium regions:
Flinders Ranges, Eyre Peninsula, Northern Lofty, Murray, Southern Lofty, South Eastern
NRM regions:
Adelaide and Mount Lofty Ranges, Eyre Peninsula, South Australian Arid Lands, South Australian Murray-Darling Basin, South East
IBRA regions
SUMMARY
Mount Gambier (SVP02)Southern Volcanic Plain
 Vulnerable   (IUCN: VU B2ab(i,ii,iii))   (Probable Decline)
Bridgewater (NCP01)Naracoorte Coastal Plain
 Data Deficient
Glenelg Plain (NCP02) 
 Rare   (IUCN: RA d(ii))
Lucindale (NCP03) 
 Vulnerable   (IUCN: VU B2ab(i,ii,iii))
Fleurieu (KAN02)Kanmantoo
 Least Concern   [tolerates grazing, disturbed areas]
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Least Concern   [tolerates grazing, disturbed areas]
Broughton (FLB02) 
 Rare   (IUCN: RA ab)   (Definite Decline)
Southern Flinders (FLB04) 
 Rare   (IUCN: RA ab)   (Definite Decline)
Northern Flinders (FLB05) 
 Vulnerable   (IUCN: VU D2)   [needs damp soil; restricted]
Central Flinders (FLB06) 
 Vulnerable   (IUCN: VU D2)   [needs damp soil; restricted]
Eyre Hills (EYB03)Eyre Yorke Block
 Vulnerable   (IUCN: VU B2ab(i,ii,iii))   (Probable Decline)
Murray Mallee (MDD02)Murray Darling Depression
 Rare   (IUCN: RA d(i,ii))
Lowan Mallee (MDD04) 
 Rare   (IUCN: RA d(i,ii))   (Probable Decline)   [edge of range]
Wimmera (MDD05) 
 Vulnerable   (IUCN: VU B2ab(i,ii,iii))   (Probable Decline)
IBRA regions
DISPLAY ALL
Mount Gambier (SVP02)Southern Volcanic PlainVulnerable
  (IUCN: VU B2ab(i,ii,iii))   (Probable Decline)
3 of 4 subregionsNaracoorte Coastal PlainRare
, Vulnerable
, Data Deficient
Fleurieu (KAN02)KanmantooLeast Concern
  [tolerates grazing, disturbed areas]
5 of 6 subregionsFlinders Lofty BlockLeast Concern
, Rare
, Vulnerable
Eyre Hills (EYB03)Eyre Yorke BlockVulnerable
  (IUCN: VU B2ab(i,ii,iii))   (Probable Decline)
3 of 6 subregionsMurray Darling DepressionRare
, Vulnerable
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 Carex]
Name derivation:
Carex is the classical Latin name for sedge, perhaps from 'carere' meaning to be absent, as the upper spikes are staminate (male) and do not produce seeds. May have been used by Virgil for plants in this genus and derives from ancient Greek 'keiro' meaning to cut; referring to the sharp edge of leaf margins.
Distribution:
Found on southern Eyre Peninsula, Flinders Ranges, Mount Lofty Ranges and the South-east in South Australia, growing in damp ground, especially if subject to occasional flooding. Also found in Western Australia, New South Wales, Victoria and Tasmania.
Status:
Native. Common in South Australia. Rare in Western Australia. Common in the other states.
Plant description:
Densely tufted sedge in clumps to 1 m diameter and to 1 m high with stems terete or obtusely triangular near the top only, smooth, finely striate. Leaves often rudimentary or reduced to their sheaths, sometimes laminae well-developed but these are relatively inconspicuous among the numerous culms. Flower-spike a long narrow spike-like panicle mostly less than 10 cm long, the lowest bracts usually inconspicuous, glumes somewhat obtuse, the female glumes with a conspicuous wide hyaline border. Flowering between August and April.
Fruit type:
Brown, scattered clusters of heads along a spike, each containing numerous individual fruit.
Seed type:
Brown ovoid seed to 3 mm long and 2.5 mm wide, covered by a striated papery layer with serrated edge.
Embryo type:
Capitate.
Seed collecting:
Collect fruits either by running your hands along the heads, mature seeds will come-off easily or cut whole heads that are brown, containing dark hard seeds.
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.
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA 
MSB
14954
14954
625-Feb-2004MKJ 26
Southern Lofty
1-Sep-200490%+5°C, -18°C
BGA34226529-Apr-2004MKJ 28
Southern Lofty
1-Sep-200495%+5°C, -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
April 201092%14d14d Stored at -18°C (5years). Leaching in warm water with 5 drops of Tween (48hrs)
1% w/v agar
Incubated under spring/autumn conditions
August 200690%18d18d Stored at -18°C (1year). Leaching in warm water with 5 drops of Tween (48hrs)
Wet filter paper placed over wettex sponge. Irrigated with RO water.
Incubated under spring/autumn conditions
July 200484%15d21d Seed sterilised with 20% Hydrogen Peroxide (10min). Rinsed with sterile water.
Wet filter paper placed over wettex sponge. Irrigated with RO water.
10/14 dark/light  /  10°C/20°C
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)