Seeds of South Australia
Tricostularia pauciflora (Cyperaceae)
Needle Bog-sedge
List of species for Tricostularia
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Seed collecting:
November to March
Herbarium regions:
Southern Lofty, South Eastern
NRM regions:
Adelaide and Mount Lofty Ranges, South East
IBRA regions
Lucindale (NCP03)Naracoorte Coastal Plain
 Endangered   (IUCN: EN B2ab(i,ii,iii))   (Probable Decline)
Fleurieu (KAN02)Kanmantoo
 Critically Endangered   (IUCN: CR B2ab(i,ii,iii); D)   (Probable Decline)   [doesn't tolerate disturbance; highly localised; 1 location; spraying/slashing - threats]
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 Tricostularia]
Name derivation:
Tricostularia from the Latin 'tres' meaning three and 'costula' meaning a little rib; referring to the 3-ribbed nut. Pauciflora from the Latin 'paucus' meaning few and 'florus' meaning flower; referring to the paucity of flowering.
Found in the Fleurieu Peninsula and in the lower South-east in South Australia, growing in damp heath particularly in low lying swales and depressions with damp sands that would saturate in winter. Also found in New South Wales, Victoria and Tasmania.
Native. Rare in South Australia. Rare in Tasmania. Common in the other states.
Plant description:
Small tufted perennial sedge to 50 cm high yellow-green, wiry terete stems emerging from a basal clump. Flowers solitary or 2 or 3 in a terminal cluster. Flowering between December and February.
Fruit type:
Short red-brown spike at terminal of stems. 
Seed type:
Three-sided dark brown ovoid seed to 2.5 mm long and 1.5 mm wide with scattered hairs on the surface.
Embryo type:
Seed collecting:
Collect heads that are fat, turning brown and containing 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.
Seed viability:
From two collections, the seed viability were average to high, ranging from 70% to 100%.
Seeds stored:
LocationNo. of seeds
(weight grams)
of plants
Collection number
Collection location
% ViabilityStorage
BGA215 (0.48 g)611-Dec-2009Comaum NFR
South Eastern
BGA480 (0.8 g)1018-Nov-2009TST885
Southern Lofty
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-160%NANA seed coat nicked with scalpel, 500 mg/L gibberellic acid + 10% smoke water 72 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)