Seeds of South Australia
Triglochin hexagona (Juncaginaceae)
Six-point Arrowgrass
List of species for Triglochin
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Seed collecting:
January to December
Herbarium regions:
Lake Eyre, Flinders Ranges, Eyre Peninsula, Northern Lofty, Murray
NRM regions:
Eyre Peninsula, Northern and Yorke, South Australian Arid Lands, South Australian Murray-Darling Basin
IBRA regions
Northern Flinders (FLB05)Flinders Lofty Block
 Rare   (IUCN: RA d(ii))   [(no records) comes up after floods; most records are under hexagonum]
Murray Mallee (MDD02)Murray Darling Depression
 Rare   (IUCN: RA d(i,ii))   [checked H Vonow; name has changed therefore lack of records]
Murray Lakes and Coorong (MDD03) 
 Rare   (IUCN: RA d(i,ii))   [not much known, taxo changes]
Murray Scroll Belt (RIV06)Riverina
 Rare   (IUCN: RA d(i,ii))   [checked H Vonow; name has changed therefore lack of records]
Gawler Lakes (GAW03)Gawler
 Rare   (IUCN: RA d(ii))
Dieri (SSD03)Simpson Strzelecki Dunefields
 Near Threatened   [comes up after floods; most records are under hexagonum]
Murnpeowie (STP03)Stony Plains
 Rare   (IUCN: RA d(ii))   [(no records) comes up after floods; most records are under hexagonum]
Baltana (STP07) 
 Near Threatened   [(no records) comes up after floods; most records are under hexagonum]
Coongie (CHC06)Channel Country
 Least Concern   [(no records) comes up after floods; most records are under hexagonum]
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 Triglochin]
Name derivation:
Triglochin from the Greek 'treis' meaning three and 'glochis' meaning a point; referring to its three-sided carpels. Hexagona from the Greek 'hex' meaning six and 'gonia' meaning angle; referring to its six angled fruit.
Distribution:
Found in the eastern side of South Australia, north of the Murray River, growing in shallow seasonal or ephemeral wetlands and in slightly saline areas, in sandy to clayey soils. Also found in all mainland states.
Status:
Native. Uncommon in South Australia. Rare in Victoria. Uncommon in Queensland and New South Wales. Common in the other states.
Plant description:
Slender weak annual herb to 7.5 cm high. Leaves flat and thread-like, to 7.5 cm long, usually equal to or exceeding the inflorescence. Inflorescence an erect or ascending spike to 5.2 cm long fruiting part at the top to 1.3 cm long with 10-25 fruits. Flowering in response to rainfall.
Fruit type:
Straw-coloured angular-oblong fruit to 1.2 mm long and 1 mm wide, with six angles and six seed segments (carpels), 3 fertile alternating with 3 undeveloped sterile ones.
Seed type:
Straw-coloured wedge-shaped seed to 1.2 mm long and 1 mm wide, with 4 lateral wings.
Embryo type:
Linear.
Seed collecting:
Collect mature fruits either by breaking off individual spikes or by removing plants that are drying off with fruits that are straw-colour and seed segments coming apart easily.
Seed cleaning:
Place the fruit spikes in a tray and leave to dry for 1 to 2 weeks. Then rub the dried fruit spikes 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
BGA 
MSB
7800 (1.15 g)
7800 (1.15 g)
50+3-Apr-2007RJB71294
Eastern
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.
Germination table:
DateResultT0T50Pre-treatment | Germination medium | Incubator: Photoperiod / Thermoperiod
Jul-17100%77 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
Jul-17100%77 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-1787%714 30% hydrogen peroxide for 20 min, water rinse, 500 mg/L gibberellic acid for 44 h;
1% agar;
Incubated under winter conditions
Jul-1773%728 30% hydrogen peroxide for 20 min, water rinse, 500 mg/L gibberellic acid for 44 h;
1% agar;
Incubated under summer conditions
Jul-1770%714 30% hydrogen peroxide for 20 min, water rinse, 500 mg/L gibberellic acid for 44 h;
1% agar;
Incubated under spring/autumn conditions
Jul-1770%728 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
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)