Seeds of South Australia
Triglochin nana (Juncaginaceae)
Dwarf Arrowgrass
List of species for Triglochin
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Seed collecting:
August to November
Herbarium regions:
North Western, Lake Eyre, Nullarbor, Gairdner-Torrens, Flinders Ranges, Eastern, Eyre Peninsula, Northern Lofty, Murray, Yorke Peninsula, Southern Lofty, Kangaroo Island, South Eastern
NRM regions:
Adelaide and Mount Lofty Ranges, Alinytjara Wilurara, Eyre Peninsula, Kangaroo Island, Northern and Yorke, South Australian Arid Lands, South Australian Murray-Darling Basin, South East
IBRA regions
SUMMARY
Kangaroo Island (KAN01)Kanmantoo
 Rare   (IUCN: RA d(ii))   [undercollected; previously T nanum & centrocarpum; likes brackish areas]
Fleurieu (KAN02) 
 Near Threatened
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Near Threatened   [(no records)]
Broughton (FLB02) 
 Endangered   (IUCN: EN A2ac)   (Definite Decline)
Olary Spur (FLB03) 
 Endangered   (IUCN: EN A2ac)   (Definite Decline)   [could be extinct]
Southern Flinders (FLB04) 
 Endangered   (IUCN: EN A2ac)   (Definite Decline)
Northern Flinders (FLB05) 
 Rare   (IUCN: RA d(i,ii))   [(no records) undercollected; ephemeral]
Southern Yorke (EYB01)Eyre Yorke Block
 Least Concern   (Probable Decline)
St Vincent (EYB02) 
 Endangered   (IUCN: EN A2ac)   (Definite Decline)   [could be extinct, need survey work, DD]
Eyre Hills (EYB03) 
 Data Deficient   [records not databased]
Torrens (GAW06)Gawler
 Least Concern   [(no records) undercollected; ephemeral]
Roxby (GAW07) 
 Least Concern   [(no records) undercollected; ephemeral]
Commonwealth Hill (GAW08) 
 Least Concern   [(no records) undercollected; ephemeral]
Kintore (GVD04)Great Victoria Desert
 Least Concern   [undercollected; ephemeral]
Yellabinna (GVD06) 
 Data Deficient   [records not databased]
Warriner (SSD04)Simpson Strzelecki Dunefields
 Least Concern   [(no records) undercollected; ephemeral]
Murnpeowie (STP03)Stony Plains
 Least Concern   [(no records) undercollected; ephemeral]
Witjira (STP06) 
 Rare   (IUCN: RA d(ii))   [marginal]
Mann-Musgrave Block (CER01)Central Ranges
 Least Concern   [(no records) undercollected; ephemeral]
Watarru (CER02) 
 Least Concern   [(no records) undercollected; ephemeral]
Tieyon (FIN03)Finke
 Least Concern   [undercollected; ephemeral]
IBRA regions
DISPLAY ALL
2 of 2 subregionsKanmantooNear Threatened
, Rare
5 of 6 subregionsFlinders Lofty BlockNear Threatened
, Rare
, Endangered
3 of 5 subregionsEyre Yorke BlockLeast Concern
, Endangered
, Data Deficient
3 of 8 subregionsGawlerLeast Concern
2 of 4 subregionsGreat Victoria DesertLeast Concern
, Data Deficient
Warriner (SSD04)Simpson Strzelecki DunefieldsLeast Concern
  [(no records) undercollected; ephemeral]
2 of 7 subregionsStony PlainsLeast Concern
, Rare
2 of 3 subregionsCentral RangesLeast Concern
Tieyon (FIN03)FinkeLeast Concern
  [undercollected; ephemeral]
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. Nana from the Latin 'nanus' meaning dwarf; referring to its small stature.
Distribution:
Found across South Australia, growing in edge of claypans, within intermittent watercourses and run-on areas, edge of salt lakes and Chenopod-rich plains and shallow seasonal or ephemeral wetlands. Also found in Western Australia, Northern Territory, New South Wales and Victoria.
Status:
Native. Common in South Australia. Uncommon in New South Wales. 
Plant description:
Slender annual herb, to 12 cm high. Leaves flat and thread-like, to 6 cm long, shorter than the inflorescence. Inflorescence an erect or ascending spike to 5.5 cm long, fruiting part at the top to 3 cm long, with 3–24 fruits. Flowering July to October.
Fruit type:
Reddish-green almost linear but tapering to the summit fruit to 6 mm long and 1.2 mm wide just above base, on a long stalk  with six seed segments (carpels), 3 fertile alternating with 3 undeveloped sterile ones.
Seed type:
Reddish-green narrow wedge-shaped seed to 6 mm long and 0.5 mm wide, with 2 short, downwards-pointing spurs at the base.
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 reddish-green 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.
Germination table:
DateResultT0T50Pre-treatment | Germination medium | Incubator: Photoperiod / Thermoperiod
Jul-1783%77 30% hydrogen peroxide for 20 min, water rinse, 500 mg/L gibberellic acid for 44 h;
1% agar;
Incubated under winter conditions
Jul-1770%77 30% hydrogen peroxide for 20 min, water rinse, 500 mg/L gibberellic acid for 44 h;
1% agar;
Incubated under summer conditions
Jul-1743%7NA 30% hydrogen peroxide for 20 min, water rinse, 500 mg/L gibberellic acid for 44 h;
1% agar;
Incubated under spring/autumn conditions
Jul-1717%7NA 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-1713%7NA 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-176%7NA 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)