Seeds of South Australia
Triglochin striata (Juncaginaceae)
Streaked Arrowgrass
List of species for Triglochin
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Seed collecting:
August to May
Herbarium regions:
Lake Eyre, Flinders Ranges, Eyre Peninsula, Northern Lofty, Murray, Yorke Peninsula, Southern Lofty, Kangaroo Island, South Eastern
NRM regions:
Adelaide and Mount Lofty Ranges, Eyre Peninsula, Kangaroo Island, Northern and Yorke, South Australian Murray-Darling Basin, South East
IBRA regions
Bridgewater (NCP01)Naracoorte Coastal Plain
 Least Concern
Lucindale (NCP03) 
 Least Concern
Tintinara (NCP04) 
 Near Threatened
Kangaroo Island (KAN01)Kanmantoo
 Rare   (IUCN: RA d(ii))
Fleurieu (KAN02) 
 Least Concern
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Near Threatened   [undercollected]
Broughton (FLB02) 
 Least Concern
Olary Spur (FLB03) 
 Rare   (IUCN: RA ab)   (Definite Decline)   [most habitat gone]
Southern Flinders (FLB04) 
 Rare   (IUCN: RA ab)   (Definite Decline)   [most habitat gone]
Southern Yorke (EYB01)Eyre Yorke Block
 Rare   (IUCN: RA ab)   (Definite Decline)
St Vincent (EYB02) 
 Rare   (IUCN: RA ab)   (Definite Decline)
Eyre Hills (EYB03) 
 Least Concern   [records not databased]
Talia (EYB04) 
 Least Concern   [records not databased]
Murray Mallee (MDD02)Murray Darling Depression
 Least Concern
Murray Lakes and Coorong (MDD03) 
 Least Concern
Lowan Mallee (MDD04) 
 Rare   (IUCN: RA d(i,ii))   (Probable Decline)
Braemer (MDD07) 
 Rare   (IUCN: RA ab)   (Definite Decline)   [most habitat gone]
Murray Scroll Belt (RIV06)Riverina
 Least Concern   [checked H Vonow; name has changed therefore lack of records; tolerates salt]
Strzelecki Desert (SSD05)Simpson Strzelecki Dunefields
 Rare   (IUCN: RA d(i,ii))   [(no records), records under T striatum; limited habitat, outlier]
IBRA regions
3 of 4 subregionsNaracoorte Coastal PlainLeast Concern
, Near Threatened
2 of 2 subregionsKanmantooLeast Concern
, Rare
4 of 6 subregionsFlinders Lofty BlockLeast Concern
, Near Threatened
, Rare
4 of 5 subregionsEyre Yorke BlockLeast Concern
, Rare
4 of 6 subregionsMurray Darling DepressionLeast Concern
, Rare
Murray Scroll Belt (RIV06)RiverinaLeast Concern
  [checked H Vonow; name has changed therefore lack of records; tolerates salt]
Strzelecki Desert (SSD05)Simpson Strzelecki DunefieldsRare
  (IUCN: RA d(i,ii))   [(no records), records under T striatum; limited habitat, outlier]
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. Striata from Latin meaning striped; referring to the streak on the back of the fertile carpels.
Found in the southern part of South Australia, growing mainly along the coast in periodically inundated salt marshes, swamps, lakes, river edges and mangroves in salt and fresh water. Also found in all states except in the Northern Territory (and New Zealand, the Americas and South Africa).
Native. Common in South Australia. Common in the other states.
Plant description:
Slender rhizomatous perennial herb to 37 cm high. Leaves forming tufts spaced along the rhizome, either terete or flat and strap-like, to 300 mm long and 3 mm wide, sheathed at the base with an obvious ligule at the top of the sheath to 5 mm long. Inflorescence an erect spike to 25 cm long, fruiting part at the top to 18 cm long with 20–200 fruits.
Fruit type:
Straw-coloured almost globular fruit to 2 mm long, on stalk to 3 mm long with six seed segments (carpels), 3 fertile alternating with 3 undeveloped sterile ones.
Seed type:
Straw-coloured wedge-shaped seed to 2 mm long and 1.5 mm wide, with 3-ridged dorsally when dry, sterile seed segments remaining attached to the stalk when fertile ones have fallen.
Embryo type:
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 two collections, the seed viability were average to high, ranging form 80% to 90%.
Seeds stored:
LocationNo. of seeds
(weight grams)
of plants
Collection number
Collection location
% ViabilityStorage
15700 (5.193 g)
15,500 (5.18 g)
>4019-Jan-2005DJD 98
South Eastern
BGA7400 (2.22 g)16-Dec-2006RJB70657
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.