Seeds of South Australia
Triglochin mucronata (Juncaginaceae)
Prickly Arrowgrass
List of species for Triglochin
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Seed collecting:
August to October
Herbarium regions:
Eyre Peninsula, 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
 Near Threatened
Lucindale (NCP03) 
 Rare   (IUCN: RA d(i,ii))
Tintinara (NCP04) 
 Rare   (IUCN: RA d(i,ii))   [Gum Lagoon]
Kangaroo Island (KAN01)Kanmantoo
 Near Threatened   [undercollected; grows in semi-saline areas]
Fleurieu (KAN02) 
 Vulnerable   (IUCN: VU D2)   [(no records) limited habitat]
Southern Yorke (EYB01)Eyre Yorke Block
 Least Concern   (Probable Decline)   [tolerates salt]
St Vincent (EYB02) 
 Least Concern   (Probable Decline)   [tolerates salt]
Eyre Hills (EYB03) 
 Least Concern   [records not databased]
Talia (EYB04) 
 Least Concern   [records not databased]
Eyre Mallee (EYB05) 
 Least Concern   [records not databased]
Murray Lakes and Coorong (MDD03)Murray Darling Depression
 Rare   (IUCN: RA d(i,ii))
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. Mucronata from the Latin 'mucronatus' meaning mucronate, with a hard sharp-pointed tip; referring to its carpels with spreading tips. 
Found in the southern part of South Australia, from the Eyre Peninsula to the lower South-east, growing on damp saline soils in herbfields of salt-flats and coastal saltmarshes. Also found in Western Australia, Victoria and Tasmania.
Native. Common in South Australia. Very rare in Tasmania. Rare in Victoria. Common in Western Australia.
Plant description:
Small annual herb to 10 cm high. Leaves flat and thread-like 5 cm long, usually shorter than the inflorescence. Inflorescence an erect, ascending or spreading spike to 10 cm long, fruiting part at the top to 1.5 cm long, with 3–15 fruits. Flowering between July to September.
Fruit type:
Straw-coloured (tinged of red) inverted pyramid-shaped fruit 2.5 mm long and 2.2 mm wide (excluding spreading points), stalkless or very short stalk, with six seed segments (carpels), 3 fertile alternating with 3 undeveloped sterile ones.
Seed type:
Straw-coloured (tinged of red) wedge-shaped seed to 2.3 mm long and 1.3 mm wide, truncate with 1 median spreading point at top end.
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 one collection, the seed viability was high, at 95%.
Seeds stored:
LocationNo. of seeds
(weight grams)
of plants
Collection number
Collection location
% ViabilityStorage
8000 (7.35 g)
8000 (7.35 g)
South Eastern
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.