Seeds of South Australia
Juncus holoschoenus (Juncaceae)
Joint-leaf Rush
List of species for Juncus
Click on an image to enlarge it
Seed collecting:
February to May
Herbarium regions:
Flinders Ranges, Eyre Peninsula, Northern Lofty, Murray, Southern Lofty, South Eastern
NRM regions:
Adelaide and Mount Lofty Ranges, Eyre Peninsula, Northern and Yorke, South Australian Arid Lands, South Australian Murray-Darling Basin, South East
IBRA regions
SUMMARY
Mount Gambier (SVP02)Southern Volcanic Plain
 Rare   (IUCN: RA d(i,ii))
Bridgewater (NCP01)Naracoorte Coastal Plain
 Rare   (IUCN: RA d(i,ii))
Glenelg Plain (NCP02) 
 Near Threatened
Lucindale (NCP03) 
 Rare   (IUCN: RA d(ii))
Fleurieu (KAN02)Kanmantoo
 Near Threatened   (Probable Decline)   [habitat degrading]
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Near Threatened   (Probable Decline)   [weeds/blackberry - threat]
Broughton (FLB02) 
 Endangered   (IUCN: EN A2ac; D)   (Definite Decline)
Olary Spur (FLB03) 
 Endangered   (IUCN: EN A2ac; D)   (Definite Decline)
Southern Flinders (FLB04) 
 Endangered   (IUCN: EN A2ac; D)   (Definite Decline)
Central Flinders (FLB06) 
 Endangered   (IUCN: EN B2ab(i,ii,iii))   (Probable Decline)   [far edge of range; spread by birds]
St Vincent (EYB02)Eyre Yorke Block
 Critically Endangered   (IUCN: CR D)   (Definite Decline)
Murray Mallee (MDD02)Murray Darling Depression
 Endangered   (IUCN: EN B2ab(i,ii,iii))   (Probable Decline)   [loss of habitat ]
Lowan Mallee (MDD04) 
 Rare   (IUCN: RA d(i,ii))   (Probable Decline)
Wimmera (MDD05) 
 Rare   (IUCN: RA d(i,ii))
IBRA regions
DISPLAY ALL
Mount Gambier (SVP02)Southern Volcanic PlainRare
  (IUCN: RA d(i,ii))
3 of 4 subregionsNaracoorte Coastal PlainNear Threatened
, Rare
Fleurieu (KAN02)KanmantooNear Threatened
  (Probable Decline)   [habitat degrading]
5 of 6 subregionsFlinders Lofty BlockNear Threatened
, Endangered
St Vincent (EYB02)Eyre Yorke BlockCritically Endangered
  (IUCN: CR D)   (Definite Decline)
3 of 6 subregionsMurray Darling DepressionRare
, Endangered
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 Juncus]
Name derivation:
Juncus from the Latin 'jungere' meaning to tie or bind; referring to the use of the rushes for weaving and basketry. Holoschoenus possibly from the Greek 'holos' meaning entirely and 'schoinos' meaning rush, reed; unsure of its reference to the species.
Distribution:
Found in the Flinders Ranges, Mount Lofty Ranges and the South-east in South Australia, growing in damp grassland and along the edge of water. Also found in Western Australia, Queensland, New South Wales, Victoria and Tasmania.
Status:
Native. Rare in South Australia. Rare in Queensland. Common in the other states.
Plant description:
Tufted or shortly rhizomatous perennial rush with greyish-green stems to 45 cm high and 3 mm diameter. Leaves cauline with hollow blade hollow, usually at least as long as the stem, terete or slightly compressed, to 4 mm wide. Inflorescence terminal in loose clusters with many light brown flowers with reddish tinged towards the apex. Flowering between December and March.
Fruit type:
Clusters of light brown to golden-brown, trigonous-ovoid capsules with numerous seeds.
Seed type:
Tiny orange ovoid seed to 0.5 mm long and 0.3 mm wide, with fine reticulated surface.
Embryo type:
Broad.
Seed collecting:
Collect fruits either by picking off the mature heads, those turning brown and come-off easily or break-off the whole spikes.
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. Be careful, as the seeds are very small. Seeds are brown and hard. 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 average, at 55%.
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA 
MSB
19500 (0.303 g)
19500 (0.303 g)
30-4015-Feb-2006DJD411
South Eastern
1-Aug-200655%-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.