Seeds of South Australia
Bolboschoenus caldwellii (Cyperaceae)
Salt Club-sedge
List of species for Bolboschoenus
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Seed collecting:
October to March
Herbarium regions:
Lake Eyre, Flinders Ranges, Eastern, Eyre Peninsula, Northern Lofty, Murray, Southern Lofty, South Eastern
NRM regions:
Adelaide and Mount Lofty Ranges, Eyre Peninsula, South Australian Arid Lands, South Australian Murray-Darling Basin, South East
IBRA regions
SUMMARY
Mount Gambier (SVP02)Southern Volcanic Plain
 Vulnerable   (IUCN: VU D2)   [(no records) L Farrington knows of]
Bridgewater (NCP01)Naracoorte Coastal Plain
 Vulnerable   (IUCN: VU D2)   [in Lake Frome]
Glenelg Plain (NCP02) 
 Vulnerable   (IUCN: VU D2)   [in Glenelg River NP]
Lucindale (NCP03) 
 Endangered   (IUCN: EN B2ab(i,ii,iii))   (Probable Decline)
Fleurieu (KAN02)Kanmantoo
 Rare   (IUCN: RA d(ii))   (Probable Decline)   [changed hydrology, needs flows]
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Near Threatened   [occurs in saline areas, needs flows]
Broughton (FLB02) 
 Least Concern
Southern Flinders (FLB04) 
 Rare   (IUCN: RA d(ii))
Northern Flinders (FLB05) 
 Vulnerable   (IUCN: VU D2)
Central Flinders (FLB06) 
 Rare   (IUCN: RA d(i,ii))   [copes with grazing]
St Vincent (EYB02)Eyre Yorke Block
 Least Concern
Eyre Hills (EYB03) 
 Rare   (IUCN: RA d(ii))   [likes salt]
Murray Mallee (MDD02)Murray Darling Depression
 Least Concern
Murray Lakes and Coorong (MDD03) 
 Least Concern
Murray Scroll Belt (RIV06)Riverina
 Least Concern
Curnamona (BHC06)Broken Hill Complex
 Rare   (IUCN: RA d(ii))
Warriner (SSD04)Simpson Strzelecki Dunefields
 Rare   (IUCN: RA d(ii))
Strzelecki Desert (SSD05) 
 Vulnerable   (IUCN: VU D2)
Oodnadatta (STP02)Stony Plains
 Near Threatened
Murnpeowie (STP03) 
 Near Threatened
Peake-Dennison Inlier (STP04) 
 Near Threatened
Witjira (STP06) 
 Near Threatened
Baltana (STP07) 
 Near Threatened
Sturt Stony Desert (CHC02)Channel Country
 Near Threatened
Diamantina-Eyre (CHC04) 
 Near Threatened
IBRA regions
DISPLAY ALL
Mount Gambier (SVP02)Southern Volcanic PlainVulnerable
  (IUCN: VU D2)   [(no records) L Farrington knows of]
3 of 4 subregionsNaracoorte Coastal PlainVulnerable
, Endangered
Fleurieu (KAN02)KanmantooRare
  (IUCN: RA d(ii))   (Probable Decline)   [changed hydrology, needs flows]
5 of 6 subregionsFlinders Lofty BlockLeast Concern
, Near Threatened
, Rare
, Vulnerable
2 of 5 subregionsEyre Yorke BlockLeast Concern
, Rare
2 of 6 subregionsMurray Darling DepressionLeast Concern
Murray Scroll Belt (RIV06)RiverinaLeast Concern
Curnamona (BHC06)Broken Hill ComplexRare
  (IUCN: RA d(ii))
2 of 4 subregionsSimpson Strzelecki DunefieldsRare
, Vulnerable
5 of 7 subregionsStony PlainsNear Threatened
2 of 4 subregionsChannel CountryNear Threatened
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 Bolboschoenus]
Name derivation:
Bolboschoenus from the Greek 'bolbos' meaning a bulb and 'Schoenus' a genus of Cyperaceae from which it was considered separable by the swellings on the stem. Caldwellii named after A. C. Caldwell, of Hamilton, for many years an enthusiastic collector and student of our indigenous flora and who did much to stimulate the writer's interest in New Zealand's plants.
Distribution:
Found in fresh or brackish water across the eastern side of South Australia. Also found in all other states.
Status:
Native. Common in South Australia. Rare in Northern Territory. Common in all the other states.
Plant description:
Rhizome creeping sedge to 90 cm high with hard ovoid tubers and three-sided stems. Leaves flat and grass-like.  Inflorescence umbel-like, with the 1-3 rays erect or spreading or reduced to 1 or 2 golden- or red-brown spikelets.
Fruit type:
Dense red-brown clusters of fruiting heads. 
Seed type:
Brown ovoid nut to 3 mm long and 2.5 mm wide, smooth, shiny and covered with a fine mesh-like surface.
Embryo type:
Capitate.
Seed collecting:
Collect whole heads that are brown, containing dark hard seeds.
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. 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 85%.
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA 
MSB
30100 (102.5 g)
30100 (102.5 g)
3011-Jan-2007RJB71148
Southern Lofty
1-Aug-200785%-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.