Seeds of South Australia
Baumea juncea (Cyperaceae)
Blue Twig-rush
List of species for Baumea
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Seed collecting:
December to June
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 Arid Lands, South Australian Murray-Darling Basin, South East
IBRA regions
Mount Gambier (SVP02)Southern Volcanic Plain
 Least Concern
Bridgewater (NCP01)Naracoorte Coastal Plain
 Least Concern
Glenelg Plain (NCP02) 
 Least Concern
Lucindale (NCP03) 
 Least Concern
Tintinara (NCP04) 
 Least Concern
Kangaroo Island (KAN01)Kanmantoo
 Least Concern   [tolerates salinity]
Fleurieu (KAN02) 
 Least Concern   [tolerates salinity]
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Least Concern   [tolerates salinity]
Broughton (FLB02) 
 Least Concern   (Probable Decline)
Southern Flinders (FLB04) 
 Least Concern   (Probable Decline)
Southern Yorke (EYB01)Eyre Yorke Block
 Least Concern   (Probable Decline)
St Vincent (EYB02) 
 Rare   (IUCN: RA ab)   (Definite Decline)
Eyre Hills (EYB03) 
 Least Concern
Talia (EYB04) 
 Rare   (IUCN: RA d(ii))   [roadsides, swamps]
Eyre Mallee (EYB05) 
 Rare   (IUCN: RA d(ii))   [roadsides, swamps]
Murray Mallee (MDD02)Murray Darling Depression
 Near Threatened   [edge of range]
Murray Lakes and Coorong (MDD03) 
 Least Concern
Lowan Mallee (MDD04) 
 Least Concern
Wimmera (MDD05) 
 Near Threatened   [edge of range]
Myall Plains (GAW01)Gawler
 Vulnerable   (IUCN: VU B2ab(i,ii,iii))   (Probable Decline)   [roadsides, swamps]
Warriner (SSD04)Simpson Strzelecki Dunefields
 Vulnerable   (IUCN: VU D2)   [in mound springs; needs good quality water]
Murnpeowie (STP03)Stony Plains
 Vulnerable   (IUCN: VU D2)   [in mound springs; needs good quality water]
Peake-Dennison Inlier (STP04) 
 Vulnerable   (IUCN: VU D2)   [in mound springs; needs good quality water]
Baltana (STP07) 
 Vulnerable   (IUCN: VU D2)   [in mound springs; needs good quality water]
IBRA regions
Mount Gambier (SVP02)Southern Volcanic PlainLeast Concern
4 of 4 subregionsNaracoorte Coastal PlainLeast Concern
2 of 2 subregionsKanmantooLeast Concern
3 of 6 subregionsFlinders Lofty BlockLeast Concern
5 of 5 subregionsEyre Yorke BlockLeast Concern
, Rare
4 of 6 subregionsMurray Darling DepressionLeast Concern
, Near Threatened
Myall Plains (GAW01)GawlerVulnerable
  (IUCN: VU B2ab(i,ii,iii))   (Probable Decline)   [roadsides, swamps]
Warriner (SSD04)Simpson Strzelecki DunefieldsVulnerable
  (IUCN: VU D2)   [in mound springs; needs good quality water]
3 of 7 subregionsStony PlainsVulnerable
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 Baumea]
Name derivation:
Baumea named after Antoine Baume (1728–1804), a French chemist and inventor. Juncea from the Latin 'juncus' meaning rush-like, alluding to its appearance and habit.
Found in the southern part of South Australia, south of Port Augusta, with isolated occurrences in natural springs further north. Grows mostly in brackish or saline swamps, on sandy soils. Also found in Western Australia, Queensland, New South Wales, Victoria and Tasmania.
Native. Common in South Australia. Common in the others States.
Plant description:
Slender perennial sedge with smooth, terete, stems to 100 cm high and 1 mm thick and  2- or 3-noded. Leaves all reduced to mucronate sheaths. Flower in small panicle; spike-like to 8 cm long with few, reddish-brown, densely crowded spikelets. Flowering September to April.
Fruit type:
Short golden brown heads at the tip of the stem.
Seed type:
Reddish-black elliptical nut to 4mm long and 3mm wide, with a pitted surface.
Embryo type:
Seed collecting:
Collect whole fruiting heads that are brown, containing dark hard seeds. Not all heads will contain 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 germination:
This species is generally difficult to germinate, it has morphophysiological dormancy and complex germination requirements.