Seeds of South Australia
Baumea articulata (Cyperaceae)
Jointed Twig-sedge
List of species for Baumea
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Seed collecting:
February to May
Herbarium regions:
Flinders Ranges, Murray, Southern Lofty, South Eastern
NRM regions:
Adelaide and Mount Lofty Ranges, South Australian Arid Lands, South Australian Murray-Darling Basin, South East
IBRA regions
Mount Gambier (SVP02)Southern Volcanic Plain
 Rare   (IUCN: RA d(i,ii))
Bridgewater (NCP01)Naracoorte Coastal Plain
 Rare   (IUCN: RA d(i,ii))   (Probable Decline)
Glenelg Plain (NCP02) 
 Rare   (IUCN: RA d(i,ii))
Lucindale (NCP03) 
 Vulnerable   (IUCN: VU B2ab(i,ii,iii); D2)   (Probable Decline)   [very restricted]
Fleurieu (KAN02)Kanmantoo
 Rare   (IUCN: RA d(ii))   [limited habitat; likes fresh water]
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Rare   (IUCN: RA d(ii))   [declining naturally but also planted in wetlands]
Central Flinders (FLB06) 
 Vulnerable   (IUCN: VU D2)   [northern limit; highly localised; climate sensitive]
Murray Mallee (MDD02)Murray Darling Depression
 Rare   (IUCN: RA d(i,ii))   [edge of range; often planted]
Murray Lakes and Coorong (MDD03) 
 Rare   (IUCN: RA d(ii))
Wimmera (MDD05) 
 Vulnerable   (IUCN: VU B2ab(i,ii,iii); D2)   (Probable Decline)
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. Articulata  meaning to have joints (septate).
Distribution:
Found in standing water of lagoons, deeper swamps and streams, mainly in the Mount Lofty Ranges and the lower South-east in South Australia, with isolated occurrence in the Flinders Ranges. Also found in Western Australia, Queensland, New South Wales, Victoria and Tasmania.
Status:
Native. Common in South Australia. Common in other States.
Plant description:
Perennial sedge with cylindrical stems to 2m high; hollow distinct transverse partitions (septa). Leaves basal, long, like the stems but with the transverse partitions very prominent; the tips tapering and rather pungent;;lowest bract similar but short. Flower in loose panicle to 40cm long, drooping with numerous brown spikelets.
Fruit type:
Large brown drooping heads.
Seed type:
Brown ovoid nut to 3mm long and 2mm wide with 3 vertical ridges arising from the base.
Embryo type:
Capitate.
Seed collecting:
Collect whole heads that are brown, containing dark hard seeds. Not all heads will contain seeds.
Seed cleaning:
Place the spike in a tray and leave to dry for one to two weeks. Then rub the 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 available.
Seed viability:
From two collections, the seed viability was high, ranging from 90% to 95%.
Seed germination:
This species is generally difficult to germinate, it has morphophysiological dormancy and complex germination requirements.
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA 
MSB
11500 (17.1 g)
11500 (17.1 g)
50+22-Mar-2006DJD436
Southern Lofty
28-Jul-200690%-18°C
BGA20000 (30.93 g)28-Feb-2007RJB71586
Southern Lofty
1-Aug-200795%-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.